# MCQs on Design of IC Engine Components

1 - Question

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

Explanation: In diesel engine, there is no spark to ignite, charge is compressed to greater extent to support self-ignition.

2 - Question

Petrol engine are more economical than diesel engine.

a) True
b) False

Explanation: Diesel engine have better thermal efficiency and hence are more economical.

3 - Question

There are ____ types of liners.

a) 1
b) 2
c) 3
d) 4

Explanation: Dry liners and wet liners.

4 - Question

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

Explanation: t=pD/2σ=8.75mm.

5 - Question

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

Explanation: t=0.045D + 1.6.

6 - Question

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

Explanation: t= 0.03D to 0.035D.

7 - Question

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

Explanation: p=t/3 to 3t/4, where t= thickness of cylinder wall=7mm.

8 - Question

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

Explanation: q=1.2t to 1.4t.

9 - Question

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

Explanation: r=d+6 to 1.5d i.e. 26mm to 30mm.

10 - Question

The circumferential hoop stress and longitudinal stress are both shear stress.

a) True
b) False

Explanation: They both are tensile stress.

11 - Question

The circumferential hoop stress and longitudinal stress act in same direction and hence are straight away added.

a) True
b) False