Q.

To refrain from separation in subsonic nozzles, the expansion angle must not be more than            

A. 10 degrees
B. 20 degrees
C. 30 degrees
D. 40 degrees
Answer» A. 10 degrees
Explanation: if the angle is more than 10 degrees, there will be a drift amidst the nozzle. at any angle more than 10 degrees, this separation will occur. but the minimum value is 10 degrees. so, the answer is 10 degrees.
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