PAST BOARD ELEMENTS IN PIPE
INSTRUCTIONS: Familiarize the following Past
Board Elements in PIPE.
A type of condenser combines the functions of a condenser and
cooling tower is called
A. air-cooled condenser
C. ground-cooling condenser
B. water-cooled condenser
D. evaporative condenser
Answer: D
An expansion valve with a fluid-changed remote bulb that
maintains a constant degree of superheat in evaporator is called
A. thermostatic expansion valve C. automatic expansion valve
B. capillary tube
D. float valve
Answer: A
A refrigeration system ideally suited for use in air-craft
because it is light in weight and requires less space is called A.
mechanical vapor-compression C. air cycle
B. steam-jet
D. vapor absorption
Answer: C
Refrigerant with chemical formula CHCIF2 is designated by:
A. R134a
C. R12
B. R11
D. R22
Answer: D
Refrigerant with chemical formula CF3CH2F is designated
A. R134a
C. R12
B. R11
D. R22
Answer: A
Which refrigerant does not belong to the group?
A. ammonia
C. proprane
B. methane
D. Isobutane
Answer: A
Carbone dioxide refrigerant is designated by
A. R717
C. R744
B. R600
D . R718
Answer: C
Piping , fittings and valves materials found suitable for use in
ammonia refrigerant are manufactured from
A. Copper
C. Aluminium
B. Iron and Steel
D. Brass
Answer: B
Which statement is correct with water-cooled shell and tube type
of condenser?
A. Refrigerant condensing inside tubes and flowing in the shell B.
Water flowing through passes inside tubes and the refrigerant
condensing in the shell
C. Both refrigerant and water flowing through passes inside
tubes and refrigerant condensing
D. A, B and C are correct
Answer: B
In a vapor absorption refrigeration system utilizing ammonia as
refrigerant and the absorbent is.
A. Water
C. Carbon dioxide
B. Lithium Bromined
D. Air
Answer: A
The most common secondary refrigerant medium used in indirect
refrigeration system such as in industrial ice plant and cold
storages.
A. Hydrocarbon
C. Carbon dioxide
B. Air
D. Brine
Answer: D
A constant restriction expansion device in refrigeration
system which is merely a long tube with narrow bone is
called
A. Thermostatic expansion valve
C. Automatic
expansion valve
B. Capillary tube
D. Float valve
Answer: B
Mixtures of refrigerants but which behave like pure substance
are called
A. isomers
C. hydrocarbons
B. azeotropes
D. CFC
Answer: B
In refrigeration compressor that has an electric motor and a
compressor built into an integral housing is commonly called: A.
hermetic compressor
C. open type compressor
B. combined compressor
D. package compressor
Answer: A
Compounds with same chemical formula but different molecular
structure(such R134 & R 134a) are called
A. brominated
C. hydrocarbons
B. azeotropes
D. isomers
Answer: D
Which of the following refrigerants does not belong to the
group?
A. Carbon dioxide
C. Ammonia
B. Water Answer:
D. Isobutane
D
An expansion valve used for a flooded type of evaporator in a
refrigeration system is called
A. thermostatic expansion valve C. automatic expansion valve
B. capillary tube
D. float valve
Answer: D
An atom in the refrigerant molecule considered responsible for
the depletion ozone layer in upper atmosphere ( stratosphere)
A. Cl atom
C. H atom/s
B. F-atom
D. C atom
Answer: A
A vapour compression system used for production of low
temperatures which a series of refrigerants with progressively
lower boiling points, are used in series of single-stage units is
called
A. multipressure system
C. cascade system
B. single-stage system
D. series system
Answer: C
Which statement is correct on the effect of liquid subcooling in a
vapor compression system?
A. subcooling both increases flashing of the liquid during
expansion and the refrigerating effect
B. subcooling increases flashing of the liquid during expansion
and increases the refrigerating effect
C. subcooling both decreases flashing of the liquid expansion
and the refrigerating effect
D. subcooling decreases flashing of the liquid during expansion
and increases the refrigerating effect
Answer: D
Which statement is correct on the effect of suction vapor
superheating in a vapor compression system?
A. superheating both increases specific compressor work and the
refrigerating effect
B. superheating both decreases specific compressor work and
the refrigerating effect
C. superheating increases specific compressor work and
decreases the refrigerating effect
D. superheating decrease specific compressor work and
increases the refrigerating effect
Answer: A
Which statement is correct on the effect of increasing
condensing pressure in a vapor compression system A.
increasing condensing pressure both increases specific
compressor work and the refrigerating effect
B. increasing condensing pressure both decrease specific
compressor work and the refrigerating effect
PAST BOARD ELEMENTS IN PIPE
C. increasing condensing pressure increases specific compressor
work and decreases the refrigerating effect
D. increasing condensing pressure decrease specific compressor
work and increases the refrigerating effect
Answer: C
Freezing method utilizes the combined effects of low
temperature and high air velocity to produce a high rate of heat
transfer from product is called
A. indirect contact freezing
C. immersion freezing
B. blast freezing
D. spray freezing
Answer: B
A component installed a refrigeration system to ensure that no
liquid enters the compressor and subcooled the liquid from
condenser to prevent bubbles of vapor from impending the flow
of refrigerant through expansion valve is called
A. liquid-to-suction heat exchanger C. subcooler
B. flash chamber
D. drier
Answer: A
Refrigerant used in steam-jet refrigeration is:
A. ammonia
C. carbon dioxide
B. water
D. air
Answer: B
States that if the temperature of a given quantity of gas is held
constant, the volume of the gas varies inversely with the
absolute pressure during a change of state
A. Daltons Law
C. First Law of Thermodynamics
B. Charles’ Law
D. Boyle’s Law
Answer: D
A unit of force that produces unit acceleration (in ft/s 2 ) in a unit
mass ( in lbm)
A. Poundal
C. Newton
B. Pound
D. Dyne
Answer: A
Which of the following does not belong to the group?
A. Potential Energy
C. Heat Energy
B. Kinetic Energy
D. Flow Energy
Answer: C
Why does a cube of ice float in water?
A. Ice has lower temperature than water
B. There are more water than ice
C. The density of ice is lesser than water
D. None of the above
Answer: C
Which refrigerant is completely miscible with oil
A. ammonia
C. carbon dioxide
B. R12
D. R134a
Answer: B
The work done in pushing a fluid across a boundary, usually into
or out of a system is called____
A. Potential energy
C. Kinetic Energy
B. Flow Energy
D. Internal energy
Answer: B
Ammonia is not used in domestic refrigeration and common
airconditioning because:
A. ammonia is highly soluble in water
B. ammonia is flammable and toxic
C. ammonia is the cheapest refrigerant
D. ammonia is non ozone depletion potential
Answer: B
Energy balance for steady flow process is
A. Energy (In) = Energy (out)
B. Energy (In) – Energy (out) = change in total energy
C. Energy (In) = change in total energy
D. Energy (In) + Energy (out) = change in total energy
Answer: A
Refrigerants 22 (R22) which is an HCFC, has 1/20 th the ozone
depletion potential (ODP) of R11 and R12. Hence , it can be
continue to be used for quite sometime. However, all these have
global warming –potential (GWP) . Because of this R22 will have
to be phased out by year
A. 2010 AD
C. 2030 AD
B. 2020
D. 2040
Answer: C
Which of the statements is incorrect regarding the functions of
the liquid receiver?
A. stores unused refrigerant returning from condenser
B. stores refrigerant to be evaporated by the expansion valve C.
provides a place to store refrigerant when pumping out the
evaporator during maintenance operations
D. stores oil that is carried along with refrigerant
Answer: D
______is a composite property applicable to all fluids and is
defined by sum of internal energy and the product of pressure
and volume.
