1) Which fluid is used in hydraulic power systems?
a. water
b. oil
c. non-compressible fluid
d. all of the above
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2) Pressure of 1 bar is equal to
a. 14.5 psi
b. 145 psi
c. 12.5 psi
d. 145 x 10-6 psi
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3) . Why is fluid power preferred in mobile vehicles?
1. Power can be transmitted without any delay
2. When overloaded, fluid power systems stop without damaging the components
3. Speed variation cannot be achieved
4. Fluid is non-compressible
a. 1 and 4
b. 2, 3 and 4
c. 1, 2 and 4
d. 1 and 2
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4) What effect does overloading have on fluid power and electrical systems?
a. electrical components get damaged in electrical systems
b. fluid power system stops working without damaging the components
c. both a. and b.
d. none of the above
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5) How is power transmitted in fluid power systems?
a. power is transmitted instantaneously
b. power is transmitted gradually
c. both a. and b.
d. none of the above
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6) Generally liquids are non-compressible but when a large pressure of 70 bar is applied, petroleum oil can be compressed up to
a. 0.5% of its original volume
b. 1% of its original volume
c. 5% of its original volume
d. none of the above
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7) Can all hydraulic fluids be compressed when extremely large pressure is applied?
a. Yes
b. No
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8) The resistance offered to the flow of fluid inside a piston develops into
a. pressure
b. force
c. stress
d. all of the above
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9) At low pressures, liquids are
a. compressible
b. non-compressible
c. unpredictable
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10) Which of the following statements are false?
1. Pressure is resistance to flow
2. Friction creates pressure
3. Load cannot create pressure on the system
4. The pressure developed decreases if load offers more resistance
a. 1, 2 and 4
b. 1 and 2
c. 3 and 4
d. none of the above
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11) In hydraulic systems,
a. the mechanical energy is transferred to the oil and then converted into mechanical energy
b. the electrical energy is transferred to the oil and then converted into mechanical energy
c. the mechanical energy is transferred to the oil and converted into electrical energy
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: the mechanical energy is transferred to the oil and then converted into mechanical energy
Explanation:
No explanation is available for this question!
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12) Which of the following is used as a component in hydraulic power unit?
a. pressure gauge
b. filler gauge
c. valve
d. reservoir
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13) Rotary motion in a hydraulic power unit is achieved by using
a. hydraulic cylinder
b. pneumatic cylinder
c. both hydraulic and pneumatic cylinder
d. none of the above
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14) Accessories used in a hydraulic power unit adjust pressure and are used to generate flow and direction of the fluid.
a. True
b. False
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15) Which of the following statements are true?
1. Bell housing connects motor and pump
2. Centrifugal pump is a non-positive displacement pump
3. Centrifugal pumps allow the back flow of fluid from delivery side to the suction side of the pump
4. The function of vent plug used in a reservoir is to flush out oil
a. 1, 2 and 4
b. 2, 3 and 4
c. 2 and 3
d. all of the above
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16) What is the relation between speed and flow rate for fixed displacement vane pump?
a. flow rate increases with increase in speed of rotor
b. flow rate decreases with increase in speed of rotor
c. flow rate is constant and does not change with change in speed
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: flow rate increases with increase in speed of rotor
Explanation:
No explanation is available for this question!
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17) In fixed displacement vane pump,
a. flow rate decreases with increase in working pressure
b. flow rate increases with increase in working pressure
c. flow rate is constant and does not change with working pressure
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: flow rate decreases with increase in working pressure
Explanation:
No explanation is available for this question!
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18) Which type of motion is transmitted by hydraulic actuators?
a. linear motion
b. rotary motion
c. both a. and b.
d. none of the above
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19) What is the function of electric actuator?
a. converts electrical energy into mechanical torque
b. converts mechanical torque into electrical energy
c. converts mechanical energy into mechanical torque
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: converts electrical energy into mechanical torque
Explanation:
No explanation is available for this question!
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20) Which of the following is a hydraulic cylinder based on construction?
a. single acting cylinder
b. double acting cylinder
c. welded design cylinder
d. all of the above
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21) Which energy is converted into mechanical energy by the hydraulic cylinders?
a. hydrostatic energy
b. hydrodynamic energy
c. electrical energy
d. none of the above
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22) What is the advantage of using a single acting cylinder?
a. high cost and reliable
b. honing inside the inner surface of pump is not required
c. piston seals are not required
d. all of the above
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23) What is the function of a flow control valve?
a. flow control valve changes the direction of oil flow
b. flow control valve can adjust the flow rate of hydraulic oil
c. both a. and b.
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: flow control valve can adjust the flow rate of hydraulic oil
Explanation:
No explanation is available for this question!
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24) What does the numbers in 4/2 valve mean?
a. 4 positions and 2 ways
b. 4 ways and 2 positions
c. none of the above
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25) Which type of solenoid has more chances of coil failure?
a. AC solenoid
b. DC solenoid
c. both AC and DC solenoids
d. none of the above
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26) Which stage in two stage direction control valve is solenoid operated?
a. main stage direction control valve
b. pilot stage direction control valve
c. both stages in two stage direction control are solenoid operated
d. none of the above
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27) Which of the following statements are true for accumulator used in hydraulic systems?
