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Engineering Thermodynamics

Engineering Thermodynamics
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.

Greater than
None of these
Less than
Equal to

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Engineering Thermodynamics
Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to

Vr
J²
T
J

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Engineering Thermodynamics
When the gas is heated at constant volume, the heat supplied

None of these
Both (A) and (B)
Does some external work during expansion
Increases the internal energy of the gas and increases the temperature of the gas

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Engineering Thermodynamics
A heat exchange process in which the product of pressure and volume remains constant is known as

Throttling process
Hyperbolic process
Heat exchange process
Isentropic process

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Engineering Thermodynamics
The compression ratio for petrol engines is

5 to 8
3 to 6
15 to 30
10 to 20

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Engineering Thermodynamics
The polytropic index (n) is given by

log (p2/ p1)/log (v1/ v2)
log (v1/ v2)/ log (p1/p2)
log (p1p2)/log (v1v2)
log [(p1v1)/(p2v2)]

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