Questions and answers for exam Preparation

MCQs

Total Questions : 104 | Page 8 of 11 pages

Question 71. The general solution of the differential equation dy/dx - 2√y = 0 is

y âˆ’ √x + C = 0
y âˆ’ x + C = 0
√y âˆ’ √x + C = 0
√y âˆ’ x + C = 0

Discuss Question

Answer: Option D. -> √y âˆ’ x + C = 0

-NA-

Question 72. The ratio of flight speed to the exhaust velocity for maximum propulsion efficiency is

Discuss Question

Answer: Option C. -> 1.0

-NA-

Question 73. In a semi-monocoque construction of an aircraft wing, the skin and spar webs are the primary carriers of

shear stresses due to an aerodynamic moment component alone.
normal (bending) stresses due to aerodynamic forces.
shear stresses due to aerodynamic forces alone.
shear stresses due to aerodynamic forces and a moment component.

Discuss Question

Answer: Option D. -> shear stresses due to aerodynamic forces and a moment component.

-NA-

Question 74. 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

Discuss Question

Answer: Option D. -> 2.0

-NA-

Question 75. The ideal static pressure coefficient of a diffuser with an area ratio of 2.0 is

0.25
0.50
0.75
1.0

Discuss Question

Answer: Option D. -> 1.0

-NA-

Question 76. A rocket is to be launched from the bottom of a very deep crater on Mars for earth return. The specific impulse of the rocket, measured in seconds, is to be normalized by the acceleration due to gravity at

the bottom of the crater on Mars.
Mars standard sea level".
earth's standard sea level.
the same depth of the crater on earth.

Discuss Question

Answer: Option C. -> earth's standard sea level.

-NA-

Question 77. An aircraft has a steady rate of climb of 300 m/s at sea level and 150 m/s at 2500 m altitude. 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
15 to 16
16 to 17

Discuss Question

Answer: Option A. -> 13 to 14

-NA-

Question 78. The mode shapes of an un-damped two degrees of freedom system are {1 0.5 } T and {1 -0.675 } T . The corresponding natural frequencies are 0.45 Hz and 1.2471 Hz. The maximum amplitude (in mm) of vibration of the first degree of freedom due to an initial displacement of {2 1}T (in mm) and zero initial velocities is ____.

Discuss Question

Answer: Option D. -> 2

-NA-

Question 79. The nth derivative of the function y = 1/(x + 3) is

[(-1)n n!]/(x + 3)n+1
[(-1)n+1 n!]/(x + 3)n+1
[(-1)n (n+1)!]/(x + 3)n
[(-1)n n!]/(x + 3)n

Discuss Question

Answer: Option A. -> [(-1)n n!]/(x + 3)n+1

-NA-

Question 80. An airfoil generates a lift of 80 N when operating in a freestream flow of 60 m/s. If the ambient pressure and temperature are 100 kPa and 290 K respectively (specific gas constant is 287 J/kg-K), the circulation on the airfoil in m2/s is ____.