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Internal Combustion Engines

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

Wear is less
Is lighter
Absorbs shocks
Is stronger

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Internal Combustion Engines
A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

75% iso-octane and 25% normal heptane
75% diesel and 25% petrol
75% petrol and 25% diesel
75% normal heptane and 25% iso-octane

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Internal Combustion Engines
The fuel in diesel engine is normally injected at pressure of

60-80 kg/cm²
5-10 kg/cm²
90-130 kg/cm²
20-25 kg/cm²

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Internal Combustion Engines
An hmh flame speed is obtained in diesel engine when air fuel ratio is

About 10% of rich mixture
About 35% of rich mixture
Uniform throughout the mixture
Chemically correct mixture

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

100
0
120
50

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Internal Combustion Engines
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be

None of the listed here
Higher
Remain unaffected
Lower

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MORE MCQ ON Internal Combustion Engines

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