Question

1-For a turbine, the isentropic work output is always greater than the actual work output

A True

B False

2-For a compressor, the isentropic work input is always greater than the actual work output

A True

B False

3-Ignoring kinetic and potential energy, and for a steady state process with one inlet and one outlet, the internally reversible work can be given as:

A ∫12​pdv

B ∫12​vdp

Answer 1

1.

True, work consumed by actual turbine is lower than work consumed by isentropic turbine. As isentropic state is an ideal state assumed.

2. False, Isentropic efficiency is ratio of isentropic work input to actual work input, or ratio of actual work output to isentropic work input. here we can see that isentropic work input of compressor will be identical to actual work output.

3. Internally reversible work of steady state process is given by:

Ignoring K.E. and P.E.,