Aeroderivative engines have pressure ratios / » Thermal Engineering 2 solved MCQs / By admin Question: Aeroderivative engines have pressure ratios A. greater than 30 B. lesser than 30 and greater than 20 C. greater than 50 D. none of the mentioned Answer» a. greater than 30 Note: The above multiple-choice question is for all general and Competitive Exams in India.