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The minimum drag speed in terms of equivalent airspeed is unaffected by the altitude.

(a) True

(b) False

I had been asked this question during an interview for a job.

The question is from Effect of WAT on Cruise Performance topic in division Cruising Performance of Aircraft Performance

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The correct option is (a) True

The explanation: The minimum drag speed in terms of equivalent airspeed is unaffected by the altitude. Also there will be an increase in the true airspeed, mach number and minimum drag speed with decrease in altitude.

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