A. Heat
C. Enthalpy
B. Work
D. total Work
Answer: C
States that energy is neither created nor destroyed ; it can only
change forms
A. Zeroth Law of ThermodynamicsC. Daltons Law
B. First Law of Thermodynamics D. Archimedes Principles
Answer: B
Heat is defined as form of energy that is transferred between
two systems by the virtue of a ______
A. Pressure difference
C. Volume difference
B. Mass difference D. Temperature difference
Answer: D
A shut-off valve that is actuated by an electromagnetic coil is
called
A. solenoid valve
C. float valves
B. float switch
D. holdback valve
Answer: A
If two identical centrifugal pumps are installed in series, the
system flow rate_______
A. is doubled
C. is halved
B. remains the same
D. Zero
Answer: B
A very important consequence of the ideal gas model is that the
internal energy of an ideal gas is a function of ___ only
A. pressure
C. point function
B. temperature
D. volume
Answer: B
The formation and collapse of vapor bubbles that occurs when
pump inlet suction pressure falls to or below the vapor pressure
of the liquid is called
A. sublimation
C. oxidation
B. water hammering Answer: D. cavitation
D
At what temperature readings do the Fahrenheit and Celsius
scales have the same value?
A. -35 degrees
C. -45 degrees
B. -40 degrees
D. -30 degrees
Answer: B
The process done in centrifugal pump by filling-up the suction
line and pump casing with liquid to remove air or vapors from
the waterways of the pump is called.
A. priming
C. charging
B. water hammering
D. pumping
Answer: A
PAST BOARD ELEMENTS IN PIPE
Which term does not belong to the group?
A. gear pump
C. screw pump
B. vane pump
D. diaphragm pump
Answer: D
It conducts the water around the turbine
A. Spiral casing
C. Draft tube
B. Wickets gate
D. Governor
Answer: A
This is a type of reaction turbine usually with typical spiral casing
where water enters the runner radially at its outer periphery and
changes direction (imparting energy to the runner) while flowing
along the complex shaped profiles to discharge axially. It is the
most widely used of hydraulic turbine for modern power
generation purposes.
a. Pelton Turbine
C. Francis Turbine
B. Turgo Turbine
D. Kaplan Turbine
Answer: C
These are movable vertical vanes that are actuated by the
governor to control the flow of water and therefore the energy
supplied to the runner.
A. Spillway
C. Runner
B. Headrace pipe D. Wicket gate
Answer: D
It is an expanding tube connecting the outlet passage of a
turbine with the tail water.
A. Draft Tube
C. Forebay
B. Penstock
D. Surge Chamber
Answer: A
It is a hydroelectric plant in which excess water is pumped to an
elevated space during off-peak period and the stored water will
be used to drive hydraulic turbine during the peak period to meet
the peak demand
A. Run-of-River Plant
C. Pumped Storage Plant
B. Storage Plant
D. None of the above
Answer: C
It is channel that conduct water away from the turbine
A. Headrace Pipe C. Forebay
B. Penstock
D. Tailrace
Answer: D
The speed of a hypothetical model turbine having the same
configuration as the actual turbine, when the model would be of
the proper size to develop 1 hp at a head of 1 ft.
A. Synchronous speed
C. Specific speed
B. Runaway speed D. Turbine speed
Answer: C
The difference in elevation between the headwater and the
tailwater or tailrace
A. Dynamic head
C. Net head
B. Gross head
D. Effective head
Answer: B
The ratio of the effective head to the gross head
A. Mechanical efficiency
C. Hydraulic efficiency
B. Penstock efficiency
D. Volumetric efficiency
Answer: B
The ratio of the head utilized to the effective head
A. Mechanical efficiency
C. Hydraulic efficiency
B. Penstock efficiency
D. Volumetric efficiency
Answer: C
This is a grid or screen composed of parallel bars to catch
floating debris. It prevents leaves, branches, and other water
contaminants from entering the penstock
A. Surge tank
C. Trash Rack
B. Butterfly valve D. Weir
Answer: C
Heads between 70 and 800 ft generally indicate this type of
turbine
A. Impulse turbine
C. Propeller turbine
B. Reaction turbine
D. Pelton turbine
Answer: B
It is the term used that refers to water in the reservoir.
A. Headwater
C. Discharge
B. Tailwater
D. Stored water
Answer: A
Heads below about 70 ft call for this type of turbine
A. Impulse turbine C. Propeller turbine
B. Reaction turbine D. Pelton turbine
Answer: C
This is a propeller - type reaction turbine with both adjustable
guide vanes and runner blades
A. Kaplan Turbine C. Pelton Turbine
B. Turgo Turbine
D. Cross - flow
Answer: A
The functions of this hydraulic turbine part are (1) It enables the
turbine to be set above the tailwater level without losing any
head thereby and (2) It reduces the head loss at submerged
discharge to increase the net head available to the turbine
runner
A. Spiral casing
C. Draft tube
B. Wicket gate
D. Butterfly valve
Answer: C
It is basically hydroelectric power utilizing the difference in
elevation between high and low tide to produce energy
A. Water power
C. Tidal Power
B. Fluid Power
D. Wave Power
Answer: C
The power output of this plant depends on the water flow in the
river, at low river flows the output decreases accordingly A.
Pumped Storage Plant
C. Run-of-River Plant
B. Storage Plant
D. All of the above
Answer: C
It is a tank with free surface provided at the transition from the
low-pressure headrace or tunnel to the penstock. It protects the
headrace pipe or tunnel from excessive changes in pressure and
supply or storing water as required
A. Surge tank
C. Draft tube
B. Butterfly valve D. Spillway
Answer: A
The intake pipe to a hydraulic turbine from a dam
A. Forebay
C. Draft tube
B. Penstock
D. Tairace
Answer: B
The rotating part of the turbine where the water imparts its
energy onto the turbine shaft
A. Runner
C. Flywheel
B. Impeller
D. Lobe
Answer: A
A kind of fluid flow where in the fluid travels parallel to the
adjacent layers and the paths of individual particles do not cross
or interest.
A. Turbulent flow C. Laminar flow
B. Critical flow
D. Steady flow
Answer: C
The formation and collapse of vapor bubbles that occurs when
the pump inlet suction pressure falls to or below the vapor
pressure of the liquid is called
A. Priming
C. Foaming
B. Cavitaton
D. Net positive suction head
Answer: B
PAST BOARD ELEMENTS IN PIPE
A property of lubricating oil that measures the thickness of the
oil and will help determine how long oil will flow at a given
temperature is known as
A. Pour point
C. Flash Point
B. Relative density D. Viscosity
Answer: D
A wind energy system transforms the _____of the wind into
mechanical or electrical energy that can be harnessed for
practical use
A. Potential Energy
C. Heat Energy
B. Internal Energy
D. Kinetic Energy
Answer: D
A flow at low Reynolds number with smooth steam lines and
shear and conduction effects owing entirely to the fluids
molecular viscosity and conductivity.
A. Turbulent
C. Laminar
B. Critical
D. Non-viscous
Answer: C
It is the rhythmic rise and fall of the ocean waters
A. Tide range
C. Tide
B. Wave D. Water current
Answer: C
The fact that the buoyant force on a floating object is equal to
the weight of displaced liquid is known as
A. Bernoulli’s theorem
C. Archimedes principle
B. Continuity equation
D. Law of Conservation of mass
Answer: C
The primary purpose of a turbine in a fluid loop is to
A. add energy to the flow
C. add mass to the flow
B. extract energy from the flow D. none of the above
Answer: B
It connects the turbine outlet to the tailware sot that the turbine
can be set above the tailwater level
A. draft tube
C. penstock
B. surge chamber D. spillway
Answer: A
It provides an efficient and safe means of releasing flow water
that exceeds the design capacity of the dam.
