Answer :
Answer:
1/2 or 1:2
Explanation:
first convert speed of compressor to rpms
Compressor speed= w1 = 150 cycles/s= 150 * 60= 9000 rpms
Speed of turbine= w2 = 18000 rpms
gear ratio = N2/N1 = w1/w2
gear ratio = 9000/18000
gear ratio = 1/2
gear ratio = 1:2