1. Exhaust valve temperature is about
a) 35-degree celsius
b) 100 degree celsius
c) 150 degree celsius
d) 500 degree celsius

Answer: d
Explanation: The temperature of the exhaust valve is of the order of 500 degree celsius

2. The size of the engine intake valve is
a) Same as that of exhaust valve
b) Smaller than that of exhaust valve
c) Larger than that of exhaust valve
d) Does not depend upon the size of exhaust valve

Answer: b
Explanation: The exhaust valve is made bigger in size than the intake valve.

3. The device used to measure the clearance between the valve and tappet of an IC Engine is
a) Feeler gauge
b) Snap gauge
c) Slip gauge
d) Micrometer

Answer: a
Explanation: A Feeler gauge is used to measure the clearance.

4. The purpose of valve clearance is to
a) Allow the valve to expand
b) Allow the sliding of valve in the guide
c) Ensure that the valve closes fully
d) Ensure that the crankshaft is free to rotate

Answer: c
Explanation: Valve clearance ensures that valve closes completely.

5. The opening and closing of a valve is respectively done by
a) A cam and a spring
b) A spring and a cam
c) Gas pressure and cam
d) Cylinder vacuum and spring

Answer: a
Explanation: An engine valve is opened by a cam and closed by a spring.

6. On modern four stroke engines the exhaust valve opens just
a) Before TDC
b) After TDC
c) Before BDC
d) After BDC

Answer: c
Explanation: Exhaust valve opens before the piston reaches Bottom Dead Centre.

7. A relief valve is fitted to the main oil gallery of an engine. The purpose of this valve is to
a) Limit the maximum oil pressure
b) Open when the oil is hot
c) Maintain the supply if the gallery becomes blocked
d) Stop the oil flow to the bearings

Answer: A relief valve limits the maximum oil pressure.

8. _________ serve as a support and enclosure for moving parts.
a) cylinder block
b) cylinder head
c) crank case
d) connecting rod
View Answer

Answer: a
Explanation: Because cylinder block is outer body of the engine which encloses all other parts like piston, connecting rod etc.

9. In modern engines cylinder block and crank case forms a single casting because _________
a) reduces space consumption
b) rigid structure
c) wearing properties
d) can withstand high temperature

Answer: b
Explanation: Cylinder block and crank case are made of single casting to make them a rigid structure since they should withstand high temperature and to have good wear properties.

10. _______ are cast in crankcase to give extra strength and to support camshaft bearings.
a) rocker arm
b) oil filter
c) rims
d) manifolds

Answer: c
Explanation: Since rims forms/gives an outer layer for crankcase they are used besides they too have high wear properties.