250+ TOP MCQs on Various Parts of Engine – 2 and Answers

Automobile Engineering MCQs on “Various Parts of Engine – 2”.

1. What is the material of the connecting rod?
a) Mild steel
b) Forged steel
c) Tool steel
d) Cast iron

Answer: b
Clarification: Connecting rod is made of forged steel because the connecting rod should have light weight and high resistance. Connecting rod in the engine should be lightweight because it provides proper balance to the engine and it should have high strength because it goes through cyclic stress.

2. Which of the following item is made of aluminium alloy?
a) Piston ring
b) Piston
c) Connecting rod
d) Crankshaft

Answer: b
Clarification: Aluminium alloy is used in making piston. Aluminium alloys are used for the piston because it provides high resistance to the temperature. Since, the piston faces the highest temperature it must have the highest temperature resistance.

3. Piston pin is also known as ________
a) Gudgeon pin
b) Crank pin
c) Screw pin
d) None of the mentioned

Answer: a
Clarification: Piston pin is also called as gudgeon pin.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.

4. Compression rings are fitted at the _________
a) Middle of skirt
b) Bottom of skirt
c) Top of skirt
d) None of the mentioned

Answer: c
Clarification: Compression rings are located at the top of skirt.

5. Piston rings are not completely closed because __________
a) Closed rings are hard to manufacture
b) Gap allows the ring to expand and fit over
c) They are designed to let pass some lubricant to the combustion chamber
d) None of the mentioned

Answer: b
Clarification: Piston rings expand due to heat of combustion and fit over.

6. The entrance of the piston pin hole is sealed by ____________
a) Steel plating
b) Snap ring
c) Rubber ring
d) None of the mentioned

Answer: b
Clarification: Snap rings are used to seal the entrance.

7. Compression rings have which type of cross section __________
a) Rectangular
b) L shaped
c) Keystone
d) All of the mentioned

Answer: d
Clarification: All the given are types of Compression ring cross sections.

8. Passenger car engines contain ____________
a) 2 compression ring and 1 oil control ring
b) 2 compression ring and 2 oil control ring
c) 1 compression ring and 1 oil control ring
d) 2 compression ring and no oil control ring

Answer: a
Clarification: These type of engines contain 2 compression ring and 1 oil control ring.

9. The function of a piston is ____________
a) It forms a movable wall of combustion chamber
b) It transmits turning force to the crankshaft via connecting rod
c) It functions like crosshead and transmits side thrusts
d) All of the mentioned

Answer: d
Clarification: A piston performs all the above mentioned functions.

10. If the diameter of a piston is ‘D’ then the length of skirt is usually of the range of ___________
a) 0.75D to 0.8D
b) 0.5D to D
c) 1.5D to 2D
d) 0.2D to 0.6D

Answer: a
Clarification: The length of the skirt is usually 0.75 to 0.8 times the diameter of the piston.

11. The plate which acts as a packing between cylinder block and cylinder head is called ________
a) Chaplet
b) Liner
c) Gasket
d) Flange

Answer: c
Clarification: Gasket forms the packing between cylinder block and cylinder head.

12. Which one of the following is a type of Gasket?
a) Copper asbestos
b) Steel asbestos
c) Single sheet rigid
d) All of the mentioned

Answer: d
Clarification: All the three are various types of gaskets.