Entropy change depends on___________________?

A. Heat transfer
B. Mass transfer
C. Change of temperature
D. Thermodynamic state

A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?

A. 300 nm
B. 300,000 nm
C. 30 nm
D. 3000 nm

Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?

A. 0.75
B. 1
C. 1.27
D. 1.35

In order that a cycle be reversible, following must be satisfied ________________?

A. Free expansion or friction resisted expansion/compression process should not be encountered
B. When heat is being absorbed, temperature of hot source and working sub¬stance should be same
C. When beat is being rejected, temperature of cold source and working sub-stance should be same
D. All of the above

Which of the following processes are thermodynamically reversible___________________?

A. throttling
B. free expansion
C. constant volume and constant pressure
D. hyperbolic and pv = c

The specific heat of air increases with increase in __________________?

A. Temperature
B. Pressure
C. Both pressure and temperature
D. Variation of its constituents

In a free expansion process___________________?

A. Work done is zero
B. Heat transfer is zero
C. Both a. and b. above
D. Work done is zero but heat increases

The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?

A. 29.27 j/kmol°k
B. 83.14j/kmol°k
C. 848j/kmol°k
D. All j/kmol °k

On volume basis, air contains following parts of oxygen _____________________?

A. 21
B. 23
C. 25
D. 77

In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?

A. 100 xloo5 joules
B. Lxlo5 joules
C. 10 xlo5 joules
D. 10 xlo5 kilo joules