A. draft tube
C. penstock
B. surge chamber D. spillway
Answer: D
The power required to deliver a given quantity of fluid against a
given head with no losses in the pump is called
A. brake power
C. hydraulic power
B. indicated power D. none of the above
Answer: C
The velocity of fluid is zero at the wall and maximum at the
center because of the
A. velocity effect
C. viscous effect
B. temperature effect
D. none of the above
Answer: C
The work termed for pumps, compressors, fan and blowers is
negative since work
A. done by the fluid
C. done on the fluid
B. rejected by the fluid
D. none of the above
Answer: C
This is a type of water turbine where a lot of water is made to
fall on the blades or buckets and due to the impulse of water the
turbine will start moving
A. Steam turbine
C. Francis turbine
B. Reaction turbine D. Pelton turbine
Answer: D
A device used to prevent water hammer in turbine
A. Governor
C. guard
B. Surge tank
D. wicket gate
Answer: B
This is a vent or hole in the earth’s surface usually in volcanic
region from which steam, gaseous vapors or hot gases issues
A. magma
C. Geyser
B. Fumarole
D. Fault
Answer: B
The typical depth of a geothermal production well in meters
A. 1000 C. 3000
B. 1500 D. 4000
Answer: C
The power available in the wind is proportional to the______of
its speed
A. cube C. fourth Power
B. square
D. All of the above
Answer: A
It is the maximum tidal range
A. Neap tides
C. Ebb tide
B. Spring tide
D. Tidal wave
Answer: B
Natural gas is considered _____-when it is almost pure methane
A. Dry
C. Saturated
B. Wet
D. Superheated
Answer: A
In this type of reactor , the water heated by the nuclear fuel and
boils to steam directly into the reactor vessel . It is then piped
directly to the turbine. The turbine spins , driving the electrical
generator, producing electricity
A. Heavy Water Reactor
C. Boiling Water Reactor
B. Pressurized Water Reactor D. all of the above
Answer: C
It is an air pollution control device that works by electrically
charging the particles of fly ash in the flue gas and collecting
them by attraction to charged metal plates
A. Wet scrubber
C. Bag houses
B. Electrostatic Precipitator
D. Cyclone Separator
Answer: B
This nuclear reactor component, which is made up of carbon and
beryllium, slows down the fast neutrons that are born during the
fission process
A. Control Rods
C. Coolant
B. Moderator
D. Reflector
Answer: B
These boron coated steel rods are used to regulate the rate of
fission chain reaction. They are withdrawn from the core to start
the chain reaction and inserted all the way into the core to stop
it
A. Control Rods
C. Coolant
B. Moderator
D. Reflector
Answer: A
In general usage, the term combined cycle power plant describes
the combination of a gas turbine generator(s) ____cycle) with
turbine exhaust waste boiler(s) and steam turbine generator(s)
(Rankine cycle) for the production of electrical power.
A. Diesel Cycle
C. Reheat Cycle
B. Otto Cycle
D. Brayton Cycle
Answer: D
Natural gas is a fossil fuel formed when layers of buried plants
and animals are exposed to intense heat and pressure. It has
been dubbed as the “fuel of the future” or green fuel and
comprises mainly of _____
A. Propane
C. Ethane
B. Butane
D. Methane
Answer: D
It is the coal ash that exits a combustion chamber in the flue gas
and is captured by air pollution control equipment such as
electrostatic precipitators, baghouses and wet scrubbers
PAST BOARD ELEMENTS IN PIPE
A. Ash
C. Fly Ash
B. Bottoming Ash D. Refuse
Answer: C
Also known as brown coal , it is the lowest-rank solid coal with a
calorific value of less than 8,300 Btu/lb on a moist mineral
matter free basis
A. Bituminous coal C. Lignite
B. Peat D. anthracite
Answer: C
It means using the same energy source for more than one
purpose, such as using the waste heat from an engine for space
heating
A. superposing
C. Cogeneration
B. Topping
D. Combined Cycle Plant
Answer: C
The minimum amount of air required for the complete
combustion of fuel
A. Stoichiometric Air
C. Actual Air
B. Excess Air
D. Percentage excess air
Answer: A
The device or instrument used for measuring the calorific value
of a unit mass of fuel is called
A. calorimeter
C. pyrometer
B. salimeter
D. thermometer
Answer: A
When water (H2O) in the products of combustion is in the vapor
or gaseous form, the heating value is known as A. Higher
heating value (HHV)
C. Lower heating value (LHV)
B. Heating value (HV)
D. Gross calorific value (GCV)
Answer: C
The percent excess air is the difference between the air actually
supplies and the theoretical air required divided by:
A. the theoretically air supplied C. the deficiency air supplied
B. total air supplied
D. none of the above
Answer: A
During a combustion process, the components which exist before
the reaction are called______
A. reactants
C. flue gases
B. products
D. none of the above
Answer: A
The minimum amount of air needed for the complete combustion
of fuel is called_____
A. excess air
C. combustion air
B. theoretical air
D. none of the above
Answer: B
What is the fundamental indicator of good combustion
A. Colorless smoke
B. Releasing maximum nitrogen content of the
combustion with minimum oxygen, carbon dioxide and
carbon monoxide content
C. Presence of minimum oxygen, maximum carbon
dioxide and alll combustibles in the gas
D. Saturated clean smoke
Answer: C
It is a solidified mass of used ash
A. Sludge
C. Carbon residue
B. solidified ash
D. Clinker
Answer: D
Why does older types of economizers were constructed
invariably of cast iron?
A. Because cast iron resists corrosion better than mild
steel and the pressures were comparatively low
B. Because cast iron is more abundant than any other
type of steel
C. Because its thermal conductivity is very small and it
gives greater efficiency to the system
Answer: A
It is an accessory often installed on modern boilers to preheat
air for combustion before it enters the boiler furnace
A. economizer
C. reheater
B. air preheater
D. forced-draft fan
Answer: B
What components are included in the proximate analysis in solid
fuel
A. Carbon dioxide, carbon monoxide and excess oxygen
B. Carbon, hydrogen, oxygen, nitrogen, sulphur, ash and
moisture
C. Carbon, hydrogen, oxygen, sulphur, nitrogen and ash
D. Fixed carbon, volatile matter, ash and moisture
Answer: D
Which elements of fuel is not combustible?
A. Carbon
C. Sulfur
B. Hydrogen
D. Oxygen
Answer: D
A device or an instrument used to record the cylinder pressure of
an engine and piston travel in an x-y graph, where pressure
forms the vertical axis and piston tavel forms the horizontal axis
A. Engine indicator C. Pyrometer
B. Planimeter
D. Dynamometer
Answer: A
A gas which will not be found in the flue gases produced from
the complete combustion of fuel oil is
A. carbon dioxide C. oxygen
B. hydrogen
D. nitrogen
Answer: B
This diagram is used by the operating engineer to detect or
determine leaky piston packing, slicking piston incorrect valve
timing, loose bearings, restricted and or outlet piping etc.
