A.      Explain transpiration cooling. What is film cooling?

B.      What do you understand by ablative cooling? What are its applications?

C.      What is ablative velocity? What is heat of ablation?

D.      A thermocouple 0.063 cm in diameter is held normal to an air stream, and at M = 0.7, it reads 60°C. If the recovery factor is 0.9, find the static temperature of the air. 9.4 Air at 1/20 atm and 275 K flows with a free stream velocity of 700 m/s over a flat plate 1.2 m long. If the surface of the plate is to be maintained at 325 K, determine the amount of cooling needed per metre width of the plate.