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Internal Combustion Engines

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

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

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Internal Combustion Engines
For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

0.75069444444444
0.37569444444444
0.62569444444444
0.50069444444444

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Internal Combustion Engines
Engine pistons are usually made of aluminium alloy because it

Is lighter
Absorbs shocks
Is stronger
Wear is less

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Internal Combustion Engines
Which of the following is false statement?

Detonation
Oil sludge in the engine crank case
Piston ring and cylinder wear
Formation of hard coating on piston skirts

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Internal Combustion Engines
The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

None of these
Not effect
Reduce
Increase

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Internal Combustion Engines
The pressure at the end of compression, in diesel engines, is approximately

25 bar
20 bar
10 bar
35 bar

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