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Engineering Thermodynamics

Engineering Thermodynamics
The polytropic index (n) is given by

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

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

Greater than
Equal to
None of these
Less than

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Engineering Thermodynamics
When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency

2
43835
43834
Zero

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Engineering Thermodynamics
According to kinetic theory of gases, the absolute zero temperature is attained when

Volume of the gas is zero
Specific heat of gas is zero
Kinetic energy of the molecules is zero
Pressure of the gas is zero

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Engineering Thermodynamics
The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when

Process is isothermal
Process is isentropic and specific heat does not change with temperature
Process is isentropic
Flow is uniform and steady

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Engineering Thermodynamics
Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant

Temperature
Internal energy
Pressure
Volume

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MORE MCQ ON Engineering Thermodynamics

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