Lakshya Education MCQs

Question: Which of the following fuels can be used in turbojet engines?
Options:
A. Liquid hydrogen
B. High speed diesel oil
C. Kerosene
D. Methyl alcohol
Answer: Option C
Explanation :

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Question 1. Which of the following statement is correct as regard to centrifugal compressors?
  1.     The flow of air is parallel to the axis of the compressor
  2.     The static pressure of air in the impeller increases in order to provide centripetal force on the air
  3.     The impeller rotates at high speeds
  4.     The maximum efficiency is higher than multistage axial flow compressors
Answer: Option B
Explanation :
Question 2. Ram compression in turbojet involves
  1.     Reduction of speed of incoming air and conversion of part of it into pressure energy
  2.     Compression of inlet air
  3.     Increasing speed of incoming air
  4.     Lost work
Answer: Option A
Explanation :
Question 3. Standard air is the air at ________ and relative humidity of 36 percent.
  1.     0.1 bar and 20°C
  2.     1 bar and 20°C
  3.     0.1 bar and 40°C
  4.     1 bar and 40°C
Answer: Option B
Explanation :
Question 4. To avoid moisture troubles, the branch connections from compressed air lines should be taken from
  1.     Top side of main
  2.     Bottom side of main
  3.     Left side of main
  4.     Right side of main
Answer: Option A
Explanation :
Question 5. A rocket engine uses __________ for the combustion of its fuel.
  1.     Surrounding air
  2.     Compressed atmospheric air
  3.     Its own oxygen
  4.     None of these
Answer: Option C
Explanation :
Question 6. Stalling of blades in axial flow compressor is the phenomenon of
  1.     Air stream blocking the passage
  2.     Motion of air at sonic velocity
  3.     Unsteady periodic and reversed flow
  4.     Air stream not able to follow the blade contour
Answer: Option D
Explanation :

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