GATE AE discipline:aerospace-engineering PYQs & Answers — Page 60

Questions 591–600 of 650. Imported answers require independent review unless marked reviewed.

Which one of the following statements is NOT true

Your answerChoose one option.

The pitching moment of any airfoil at any angle of attack is always zero at the center of pressure

The pitching moment of any airfoil at any angle of attack is always zero at the aerodynamic center

The center of pressure and aerodynamic center coincide for a symmetric airfoil

The pitching moment about the aerodynamic center, for any airfoil, does not vary with angle of attack

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Which one of the following statements is NOT true

Your answerChoose one option.

Compared to a laminar boundary layer, a turbulent boundary layer is more desirable on a wing operating at large angle of attack

The skin friction drag for a turbulent boundary layer is larger than that for a laminar boundary layer

The location of transition from laminar to turbulent boundary layer depends only on the operating Reynolds number

A separated flow does not necessarily lead to a turbulent boundary layer

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A De Laval nozzle is to be designed for an exit Mach number of 1.5. The reservoir conditions are given as

atm (gage),

. Assuming shock free flow in the nozzle, the exit absolute pressure (in atm) is __________ (in three decimal places)

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Consider a steady one dimensional flow of a perfect gas with heat transfer in a duct. The T-s diagram (shown below) shows both the static and the stagnation conditions at two locations, A and B, in the duct.

and

denote stagnation conditions for states A and B, respectively. It is known that

Diagram for Aerospace Engineering question 9

and

are the Mach numbers of the flow at locations A and B. Which of the following statements is true about the flow.

Your answerChoose one option.

Flow is subsonic and

Flow is supersonic and

Flow is subsonic and

Flow is supersonic and

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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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Which of the following statement(s) is / are true about the shear centre of a cross-section: P: It is that point in the cross-section through which shear loads produce no twisting. Q: This point is also the centre of twist of sections subjected to pure torsion. R: The normal stress at this point is always zero.

Your answerChoose one option.

P, Q and R

P only

P and Q only

P and R only

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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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The period of revolution of earth about the sun is 365.256 days, approximately. The semi-major axis of the earth’s orbit is close to

m. The semi-major axis of the orbit of Mars is

m. The period of revolution of Mars, about the sun, is __________ Earth days (in three decimal place)

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Consider a system consisting of certain amount of perfect gas enclosed in a cylinder fitted with a frictionless piston. This system can undergo following processes (i) Expansion with finite pressure difference with the surrounding. (ii) Compression with infinitesimal pressure difference with the surrounding. (iii) Heat transfer with finite temperature difference with the reservoir. (iv) Heat transfer with infinitesimal temperature difference with the reservoir. Out of these which processes are reversible?

Your answerChoose one option.

(i) and (iii)

(i) and (iv)

(ii) and (iii)

(ii) and (iv)

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GATE AE discipline:aerospace-engineering PYQs

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Question 15