A. Timing diagram C. P-h diagram
B. T-s diagram
D. Indicator diagram
Answer: D
The higher heating value is determined when the water in the
products of combustion is in
A. solid form
C. liquid form
B. vapor form
D. gas form
Answer: C
The effective weight of the brake arm when the brake band is
loose
A. Tare Weight
C. Net Load
B. Gross Load
D. Net Tension
Answer: A
The amount of heat liberated by the complete combustion of a
unit weight or volume of fuel is known as
A. heating value
C. sensible heat
B. latent heat
D. work of compression
Answer: A
The power output of the generator
A. Ideal Power
C. Brake Power
B. Indicated Power D. Electrical Power
Answer: D
An “attemporator” is another name for
A. Dry pipe
C. Reheater
B. superheater
D. Desuperheater
Answer: D
The amount of fuel needed to perform a unit of power
A. Specific fuel consumption C. Heat Rate
B. Steam rate
D. Mass flow rate
Answer: A
PAST BOARD ELEMENTS IN PIPE
The ratio of heat converted to useful power to the heat supplied
A. Mechanical efficiency
C. Thermal efficiency
B. Generator efficiency
D. Engine efficiency
Answer: C
The ratio of the actual power of the engine to its ideal power
A. Mechanical efficiency
C. Thermal efficiency
B. Generator efficiency
D. Engine efficiency
Answer: D
The ratio of the cylinder volumes after and before the
combustion process
A. Compression ratio
C. Cutoff ratio
B. Expanssion ratio
D. All the above
Answer: C
The position of the piston when it forms the smallest volume in
the cylinder
A. Crank End Dead Center Position B.
Bottom Dead Center Position
C. Head End Dead Center Position
D. Clearance Volume
Answer: C
The position of the piston when it forms the largest volume in
the cylinder
A. Crank End Dead Center Position C. Top Dead Center Position
B. Head End Dead Center PositionD. Clearance volume
Answer: A
When four events take place in one revolution of a crankshaft of
an engine, the engine is called
A. rotary engine
C. 2-stroke cycle engine
B. steam engine
D. 4-stroke cycle engine
Answer: C
What is the model cycle for spark ignition engine
A. Diesel cycle
C. Otto cycle
B. Brayton cycle
D. Carnot cycle
Answer: C
Diesel engine fuel is rated in terms of
A. Cetane number C. Power output
B. Octane rating
D. Net Calorific Value
Answer: A
The distance that the piston can travel in one direction
A. Bore
C. Clearance
B. Stroke
D. Displacement
Answer: B
The minimum volume formed in the cylinder when the piston is
at the top dead center
A. Displacement volume
C. Clearance volume
B. cylinder Volume
D. None of the above
Answer: C
It is a fictitious pressure which, if it acted on the piston during
the entire power stroke, would produce the same amount of net
work as that produced during the actual cycle
A. Average pressure
C. Maximum pressure
B. Mean effective pressure
D. Minimum pressure
Answer: B
The power developed in the engine cylinder as obtained from the
pressure in the cylinder
A. ideal power
C. Brake power
B. Indicated power D. Electrical power
Answer: B
The pressure and torque spent in overcoming friction of
reciprocating and revolving parts of the engine and automobile
before it reached the drive shaft
A. Electrical losses C. Break power
B. Indicated power D. Friction power
Answer: D
It is an instrument for determining brake power usually by the
independent measurement of force, time and distance through
which the force is moved
A. Planimeter
C. Anemometer
B. Dynamometer
D. Barometer
Answer: B
It is the indicator used to determine the anti-knock
characteristics of gasoline
A. Octane Number C. compression Ratio
B. Centane Number D. Viscosity
Answer: A
Draws fuel from the tank through the primary fuel filter. This
provides flow throughout the low portion of the fuel system.
A. Fuel injection pump
C. Fuel transfer pump
B. Valve lifter
D. Oil pan
Answer: C
Acts as a balancer and provide momentum during dead stroke in
a cycle.
A. Flywheel
C. Crankshaft
B. Oil cooler
D. After cooler
Answer: A
Are steel tubes with seat at both ends and bridges the motion
from camshaft to rocker arm.
A. Push rod
C. Valve lifter
B. Suction bell
D. Flywheel
Answer: A
Passage of coolant from the engine block to the cylinder head.
A. Water jacket
C. Oil cooler
B. Fuel transfer pump
D. turbo charger
Answer: A
Are used to cool incoming air so that the volume of air available
is increased.
A. After cooler
C. Radiator
B. Waste gates
D. Muffler
Answer: A
The difference between the maximum and minimum volume.
A. Displacement volume
C. Top dead center
B. Clearance volume
D. Differential volume
Answer: A
These are used to seal the gasses within the cylinder and to
keep the oil out.
A. Piston Rings
C. Cylinder Liner
B. Combustion Chamber
D. Piston Plug
Answer: A
The ratio of constant pressure specific to the constant volume
specific heat
A. Compression ratio
C. Cutoff ratio
B. Expansion ratio
D. Specific heat ratio
Answer: D
Process where the heat is added in the Otto cycle.
A. constant temperature
C. constant entropy
B. constant volume
D. constant pressure
Answer: B
The ideal cycle for the compression-ignition reciprocating engines
A. Diesel cycle
C. Dual cycle
B. Otto cycle
D. Carnot cycle
Answer: A
Process where the heat is added in the Diesel cycle. A.
constant temperature
C. constant entropy
B. constant volume
D. constant pressure
Answer: D
PAST BOARD ELEMENTS IN PIPE
It is used to reduce the friction of bearings and sliding surfaces
in machines and thus diminish the wear, heat and possibility of
seizure of the parts
A. Lubricant
C. Wax
B. Gasoline
D. Benzene
Answer: A
In a heat engine, the ratio of break power to the indicated power
is called:
A. thermal efficiency
C. generator efficiency
B. mechanical efficiency
D. engine efficiency
Answer: B
The efficiency of Otto cycle depends upon the
A.pressure ratio
C. compression ratio
B. specific heat ratio
D. cut-off ratio
Answer: C
The maximum temperature of Diesel cycle will occur
A. after isentropic compression
B. after isentropic expansion
C. at the end isobaric heating
D. at the beginning of adiabatic compression
Answer: C
The ratio of the average load to the peak over a designated
period of time
A. Demand Factor
C. Load Factor
B. Capacity Factor
D. Diversity Factor
Answer: C
The ratio of the sum of individual maximum demands of the
system to the overall maximum demand of the whole system.
A.Demand Factor
C. Load Factor
B. Capacity Factor
D. Diversity Factor
Answer: D
The sum of the continuous ratings of all the equipment and
outlets on the customer’s circuit.
A.Reserve load
C. Peak load
B. Maximum demand
D. Connected load
Answer: D
The ratio of the duration of the actual service of a machine or
equipment to the total duration of the period of time considered.
A. Operation Factor C. Demand factor
B. Utilization factor
D. Capacity factor
Answer: A
A series of processes during which the initial state point and the
final state point are the same.
A. Process
C. Cycle
B. Change of state
D. All of the above
Answer: C
The compressibility of an ideal gas is equal to_____.
A. 1.00
C. 0.90
B. 1.40
D. 1.30
Answer: A
The relation pV=C represents a process or change of state,
which is known as _____.
A. Isometric process
C. Isothermal process
B. Isobaric process
D. Isentropic process
Answer: C
In the relation pVn= C, if the value of n=0 the process is said to
be______.
A. Isometric process
C. Isothermal process
B. Isobaric process
D. Polytropic process
Answer: B
In a Carnot cycle, the heat rejection is the_______process.
A.Isentropic expansion
C. Isentropic compression
B. Isothermal expansion
D. Isothermal compression
Answer: D
A system in which the mass inflow and outflow are not equal or
vary with time and in which the mass within the system changes
with time.
A. Steady flow system
B. Steady state system
C. Unsteady state, unsteady flow system
D. Steady flow, steady state system
Answer: C
A form of energy that is a sole function of temperature for
perfect gasses and a strong function of temperature and weak
function of pressure for non-perfect gases, vapors, and liquids.
A. Internal energy C. Flow work
B. Enthalpy
D. Pressure energy
Answer: A
It is that portion of the universe, an atom, a certain quantity of
matter, or a certain volume in space that one wishes to study.
A. Heat
C. System
B. Work
D. Efficiency
Answer: C
The ratio of the break mean effective pressure to the indicated
mean effective pressure.
A. Mechanical efficiency
C. Indicated engine efficiency
B. Brake engine efficiency
D. Brake thermal efficiency
Answer: A
It is the force of gravity per unit volume of a substance.
A. Density
C. Specific volume
B. Specific weight
D. Specific gravity
Answer: B
The ratio of the combined engine efficiency to the brake engine
efficiency.
A. Combined engine efficiency C. Combined thermal efficiency
B. Generator efficiency
D. Brake engine efficiency
Answer: B
It is a kind of thermodynamic system whose mass does not cross
its boundaries.
