Which of the following statements are correct for a throttling process?
1. It is an adiabatic steady flow process
2. The enthalpy before and after throttling is same
3. In the process, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity
(a) 1 and 2 only (b) 1 and 3only
(c) 2 and 3 only (d) 1, 2 and 3