GAT Subject
Engineering
Computer Science Civil Engineering Chemical Engineering Agricultural Engineering Mechanical Engineering Electronics and Communication
20. | The condition for the reversibility of a cycle is | |
A. | the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process | |
B. | all the processes, taking place in the cycle of operation, must be extremely slow | |
C. | the working parts of the engine must be friction free | |
D. | all of the above | |