The efficiency of Carnot cycle depends upon

If Stirling cycle with regenerative arrangement and Carnot cycle operate within same temperature limits, then the thermal efficiency of Carnot cycle will be ___________

A

same

B

half

C

twice

D

none of the mentioned

The cycle of evaporation and rain in nature can be assumed to be a kind of Carnot cycle. If ocean water instead of evaporation are boiled by the heat of Sun at a constant temperature of 100 deg C and the condensation of steam into water droplets within the clouds occur at constant temperature of -20 deg C. Find the thermal efficiency of Carnot cycle of nature?

A

0.2777

B

0.3030

C

0.3333

D

0.50

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 Carnot cycle has maximum possible thermal efficiency, then why don’t the steam turbine power plants run on Carnot cycle?

A

Because boiler can’t be maintained at constant pressure in Carnot cycle

B

Since work consumed by compressor is approximately equal to work produced by turbine

C

As mean temperature of heat addition is quite low in case of Carnot cycle

D

Because the process of heat addition is at constant temperature

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

A

more

B

less

C

equal

D

none of the mentioned

Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

A

1.25

B

0.8

C

0.5

D

0.25

Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle 4. Diesel cycle 5. Brayton cycle

A

P – S – 5, R – U – 3, P – S – 1, Q – T - 2

B

P – S – 1, R – U – 3, P – S – 4, P – T - 2

C

R – T – 3, P – S – 1, P – T – 4, Q – S - 5

D

P – T – 4, R – S – 3, P – S – 1, P – S - 5

Consider the following statements: 1. The air standard efficiency of an Otto cycle is a function of the properties of the working substance (gas) 2. For the same compression ratio and same input, the thermal efficiency of an Otto cycle is more than that of a Diesel cycle 3. Thermal efficiency of a Diesel cycle increases with decrease of cut-off ratio Which of the above statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Carnot cycle efficiency depends upon

A

Properties of the medium/substance used

B

Condition of engine

C

Working condition

D

Temperature range of operation

Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the

A

Two temperatures only

B

Pressure of working fluid

C

Mass of the working fluid

D

Mass and pressure both of the working fluid

The efficiency of Carnot cycle depends upon

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