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Internal Combustion Engines

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

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

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Internal Combustion Engines
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

1
0.25
0.5
0.7

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Internal Combustion Engines
A petrol engine, during suction stroke draws

A mixture of petrol and air
Air only
None of these
Petrol only

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

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

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Internal Combustion Engines
Thermal efficiency of a two stroke cycle engine is ___ a four stroke cycle engine.

Equal to
Greater than
None of the listed here
Less than

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Internal Combustion Engines
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed

240°C
80°C
120°C
180°C

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