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Engineering Thermodynamics

Engineering Thermodynamics
The entropy __________ in an irreversible cyclic process.

None of these
Increases
Decreases
Remains constant

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Engineering Thermodynamics
Carnot cycle efficiency is maximum when

Difference between initial and final temperature is 0°K
Initial temperature is 0°K
Final temperature is 0°C
Final temperature is 0°K

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Engineering Thermodynamics
The compression ratio for Diesel engines is

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

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Engineering Thermodynamics
The isothermal and adiabatic processes are regarded as

None of the listed here
Reversible or irreversible process
Reversible process
Irreversible process

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Engineering Thermodynamics
The polytropic index (n) is given by

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

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Engineering Thermodynamics
For same compression ratio and for same heat added

Both Otto and Diesel cycles are equally efficient
Otto cycle is more efficient than Diesel cycle
Efficiency depends on other factors
Diesel cycle is more efficient than Otto cycle

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