A. Open system
C. Closed system
B. Steady flow system
D. Transient flow
Answer: C
The ratio of the average load to that of the peak load of plant is
called:
A. output factor
C. load factor
B. demand factor
D. capacity factor
Answer: C
Which law states that “the acceleration of a particular body is
directly proportional to the resultant force acting on it and
inversely proportional to its mass?
A.Zeroth Law of Thermodynamics
B. Second law of Thermodynamics
C. First Law of Thermodynamics
D. Newton’s Second Law of Motion
Answer: D
The ratio of the peak load to the connected load is known as:
A. output factor
C. load factor
B. demand factor
D. capacity factor
Answer: B
The difference between the power plant installed capacity and
the peak load is called:
A.average load
C. reserve over peak
B. connected load
D. none of the above
Answer: C
A substance that receives, transports and transfers energy.
A. Reservoir
C. Engine
B. Working substance
D. Heat sink
Answer: B
PAST BOARD ELEMENTS IN PIPE
The law of thermodynamics that deals with the law of
conservation of energy, which states that energy can neither be
created nor destroyed.
A. Zeroth Law of Thermodynamics
B. Second law of Thermodynamics
C. First Law of Thermodynamics
D. Third Law of Thermodynamics
Answer: C
It states that in any mechanical mixture of gases and vapors
(those that do not combine chemical) the total pressure of the
gaseous mixture such as moist air is equal to the sum of the
partial pressure exerted by the individual gases or vapors.
A. Joule’s Law
C. Amagat’s Law
B. Dalton’s Law
D. Charle’s Law
Answer: B
It is the ideal cycle for a gas turbine plant.
A. Carnot cycle
C. Diesel cycle
B. Rankine cycle
D. Brayton cycle
Answer: D
It is the most thermal efficient cycle consisting of two (2)
isentropic processes and two (2) isothermal processes.
A. Carnot cycle
C. Otto cycle
B. Rankine cycle
D. Diesel cycle
Answer: A
How can the average temperature during heat rejection process
of a Rankine cycle be decreased?
A. increase boiler pressure
C. increase inlet turbine pressure
B. increase condenser pressure D. reduce turbine exit pressure
Answer: D
It is a substance existing in the gaseous phase but relatively near
its saturation of temperature.
A. Gas
C. Vapor
B. Air
D. Oxygen
Answer: C
What is commonly done to a vapor power cycle when the turbine
has excessive moisture?
A. frosting
C. reheating
B. diffusing
D. dehumidifying
Answer: C
The point at which the saturated liquid and saturated vapor
states are identical.
A. Critical point
C. Saturated liquid-vapor point
B. Triple point
D. Saturation Point
Answer: A
A form of energy that is transferred between two systems by
virtue of temperature difference.
A. Heat
C. Potential Energy
B. Kinetic Energy
D. Electrical Energy
Answer: A
The point at which heat transfer stops.
A. Steady-flow
C. Thermodynamic equilibrium
B. Thermal equilibrium
D. Steady-state
Answer: B
A thermodynamic process with no heat transfer.
A. Isentropic Process
C. Throttling process
B. Adiabatic Process
D. All of the above
Answer: D
It is an instrument used for determining the specific gravity of a
solution.
A. Barometer
C. Calorimeter
B. Hydrometer
D. Manometer
Answer: B
An energy interaction that is not caused by a temperature
difference between a system and its surrounding.
A. Work
C. Convection
B. Conduction
D. Heat
Answer: A
It refers to the temperature at which all molecular motion ceases
according to the kinetic theory of heat.
A. 0 K
C. -273 C
B. 0 R
D. All of the above
Answer: D
Changing of solid directly to vapor, without passing through the
liquid state, is called
A. Sublimation
C. Condensation
B. Evaporation
D. Vaporization
Answer: A
The area under the curve on a pressure-volume diagram
represents_______.
A. Steady Flow Work
C. Net Work
B. Nonflow Work
D. Cycle Work
Answer: B
A rigid container is heated by the sun. There is no shaft work
associated with the container. From the first law of
thermodynamics, you determine the resulting work to be: A.
Equal to the heat transfer
B. equal to the volume times the change in pressure
C. equal to the change in internal energy
D. equal to zero
Answer: D
A boiler steam pressure gage should have a range of at least
_____times the maximum allowable working pressure.
A. 1.0
C. 1.50
B. 1.25
D. 1.75
Answer: C
It is a valve designed to allow a fluid to pass through in one
direction only.
A. Gate valve
C. Quick-return valve
B. Globe valve
D. Check valve
Answer: D
An ideal gas is compressed isothermally. The enthalpy change is
equal to_____.
A. Zero
C. Negative
B. Positive
D. None of the above
Answer: A
The_______is constant in an adiabatic throttling process.
A. Pressure
C. Internal energy
B. Volume
D. Enthalpy
Answer: D
The net work output of a heat engine is always________.
A. less than the amount of heat input
B. more than the amount of heat input
C. less than the amount of heat ouput
D. none of the above
Answer: A
The sum of all the energies of all the molecules in a system,
energies that appear in several complex forms.
A. Entahlpy
C. Kinetic energy
B. Internal energy
D. Potential energy
Answer: B
It is a liquid whose temperature is below the saturation
temperature corresponding to its pressure.
A. Saturated liquid
C. Subcooled liquid
B. Superheated liquid
D. none of the above
Answer: C
PAST BOARD ELEMENTS IN PIPE
A device that violates the first law of thermodynamics is called a
A. Perpetual motion machine of the second kind
B. Perpetual motion machine of the first kind
C. Perpetual motion machine of the third kind
D. None of the above
Answer: B
The rotary compressor are used for delivering
A. small quantities of air at high pressures
B. small quantities of air at low pressures
C. large quantities of air at high pressures
D. large quantities of air at low pressures
Answer: D
The difference of the superheated temperature and saturation
temperature at the pressure is known as A. degree of
supersaturation
C. degree of superheat
B. degree of undercooling
D. none of these
Answer: C
In a centrifugal compressor, an increase in speed at a given
pressure ratio causes
A.increase in flow
B. increase in efficiency
C. decrease in flow
D. increase in flow and decrease in efficiency
Answer: D
The Parson’s reaction turbine has
A. only moving blades
B. identical fixed and moving blades
C. only fixed blades
D. fixed and moving blades of different shape
Answer: B
The maximum efficiency of a De-Laval turbine in terms of nozzle
angle, α is
A. sin2 α
C. tan2 α
2
B. cos α
D. cot2 α
Answer: B
Curtis turbine is a
A.velocity compounded turbine
B. pressure-velocity compounded turbine
C. pressure compounded turbine
D. none of these
Answer: B
The compounding of turbines is done in order to
A. reduce speed rotor
C. reduce exit losses
B. Improve efficiency
D. all of these
Answer: A
The reheat factor is the ratio of
A. cumulative heat drop to the Isentropic heat drop
B. total useful heat drop to the total Isentropic heat drop
C. isentropic heat drop to the supplied
D. none of the above
Answer: A
The function of a distributor in a coil ignition system of internal
combustion engines is
A. to distribute the spark
C. to distribute current
B. to distribute the power
D. to time the spark
Answer: D
The knocking tendency in spark ignition engines may be
decreased by
A.controlling the air fuel mixture
B. reducing the compression ratio
C. controlling the ignition timing
D. all of these
Answer: B
The volumetric efficiency of a well designed engine is
A. 30% - 40%
C. 60% - 70%
B. 40% - 60%
D. 75% - 90%
Answer: D
The Morse test is used to find the indicated power of a
A. single cylinder petrol engine
C. multi-cylinder engine
B. single cylinder diesel engine
D. none of these
Answer: C
The volume of air delivered by the compressor is called
A. free air delivery C. swept volume
B. compressor capacity
D. none of these
Answer: B
Which of the following statement is correct as regard to
centrifugal compressor?
