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481.

The maximum amount of dissociation occurs in the burnt gases of a

A.	weak fuel mixture	B.	chernically correct mixture
C.	rich fuel mixture	D.	lean mixture

482.

The frictional horse power of a well adjusted petrol engine should be nearly

A.	10%	B.	25%
C.	40%	D.	50%

483.

A negative loop in the P-V diagram of a petrol engine is due to

A.	pre-ignition	B.	detonation
C.	Suction of air	D.	early opening of exnaust valve

484.

In all a four stroke four cylinder engine will have how many valves?

A.	4	B.	8
C.	16	D.	none

485.

In a petrol engine the mixture strength for maximum power is

A.	1 ; 5	B.	1 ; 13
C.	1 ; 23	D.	1 ; 30

486.

Which locomotives has the highest unbalanced forces?

A.	Electric locomotives	B.	Diesel locomotives
C.	Steam locomotives

487.

Maintenance requirements are least in case of

A.	Electric locomotives	B.	Diesel locomotives
C.	Steam locomotives

488.

Suri-transmission is

A.	hydro-mechanical	B.	hydro-pneumatic
C.	mechanical-electrical	D.	electro-pneumatic

489.

The overload capacity of diesel engine is usually around

A.	1%	B.	10%
C.	25%	D.	50%

490.

The effieincy of a diesel cycle increases with

A.	increase in cut off	B.	decrease in cut off
C.	decrease in compression ratio	D.	None of the above