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441.

Dark, black smoke from diesel engines usually results when the engine is

A.	Idling	B.	Running at slow speeds
C.	Running at light loads	D.	Running at full speed but under no load conditions
E.	Running at full load and full speed

442.

Blue smoke from a diesel engine indicates the presence of

443.

Which of the following needs constant cleaning in a diesel engine?

444.

Which of the following pollutants result from automobile exhaust?

445.

The discharge of hydrocarbons from an automobile exhaust is minimum when the vehicle is

446.

The emission of carbon monoxide in automobile exhaust will be low when the vehicle is

447.

The phenomenon of hunting is associated with

448.

Speed drop is the

A.	Drop in engine speed	B.	Increasing in engine speed
C.	Reduction in engine speed from no loads to full load	D.	Change in engine speed while fuel supply remains the same
E.	None of the above

449.

Which of the following type of internal combustion engines uses rocker arms?

450.

The maximum horse power of a 150 CC scooter engine is around