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What are the factors for that increase the drag in an aircraft?

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in Aircraft Performance by (558k points)
What are the factors for that increase the drag in an aircraft?

(a) Varying airspeed

(b) Constant airspeed

(c) Varying thrust

(d) Varying fuel ratio

This question was posed to me in an interview.

I would like to ask this question from Descent Performance in Aircraft Operations topic in portion Climb and Descent Performance of Aircraft Performance

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Correct option is (a) Varying airspeed

Easiest explanation: The drag that is produced in the aircraft is increased by aerodynamic means or by varying the airspeed. The aircraft has a very wide range of descent path for the aircrafts. The aircraft will descend if the propulsive thrust is less than the airframe drag.

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