Reversible Carnot cycle - Thermodynamics

Q.  Carnot cycle is
- Published on 20 Aug 15

a. a reversible cycle
b. an irreversible cycle
c. practical cycle
d. none of the above

ANSWER: a reversible cycle
 
Carnot cycle consists of two reversible isothermal processes and two reversible adiabatic processes. Consider a stationary system as in piston cylinder machine as shown in below diagram,

Carnot Cycle

The above Carnot cycle consists of

A reversible isothermal process in which heat Qa enters the system from source A reversibly when cylinder cover is in contact with diathermic cover D.

A reversible adiabatic process, in which a diathermic cover D is replaced by the adiabatic cover C and work Wa is done by the system reversibly at the expense of internal energy of the system.

A reversible isothermal process, in which again an adiabatic cover C is replaced by a diathermic cover D and heat Qb is rejected to the sink B from the system reversibly.

A reversible adiabatic process, in which a diathermic cover D is replaced again by the adiabatic cover C and work Wb is done upon the system reversibly and the internal energy of the system increases.

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