# Design of Pneumatic Circuits - MCQs with Answers

## Design of Pneumatic Circuits – MCQs with Answers

1. 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

2. 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

3. Which of the following logic valve is known as shuttle valve?

a. OR gate
b. AND gate
c. NOR gate
d. NAND

4. In pneumatic systems, AND gate is also known as

a. check valve
b. shuttle valve
c. dual pressure valve
d. none of the above

5. 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

ANSWER: a. it is a combination of adjustable pressure relief valve and directional control valve

6. What is the difference between signal air and control air?

a. signal air actuates final control valve and control air flows to the cylinder through the final control valve for forward and backward movement of piston rod

b. control air actuates final control valve and signal air flows to the cylinder through the final control valve for forward and backward movement of piston rod

c. both a and b

d. none of the above

ANSWER: a. signal air actuates final control valve and control air flows to the cylinder through the final control valve for forward and backward movement of piston rod

7. Which of the following is used to sense the initial and final positions of a piston rod?

a. lever operated direction control valve
b. limit switch
c. roller lever valve
d. all the above

8. Which valve gets activated only in one direction that is forward or backward movement of the piston rod?

a. roller lever valve
b. idle roller lever valve
c. both a and b
d. none of the above

ANSWER: b. idle roller lever valve

9. Which numbers are used to denote retraction of a piston rod?

a. even numbers
b. odd numbers
c. both even and odd numbers
d. none of the above

10. Which of the following is an element of time delay valve?

a. flow control valve
b. direction control valve
c. both a and b
d. none of the above

ANSWER: c. both a and b