GATE Aeronautical Engineering
Mahatama Gandhi was known for his humility as
he displayed modesty in his interactions.
he worked for humanitarian causes.
he played an important role in humiliating exit of British from India.
he was a fine human being.
If 3 ≤ X ≤ 5 and 8 ≤ Y ≤ 11 then which of the following options is TRUE
3/5 ≤ X/Y ≤ 8/5
3/11 ≤ X/Y ≤ 5/8
3/5 ≤ X/Y ≤ 8/11
3/11 ≤ X/Y ≤ 8/5
An aircraft is flying at Mach number M = 1.5, where the ambient temperature is 250 K. The stagnation temperature of gases at the entry to the nozzle is 800 K. The nozzle is choked and always underexpanded.
Assume the molecular weight of the exhaust gases to be 29, the ratio of specific heats to be 1.4 and the universal gas constant is 8314 J/kmol-K. For which one of the nozzle exit Mach numbers given below is the propulsive efficiency highest
Consider two rockets P and Q fired vertically up with identical specific impulse and a payload of 2 kg. Rocket P has 2 identical stages, and each stage has 200 kg of propellant and 20 kg of structuralweight.
Rocket Q has a single stage with 400 kg of propellant and 40 kg of structuralweight.
Neglecting drag and gravity effects, the ratio of the change in velocity of P to that attained by Q is
In a 50 % reaction axial compressor stage, the local blade velocity is 300 m/s and the axial component of velocity is 100 m/s. If the absolute inlet flow angle α1 = 45o, the work per unit mass done on the fluid by the stage in kJ/kg is
Thrust of liquid oxygen - liquid hydrogen rocket engine is 300 kN. The O/F ratio used is 5. If the fuel mass flow rate is 12.5 kg/s, the specific impulse of the rocket motor in Ns/kg is
A simply supported beam with overhang is loaded by uniformly distributed load of intensity q as shown in thefigure.
The bending moment at the mid-point of AB is
In the steel structure (Young’s modulus = 200 GPa) shown in the figure, all members have a circular cross-section of radius 10 mm. Column BD is pinned at B and
D. The support at A ishinged.
The minimum value of
1200 to 1300
2000 to 2100
1900 to 2000
1800 to 1900
A horizontal rectangular plate ABCD is hinged at points A, B and
C. AC and BD are diagonals of theplate.
Downward force P is applied at
D. The upward reactions RA, RB, and RC at points A, B and C, respectively, are
P, -P, P
P/3, P/3, P/3
0, P, 0
The potential flow model for a storm is represented by the superposition of a sink and avortex.
The stream function can be written in the (r, q) system as u= -A/2∏ q + T/2∏ ln r, where A = T = 100 m2/s. Assume a constant air density of 1.2 kg/m3. The gauge pressure at a distance of 100 m from the storm eye is
A function y(t) satisfies the differential equation d2y/dt2 -2 dy/dt + y = 0 and is subject to the initial conditions y(t = 0) = 0 and dy/dt (t = 0) = 1. The value of y(t =
Given that the Laplace transform, L
(eat) = 1/(s -
a) then L
(e5t sinh 5t)
3s/(s2 - 10s)
3s/(s2 + 10s)
15/(s2 - 10s)
15/(s2 + 10s)
For a given inlet condition, if the turbine inlet temperature is fixed, what value of compressor efficiency given below leads to the lowest amount of fuel added in the combustor of a gas turbine engine
The mass flow rate of air through an aircraft engine is 10 kg/s. The compressor outlet temperature is 400 K and the turbine inlet temperature is 1800 K. The heating value of the fuel is 42 MJ/kg and the specific heat at constant pressure is 1 kJ/kg-K. The mass flow rate of the fuel in kg/s is approximately ___________
0.5 to 0.55
0.3 to 0.35
0.7 to 0.75
0.2 to 0.25
Which one of the following statements is NOT TRUE for a supersonic flow
Over a gradual compression, entropy can remain constant
Over a gradual expansion, entropy remains constant
Over a sharp compression corner, entropy increases
Over a sharp expansion corner, entropy can increase
A supersonic airplane is expected to fly at both subsonic and supersonic speeds during its whole flightcourse.
Which one of the following statements is TRUE
Airplane will experience more stability in pitch at supersonic speeds than at subsonic speeds
Airplane will experience less stability in pitch at supersonic speeds than at subsonic speeds
Pitch stability cannot be inferred from the information given
Airplane will feel no change in pitch stability
The value of is
The integration computed using trapezoidal rule with n = 4 intervals is ____
0.32 to 0.33
0.25 to 0.26
0.22 to 0.23
0.26 to 0.27
The total runs scored by four cricketers P, Q, R, and S in years 2009 and 2010 are given in the following table: The player with the lowest percentage increase in total runs is
(4, p) and (0, q) lie on a straight line having a slope of 3/4. The value of (p – q) is
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