1) Which of the following is used as an accessory in hydraulic power unit? a. pumps b. valves c. motor d. reservoir
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2) Which type of pump is used for lifting water from the ground surface to the top of the building? a. centrifugal pump b. turbine pump c. submersible pump d. all of the above
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3) Pumps used in hydraulic applications are a. positive displacement pumps b. variable displacement pumps c. fixed displacement pumps d. all of the above
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4) What is a positive displacement pump? a. oil from suction side of the pump flows completely to the delivery side b. volume of fluid discharged cannot return back to the suction side of the pump c. discharges fixed volume of fluid every cycle d. all of the above
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5) While operating a positive displacement pump, a. the shut-off valve should be closed on delivery side b. the shut-off valve should be closed on suction side c. the shut-off valve should be opened on delivery side d. none of the above
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6) What effect does working pressure have on input power for radial piston pumps? a. as working pressure increases input power decreases b. as working pressure increases input power increases c. pressure remains constant for different input powers d. none of the above
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7) Radial piston pumps can have, a. cylinder block rotating and cam stationary b. cylinder block stationary and cam rotating c. both a. and b. d. none of the above
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8) Why are hydraulic cylinders cushioned? a. cushioning decelerates the piston of a cylinder b. stress and vibrations can be reduced c. both a. and b. d. none of the above
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9) Which of the following statements is true? a. Tie-rod cylinders are used in applications having working pressure of 70 bar b. Welded type cylinders are used in systems having working pressure more than 70 bar c. Tie-rod cylinders can be used in systems having working pressure more than 70 bar d. all of the above
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10) Which of these actions does a hydraulic cylinder perform? a. pushing b. lifting c. both a. and b. d. none of the above
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11) Leakage in welded type of hydraulic cylinder is prevented by a. wiper in gland cover b. rod seal in end cover c. rod seal in gland cover d. none of the above
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12) In single acting hydraulic cylinders, the piston comes back to its original position due to a. spring force b. self-weight c. momentum of a flywheel d. all of the above
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13) Check valve is a type of a. pressure reducing valve b. pressure relief valve c. directional control valve d. none of the above
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14) A pressure relief valve can be a. direct operated b. pilot operated c. solenoid operated d. all of the above
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15) Which of the following statements are true for throttle valve? 1. Reverse flow of fluid is not possible 2. Input pressure for a throttle valve is more than output pressure 3. The actuator speed can be reduced by a throttle valve 4. Correct flow control valve for a particular application can be selected on the basis of pressure drop specified a. 1, 2 and 3 b. 1, 3 and 4 c. 2, 3 and 4 d. all of the above
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16) How is reverse flow possible in pilot operated check valve? a. spring force lifts the ball due to which reverse flow is possible b. fluid pressure lifts the ball due to which reverse flow is possible c. both a. and b. d. none of the above
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17) What is the difference between pressure relief valve and pressure reducing valve? a. pressure reducing valve is connected between pump and tank line while pressure relief valve is connected between DCV and branch circuit b. pressure relief valve is always normally opened c. pressure reducing valve is connected between DCV and branch circuit while pressure relief valve is connected between pump and tank d. none of the above
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18) Accumulator used in gas charged accumulator is a. hydraulic b. pneumatic c. hydropneumatic d. none of the above
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19) What is the function of pressure switch? a. pressure switch is used to start a motor b. pressure switch is used to stop a motor c. pressure switch is used to de-energize a solenoid d. all of the above
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20) Intensifier used in pneumatic systems has output pressure a. less than input pressure b. more than input pressure c. same as input pressure d. none of the above
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