# Automotive Engine Components Design Questions and Answers – IC Engine – Stresses in Cylinder Wall

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This set of Automotive Engine Components Design Multiple Choice Questions & Answers (MCQs) focuses on “IC Engine – Stresses in Cylinder Wall”.

1. Longitudinal stress doesn’t act on the cylinder.
a) True
b) False

Explanation: Circumferential hoop stress and the longitudinal stress are the two principal stresses that act on the engine cylinder. So, longitudinal stress act on the cylinder.

2. Calculate the net circumferential stress when σc=20N/mm2, σI=11N/mm2 and μ=0.2.
a) 17.8N/mm2
b) 16.5N/mm2
c) 16.5N/m2
d) 16.3N/mm3

Explanation: (σc)netc-μσI
=20-0.2×11
=17.8N/mm2

3. Calculate the net longitudinal stress σc=20N/mm2, σI=11N/mm2 and μ=0.2
a) 6N/mm2
b) 7N/mm2
c) 8N/mm2
d) 9N/mm2

Explanation: (σI)netI-μσc
=11-0.2×20
=7N/mm2

4. Calculate the net minimum outer diameter of the cylinder, when the inner diameter of the cylinder is 140mm and thickness is 11mm.
a) 153mm
b) 170mm
c) 160mm
d) 162mm

Explanation: D0=D+2t
=140+2(11)
=162mm

5. Calculate the thickness of the cylinder when Pmax=3MPa, D=150mm, C=4and σc=45N/mm2.
a) 9mm
b) 6mm
c) 7mm
d) 8mm

Explanation: t=$$\frac{P_{max}\times D}{2\sigma}$$+C
=$$\frac{3×150}{2×45}+4$$
=5+4
=9mm

6. Calculate the apparent circumferential stress, when Pmax=3.5MPa, D=140mm, and t=8mm?
a) 12.3N/mm2
b) 14.4N/mm2
c) 15.3N/mm2
d) 16.1N/mm2

Explanation: σ c=$$\frac{P_{max}D}{2t}$$
=$$\frac{3.5×140}{2×16}$$
=15.3N/mm2

7. Calculate the apparent longitudinal stress when Do=162mm, D=140mm, Pmax=3MPa.
a) 8.85N/mm2
b) 9.32N/mm2
c) 6.66N/mm2
d) 7.65N/mm2

Explanation: σI=$$\frac{P_{max}D^2}{Do^2-D^2}$$
=$$\frac{3×140^2}{(162^2×140^2)}$$
=8.85N/mm2

8. In the formula (σI)netI-μσc, what is µ?
a) Yield point
b) Hoop constant
c) Stress constant
d) Poisson’s ratio

Explanation: μ is Poisson’s ratio, it is the ratio of transverse contraction strain to the longitudinal extension strain. σI is the longitudinal stress and σc is the circumferential stress.

Sanfoundry Global Education & Learning Series – Automotive Engine Components Design. 