HYDRAULICS AND PNEUMATICS
10ME73
1) What are the factors to be considered for selecting a hydraulic pump? Explain in brief
2) Explain the construction and working of a external gear pump
3) A vane pump is to have a volumetric displacement of 82cm3 it has a rotor diameter of 5m a
cam ring diameter of 7.5cm and a vane width of 4cm what must be the eccentricity?
4) Explain the working of a hydraulic jack using Pascal’s law
5) Explain the role of a pump in a hydraulic system
6) A vane pump has a rotor diameter of 600mm a cam ring diameter of 90mm and a vane
width of 50mm if the eccentricity is 10mm determine the volumetric displacement
7) Define Pascal’s law
8) With a neat sketch explain the operation of balanced vane pump
9) A pump has a displacement of 100cm3 it delivers 0,0015m3/sec at 1000rpm at 70bar if the
prime mover torque is 120nm find overall efficiency of pump?
10) Accumulator as on emergency power source explain?
11) Pump characteristic curves explain?
12) Filters and strainers explain?
13) Electro pneumatic control explain?
14) Pneumatic pressure regulator explain?
15) With a neat sketch explain the construction of a double acting hydraulic cylinder
16) A pump supplies oil at 0,0016m3/sec to a 40mm diameter double acting hydraulic cylinder if
the load is 500n (extending or retracting) and the rod diameter is 20mm find hydraulic
pressure piston velocity and hydraulic power during extending stroke and hydraulic pressure
piston velocity and cylinder power during retracting stroke
17) Discuss with neat sketch the working of a swash plate axial piston pump
18) Explain the end cushion provided in hydraulic cylinder with a neat sketch
19) A single vane rotary actuator has the following data outside radius of rotor = 12 outer radius
of vane =38mm width of vane=25mm hydraulic pressure developed =70bar find a)the
hydraulic force acting on the vane b) the torque generating capacity of the rotary actuator
20) Explain with neat sketch linear actuators
21) A hydraulic motor has a displacement of 130cm3 operates with a pressure of 105 bar and
has a speed of 2000rpm if the actual flow rate consumed by the motor is 0.005m3/s and the
actual torque delivered by the motor is 2000nm find 1)volumetric efficiency 2)mechanical
efficiency 3)overall efficiency
22) Differentiate between poppet type DCV and sliding spool type DCV
23) Check valve and pilot operated check valve differentiate both?
24) Write the note on needle flow control valve?
25) Explain the working principles of sequence valves?
26) Explain the working principles of counter balance valves?
27) With a neat diagram explain the operation of four way directional control valves
28) Explain the symbols of pressure relief valve
29) Explainwith symbols of unloading valve
30) Explain with symbols of shuttle valve
31) Pressure reducing valve
32) Explain briefly with neat sketch the working of pilot operated pressure relief valve
33) Classify hydraulic control valves explain with neat sketch and give its graphical
representation
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DEPT OF MECHANICAL ENGINEERING ACE
HYDRAULICS AND PNEUMATICS
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10ME73
Draw symbolic representation of simple pressure relief valve
Draw symbolic representation of pressure reducing valve
Draw symbolic representation of sequence valve
Draw symbolic representation of counter balance valve
Draw symbolic representation of manually operated spring controlled here position four way
valves
Explain with suitable circuits how the single acting of hydraulic cylinders
Design and explain the hydraulic power circuit for sequencing of the following operation in a
drilling machine a) clamping the work piece 2) drilling the work piece 3) undamping the work
piece
With the help of neat circuit diagram explain the counter balance valve application
With the help of neat circuit diagram explain the use of accumulator as a hydraulic shock
absorber
With the help of neat circuit diagram explain locked cylinder using pilot check valves
Explain with neat sketches meter in and meter out circuits
What are hydraulic accumulators classify the different accumulators used in hydraulic
system and explain spring loaded hydraulic accumulator
Explain with the help of a hydraulic circuit how the cylinder speed Can be controlled by
metering out oil from the cylinder
Compare a dead weight type accumulator with a spring loaded type accumulator explain
their merits and demerits
Derive an equation for beta efficiency
Explain briefly filters and strainers n hydraulic system
Derive expression for beta efficiency
Discuss about sealing devices
What are the problems caused by gases in hydraulic fluids?
What are the parameters we consider for sizing of a reservoir
Explain sealing devices used in hydraulic systems
Differentiate between the following 1) single acting and double acting pneumatic cylinder 2)
air motor and air cylinder
Explain with neat sketch the working of valve seat four way two position direction control
valve
Write a note on cylinder mountings
What are the advantages using pneumatic system
Explain with neat sketch and cushion arrangements in double acting cylinder
List any eight applications of compressed air
With a neat sketch explain the construction of end cushioning
With a neat sketch explain any four mounting arrangement of pneumatic cylinders
With a circuit diagram explain the use of memory valve
Explain a pneumatic circuit based on or logic gate
With a neat diagram explain quick exhaust valve
Explain the principle ad procedure for cascade system
With a neat diagram explain the function of a lubricator in pneumatic circuits
What do you mean by quick exhaust valve explain its working principle with a sketch
Explain with a pneumatic circuit he control of extension of a double acting cylinder using or
and and logic gates
2
DEPT OF MECHANICAL ENGINEERING ACE
HYDRAULICS AND PNEUMATICS
10ME73
70) With a neat sketch explain how the following functions are generated in pneumatic systems
1)and 2)not 3)or
71) Explain quick exhaust valve with its graphical symbol only
72) Elecropneumatic control with neat sketch explain
73) Explain with diagram application of memory valve
74) Explain with block diagram needle flow control valve
75) Explain with sketch air dryers
76) Explain why oil is preferred in fluid power system instead of water
77) What are the advantages of NP pumps
78) What are the advantages of PDP pumps
79) Distinguish between closed loop and open loop fluid power system
80) List out the fluid power application
81) Enumerate the differences between reciprocating and rotary pumps
82) List out the main parts of a vane pump
83) Explain why gear pumps are fixed displacement pumps
84) Explain the concept of extension and retraction with respect to a linear actuator
85) Explain with neat sketch gravity return
86) List out the different applications of cylinders
87) List out the common problems associated with cylinders
88) What is the functions of a counter balancing valve
89) What is the function of check valves
90) What are the basic functions or pressure controlled valves.
91) Define pneumatic system. Give the difference between hydraulic and pneumatic
system.
92) Explain end position cushioning in pneumatic cylinder with diagram.
93) Explain the following (1) magnetic type rodless cylinder (2) cable type rodless
cylinder
94) With the help of suitable circuit, explain the following: (1) suction line filtering (2)
pressure line filtering
95) What are the functions of reservoir system? Explain briefly with neat sketch
construction of reservoir system
96) List six desirable properties of hydraulic fluid and explain any two properties.
97) With neat sketch, discuss sealing devices.
98) With neat sketch, explain full flow filter.
99) What are the problems caused by gases in hydraulic fluids?
100)
What are the parameters we consider for sizing of a reservoir?
101)
Explain the characteristics of compressed air.
102)
State five disadvantages of using air instead of hydraulic oil.
103)
Explain the construction of double acting cylinder used in pneumatics with
neat sketch\
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DEPT OF MECHANICAL ENGINEERING ACE