Engineering Thermodynamics
A diathermic wall is one which

Encourages thermal interaction
Discourages thermal interaction
Prevents thermal interaction
Permits thermal interaction

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

All of these
The working parts of the engine must be friction free
All the processes, taking place in the cycle of operation, must be extremely slow
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process

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