250+ TOP MCQs on Design of IC Engine Components and Answers

Machine Design Multiple Choice Questions on “Design of IC Engine Components”.

1. Compression Ratio in diesel engine is lesser than that in Spark Ignition engine.
a) True
b) No
c) They are equal
d) Doesn’t matter
Answer: b
Clarification: In diesel engine, there is no spark to ignite, charge is compressed to greater extent to support self-ignition.

2. Petrol engine are more economical than diesel engine.
a) True
b) False
Answer: b
Clarification: Diesel engine have better thermal efficiency and hence are more economical.

3. There are ____ types of liners.
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: Dry liners and wet liners.

4. If no re boring allowance is to be given, then thickness of cylinder wall is max pressure is 3.5N/mm², bore diameter=200mm and permissible tensile stress is 40N/mm².
a) 7mm
b) 8mm
c) 9mm
d) 10mm
Answer: c
Clarification: t=pD/2σ=8.75mm.

5. If diameter of cylinder of bore is 120mm, then thickness of the cylinder will be
a) Information not sufficient
b) 7mm
c) 12mm
d) 6mm
Answer: b
Clarification: t=0.045D + 1.6.

6. If diameter of cylinder bore is 120mm, then thickness of dry liner will be
a) 2.2mm
b) 3.6mm
c) 4.8mm
d) 6mm
Answer: b
Clarification: t= 0.03D to 0.035D.

7. If diameter of cylinder bore is 120mm, then thickness of water jacket wall will be
a) 4.26mm
b) 5.25mm
c) 2.56mm
d) All of the listed
Answer: d
Clarification: p=t/3 to 3t/4, where t= thickness of cylinder wall=7mm.

8. If diameter of cylinder bore is 120mm, then thickness of water cylinder flange will be
a) 8.8mm
b) 10.2mm
c) 7.8mm
d) 12mm
Answer: a
Clarification: q=1.2t to 1.4t.

9. If nominal diameter of bolt used is 20mm, then find the radial distance between outer diameter of flange and pitch circle diameter of studs.
a) 24mm
b) 28mm
c) 32mm
d) 36mm
Answer: b
Clarification: r=d+6 to 1.5d i.e. 26mm to 30mm.

10. The circumferential hoop stress and longitudinal stress are both shear stress.
a) True
b) False
Answer: b
Clarification: They both are tensile stress.

11. The circumferential hoop stress and longitudinal stress act in same direction and hence are straight away added.
a) True
b) False
Answer: b
Clarification: They both act perpendicularly to each other and thus net stress in these directions is reduced.