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461.

In order to reduce wear and eliminate scuffing, piston ring in internal combustion engines are

A.	Made of square section	B.	Provided with grooves
C.	Plated with chromium, cadmium or phosphate	D.	Lubricated thoroughly
E.	Made of soft material

462.

Ricardo's theory is associated with

A.	Steam turbines	B.	Wankel engines
C.	Closed cycle gas turbines	D.	Engine vibrations
E.	Internal combustion engines

463.

Freezing point of petrol is around

464.

The sulphur content in diesel oil should not exceed

465.

Which of the following engine can work on very lean mixture?

466.

If petrol is supplied to a diesel engine

A.	The engine will explode	B.	The engine will not run
C.	The engine will run with high knocking	D.	The engine will run at high speeds
E.	The engine will run with excessive vibrations

467.

Which of the following exists as highest pressure in a diesel engine

A.	Air during suction	B.	Air at the end of compression stroke
C.	Exhaust gases in silencer	D.	Lubricating oil
E.	Fuel at the time of injection

468.

Which of the following has the lowest pressure in a petrol engine?

A.	Mixture at the beginning of suction stroke	B.	Mixture at the end of suction stroke
C.	Mixture at the end of compression stroke	D.	Gases during power stroke
E.	Gases during exhaust stroke

469.

Which of the following is not used as ignition accelerator for diesel engine fuel?

470.

Normally the colour of exhaust from a diesel engine is