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Internal Combustion Engines

Internal Combustion Engines
Iso-octane (C₈H₁₈) has octane number of

0
50
100
120

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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
More
Less
May be more or less depending on engine capacity

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Internal Combustion Engines
The term scavenging is generally associated with

Aeroplane engines
2-stroke cycle engines
High efficiency engines
4-stroke cycle engines

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Internal Combustion Engines
The scavenging efficiency of a four stroke cycle diesel engine is

Between 95 and 100%
Between 85 and 95%
Below 50%
Between 50 and 85%

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Internal Combustion Engines
Stoichiometric ratio is

None of these
Chemically correct air-fuel ratio by weight
Actual air-fuel ratio for maximum efficiency
Chemically correct air-fuel ratio by volume

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Internal Combustion Engines
The self ignition temperature of petrol is _________ as compared to diesel oil.

Higher
None of these
Lower
Same

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