Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
Any one of the above
The amount of heat required to raise the temperature of 1 kg of water through one degree
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

All of these
All the processes, taking place in the cycle of operation, must be extremely slow
The working parts of the engine must be friction free
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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