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Aerospace Engineering Gate 2017 Questions with Answer
Ques 14 GATE 2017
The maximum gas flow rate that can be handled by a multistage axial compressor at a given rotational speed is dictated by
Ques 15 GATE 2017
For a turbine stage, which one of the following losses occurs due to the turning of the wall boundary layer through an angle due to curved surface?
Ques 16 GATE 2017
In the vane-less space between the impeller and the diffuser vanes in a Centrifugal Compressor, the angular momentum varies in the following manner in the radial direction
Ques 17 GATE 2017
Which of the following statements about the neutral axis of a beam with unsymmetrical cross section is true:
Ques 18 GATE 2017
In a combustor, gaseous Octane (C8H18) and air are to be burned in stoichiometric proportions. If the required flowrate of air is 1 kg/s, what should be the corresponding flow rate of Octane?
Ques 19 GATE 2017
Ques 20 GATE 2017
An aircraft with a turbojet engine, having an inlet area of 1 m2, is flying at 270 m/s at an altitude where the atmospheric pressure is equal to 0.9 bar and the ambient temperature is equal to 290 K. The stagnation pressure and temperature at the exit of the turbine are equal to 1.6 bar and 774 K respectively. The specific heat at constant pressure of the burned gases is equal to 1.147 kJ/kgK and the ratio of specific heats is equal to 1.33. Considering ideal expansion in the nozzle with no losses, the specific thrust produced by the engine is _______ Ns/kg (in one decimal place).
Ques 21 GATE 2017
Air, at 450 K stagnation temperature and at a rate of 50 kg/s, enters the combustor of a turbofan engine and is burned with 1 kg/s of Aviation Kerosene (Heating value 44 MJ/kg). The specific heat at constant pressure for the incoming air and the burned products are 1.005 kJ/kgK and 1.147 kJ/kgK respectively. Considering 100% burner efficiency, the stagnation temperature at the exit of the combustor is equal to _______ K. (in one decimal place).
Ques 22 GATE 2017
A single stage chemical rocket, having an initial mass of 10,000 kg and specific impulse of 450 s, is launched from the surface of the earth and has to reach the escape velocity (11 km/s) at burn out. Consider ge=9.8m/s2 If the atmospheric drag and the effect of gravity are to be neglected, the mass of propellant to be carried by the rocket is equal to _______ kg (in one decimal place).
Ques 23 GATE 2017
A centrifugal compressor requires 1800 kW of power to compress 10 kg/s of air. Consider the whirl velocity component is equal to the impeller speed (ie., no slip) and no losses in the impeller. If the impeller has to rotate at 1900 rad/s. the diameter of the impeller is to be _______ m (in two decimal place).
Ques 24 GATE 2017
Assuming that the aircraft is flying straight, the top spar cap / flange of a wing is most likely to fail in:
Ques 25 GATE 2017
Which of the following statements about the compatibility equations are true:
P. Strain compatibility equations must be satisfied in the solution of three-dimensional problems in elasticity.
Q. Six strains are defined in terms of three displacement functions and can have arbitrary values.
R. Compatibility equations are an expression of the continuity of displacements.
Ques 26 GATE 2017
A batch of aluminium alloy yields in uniaxial tension at the stress of 330 MN/m2. If this material is subjected to the following state of stress: σx=140 MN/m2 σy=-70MN/m2 σz=0, τxy=x MN/m2. τyz=0 and τzx=0 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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