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Internal Combustion Engines

Internal Combustion Engines
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

Less
More or less depending on power rating
More
Same

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Internal Combustion Engines
Stoichiometric ratio is

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

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

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

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

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

100
120
50
0

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

50
120
100

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MORE MCQ ON Internal Combustion Engines

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