1. Accumulator stores fluid with pressure
2. Accumulator stores fluid without any pressure
3. Accumulator stores compressible liquid
4. Spring is used as an external source to keep the fluid under hydraulic pressure
a. 1, 3 and 4
b. 2 and 3
c. 1 and 4
d. 2, 3 and 4
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28) Which of the following is a gas charged accumulator?
a. bladder type
b. spring loaded accumulator
c. weighted accumulator
d. all of the above
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29) How is pressure of fluid under piston calculated in a weighted accumulator?
a. pressure of fluid = (weight added / piston area)
b. pressure of fluid = (piston area / weight added)
c. pressure of fluid = (weight added / piston force)
d. pressure of fluid = (piston force / weight added)
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Answer
Explanation
Related Ques
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ANSWER: pressure of fluid = (weight added / piston area)
Explanation:
No explanation is available for this question!
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30) Which of the following gas is used in gas charged accumulator?
a. oxygen
b. nitrogen
c. carbon dioxide
d. all of the above
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31) The relation for rapid change in pressure and volume adiabatically is given as
a. p0 v0 = p1 v1 = p2 v2
b. p0 v0 = p1 v1n = p2 v2n
c. p0 v0n = p1 v1n = p2 v2n
d. none of the above
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32) Why is the pilot operated check valve used in clamping operation?
a. to reduce leakage in spool valve
b. to avoid decrease in pressure during clamping
c. both a. and b.
d. none of the above
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33) Which area does the part shown below indicate?
a. rod area
b. full bore area
c. annulus area
d. none of the above
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34) Which of the following statements is true?
a. Meter-in feed circuits have speed control in two directions
b. Standard block feed circuits have speed control in two directions
c. Tank line feed control systems have speed control only in one direction
d. all of the above
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Answer
Explanation
Related Ques
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ANSWER: Standard block feed circuits have speed control in two directions
Explanation:
No explanation is available for this question!
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35) Leakage in rotary chucks can be compensated by
a. flow control valve
b. pilot operated check valve
c. accumulator
d. all of the above
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36) Which valve is used to block the accumulator from the system for the purpose of safety?
a. pilot valve
b. needle valve
c. detent valve
d. all of the above
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37) Which of the following systems generate more energy when used in industrial applications?
a. hydraulic systems
b. pneumatic systems
c. both systems generate same energy
d. cannot say
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38) Which type of compressor requires a reservoir for compressed air and why?
a. rotary compressor to avoid pulsating effect
b. reciprocating compressor to avoid pulsating effect
c. both rotary and reciprocating compressors to avoid pulsating effect
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: reciprocating compressor to avoid pulsating effect
Explanation:
No explanation is available for this question!
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39) Which of the following factors is/are considered while selecting a compressor?
a. type of oil filter required
b. volumetric efficiency
c. viscosity of the liquids used
d. all of the above
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40) Which of the following is a component used in air generation system?
a. pressure switch
b. pressure gauge
c. drier
d. intercooler
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41) Where is an intercooler connected in a two stage compressor?
a. intercooler is connected after the two stage compressor
b. intercooler is connected between the two stages of the compressor
c. intercooler is connected before the two stage compressor
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: intercooler is connected between the two stages of the compressor
Explanation:
No explanation is available for this question!
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42) Give significance of every digit used to denote a flow control valve 2.03
A. 3 denotes the forward movement
B. 3 denotes the backward movement
C. 2 denotes the cylinder number
D. 2 denotes the flow control valve number
a. B and C
b. A and C
c. A and D
d. B and D
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43) Which of the following notations is used to represent a regulator unit?
a. 3.0
b. 0.3
c. 3
d. none of the above
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44) Which of the following logic valve is known as shuttle valve?
a. OR gate
b. AND gate
c. NOR gate
d. NAND
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45) In pneumatic systems, AND gate is also known as
a. check valve
b. shuttle valve
c. dual pressure valve
d. none of the above
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46) What is a pressure sequence valve?
a. it is a combination of adjustable pressure relief valve and directional control valve
b. it is a combination of nonadjustable pressure relief valve and directional control valve
c. it is a combination of adjustable pressure reducing valve and check valve
d. it is a combination of adjustable pressure reducing valve and flow control valve
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Answer
Explanation
Related Ques
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ANSWER: it is a combination of adjustable pressure relief valve and directional control valve
Explanation:
No explanation is available for this question!
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47) Overlapping of signals in pneumatic systems can be avoided by using
a. rolling lever valve
b. idle roller lever valve
c. both a. and b.
d. none of the above
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48) What is the notation used for the sequence of operations mentioned below?
1. Cylinder A undergoes forward stroke
2. Cylinder B undergoes forward stroke
3. Cylinder A undergoes backward stroke
4. Cylinder B undergoes backward stroke
a. A– B– A+ B+
b. A+ B– A+ B–
c. A+ B+ A– B–
d. A+ B–
A+ B–
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49) Which of the following statements is true for cascade method which is used to draw a pneumatic circuit?
a. signal processing valves are connected in parallel
b. when the number of signal processing valves are greater than 4, the signals are strong
c. cascade method does not consider the cost factor
d. all of the above
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Answer
Explanation
Related Ques
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ANSWER: cascade method does not consider the cost factor
Explanation:
No explanation is available for this question!
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50) What is the part, shown in below diagram of 3/2 valve, called?
a. manually operated valve
b. pilot operated valve
c. pressure electric converter
d. none of the above
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