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Internal Combustion Engines

Internal Combustion Engines
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of

1000°C
2000°C
250°C
500°C

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Internal Combustion Engines
The knocking tendency in spark ignition engines may be decreased by

Controlling the exhaust temperature
Controlling the air-fuel mixture
Reducing the compression ratio
Controlling the ignition timing

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Internal Combustion Engines
The knock in diesel engine occurs due to

Reduction of delay period
Delayed burning of the first part of the charge
Instantaneous auto ignition of last part of charge
Instantaneous and rapid burning of the first part of the charge

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Internal Combustion Engines
The correct mixture strength (by weight) for petrol is about

14.6 : 1
22.6 : 1
20.4 : 1
18.5 : 1

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Internal Combustion Engines
The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of

0
50
120
100

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Internal Combustion Engines
The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is

Same
Less
More
May be more or less depending on engine capacity

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MORE MCQ ON Internal Combustion Engines

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