Engineering :: Heat Engines

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191.

The self-ignition temperature of diesel oil as compared to petrol is

192.

Apart from reducing friction and cooling the surfaces, the function of lubricant in I.C. engines is

A.	To improve thermal efficiency	B.	To clean the surfaces by carrying away the carbon and metal particles cansed by wear
C.	To reduce noise	D.	To reduce vibrations
E.	None of the above

193.

The level of oil in engine cylinder should be checked when the engine is

194.

For same compression ratio and same heat input

A.	Otto cycle is more efficient	B.	Diesel cycle is more efficient
C.	Both are equally efficient

195.

For the same peak pressure and heat input

A.	Otto cycle is more efficient	B.	Diesel cycle is more efficient
C.	Both are equally efficient

196.

Diesel engine has air fuel ratio of 30 ; 1 during idling. A petrol engine can also work on such mixture provided

A.	Engine is suitably modified	B.	Carburettor is modified
C.	Ignition timing is changed	D.	Dannot run as it is impossible
E.	Runs smoothly at lower speeds only

197.

In naturally aspirated engine the pressure inside cylinder at the end of suction stroke is

A.	Less than atmospheric	B.	Same as atmospheric
C.	More than atmospheric	D.	Depends on atmospheric conditions
E.	None of the above

198.

Morse test is conducted on

199.

Prony brake is used for testing of

A.	Small engines	B.	Large engines
C.	Engines having small flywheel	D.	Slow speed engines
E.	High speed engines

200.

Air standard efficiency of an I.C. engine depends on