# Hydraulic Elements in the Design of Circuits - MCQs with Answers

## Hydraulic Elements in the Design of Circuits – MCQs with Answers

1. 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

ANSWER: b. flow control valve can adjust the flow rate of hydraulic oil

2. 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

ANSWER: b. 4 ways and 2 positions

3. Which of the following circuits shows tandem connection?

a.

b.

c.

d.

4. 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

5. 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

ANSWER: b. pilot stage direction control valve

6. Check valve is a type of

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

7. A pressure relief valve can be

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

8. 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 the above

ANSWER: c. 2, 3 and 4

9. 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: b. fluid pressure lifts the ball due to which reverse flow is possible

10. 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: c. pressure reducing valve is connected between DCV and branch circuit while pressure relief valve is connected between pump and tank

11. Why are bleed off circuits used?

a. bleed off circuit is used to restrict the flow of fluid into the hydraulic cylinder
b. bleed off circuit is used to restrict the flow of fluid out of the hydraulic cylinder
c. bleed off circuits are used to reduce the speed of actuator
d. all the above

ANSWER: c. bleed off circuits are used to reduce the speed of actuator

12. Which of the following is applicable for bleed off circuits?

a. bleed off circuits develop heat in the system
b. bleed off circuits are used for resistive loads
c. bleed off circuits are used for runaway loads
d. all the above

13. What is the function of sequence valve used in hydraulic circuits?

a. sequence valves are used to perform number of operations one after the other after the set pressure is reached
b. sequence valves are used to perform number of operations continuously before the set pressure is reached
c. sequence valves after reaching set pressure oil is flown to the tank
d. all the above

ANSWER: a. sequence valves are used to perform number of operations one after the other after the set pressure is reached

14. When is a pressure reducing valve used?

a. it is used when higher pressure than system pressure is required
b. it is used when lower pressure than system pressure is required
c. when absolutely zero pressure is required
d. all the above