To refrain from separation in subsonic nozzles, the expansion angle must not be more than April 7, 2021 by admin Question: 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 Note: The above multiple-choice question is for all general and Competitive Exams in India.