A. the flow of air is parallel to the axis of compressor
B. the impeller rotates at high speeds
C. the static pressure of air in the impeller increases in order to
provide centripetal force on the air
D. the maximum efficiency is higher than multi-stage axial flow
compressors
Answer: C
The volumetric efficiency of compressor
A.increase with decrease in compression ratio
B. increase with increase in compression ratio
C. decrease with decrease in compression ratio
D. decreases with increase in compression ratio
Answer: D
The sub-cooling is a process of cooling the refrigerant in vapor
compression refrigeration system
A.before compression
C. before throttling
B. after compression
D. after throttling
Answer: C
When food products or other hygroscopic materials kept in
different compartments are to be maintained at the same
temperature, then the evaporator
A. at the same temperature with single compressor is used
B. at different temperatures with individual compressor is used
C. at different temperatures with single compressor is used
D. none of these
Answer: D
The refrigerant, commonly used in vapor absorption system, is
A.water
C. Freon
B. ammonia
D. aqua-ammonia
Answer: D
A vapor absorption system
A. gives noisy operation
C. requires little power consumption
B. gives quite operation
D. cools below 0 C
Answer: B
An Electrolux refrigerator is called a
A. single fluid absorption system
B. three fluids absorption system
C. two fluids absorption system
D. none of the above
Answer: B
For steam
A. The critical temperature is 221.2ºC and critical pressure is
374.15 bar
B. The critical temperature is 221.2ºC and critical pressure is
221.2 bar
C. The critical temperature is 374.15ºC and critical pressure is
221.2 bar
D. The critical temperature is 374.15ºC and critical pressure
374.15 bar
Answer: C
PAST BOARD ELEMENTS IN PIPE
With the increase in pressure
A. The boiling point of water decreases and enthalpy of
evaporation increases
B. Both the boiling point of water and the enthalpy of
evaporation decreases
C. The boiling of water increases and the enthalpy of
evaporation decreases
D. Both the boiling point of water and the enthalpy of
evaporation increases
Answer: C
In a boiler, various heat losses take place. The biggest loss is
due to
A.moisture in fuel
C. steam formation
B. unburnt carbon
D. dry flue gases
Answer: D
The specific volume of water when heated from 0ºC?
A.Increases steadily C. First decreases and then increases
B. Decreases steadily D. First increases and then decreases
The fuel mostly used in boilers is
A. brown coal
C. caking bituminous
B. peat
D. non-caking bituminous coal
Answer: D
Which of the following statement is wrong?
A. the mechanical draft reduces the height of chimney
a balanced draft is a combination of induced and forced
draught
C. the natural draft reduces the fuel consumption
D. all of the above
Answer: C
Steam coal is a
A. Pulverized coal
B. brown coal
Answer: D
The average value of diagram factor lies between
A.0.2 to 0.5
C. 0.65 to 0.9
B. 0.6 to .65
D. 0.9 to 1.2
Answer: C
C. caking bituminous coal
D. non-caking bituminous coal
The draft in locomotive boilers is produced by a
A. chimney
C. steam jet
B. centrifugal fan
D. none of these
Answer: C
B.
A process of heating crude oil to a high temperature under a
very high pressure to increase the yield of lighter distillates, is
known as
A. cracking
C. fractional distillation
B. carbonization
D. full distillation
Answer: A
The missing quality per stroke is equal to
A. cylinder feed – indicated mass of steam
B. mass of cushion + indicated mass of steam
C. cylinder feed + indicated mass of steam
D. mass of cushion steam – cylinder feed
Answer: A
Which of the following statement is incorrect?
A. the liquid fuels consist hydrocarbons
B. the solid fuels have higher efficiency than liquid fuels
C. the liquid fuels have higher calorific value than solid fuels
D. a good fuel should have low ignition point
Answer: B
The ratio of actual vacuum to the ideal vacuum in a condenser is
called
A. condenser efficiency
C. boiler efficiency
B. vacuum efficiency
D. nozzle efficiency
Answer: B
One kg of carbon monoxide (CO) requires 4/7 kg of oxygen and
produces
A.11/3 kg of CO2
C. 77/7 kg of CO2
B. 7/3 kg of CO
D. 8/3 kg of CO
Answer: C
One kg of ethylene (C2H4) requires 2kg of oxygen and produces
22/7 kg of carbon dioxide and
A. 9/7 kg water
C. 7/4 kg of water
B. 11/7 kg of water
D. 11/4 kg of water
Answer: A
The mass of carbon per kg of flue gas is given by
A.11/3 CO2 + 3/7 CO
C. 7/3 CO2 + 3/11 CO
B. 3/7 CO2 + 11/3 CO
D. 3/11 CO2 + 7/3 CO
Answer: A
A safety valve mainly used with locomotive and marine boilers is
A. lever safety valve
B. dead weight safety valve
C. high pressure and low water safety valve
D. spring loaded safety valve
Answer: D
A device used in boiler to control the following flow of steam
from the boiler to the main pipe and to shut off the steam
completely when required, is known as A.
blow off cock
C. stop valve
B. fusible plug
D. economizer
Answer: C
A device used to put off fire in the furnace of the boiler when
the level of water in the boiler falls to an unsafe limit, is called
A. blow off cock
C. stop valve
B. fusible plug
D. economizer
Answer: B
The flow of steam is super sonic
A. at the entrance to the nozzle
B. in the convergent portion of the nozzle
C. at the throat of the nozzle
D. in the divergent portion of the nozzle
Answer: D
Comparing mechanical vapor compression refrigeration system
with absorption refrigeration system, the compressor of the
former is replaced in the latter by
A. an absorber and a liquid pump
B. an absorber, an evaporator, a liquid pump and and a pressure
reduction valve
C. an absorber, a generator, a liquid pump an expansion valve
D. a generator, an evaporator, a liquid pump, and a an
expansion valve
Answer: B
The Freon group of refrigerants are
A. halo-carbon refrigerants
C. inorganic refrigerants
B. azeotrope refrigerants
D. hydro-carbon refrigerants
Answer: A
A refrigerant with the highest critical pressure is
A.R-11
C. R-22
B. R-12
D. ammonia
Answer: D
Which of the following is an azeotrope refrigerant?
A.R-11
C. R-114
B. R-40
D. R-502
Answer: D
The color of the flame of halide torch, in case leakage of Freon
refrigerant, will change to
A. bright green
C. red
B. yellow
D. orange
Answer: A
PAST BOARD ELEMENTS IN PIPE
Which of the following refrigerant is highly toxic and flammable?
