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