question_answer

Consider the following statements in respect of nozzles:

1. The nozzle efficiency is defined as the ratio of the actual enthalpy drop to the isentropic enthalpy drop between the same pressures.

2. Velocity coefficient is defined as the ratio of exit velocity when the flow is isentropic, to the actual velocity.

3. The included angle of divergence is usually kept more than \[20{}^\circ .\]

Which of the statements given above is/are correct?

A) 1 only              

B) 1 and 2 only       

C) 3 only              

D) 1, 2 and 3