Q. The highest limit load factor experienced by a civil transport aircraft is in the range (A) 0.0 – 2.0 (B) 2.0 – 5.0 (C) 5.0 – 8.0 (D) 8.0 – 10.0 Ans: 2.0 – 5.0
The highest limit load factor experienced by a civil transport aircraft is in the range Read More »
Q. A shock wave is moving into still air in a shock tube. Which one of the following happens to the air? (A) static temperature increases, total temperature remains constant. (B) static temperature increases, total temperature increases. (C) static temperature increases, total temperature decreases. (D) static pressure increases, total temperature remains constant. Ans: static temperature
Q. A thermocouple, mounted flush in an insulated flat surface in a supersonic laminar flow of air measures the (A) static temperature. (B) temperature greater than static but less than total temperature. (C) total temperature. (D) temperature greater than total temperature. Ans: temperature greater than static but less than total temperature.
Q. In a low-speed wind tunnel, the angular location(s) from the front stagnation point on a circular cylinder where the static pressure equals the free-stream static pressure, is (A) ± 380 (B) ± 300 (C) ± 600 (D) 00 Ans: ± 300
Q. The pitching moment of a positively cambered NACA airfoil about its leading edge at zero- lift angle of attack is (A) negative. (B) positive. (C) indeterminate. (D) zero. Ans: negative
Q. In an elliptic orbit around any planet, the location at which a spacecraft has the maximum angular velocity is (A) apoapsis. (B) periapsis. (C) a point at +45o from periapsis. (D) a point at -90o from apoapsis. Ans: periapsis
Q. The velocity profile in an incompressible, laminar boundary layer is shown in the figure below. U is the free-stream velocity, u(y) is the stream-wise velocity component. The area of the black shaded region in the figure below represents the (A) boundary layer thickness. (B) momentum thickness. (C) displacement thickness. (D) shape factor. Ans: displacement
Q. An airplane requires a longer ground roll to lift-off on hot summer days because (A) the thrust is directly proportional to free-stream density. (B) the thrust is directly proportional to weight of the aircraft. (C) the lift-off distance is directly proportional to free-stream density. (D) the runway friction is high on hot summer days.
An airplane requires a longer ground roll to lift-off on hot summer days because Read More »
Q. A NACA 0012 airfoil has a trailing edge flap. The airfoil is operating at an angle of attack of 5 degrees with un-deflected flap. If the flap is now deflected by 5 degrees downwards, the 𝐶𝐿 versus 𝛼 curve (A) shifts right and slope increases. (B) shifts left and slope increases. (C) shifts left
Q. 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 (A) pitch, nose up. (B) roll with the starboard wing up. (C) pitch, nose down. (D) roll with the port wing up. Ans: roll
