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Internal Combustion Engines

Internal Combustion Engines
A mixture containing 65% of iso-octane and 35% of normal heptane will have

Cetane number 65
Cetane number 35
Octane number 35
Octane number 65

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Internal Combustion Engines
In petrol engines, advancing of the spark timing will ___ the knocking tendency.

None of the listed here
Increase
Not effect
Decrease

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Internal Combustion Engines
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

12-20 kg/cm² and 350-450°C
20-30 kg/cm² and 450-500°C
6-12 kg/cm² and 250-350°C
4-6 kg/cm² and 200-250°C

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Internal Combustion Engines
In diesel engine, the compression ratio in comparison to expansion ratio is

Variable
Less
More
Same

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Internal Combustion Engines
Which of the following does not relate to a compression ignition engine?

Governor
Carburettor
Fuel injector
Fuel pump

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Internal Combustion Engines
Which of the following medium is compressed in a Diesel engine cylinder?

Fuel alone
Air and fuel
Air alone
Air and lub oil

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