GATE AE exam:gate PYQs & Answers — Page 22

Questions 211–220 of 650. Imported answers require independent review unless marked reviewed.

In a two-dimensional potential flow, the doublet is a limit of the superposition of

Your answerChoose one option.

a uniform stream and a source

a source and a sink of equal strength

a uniform stream and a sink

a source and a vortex

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An ideal glider has drag characteristics given by

, where

is the induced drag coefficient,

is the lift coefficient, and

is a constant. For maximum range of the glider, the ratio

Your answerChoose one option.

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The figures shown in the options are schematics of airfoil shapes (not to scale). For a civilian transport aircraft designed for a cruise Mach number of 0.8, which among them is aerodynamically best suited as a wing section?

Your answerChoose one option.

Diagram for Aerospace Engineering question 18

Diagram for Aerospace Engineering question 18 (figure 2)

Diagram for Aerospace Engineering question 18 (figure 3)

Diagram for Aerospace Engineering question 18 (figure 4)

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For a longitudinally statically stable aircraft, which one of the following represents the relationship between the coefficient of pitching moment about the center of gravity

and absolute angle of attack

? (Note: nose-up moment is positive.)

Your answerChoose one option.

Diagram for Aerospace Engineering question 19

Diagram for Aerospace Engineering question 19 (figure 2)

Diagram for Aerospace Engineering question 19 (figure 3)

Diagram for Aerospace Engineering question 19 (figure 4)

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In a single-spool aviation turbojet engine, which of the following is the correct relationship between the total work output

of a 2-stage axial turbine and the total work required

by a 6-stage axial compressor, neglecting losses?

Your answerChoose one option.

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For a stage of a 50% reaction ideal axial flow compressor (symmetrical blading), select the correct statement from the options given.

Your answerChoose one option.

The stagnation enthalpy rise across the rotor is 50% of the rise across the stage.

The static enthalpy rise across the rotor is 50% of the rise across the stage.

Axial velocity component of the flow at the rotor exit is 50% of that at the rotor entry.

The static pressure rise across the rotor is 50% of the rise across the stator.

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An aircraft is cruising with a forward speed

and the jet exhaust speed relative to the engine at the exit is

. If

, what is the propulsive efficiency?

Your answerChoose one option.

0.50

1.00

0.33

0.67

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Consider the four basic symmetrical flight loading conditions corresponding to the corners of a typical V-n diagram. For one of these flight loading conditions, it is observed that (i) the compressive bending stresses have a maximum value in the bottom aft region (see figure) of the wing cross-section; and (ii) the tensile bending stresses are maximum in the upper forward region (see figure) of the wing cross-section. For the preceding observations, select the corresponding flight loading condition from the options given.

Diagram for Aerospace Engineering question 23

Your answerChoose one option.

Positive high angle of attack

Positive low angle of attack

Negative high angle of attack

Negative low angle of attack

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Which one of the following figures represents the qualitative variation of absolute deceleration

with altitude

(measured from the mean sea level) for a space vehicle undergoing a ballistic entry into the Earth’s atmosphere?

Your answerChoose one option.

Diagram for Aerospace Engineering question 24

Diagram for Aerospace Engineering question 24 (figure 2)

Diagram for Aerospace Engineering question 24 (figure 3)

Diagram for Aerospace Engineering question 24 (figure 4)

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Which of the following statement(s) is/are true about harmonically excited forced vibration of a single degree-of-freedom linear spring-mass-damper system?

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

The total response of the mass is a combination of free vibration transient and steady-state response.

The free vibration transient dies out with time for each of the three possible conditions of damping (under-damped, critically damped, and over-damped).

The steady-state periodic response is dependent on the initial conditions at the time of application of external forcing.

The rate of decay of free vibration transient response depends on the mass, spring stiffness and damping constant.

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GATE AE exam:gate PYQs

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23

Question 24

Question 25