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GATE Aeronautical Engineering
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Let's practice 30 mcqs on
GATE Aeronautical Engineering
mcqs by everyone
Select the pair that best expresses a relationship similar to that expressed in the pair: water: pipe
cart: road
sea: beach
music: instrument
electricity: wire
The idealized cross-section of a beam is comprised of four identical booms connected by shearwebs.
The beam is subjected to a bending moment ???? as shown in thefigure.
The inclination of the neutral axis to the x-axis in degrees is
45 CW
63.4 CCW
45 CCW
26.6 CW
A damped single degree-of-freedom system is vibrating under a harmonic excitation with an amplitude ratio of 2.5 atresonance.
The damping ratio of the system is ______________
0.7
0.1
0.2
0.6
The Poisson’s ratio,ν of most aircraft grade metallic alloys has values in the range
0.4 ≤ν ≤0.5
−1 ≤ν ≤0
0 ≤ ν ≤0.2
0.2 ≤ν ≤0.4
An aircraft has a steady rate of climb of 300 m/s at sea level and 150 m/s at 2500 maltitude.
The time taken (in sec) for this aircraft to climb from 500 m altitude to 3000 m altitude is ____
13 to 14
14 to 15
16 to 17
15 to 16
In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponentsrespectively.
Out of the total production, 2% of M1 and 3% of M2 are found to bedefective.
If a randomly drawn autocomponent from the combined lot is found defective, what is the probability that it was manufactured by M2
0.35
0.4
0.5
0.45
Consider one-dimensional isentropic flow at a Mach number of 0.5. If the area of cross-section of a streamtube increases by 3% somewhere along the flow, the corresponding percentage change in density is ________
1
3
2
4
For a wing of aspect ratio AR, having an elliptical lift distribution, the induced drag coefficient is (where CL is the lift coefficient)
C2L/∏AR2
C2L/∏AR
CL/∏AR
CL/2∏AR
The channel section of uniform thickness 2mm shown in the figure is subjected to a torque of 10 Nm. If it is made of a material with shear modulus of 25 GPa, the twist per unit length in radians/m is _________
0.13 to 0.14
0.12 to 0.13
0.14 to 0.15
0.15 to 0.16
Values of a, b and c, which render the matrix orthonormal are, respectively
1/√2, 1/√2, 0
1/√6, -2/√6, 1/√6
-1/√3, -1/√3, 1/√3
-1/√6, 2/√6, -1/√6
If a prime number on division by 4 gives a remainder of 1, then that number can be expressed as
sum of cubes of two natural numbers
sum of squares of two natural numbers
sum of square roots of two natural numbers
sum of cube roots of two natural numbers
Consider a thin flat plate airfoil at a small angle x to an oncoming supersonic stream ofair.
Assuming the flow to be inviscid, Cd / C2l is
proportional to x2
Zero
independent of x
proportional to x
The logarithmic decrement measured for a viscously damped single degree of freedom system is 0.125.
The value of the damping factor in % is closest to
2.0
0.5
1.5
1.0
A wing-body alone configuration airplane with a wing loading of W/S = 1000 N/m2 is flying in cruise condition at a speed V = 90m/s at sea-level
(air density at sea-level P∞ = 1.22 kg/m3). The zero lift pitching moment coefficient of the airplane is Cwbmac = Cm0 = -0.06 and the location of airplane aerodynamic center from the wing leading edge is Xac = 0.25c.
Here c is the chordlength.
The airplane trim lift coefficient CL trim is
0.202
0.502
0.402
0.302
Data for an airplane are given as follows: weight W = 30kN, thrust available at sea-level T0 = 4000 N, wing planform area S = 30 m2, maximum lift coefficient CL max = 1.4, and drag coefficient CD = 0.015 + 0.024C2L.
Assume air density at sea-level P∞ = 1.22 kg/ m3. Stall speed of the airplane in m/s is
17.36
119.46
34.22
45.52
The directional derivative of the function f(x,y) = (x2 + xy2)/√5 in the direction at (x, y) =
(1,1) is
-1/√5
-1/5
-2/√5
Following table gives data on tourists from different countries visiting India in the year2011.
Which two countries contributed to the one third of the total number of tourists who visited India in 2011
USA and Japan
England and France
Japan and Australia
USA and Australia
If an aircraft takes off with 10% less fuel in comparison to its standard configuration, its range is
lower by exactly 10%.
lower by more than 10%.
an unpredictable quantity.
lower by less than 10%.
An aircraft in trimmed condition has zero pitching moment at
its aerodynamic centre.
50% of its wing root chord.
25% of its mean aerodynamic chord.
its centre of gravity.
The Mach angle for a flow at Mach 2.0 is
60o
90o
45o
30o
If |-2X + 9| = 3 3 then the possible value of |-X| - X2 would be
30
-42
42
-30
Buckling of the fuselage skin can be delayed by
placing stiffeners farther apart.
placing stiffeners farther and decreasing internal pressure.
reducing skin thickness.
increasing internal pressure.
Data for an airplane are given as follows: weight W = 30kN, thrust available at sea-level T0 = 4000 N, wing planform area S = 30 m2, maximum lift coefficient CL max = 1.4, and drag coefficient CD = 0.015 + 0.024C2L.
Assume air density at sea-level P∞ = 1.22 kg/ m3. Minimum and maximum speeds of the airplane in level flight condition at sea-level in m/s are respectively
17.36 and 119.46
34.22 and 119.46
17.36 and 34.22
17.36 and 180
Streamline pattern of flow past a cylinder is shown in the figurebelow.
The oncoming flow is steady, irrotational andincompressible.
The flow is from left toright.
Bernoulli’s equation CANNOT be applied between the points
1 and 5
5 and 6
3 and 4
1 and 2
The general solution of the different equation d2y/dt2 + dy/dt - 2t = 0 is
Ae-2t + Be-t
Ae-t + Be2t
Aet + Be2t
Ae-2t + Bet
The critical Mach number of an airfoil is attained when
the freestream Mach number is sonic.
the Mach number everywhere on the airfoil is supersonic.
the Mach number somewhere on the airfoil is unity.
the freestream Mach number is supersonic.
If 3 ≤ X ≤ 5 and 8 ≤ Y ≤ 11 then which of the following options is TRUE
3/11 ≤ X/Y ≤ 8/5
3/5 ≤ X/Y ≤ 8/11
3/5 ≤ X/Y ≤ 8/5
3/11 ≤ X/Y ≤ 5/8
Which one of the following is the most stable configuration of an airplane in roll
Sweep back, anhedral and low wing
Sweep forward, anhedral and high wing
Sweep forward, dihedral and low wing
Sweep back, dihedral and high wing
At x = 0 , the function y = |x| is
not continuous but differentiable
continuous but not differentiable
not continuous and not differentiable
continuous and differentiable
Choose the most appropriate alternative from the options given below to complete the following sentence: I ___ to have bought a diamond ring
have a liking
would like
should have liked
may like
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