POE
Study Guide
Define:
Compound
Composite
Casting
Extrusion
Forging
Forming
Ceramics
Thermoplastics
Thermosets
Convection
Conduction
Stefan’s Law
R-value
U-value
Free Body Diagram
Ductile
Tensile
Flowchart
Scalar
Vector
Know:
Energy sources - Renewable and non-renewable
How to determine current, resistance, or voltage in a series and parallel circuit
Advantages/disadvantages of fuel cell technology
What is and is not included in a design brief? Design Matrix?
Difference in photo resistor, photo transistor, and photo cell and which are analog and
digital.
Potentiometer - digital or analog?
Basic components of a fluid power system - know what happens to pressure in this type
system
Calculate:
Moment of Inertia
Stain
Stress
Beam Deflection
Modulus of Elasticity
Reaction force at a point on a truss system….for ex., at a roller.
Distance in Y and X direction from Centroid
Ideal Mechanical Advantage - for a ½ in 20NC bolt using a 9 in long wrench
Actual Mechanical Advantage
Probability
Median
Horizontal and Vertical Initial Velocity
Distance traveled
Pulleys - speed and weight lifted
Effort and force needed - lever systems
Which type of material that includes polyethylene, nylon, plexiglass can be heated and
formed into new shapes?
ceramics, thermoplastics, thermosets, or vulcanized material
2 or more chemically combined elements are classified as
compounds, composite, microelectronic, mixture
rod = 10 inches long, cross sec area = .2 in , elongated .5 in What is the strain value?
Material that experiences very little plastic deformation prior to rupture or fracture
brittle, ductile, tensile, chip-forming
Define flowchart
Term describing pressure in fluid power system….equal, increasing, decreasing, amplified
MA of fluid power system
A coin is tossed 3 times; what is the probability that exactly 2 tosses are heads.
Probability that a 3 will appear on the 1st roll of a 6 sided die.
How much power does it take to lift a 60 lb ball 6 feet in 4 sec.
Ice sculpture is melting, no breeze, temp 90….what 2 energy transfer mechanisms are at
work?
Know hydraulic/ pneumatic problem solving….What is IMA of hydraulic system to lift a
load 3 feet. Determine MA of hydraulic system
Centroids….look at ppt….know how to determine for L shape, T shape
Determine Mod of Elas given a stress/strain graph
Know how to determine MA and effort force for pulleys
Which term represents a mechanical property….conductivity, flammability, stiffness, reactivity
percent efficiency of winch motor to convert elec power into mechanical power.
Job of an Engineering Technologist
Determine most energy efficient material….check thermodynamics worksheets, notes, ppts
Must use an electrolyzer to produce hydrogen gas to be stored in a fuel cell.
An advantage of a closed hydraulic system is to multiply force.
if piston B is ten times the size of piston A, Piston A will move ten units to one unit of
piston B, but at ten times the force.
What is the projectile range?
acceleration = 32 ft/sec²
angle = 56º
Vix = 36 ft
Which of the following is an output device?
switch, lamp, potentiometer, photocell
Flow of energy from source to consumption - answer deals with production of hydrogen gas in
relation to solar panels and wind turbines.
Heat Box question: a chart showing results from 3 teams.
What was the error team 3 made?
miscalc of change of temperature
inside probe misplaced
outside probe misplaced
internal heat source incorrectly generated
Heat flows from a computer processor to the heatsink by_______ and from the heat sink to the
moving air by ________ and _________.
conduction, radiation, convection
Determine max axial load a cable can support.
Image of traffic light - choose the best FBD of the light support to keep the traffic light from
moving in the wind.
The centroid is how many units from the bottom of the beam?
A pizza is cooling in a pizza box. Which change will decrease the rate of heat flow through the
box?
increasing R value
increasing size of box
increasing temp of pizza inside box
increasing U value
VEX review - advantage of closed loop vs. open loop system
Which term controls the direction and flow
actuator
conductor
value
reservoir
Which term represents a mechanical property?
reactivity
stiffness
conductivity
flammability
In a hydraulic system, the plunger pushes fluid at a velocity of 3 inches per sec. The inner
radius of the pipe is 2 inches. What is the volumetric rate of the fluid?
37.7
5.4
18.6
3.3
Interpret data given as:
mean, median, mode
Probability of tossing a coin 4 times and having it land on heads all 4 times.
A company designs an apple picker pole....must be electrically insulated and flexible, which is
best material?
wood
ceramic
aluminum
stainless steel
How to double IMA - image of truck, ramp out back, and man pushing something up ramp.
double length and double height
double length and half height
double height and keep length same
double length and keep height same
Fuel cell supplies power for small motor (.5 A, .43 V) What is power supplied to motor?
What job is performed by an engineering technologist?
A machinist performs an additive process. He then uses a subtractive process to make the part
smoother. Which of the following processes were used?
milling and drilling
welding and extruding
molding and turning
rapid prototyping and turning
Heat box made of 3 materials, wood, concrete, and foam. R values are given. Which design
best meets constraints and optimizes the wall design?
wood - 1.8; foam - 4.5; concrete - 2.6
All answers have different dimensions of these 3, pick the best.
Which of below correctly justifies an example of fluid power?
factory that automates a box lid being raised
a lift bed...
Using 250lbs of force, how much work is required to move the object 30 feet?
A person is shot out of a cannon.....
Velocity in the vertical direction does not change
Velocity in the horizontal direction does not change