Which of the following cycles is not a reversible cycle?

If a man cycles at 10 km/hr, then he arrives at a certain place at 1 pm. If he cycles at 15 km/hr, he will arrive at the same place at 11 am. At what speed must he cycles to get there at noon?

A

11 km/hr

B

12 km / hr

C

13 km / hr

D

14 km / hr

The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.

A

Isobaric

B

Isothermal

C

Adiabatic

D

None of these

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

A

More

B

Less

C

Equal

D

Depends on other factors

If a man cycles at 10 km/hr , then he arrives at a certain place at 1 pm . If he cycles at 15km/hr, arrive at the same place at 11am . At what speed must he cycels to get there at noon ?

A

11km/hr

B

12km/hr

C

13km/hr

D

14km/hr

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 substance should be same

C

When beat is being rejected, temperature of cold source and working substance should be same

D

All of the above

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A

Heat rejection is lower

B

Expansion and compression are isentropic

C

Combustion is at constant volume

D

Maximum temperature is higher

Which of the following processes can not be made reversible even under ideal condition of operation?

A

Free expansion of a gas

B

Compression of air in a compressor

C

Expansion of steam in a turbine

D

All of the above

Which of the following is not a reversible process ?

A

Expansion of an ideal gas against constant pressure

B

Atmospheric pressure vaporisation of water at 100°C

C

Solution of NaCl in water at 50°C

D

None of these

Which of the following is not reversible?

A

Joule effect

B

Peltier effect

C

Seebeck effect

D

Thomson effect

Which of the following is not correct for a reversible adiabatic process?

A

$${\text{T}}{{\text{V}}^{\gamma - 1}}$$ = constant

B

$${{\text{P}}^{1 - \gamma }}.{{\text{T}}^{\text{Y}}}$$ = constant

C

$${\text{P}}{{\text{V}}^\gamma }$$ = constant

D

None of these

Which of the following cycles is not a reversible cycle?

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