GATE AE topic:static-stability PYQs & Answers — Page 3

Questions 21–25 of 25. Imported answers require independent review unless marked reviewed.

An aircraft wind tunnel model, having a pitch axis mass moment of inertia (

) of 0.014 kg-m

, is mounted in such a manner that it has pure pitch motion about its centre of gravity, where it is supported through a frictionless hinge. If the pitching moment (M) derivative with respect to angle of attack (

), denoted by

, is −0.504 N-m/rad and the pitching moment (M) derivative with respect to pitch rate (q), denoted by

, is −0.036 N-m/(rad/s), the damping ratio of the resulting motion due to an initial disturbance in pitch angle is approximately ________ (accurate to three decimal places).

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To ensure only the longitudinal static stability (and not the condition for equilibrium) of a low speed aircraft, the aircraft components must be designed to satisfy which one of the following conditions:

Your answerChoose one option.

and

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Let

and

be respectively the non-dimensional locations of the stick-fixed maneuver point and stick-fixed neutral point of a low speed conventional aircraft. These distances are measured with respect to the nose of the fuselage. The numerical value of

Your answerChoose one option.

will always be negative

will always be positive

will always be zero

can have any value depending on the location of the center of gravity of the aircraft

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The phenomenon of rudder lock in conventional low speed aircraft is primarily due to

Your answerChoose one option.

large value of directional derivative,

the sidewash due to fuselage on the vertical stabilizer

the tendency of rudder to float rapidly at high angles of side-slip

the sidewash due to wing on the vertical stabilizer

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An aircraft model was tested in a low speed wind-tunnel (Reynolds number =

based on wing mean chord). The variation of pitching moment coefficient (

) with angle of attack (

) for two elevator deflections (

) as recorded during this test is presented below.

Diagram for Aerospace Engineering question 38

Based on the result presented in the figure above, the value of elevator control power (

) in per radian will be ___________ (in three decimal place).

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GATE AE topic:static-stability PYQs

Question 55

Question 10

Question 12

Question 13

Question 38