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Aerospace Engineering Gate 2020 Questions with Answer
Ques 14 GATE 2020
The streamlines of a steady two dimensional flow through a channel of height 0.2 m are plotted in the figure, where is the stream function in m²/s. The volumetric flow rate per unit depth is
Ques 15 GATE 2020
Which of the following options can result in an increase in the Mach number of a supersonic flow in a duct?
Ques 16 GATE 2020
A Pilot tube mounted on the wing tip of an airplane flying at an altitude of 3 km measures a pressure of 0.72 bar, and the outside air temperature is 268.66 K. Take the sea level conditions as, pressure =1.01 bar, temperature =288.16 K and density =1.225 kg/m³. The acceleration due to gravity is 9.8 m/s² and the gas constant is 287 J/(kg K). Assuming standard atmosphere, the equivalent airspeed for this airplane is _______ m/s (round off to two decimal place).
Ques 17 GATE 2020
The ratio of exit stagnation pressure to inlet stagnation pressure across the rotating impeller of a centrifugal compressor, operating with a closed exit, is
Ques 18 GATE 2020
Which one of the following is a hypergolic propellant combination used in rocket engines?
Ques 19 GATE 2020
In aircraft engine thermodynamic cycle analysis, perfectly expanded flow in the nozzle means that the static pressure in the flow at the nozzle exit is equal to
Ques 20 GATE 2020
A rocket engine has a sea level specific impulse of 210 s and a nozzle throat area of 0.005 m². While testing at sea level conditions, the characteristic velocity and pressure for the thrust chamber are 1900 m/s and 50 bar, respectively. Assume the acceleration due to gravity to be 9.8 m/s². The thrust produced by the rocket engine is _______ kN (round off to one decimal place).
Ques 21 GATE 2020
The design flight Mach number of an ideal ramjet engine is 2.8. The stagnation temperature of air at the exit of the combustor is 2400 K. Assuming the specific heat ratio of 1.4 and gas constant of 287 J/(kg K) the velocity of air at the exit of the engine is _______ m/s (round off to one decimal place).
Ques 22 GATE 2020
The operating conditions of an aircraft engine combustor are as follows.
The rate of total enthalpy of air entering the combustor =28.94 MJ/s.
The rate of total enthalpy of air leaving the combustor=115.42 MJ/s.
Mass flow rate of air =32 kg/s.
Air to fuel mass ratio =15.6
Lower heating value of the fuel =46 MJ/kg.
The efficiency of the combustor is _______ % (round off to two decimal places).
Ques 23 GATE 2020
The figure shows the T-S diagram for an axial turbine stage.
(Image of a T-S diagram is given)
Ques 24 GATE 2020
Which one of the following conditions needs to be satisfied for φ=A +By⁴+C xy³ to be considered as an Airy's stress function?
Ques 25 GATE 2020
Which one of the following conditions needs to be satisfied for φ=A x4 +By⁴+C xy³ to be considered as an Airy's stress function?
Ques 26 GATE 2020
Consider the plane strain field given by εxx=Ay²+x, εyy=Ax²+y, γxy=B xy+y. The relation between A and B needed for this strain field to satisfy the compatibility condition is
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