(i) (i) Since the axial velocity is defined as C a C 2 cos 2 600 cos 65 253.57 m/s U C a (tan 2 - tan 2 ) U 253.57 (tan 65 -tan 25) 425.5 m/s The rotational speed is defined as U ND /60 or N 60 U / D Thus, N 60*425.5/ *0.6 13,545 rpm W 3 a 3 C u2 C u3 b C 2 C 3 W 2 U (ii) Stage temperature drop is given by T 0 stage U C a C p tan 2 tan 3 With C p R = 1 1168 : 8J = kgK T 0 stage 425 : 5 * 253 : 37 1168 : 8 tan 25 tan 60 T 0 stage 202 : 77K From Eq. ( 10.5c ); stage pressure ratio is then s P 01 0 : 25 202 : 77 2 : 35 P 03 1 0 : 88