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Which drag is prominent after exceeding the critical Mach number?

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Which drag is prominent after exceeding the critical Mach number?

(a) Form drag

(b) Wave drag

(c) Pressure drag

(d) Skin – friction drag

The question was posed to me in a national level competition.

Question is taken from Critical Mach Number in portion Linearized and Conical Flows of Aerodynamics

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Best answer
Correct choice is (c) Pressure drag

The explanation: When the flow exceeds critical Mach number, there is a formation of supersonic region which is followed by a shock wave. There is a pressure loss across the shock wave which results in large pressure drag.

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