A. ammonia
C. sulfur dioxide
B. carbon dioxide
D. R-12
Answer: A
In larger industrial and commercial reciprocating compression
systems, the refrigerant widely used is
A. ammonia
C. sulfur dioxide
B. carbon dioxide
D. R-12
Answer: A
Environmental protection agencies advice against the use of
chlorofluorocarbon refrigerants since
A. these react with water vapor and cause acid rain
B. these react with oxygen and cause its depletion
C. these react with plants and cause green-house effect
D. these react with ozone layer
Answer: D
Most air cooled are designed to operate with a temperature
difference of
A.5 C
C. 14 C
B. 8 C
D. 22 C
Answer: C
The pressure in a capillary tube decreases due to
A. frictional resistance offered by the tube wall
B. acceleration of refrigerant in the tube
C. heat transfer from the tube
D. both a and c
Answer: D
Capillary tube is not used in large capacity refrigeration systems
because
A. cost is too high
B. it is made of copper
C. capacity control is not possible
D. required pressure drop cannot be achieved
Answer: C
The thermostatic expansion valve operates on the changes in the
A. degree of superheat at exit from the evaporator
B. pressure in the evaporator
C. temperature of the evaporator
D. none of the above
Answer: A
Most thermostatic expansion valves are set for a superheat of
A. 5 C
C. 15 C
B. 10 C
D. 20 C
Answer: A
The process of removing the moisture from the food product is
called
A. heat processing
C. canning
B. dehydration
D. pasteurization
Answer: B
In air blast freezing method
A. a very low temperature air is circulated with a very low
velocity
B. a very high temperature air is circulated with a very high
velocity
C. a very low temperature air is circulated with a very high
velocity
D. a very high temperature air is circulated with a very low
velocity
Answer: C
In air blast freezing, the velocity of air varies from
A. 5 to 10 m/min
C. 20 to 30 m/min
B. 10 to 20 m/min
D. 30 to 120 m/min
Answer: D
The difference between the dry bulb temperature and wet bulb
temperature
A. Dry bulb temperature
C. Dew Point temperature
B. Wet bulb depression
D. Degree of Saturation
Answer: B
The wet bulb depression is zero, when the relative humidity is
equal to
A.zero
C. 0.75
B. 0.5
D. 1.0
Answer: D
The minimum temperature to which moist air can be cooled
under ideal conditions in a spray washer is
A. dew point temperature of inlet air C. water inlet temperature
B. wet bulb temperature of inlet air D. water outlet temperature
Answer: B
The by-pass factor of a cooling decreases with
A. decrease in fin spacing and increase in number of rows
B. increase in fin spacing and decrease in number of rows
C. increase in fin spacing and increase in number of rows
D. decrease in fin spacing and decrease in number of rows
Answer: A
In order to cool and dehumidify a stream of moist air, it must be
passed over the coil at a temperature
A. which lies between the dry bulb and wet bulb temperature of
the incoming stream
B. which is lower than the dew point temperature of the
incoming stream
C. which lies between the wet bulb and dew point bulb
temperature of the incoming stream
D. of adiabatic saturation of incoming stream
Answer: B
The index which correlates the combined effects of air
temperature, relative humidity and air velocity on the human
body is known as
A. mean radiant temperature C. dew point temperature
B. effective temperature
D. none of the above
Answer: B
For rectangular ducts, the aspect ratio is equal to
A. sum of longer and shorter sides
B. product of longer and shorter sides
C. difference of longer and shorter sides
D. ratio of longer and shorter sides
Answer: D
The air guide vanes are sometimes installed in axial flow fans in
order to
A. increase the static pressure
B. reduce high frequency sound generation
C. eliminate spiral flow of discharge air
D. all of the above
Answer: C
The axial flow fans are particularly suitable for handling
A. large volumes of air at relatively low pressures
B. large volumes of air at relatively high pressures
C. small volumes of air at relatively low temperature
D. small volumes of air at relatively high pressures
Answer: A
The room air conditioner controls the
A. temperature of air
C. temperature and dust of air
B. temperature and humidity of air D. none of these
Answer: B
The milky white ice is obtained if
A. air is present in it
C. CO2 is present in it
B. impurities are present in water D. none of these
Answer: A
PAST BOARD ELEMENTS IN PIPE
The dry ice is produced by
A. drying the ice
C. by solidifying liquid CO2
B. keeping in an insulated chamber D. none of these
Answer: C
The process of heating and immediately cooling the milk for
controlling the bacteria growth is known as
A. pasteurization
C. blending
B. regeneration
D. none of these
Answer: A
Ice of portable water can crack if frozen at temperature lower
than
A. -12 C
C. -20 C
B. -15 C
D. -20 C
Answer: A
The sound power level of a VAV Box (Variable Air Volume)
depends mainly on Volume flow of supply air for a specific size
box, configuration of the VAV box, flexible ducts, diffusers and
what other factor?
A.Difference in static pressure across the VAV box in WC.
B.Fan Speed in RPM of the VAV fan.
C.Configuration of the Damper actuator of the VAV box.
D.Psychrometric properties of air entering the VAV box.
Answer: A
Axial fans are best suitable for application.
A. Large flow, low head
C. Low flow, high head
B. High head, large flow
D. Low flow, low head
Answer: A
Which of the following axial fan types is most efficient?
A. Propeller
C. Tube axial
B. Vane axial
D. Radial
Answer: B
Constant rotative speed of the hydraulic turbine runner under
varying load is achieved by a ___________ that actuates a
mechanism that adjust the gate openings.
A. Governor
C. Wicket gates
B. Runner
D. Draft tube
Answer: A
A pipe or conduit used to carry water from reservoir intake to a
reaction turbine is known as:
A. Guide Vane
C. Draft Tube
B. Wicket Gate
D. Penstock
Answer: C
The efficiency of forward curved centrifugal fans compared to
backward curved fans is_________
A. Higher
C. Lower
B. Same
D. None
Answer: C
When selecting a pump for a given application, it is usually
desirable to use a pump that will operate near its BEP which
stands for ______.
A. Brake Effective Horsepower C. Best Effective Point
B. Best Efficiency Point
D. Break Even Point
Answer: B
In order to prevent shock or water hammering in the penstock
when the governor quickly closes the gates, many turbines are
provided with a ________.
A. Surge Tank
C. Draft Tube
B. Intake Valve
D. Flywheel
Answer: A
Name the fan which is more suitable for high pressure
application?
A. Propeller type fans C. Backward curved centrifugal fan
B. Tube-axial fans
D. All of the above
Answer: C
A type of centrifugal pump impeller characterized by wide
passages for water and the ratio of outside impeller to impeller
eye diameter is about 1.5.
A. Francis type
C. Radial type
B. Mixed Flow type
D. Axial type
Answer: A
The seal that allows the impeller shaft of centrifugal pump to pass
from outside of the pump to inside, while maintaining an air tight
seal.
A. Sleeve
C. Wearing Ring
B. Mechanical Seal
D. Packing
Answer: D
Stationary guide vanes of a centrifugal pump surround the
impeller converts velocity energy to pressure head.
A. Diffuser
C. Volute Casing
B. Impeller
D. Impeller vanes
Answer: A
If two identical centrifugal pumps are installed in parallel the
_______ is doubled.
A. Flow rate
C. Power
B. Head
D. Efficiency
Answer: A
________ are used isolate as well as regulates the flow. They
have a high pressure drop even wide open.
A. Check Valve
C. Ball Valve
B. Gate Valve
D. Globe Valve
Answer: D
Which pipe accessories do not belong to the group?
A. Elbows
B. Tees
B. Unions
D. Strainers
Answer: D
_______ pump are known as vortex and periphery pumps.
A. Turbine(Regenerative)Pumps
B. Vertical Turbine Pumps
C. DiaphragmPumps
D. Sliding Vane Pumps
Answer: A
Which types of pump does not belong to the group:
A. Screw Rotary Pump
C. Diaphragm Pump
B. Direct Acting Steam Pump D. Centrifugal Pump
Answer: D
_______ impellers are generally preferred when handling
average waters, because it does no rust and machining it,
making its surface smooth are easy.
A. Stainless Steel
C. Cast-Steel
B. Bronze
D. Cast-iron
Answer: B
A valve used to prevent backflow in the fluid pipe is called:
A. Check Valve
C. Angle Valve
B. Globe Valve
D. Gate Valve
Answer: A
_________ is a single-stage or multistage centrifugal pump
with pumping element suspended from discharge piping also
known as deep well or bore hole pumps.
A. Turbine (Regenerative) Pump C. Vertical Turbine Pump
B. Screw Pump
D. Sliding Vane Pump
Answer: C
________ pumps are intended for handling thick pulps,
sewage sludge, acid, or alkaline solutions, mixture of water
and gritty solids that wear out metal pumps.
A.Direct acting steam pumps
C. Vertical Turbine Pumps
B. Lobe
pumps
D. Diaphragm pumps
Answer: D
PAST BOARD ELEMENTS IN PIPE
_________ is that part of a rotary pump mounted on the drive
shaft; it is the principal pumping member.
A. Idle Rotors
C. Rotor
B. Stator
D. Driver
Answer: C
What is the relationship of the capacity of centrifugal pump,
Q to impeller diameter, D, when there are two impeller
diameters (one is original the other cut down diameter) in the
same pump?
