In De Laval Nozzle critical pressure ratio is given by (2/y+1)^(y/y-1). April 6, 2021 by admin Question: In De Laval Nozzle critical pressure ratio is given by (2/y+1)^(y/y-1). A. true B. false Answer» a. true Note: The above multiple-choice question is for all general and Competitive Exams in India.