1. Its maximum efficiency is less than that of the fluid coupling |
2. It has two runners and a set of stationary vanes interposed between them. |
3. It has two runners. |
4. The ratio of secondary to primary torque is zero for the zero value of angular velocity of secondary. |
A) 1 and 2
B) 3 and 4
C) 1 and 4
D) 2 and 4
Correct Answer: D
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