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Internal Combustion Engines

Internal Combustion Engines
The mechanical efficiency (ηm) of the engine is given by

ηm = (B.P × I.P)/100
None of these
ηm = I.P/B.P
ηm = B.P/I.P

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

Mechanical efficiency
Volumetric efficiency
Indicated thermal efficiency
Overall efficiency

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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

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

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Internal Combustion Engines
The knock in diesel engine occurs due to

Delayed burning of the first part of the charge
Instantaneous and rapid burning of the first part of the charge
Instantaneous auto ignition of last part of charge
Reduction of delay period

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Internal Combustion Engines
The increase of cooling water temperature in petrol engine will _________ the knocking tendency.

Decrease
Increase
None of these
Not effect

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Internal Combustion Engines
Which of the following is not an intern’s combustion engine?

Steam turbine
Diesel engine
4-stroke petrol engine
2-stroke petrol engine

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