365. The knock in diesel engine occurs due to
A.Instantaneous And Rapid Burning Of The First Part Of The Charge
B.Instantaneous Auto Ignition Of Last Part Of Charge
C.Delayed Burning Of The First Part Of The Charge
D.Reduction Of Delay Period

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366. The air-fuel ratio in petrol engines-is controlled by
A.Controlling Valve Opening/Closing
B.Governing
C.Injection
D.Carburettion

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367. Volatility of diesel fuel oil is
A.Minimum Temperature To Which Oil Is Heated In Order To Give Off Inflammable Vapours In Sufficient Quantity To Ignite Momentarily When Brought In Contact With A Flame
B.Temperature At Which It Solidifies or Congeals
C.It Catches Fire Without External Aid
D.Indicated By 90% Distillation Temperature, i.e., When 90% Of Sample Oil Has Distilled Off

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368. Which is more viscous lub oil
A.SEA 30
B.SEA 40
C.SEA 80
D.SEA 70

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369. A stoichiometric air-fuel ratio is
A.Chemically Correct Mixture
B.Lean Mixture
C.Rich Mixture For Idling
D.Rich Mixture For Over Loads

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370. In a naturally aspirated diesel engine, the air is supplied by
A.A Supercharger
B.A Centrifugal Blower
C.A Vacuum Chamber
D.An Injection Tube

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371. In loop scavenging, the top of the piston is
A.Flat
B.Contoured
C.Slanted
D.Depressed

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