# Automotive Engine Components Design Questions and Answers – IC Engine – Valve Spring Design

This set of Automotive Engine Components Design Multiple Choice Questions & Answers (MCQs) focuses on “IC Engine – Valve Spring Design”.

1. The purpose of the valve spring is to exert force on which part?
a) Rocker arm
b) Tappet
c) Roller
d) Cam

Explanation: Piston and Cylinder liner are held very close together such that the clearance between them can be neglected and the purpose of the valve spring is to exert force on the rocker arm.

2. When valves are closed which pressure is built inside the cylinder?
a) Neutral pressure
b) Positive pressure
c) Negative pressure
d) Zero pressure

Explanation: The purpose of the valve spring is to exert force on the rocker arm and When valves are closed negative pressure is built inside the engine cylinder.

3. Calculate the mean coil diameter when C=8 and d=6?
a) 1.33mm
b) 48mm
c) 14mm
d) 2mm

Explanation: D=Cd
= 8×6
= 48mm

4. Calculate the total number of turns for a square and ground end when N=13?
a) 15
b) 13
c) 32
d) 10

Explanation: N1=N+2
= 13+2
= 15

5. Calculate the free length of the spring when the solid length is 90mm and δmax=35.75mm?
a) 145.9mm
b) 69.65mm
c) 656mm
d) 131.11mm

Explanation: Free length= solid length+δmax+0.15δmax
=90+35.75+0.15(35.75)
= 131.11mm
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6. Calculate the solid length of the spring, when Nt=15mm and d=6mm.
a) 70mm
b) 90mm
c) 21mm
d) 9mm

Explanation: Solid length= Ltd
= 15×6
= 90mm

7. Calculate the pitch of the coil when the free length is 131.11mm and N1 is 15mm?
a) 29.6mm
b) 9.37mm
c) 20mm
d) 12.3mm

Explanation: Pitch of coils=$$\frac{Free \, length}{(Nt-1)}$$
=$$\frac{131.11}{(15-1)}$$
= 9.37mm

8. Calculate the maximum force on the spring Pmax when Pi=88.36N, K=10 and d=25mm.
a) 338.36N
b) 288.36N
c) 135.36N
d) 282.36N

Explanation: Pmax=Pi+Kd
=88.36+10(25)
=338.36N

9. Calculate the width of the flange, when thickness=8.
a) 30mm
b) 20mm
c) 10mm
d) 40mm

Explanation: Width of flange=2.5t
= 2.5(8)
=20mm

10. Calculate the depth of the section when t=8mm.
a) 88mm
b) 38mm
c) 48mm
d) 127mm

Explanation:Depth of section=6t
=6×8
=48mm

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