Consider the following statements in relation to a convergent-divergent steam nozzle operating under chocked conditions:
1. In the convergent portion steam velocity is less than sonic velocity
2. In the convergent portion steam velocity is greater than sonic velocity
3. In the divergent portion the steam velocity is less than sonic velocity
4. In the divergent portion the steam velocity is greater than sonic velocity
Which of the above statements are correct?
a. 1 and 3 b. 1 and 4
c. 2 and 3 d. 2 and 4