Lakshya Education MCQs

Question: For minimum work required to compress and deliver a quantity of air by multistage compression
A.The compression ratio in each stage should be same
B.The intercooling should be perfect
C.The work-done in each stage should be same
D.All of the above
Answer: Option D

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More Questions on This Topic :

Question 1. Pick up the wrong statement about advantages of multistage compression
  1.    Better lubrication is possible advantages of multistage
  2.    More loss of air due to leakage past the cylinder
  3.    Mechanical balance is better
  4.    Air can be cooled perfectly in between
Answer: Option B
Question 2. Which is false statement about advantages of multistage compressor in comparison to single stage compressor?
  1.    Less power requirement
  2.    Better mechanical balance
  3.    Less loss of air due to leakage past the cylinder
  4.    Lower volumetric efficiency
Answer: Option D
Question 3. In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as
  1.    Work factor
  2.    Slip factor
  3.    Degree of reaction
  4.    Pressure coefficient
Answer: Option C
Question 4. A closed gas turbine in which fuel is burnt directly in the air is not possible because of
  1.    Paucity of O2
  2.    Increasing gas temperature
  3.    High specific volume
  4.    High friction losses
Answer: Option A
Question 5. The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.
  1.    Equal to
  2.    Less than
  3.    More than
  4.    None of these
Answer: Option B
Question 6. Clearance volume in actual reciprocating compressors is essential
  1.    To accommodate Valves in the cylinder head
  2.    To provide cushioning effect
  3.    To attain high volumetric efficiency
  4.    To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
Answer: Option D

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