250+ TOP MCQs on Various Parts of Engine – 1 and Answers

Automobile Engineering Quiz on “Various Parts of Engine – 1”.

1. The function of crankcase in two stroke petrol engines is _________
a) It lower downs the temperature
b) It forms a pressurised chamber for fuel air mixture
c) It holds the exhaust gases after combustion
d) None of the mentioned

Answer: b
Clarification: The crankcase of a two stroke engine forms a pressurised air fuel mixture for combustion. It also prevents the atmospheric air or other particles from entering into the chamber.

2. In general, What type of section is used for connecting rods?
a) Forged I-section
b) Forged round section
c) Cast iron square section
d) Forged square section steel

Answer: a
Clarification: Connecting rods are generally of forged I-section type because I-section have higher modulus per unit area in comparison to other sections. I-section is highly resistant to buckling and bending.

3. The purpose of crankcase ventilation is to __________
a) Cool the oil
b) Remove vaporised water and fuel
c) Supply oxygen to the crankcase
d) It assists in maintaining the viscosity of oil

Answer: b
Clarification: Crankcase ventilation removes vaporised water and fuel.

4. The escape of burned gases from the combustion chamber past the pistons and into the crankcase is called _______
a) Gas loss
b) Blow by
c) By pass
d) Passed gas

Answer: b
Clarification: Blow by is the surging of burned gases from combustion chamber into the crankcase.

5. Connecting rod is attached to the piston by the ___________
a) Rod cap
b) Piston pin
c) Cap bolt
d) Lower cap

Answer: b
Clarification: Connecting rod is attached to the piston by piston pin.

6. Engine pistons are generally made of aluminium alloy because ______
a) It is lighter
b) It is stronger
c) It has less wear
d) It absorbs shock

Answer: a
Clarification: Aluminium alloy are used because they are lighter.

7. Piston compression rings are made of _____________
a) Cast iron
b) Steel
c) Aluminium
d) Bronze

Answer: a
Clarification: Cast iron is used for piston compression rings.

8. What type of material is used for Gudgeon pin?
a) Cast iron
b) Aluminium
c) Steel alloy of high strength
d) Hardened and ground steel

Answer: c
Clarification: Gudgeon pins are made of steel alloy of high strength. Gudgeon pins are short hollow pipes. Steel alloy of high strength are used for this pin because it should be very light and also have very high strength and temperature resistance.

9. The purpose of a piston pin is that _________
a) It prevents the valve from rotating
b) It links the connecting rod to the crankshaft
c) It ensure the piston ring to the piston
d) It connect the piston to the connecting rod

Answer: d
Clarification: Piston pin connects the piston to the connecting rod.

10. When no.1 piston of a four cylinder in line four stroke engine is performing the power stroke, no.4 piston is on the stroke called _______
a) Suction
b) Compression
c) Power
d) Exhaust

Answer: a
Clarification: When no.1 piston is on power stroke, no.4 piston will be on suction stroke.

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