Hydraulics & Pneumatics Test Questions - Set 4

1)   Which of the following is used as an accessory in hydraulic power unit?

a. pumps
b. valves
c. motor
d. reservoir
Answer  Explanation 

ANSWER: reservoir

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


3)   Pumps used in hydraulic applications are

a. positive displacement pumps
b. variable displacement pumps
c. fixed displacement pumps
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: the shut-off valve should be opened on delivery side

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: as working pressure increases input power increases

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: both a. and b.

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: both a. and b.

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


10)   Which of these actions does a hydraulic cylinder perform?

a. pushing
b. lifting
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: both a. and b.

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: rod seal in gland cover

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


13)   Check valve is a type of

a. pressure reducing valve
b. pressure relief valve
c. directional control valve
d. none of the above
Answer  Explanation 

ANSWER: directional control valve

Explanation:
No explanation is available for this question!


14)   A pressure relief valve can be

a. direct operated
b. pilot operated
c. solenoid operated
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: 2, 3 and 4

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: fluid pressure lifts the ball due to which reverse flow is possible

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: pressure reducing valve is connected between DCV and branch circuit while pressure relief valve is connected between pump and tank

Explanation:
No explanation is available for this question!


18)   Accumulator used in gas charged accumulator is

a. hydraulic
b. pneumatic
c. hydropneumatic
d. none of the above
Answer  Explanation 

ANSWER: hydropneumatic

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


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
Answer  Explanation 

ANSWER: more than input pressure

Explanation:
No explanation is available for this question!