A. Q is directly proportional to the square of D.
B. Q is directly proportional to D.
C. Q is inversely proportional to D.
D. Q is inversely proportional to the square of D.
Answer: B
What is the relationship of the horsepower of a centrifugal
pump, P, to the impeller speed, N, is pump is at two different
rotative speeds?
A. P is inversely proportional to the cube of N.
B. P is inversely proportional to N.
C. P is directly proportional to N.
D. P is directly proportional to the cube of N.
Answer: D
Hydraulic turbine suitable for low head:
A. Pelton wheel
C. Kaplan turbine
B. Francis turbine
D. Turgo turbine
Answer: C
If two identical centrifugal pump are installed in series, the
system flow rate _________.
A. is doubled
C. remains the same
B. is halved
D. zero
Answer: C
The formation ad collapse of vapor bubbles that occurs when
pump inlet suction pressure falls to or below the vapor
pressure of the liquid is called:
A. sublimation
C. water hammering
B. oxidation
D. cavitation
Answer: D
The process done in centrifugal pump by filling-up the suction
line and pump casing with liquid to remove air or vapors from
the waterways of the pump is called:
A. priming
C. water hammering
B. charging
D. pumping
Answer: A
Which term does not belong to the group:
A. gear pump
C. vane pump
B. screw pump
D. diaphragm pump
Answer: D
The efficiencies of all reversible heat engines operating
between the same two reservoirs ________.
A. differ
C. are the same
B. are unequal
D. none of the above
Answer: C
A process with no heat transfer is known as
A. isobaric process
C. isothermal process
B. adiabatic process
D. isometric process
Answer: B
The relative density of a substance is the ratio of its density to
the density of:
A. mercury
C. oil
B. gas
D. water
Answer: D
This type of heat exchanger allows fluids to flow at right angles
to each other
A.Series flow
C. Parallel flow
B. Cross flow
D. Counter flow
Answer: B
The fact the total energy in any one energy system remains
constant is called the principle
of _______.
A. Conservation of Energy
B. Conservation of Mass
C. Second Law of Thermodynamics
D. Zeroth Law of Thermodynamics
Answer: A
A process for which the inlet and outlet enthalpies are the same
A. Isenthalpic
C. Enthalpy Conservation
B. Throttling
D. Steady State
Answer: B
The sum of energies of all the molecules in system, energies
that appear in several complex forms.
A. Kinetic Energy
C. Internal Energy
B. External Energy
D. Flow Work
Answer: C
A system that is completely impervious to its surrounding.
Neither mass nor energy cross its boundaries.
A. Open system
C. Closed system
B. Adiabatic system
D. Isolated system
Answer: D
A device used to measure small and moderate pressure
difference.
A. Manometer
C. Bourdon gage
B. Barometer
D. Piezometer
Answer: A
A vapor having a temperature higher than the saturation
temperature corresponding to its pressure.
A. Superheated vapor
C. Super saturated vapor
B. Saturated vapor
D. Subcooled vapor
Answer: A
The energy or stored capacity for performing work possessed
by a moving body, by virtue of its momentum.
A. Internal energy
C. Gravitational potential energy
B. Work
D. Kinetic energy
Answer: D
The thermodynamic process wherein temperature is constant
and the change in internal energy is zero.
A. Isobaric process
C. Isometric process
B. Isothermal process
D. Polytropic process
Answer: B
The function of a pump or compressor is to
A. transfer heat from one fluid to another
B. increase the total energy content of the flow
C. extract energy from the flow
D. exchange heat to increase energy to the flow
Answer: B
This law states that “all energy received as heat by a
heatengine cannot be converted into mechanical work”.
A. 1st Law of Thermodynamics
B. 2nd Law of Thermodynamics
C. 3rd Law of Thermodynamics
D. All of the above.
Answer: B
The intensity of pressure that is measured above absolute zero
is called:
A. Gage pressure
C. Absolute pressure
B. Vacuum pressure
D. Saturation pressure
Answer: C
This is the ratio of the heat equivalent of the brake or useful
horsepower developed by an engine and available on its
crankshaft to the heat during the same time.
A. Brake engine efficiency C. Indicated thermal efficiency
B. Combined thermal efficiency D. Brake thermal efficiency
Answer: D
PAST BOARD ELEMENTS IN PIPE
Answer: A
Flow work is equal to pressure times ____________.
A. temperature
C. entropy
B. internal energy
D. specific volume
Answer: D
This form of energy is due to the position or elevation of the
body.
A. internal energy
C. kinetic energy
B. potential energy
D. work
Answer: B
Another term for constant volume process.
A. isometric
C. isochoric
B. isovolumic
D. all of the above
Answer: D
Work done by the steam during a reversible adiabatic
expansion process in the turbine.
A. Brake Work C. Actual Fluid Work
B. Ideal Work
D. Combined Work
Answer: B
The efficiency of Carnot cycle depends upon the
A. pressure
C. entropy
B. volume
D. temperature
Answer: D
It is the heat required in a constant-pressure process to
completely vaporize a unit-mass of liquid at a given
temperature.
A. latent heat vaporization C. enthalpy of vaporization
B. hfg
D. all of the above
Answer: D
It is a commonly used device for measuring temperature
differences or high temperatures.
A. Thermistor
C. Thermocouple
B. Bimetallic Strip
D. Mercury in glass
Answer: C
The science and technology concerned with precisely
measuring energy and enthalpy.
A. Thermodynamics
C. Chemistry
B. Calorimetry
D. None of the above
Answer: B
The rate of doing work per unit of time
A. Torque
C. Power
B. Force
D. Moment
Answer: C
In an ideal Rankine cycle with fixed boiler and condenser
pressure. What is the effect of superheating the steam to a
higher temperature to the cycle thermal efficiency? A. the
cycle thermal efficiency will increase
B. the cycle thermal efficiency will decrease
C. the cycle thermal efficiency will remain constant
D. none of the above
Answer: A
A vapor having a temperature higher than the saturation
temperature corresponding to the existing pressure.
A. Superheated Vapor
C. Saturated Vapor
B. Wet Vapor
D. None of the above
Answer: A
It is the work done in pushing a fluid across a boundary,
usually into or out of a system.
A. Mechanical work
C. Nonflow Work
B. Flow Work
D. Electrical work
Answer: B
A liquid that has a temperature lower than the saturation
temperature corresponding to the existing pressure.
A. Subcooled liquid
C. Saturated liquid
B. Unsaturated liquid
D. Water
The combination of two refrigerants which cannot be separated
by distillation process.
A. Hydrocarbon
C. Azeotropes
B. Isotopes
D. Zeotropes
Answer: C
R-600 is what refrigerant?
A. Methane
B. Nonane
Answer: C
C. Butane
D. None of these
It states that when two bodies are in thermal equilibrium with a
third body. They are in thermal equilibrium with each other and
hence are at the same temperature.
A. 1st Law of Thermodynamics C. 2nd law of Thermodynamics
B. Zeroth Law of Thermodynamics D. Boyle’s Law
Answer: B
It states that the change of internal energy of an ideal gas is a
function of only the temperature change
A. Charles’ Law
C. Boyle’s Law
B. Joule’s Law
D. Law of Conservation of mass
Answer: B
The energy or stored capacity for performing work possessed by
a moving body, by virtue of its momentum.
A. Potential Energy
C. Kinetic Energy
B. Internal Energy
D. Flow work
Answer: C
The volume between the engine head and the piston when the
piston is at the top dead center
A. Clearance volume
C. Displacement volume
B. Volume of gas drawn in
D. Volume of exhaust gas
Answer: A
The process in which both the intake and exhaust valves are
closed, and the air-fuel mixture is processed by the upward
piston movement.
A. Intake Stroke
C. Compression Stroke
B. Power Stroke
D. Exhaust Stroke
Answer: C
Is a term expressing the combination of internal molecular
energy, expansion work and flow work.
A. Entropy
C. Enthalpy
B. Internal Energy
D. Mechanical Work
Answer: C
…END…