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Aerospace Engineering Gate 2018 Questions with Answer
Ques 14 GATE 2018
The solution of the differential equation d2y/dx2+3dy/dx=0. given that y=0 and dy/dx=1 at x=0 is
Ques 15 GATE 2018
The relation between pressure (p) and velocity (V) for a steady, isentropic flow at two points along a streamline is, (c is a constant)
Ques 16 GATE 2018
Consider the vector field v=−(y/r2)î+(x/r2)j; where r=√(x2+y2) The contour integral ∮v⋅ds, where ds is tangent to the contour that encloses the origin, is ________ (accurate to two decimal places).
Ques 17 GATE 2018
The magnitude of the x-component of a unit vector at the point (1, 1) that is normal to equi-potential lines of the potential function φ(r)=1/(r2+4), where r=√(x2+y2) is ________ (accurate to two decimal places).
Ques 18 GATE 2018
A jet aircraft is initially flying steady and level at its maximum endurance condition. For the aircraft to fly steady and level, but faster at the same altitude, the pilot should
Ques 19 GATE 2018
The pilot of a conventional airplane that is flying steady and level at some altitude, deflects the port side aileron up and the starboard aileron down. The aircraft will then
Ques 20 GATE 2018
An airplane requires a longer ground roll to lift-off on hot summer days because
Ques 21 GATE 2018
The highest limit load factor experienced by a civil transport aircraft is in the range
Ques 22 GATE 2018
A statically-stable aircraft has a CLα=5 (where the angle of attack, α, is measured in radians). The coefficient of moment of the aircraft about the center of gravity is given as CM,c.g=0.05−4α The mean aerodynamic chord of the aircraft wing is 1 m. The location (positive towards the nose) of the neutral point of the aircraft from the center of gravity is ________ (in m, accurate to two decimal places).
Ques 23 GATE 2018
An aircraft with a gross weight of 2000 kg, has a speed of 130 m/s at sea level, where the conditions are: 1 atmosphere (pressure), 288 K (temperature), and 1.23 kg/m3 (density). The speed (in m/s) required by the aircraft at an altitude of 9000 m, where the conditions are: 0.31 atmosphere, 230 K, and 0.47 kg/m3 to maintain a steady, level flight is ________ (accurate to two decimal places).
Ques 24 GATE 2018
A pitot probe on an aircraft in a steady, level flight records a pressure of 55,000 N/m2 The static pressure and density are 45,280 N/m2 and 0.6 kg/m3, respectively. The wing area and the lift coefficient are 16 m2 and 2, respectively. The wing loading (in N/m2 on this aircraft is ________ (accurate to one decimal place).
Ques 25 GATE 2018
Gross weight of an airplane is 7000 N, wing area is 16 m2, and the maximum lift coefficient is 2.0. Assuming density at the altitude as 1.23 kg/m3, the stall speed (in m/s) of the aircraft is ________ (accurate to two decimal places).
Ques 26 GATE 2018
An aircraft with a turbojet engine flies at a velocity of 100 m/s. If the jet exhaust velocity is 300 m/s, the propulsive efficiency of the engine, assuming a negligible fuel-air ratio, is
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