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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
Same
More

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Internal Combustion Engines
The knocking tendency in compression ignition engines for a given fuel will be

None of these
Enhanced by decreasing compression ratio
Enhanced by increasing compression ratio
Dependent on other factors

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

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

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Internal Combustion Engines
The ratio of the brake power to the indicated power is called

Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Volumetric efficiency

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Internal Combustion Engines
The correct mixture strength (by weight) for petrol is about

22.6 : 1
14.6 : 1
18.5 : 1
20.4 : 1

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Internal Combustion Engines
Which of the following is false statement?Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following

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

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