Automobile Engg

The portion of a crankshaft which rests on cylinder block is called main journal.

• Yes

• No

The size of the engine intake valve is

• Same as that of exhaust valve

• Smaller than that of exhaust valve

• Larger than that of exhaust valve

• Does not depend upon the size of exhaust valve

The device used to measure the clearance between the valve and tappet of an IC Engine is

• Feeler gauge

• Slip gauge

• Micrometer

• snap guage

By which relation speed of piston can be calculated inside cylinder block?

(L-Length of stoke, D-Diameter, N-speed of engine)

• 2LDN

• 2LN

• 2πLD

• 2πL

The torque available at the contact between driving wheels and road is known as

• brake effort

• clutch effort

• tractive effort

• none of these

The vehicle ride will be comfortable if

• unsprung mass is kept minimum

• sprang mass is kept minimum

• vehicle mass is kept minimum

• all of these

The effect of having excess camber is

• excessive steering alignment torque

• hard steering

• too much traction

• uneven tyre wear

If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

• 17:1

• 15:1

• 13:1

• 10:1

The co-efficient of rolling resistance for a truck weighing 63 500 N is 0.018. The rolling resistance to the truck is

• 1.143 N

• 11.43 N

• 114.3 N

• 1143 N

For idling condition in automotive engines, the air-fuel mixture must be

• lean

• rich

• chemically balanced

• none of the mentioned