GATE AE topic:aerospace-engineering PYQs & Answers — Page 63

Questions 621–630 of 650. Imported answers require independent review unless marked reviewed.

In the figure below, water exits from a nozzle into atmospheric pressure of 101 kPa. If the exit velocity is

m/s and friction is neglected, the magnitude of the axial force on the flange at location 1 required to keep the nozzle attached to the pipe is ____________ N (round to nearest integer).

Diagram for Aerospace Engineering question 36

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A football, meant to be thrown at 100 km/h in sea level air (

kg/m

N-s/m

), is to be tested using a one-quarter scale model in a water tunnel (

kg/m

N-s/m

). For dynamic similarity the ratio of the model force to the prototype force is ____________ (round to nearest integer).

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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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A pilot was flying a single engine propeller aircraft and maintaining a steady level flight at a lift coefficient,

at an altitude of 500 m. Due to some emergency, at the same altitude (500 m), the pilot had to fully deploy the landing gear. If the pilot wants to maintain steady level flight at the same

and at the same altitude, which of the following control actions should the pilot undertake:

Your answerChoose one option.

move the elevator up, and decrease the throttle

move the elevator up, and increase the throttle

move the elevator down, and decrease the throttle

move the elevator down, and increase the throttle

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A conventional low speed aircraft had the following aerodynamic characteristics:

(Oswald efficiency). The aircraft was flown to maintain a steady level flight and for minimum thrust required, at a lift coefficient of

. The numerical value of the aspect ratio of the wing is ____________ (in three decimal places).

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A batch of aluminium alloy yields in uniaxial tension at the stress of 330 MN/m

. If this material is subjected to the following state of stress:

MN/m

and

. The value of x that would result in yielding according to the Von Mises failure criterion is __________ (in three decimal places).

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The roots obtained by solving longitudinal characteristic equations of motion for a statically stable aircraft are given below:

, where

The undamped short-period longitudinal natural frequency (radians/sec) and damping ratio, in that order, are close to

Your answerChoose one option.

3.40, 0.73

3.36, 0.65

3.83, 0.56

3.20, 0.63

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An aircraft is to be designed to ensure that it has enough excess power to achieve steady climb at flight path angle,

degrees, maintaining

. The numerical value of the thrust to weight ratio of the complete aircraft to meet the above requirement under standard atmospheric condition will be ________ (in three decimal place).

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A conventional aircraft was analyzed to estimate the contribution of wing towards

(

) of the whole aircraft. The wing was installed with zero setting angle along the fuselage reference line. Further, the wing was laid such that

, and

and

are the non-dimensional distances, from the leading edge of the wing, of the aerodynamic center of the wing and center of gravity of the aircraft respectively. The wing had the following aerodynamic characteristics:

, and

. The numerical value of

(contribution of the wing to

) about the CG of the aircraft is ________ (in two decimal places).

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In a combustor, gaseous Octane (C₈H₁₈) and air are to be burned in stoichiometric proportions. If the required flow rate of air is 1 kg/s, what should be the corresponding flow rate of Octane?

Your answerChoose one option.

0.066 kg/s

15.15 kg/s

0.16 kg/s

6.25 kg/s

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GATE AE topic:aerospace-engineering PYQs

Question 36

Question 37

Question 38

Question 39

Question 40

Question 41

Question 42

Question 43

Question 44

Question 45