AEROSPACE ENGINEERING OBJECTIVE QUESTIONS

*1 Which one of the following statements is NOT TRUE for a supersonic flow?
A) Over a gradual expansion, entropy remains constant
B) Over a sharp expansion corner, entropy can increase
C) Over a gradual compression, entropy can remain constant
D) Over a sharp compression corner, entropy increases

*2 A supersonic airplane is expected to fly at both subsonic and supersonic speeds during its whole
flight course. Which one of the following statements is TRUE?
(A) Airplane will experience less stability in pitch at supersonic speeds than at subsonic speeds
(B) Airplane will feel no change in pitch stability
(C) Airplane will experience more stability in pitch at supersonic speeds than at subsonic speeds
(D) Pitch stability cannot be inferred from the information given


*3 Which one of the following criteria leads to maximum turn rate and minimum radius in a level turn
flight?
A) Highest possible load factor and highest possible velocity
B) Lowest possible load factor and lowest possible velocity
C) Highest possible load factor and lowest possible velocity
D) Lowest possible load factor and highest possible velocity
E) None of the above

*4. Which one of the following is favorable for an airplane operation?
A) Tail wind in cruise and head wind in landing
B) Tail wind both in cruise and landing
C) Head wind both in cruise and landing
D) Head wind in cruise and tail wind in landing
E) None of the above
*5. Consider two engines P and Q. In P, the high pressure turbine blades are cooled with a bleed of 5%
from the compressor after the compression process and in Q the turbine blades are not cooled.
Comparing engine P with engine Q, which one of the following is NOT TRUE?
A) Turbine inlet temperature is higher for engine P
B) Specific thrust is higher for engine P
C) Compressor work is the same for both P and Q
D) Fuel flow rate is lower for engine P
*6. Which one of the following flight instruments is used on an aircraft to determine its attitude in
flight?
A) Vertical speed indicator
B) Altimeter
C) Artificial Horizon
D) Turn-bank indicator

*7. Which one of the following is TRUE with respect to Phugoid mode of an aircraft?
A) Frequency is directly proportional to flight speed
B) Frequency is inversely proportional to flight speed
C) Frequency is directly proportional to the square root of flight speed
D) Frequency is inversely proportional to the square root of flight speed

*8. A gas turbine engine is mounted on an aircraft which can attain a maximum altitude of 11 km from
sea level. The combustor volume of this engine is decided based on conditions at
A) sea level
B) 8 km altitude
C) 5.5 km altitude
D) 11 km altitude
E) None of the above

*9. 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) 3800
B) 4800
C) 4200
D) 4100
E) None of the above

*10. all speed of the airplane in m/s is
A) 18.39
B) 36.24
C) 45.52
D) 119.46
E) None of the above

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