# Machine Design Questions and Answers – Springs

This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Springs”.

1. Which of the following function can the spring perform?
a) Store energy
b) Absorb shock
c) Measure force
d) All of the mentioned

Explanation: Spring can easily perform all the listed functions.

2. The helix angle is very small about 2⁰. The spring is open coiled spring.
a) Yes
b) It is closed coiled spring
c) That small angle isn’t possible
d) None of the listed

Explanation: When the helix angle is small, the plane containing each coil is almost at right angles and hence it is called closed coiled spring.

3. The helical spring ad wire of helical torsion spring, both are subjected to torsional shear stresses.
a) True
b) False

Explanation: The wire of helical torsion sprig is subjected to bending stresses.

4. The longest leaf in a leaf spring is called centre leaf.
a) It is called middle leaf
b) It is called master leaf
c) Yes
d) None of the listed

Explanation: It is called master leaf.

5. Multi leaf springs are not recommended for automobile and rail road suspensions.
a) True
b) False

Explanation: They are highly used in automobile and rail road suspensions.
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6. The spring index is the ratio of wire diameter to mean coil diameter.
a) True
b) False

Explanation: It is the ratio of mean coil diameter to wire diameter.

7. If spring index=2.5, what can be concluded about stresses in the wire?
a) They are high
b) They are negligible
c) They are moderate
d) Cannot be determined

Explanation: If indexis <3 then stresses are high due to curvature effect.

8. A spring with index=15 is prone to buckling.
a) True
b) False

Explanation: Due to large variation, such a spring is prone to buckling.

9. If the spring is compressed completely and the adjacent coils touch each other,the the length of spring is called as?
a) Solid length
b) Compressed length
c) Free length
d) None of the mentioned

Explanation: Terminology.

10. If number of coils are 8 and wire diameter of spring 3mm, then solid length is given by?
a) None of the listed
b) 27mm
c) 24mm
d) 21mm

Explanation: Solid length=8×3.

11. Compressed length is smaller than the solid length.
a) True
b) False

Explanation: Compressed is length of spring under maximum compressive force. There is some gap between the coils under maximum load.

12. Pitch of coil is defined as axial distance in compressed state of the coil.
a) Yes
b) It is measured in uncompressed state
c) It is same in uncompressed or compressed state
d) None of the listed

Explanation: Pitch is measured in uncompressed state.

13. If uncompressed length of spring is 40mm and number of coils 10mm, then pitch of coil is?
a) 4
b) 40/9
c) 40/11
d) None of the mentioned

Explanation: Pitch=Uncompressed length/N-1.

14. Active and inactive, both types of coils support the load although both don’t participate in spring action.
a) Active coils don’t support the load
b) Inactive coils don’t support the load
c) Both active and inactive don’t support the load
d) Both active and inactive support the load

Explanation: Inactive coils don’t support the load.

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