GATE AE concept:induced-drag PYQs & Answers

Questions 1–6 of 6. Imported answers require independent review unless marked reviewed.

The fundamental purpose of the Kutta condition in the thin airfoil theory is ________.

Your answerChoose one option.

to determine the total strength of the source distribution

to determine the speed of the uniform flow

to incorporate the essential effect of viscosity in the potential flow theory

to incorporate the concept of induced drag in the inviscid theory

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An elliptic wing has a span of 6 m and a planform area of 6 m

. When generating a lift coefficient of 0.6, the induced drag it incurs is ________

(rounded off to 1 decimal place).

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What is/are the use(s) of the single horseshoe vortex model of finite wing aerodynamic theory?

Your answerSelect all correct options. You can choose more than one.

It can approximate the wing pitching moment coefficient

It can approximate the wing induced drag coefficient

It can approximate the effect of the wing on the induced drag coefficient of a typical horizontal tail

It can approximate the aerodynamic benefit/penalty of formation flight compared to isolated flight

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A lifting surface has a spanwise circulation distribution of

(where

) over its span

, and

is the spanwise coordinate. Furthermore, the downwash varies along the span as

, where

is the free stream velocity. Which one of the following options represents total lift (

) and induced drag (

Your answerChoose one option.

and

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An airplane of mass 1000 kg is in a steady level flight with a speed of 50 m/s. The wing has an elliptic planform with a span of 20 m and planform area 31.4 m

. Assuming the density of air at the altitude to be 1 kg/m

and acceleration due to gravity to be 10 m/s

, the induced drag on the wing is ________ N (rounded off to 1 decimal place).

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A finite wing of elliptic planform with aspect ratio 10, whose section is a symmetric airfoil, is placed in a uniform flow at 5 degrees angle of attack. The induced drag coefficient for the wing is ______ (round off to three decimal places).

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GATE AE concept:induced-drag PYQs

How to practice concept:induced-drag

Question 20

Question 35

Question 48

Question 36

Question 64

Question 41