GATE AE kind:question PYQs & Answers — Page 18

Questions 171–180 of 650. Imported answers require independent review unless marked reviewed.

An aircraft with a turbojet engine is flying at 250 m/s. The uninstalled thrust produced by the engine is 6000 N. The heating value of the fuel is

J/kg. The engine has a thermal efficiency of 35% while burning the fuel at a rate of 3 kg/s. Assume the engine exit pressure to be equal to the ambient pressure. What is the propulsion efficiency of the engine under these conditions (in percentage)?

Your answerChoose one option.

32.5

35.0

11.4

92.4

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Consider a flat plate, with a sharp leading edge, placed in a uniform flow of speed U. The direction of the free-stream flow is aligned with the plate. Assume that the flow is steady, incompressible and laminar. The thickness of the boundary layer at a fixed stream-wise location L from the leading edge of the plate is

. Which one of the following correct describes the variation of

with U?

Your answerChoose one option.

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Shock structures for flow at three different Mach numbers over a given wedge are shown in the figure below. Assuming that only the weak shock solutions are possible for the attached oblique shocks, which one of the following options is TRUE?

Diagram for Aerospace Engineering question 43

Your answerChoose one option.

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Air flowing at Mach number M = 2 from left to right accelerates to M = 3 across an expansion corner as shown in the figure. What is the value of

(the angle between the Forward and Rearward Mach lines) in degrees?

The values of the Prandtl-Meyer functions are

and

Diagram for Aerospace Engineering question 44

Your answerChoose one option.

23.38

19.47

53.38

33.91

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Consider the function

where x is real. Which of the following statements is/are correct?

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

The function is continuous for all x

The derivative of the function is discontinuous at x = 0

The derivative of the function is continuous at x = 1

The function is discontinuous at x = 0

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The figure shows plots of two yield loci for an isotropic material, where

and

are the principal stresses, and

is the yield stress in uniaxial tension. Which of the following statements is/are correct?

Diagram for Aerospace Engineering question 46

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

Criterion P presents the von Mises criterion

Criterion Q presents the Tresca criterion

Criterion P presents the Tresca criterion

Criterion Q presents the von Mises criterion

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Which of the following statements about absolute ceiling and service ceiling for a piston-propeller aircraft is/are correct?

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

The altitude corresponding to absolute ceiling is higher than that for service ceiling

At the absolute ceiling, the power required for cruise equals the maximum power available

The altitude corresponding to absolute ceiling is lower than that for service ceiling

At the service ceiling, the maximum rate of climb is 50 ft/min

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For an airplane having directional / weathercock static stability, which of the following options is/are correct?

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

The airplane when disturbed in yaw, from an equilibrium state, will experience a restoring moment

The variation of yawing moment coefficient (

) with sideslip angle (

) for the airplane will look like

Diagram for Aerospace Engineering question 48

The airplane will always tend to point into the relative wind

The airplane when disturbed in yaw will return to equilibrium state in a finite amount of time after removing the disturbance

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Which of the following statements is/are TRUE for an axial turbine?

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

For a fixed rotational speed, the mass flow rate increases with increase in the flow coefficient

The absolute stagnation enthalpy of the flow decreases across the nozzle row

The relative stagnation enthalpy remains unchanged through the rotor

For a fixed rotational speed, the mass flow rate remains unchanged with a change in the flow coefficient

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Which of the following statements is/are TRUE for a single stage axial compressor?

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

Starting from design condition and keeping the mass flow rate constant, if the blade RPM is increased, the compressor rotor may experience positive incidence flow separation (actual relative flow angle greater than the design blade angle)

Starting from design condition at the same blade RPM, if the mass flow rate is increased, the compressor rotor may experience positive incidence flow separation (actual relative flow angle greater than the design blade angle)

Keeping the mass flow rate constant, if the blade RPM is increased, the compressor may experience surge

At the same blade RPM, if the mass flow rate is increased, the compressor may experience surge

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GATE AE kind:question PYQs

Question 41

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Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50