The ratio of the indicated thermal efficiency to the air standard efficiency is known as

Engine pistons are usually made of aluminium alloy because it

A. Is lighter

B. Wear is less

C. Absorbs shocks

D. Is stronger

The reason for supercharging in any engine is to

A. Increase efficiency

B. Increase power

C. Reduce weight and bulk for a given output

D. Effect fuel economy

Morse test can be conducted for

A. Petrol engines

B. Diesel engines

C. Multi cylinder engines

D. All of these

The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of

B. 50

C. 100

D. 120