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MCQs

Total Questions : 765 | Page 5 of 77 pages
Question 41. The performance of air compressor at high altitudes will be ________ as compared to that at sea level.
  1.    Same
  2.    Lower
  3.    Higher
  4.    None of these
 Discuss Question
Answer: Option B. -> Lower
Question 42. Maximum work is done in compressing air when the compression is
  1.    Isothermal
  2.    Adiabatic
  3.    Polytropic
  4.    None of the above
 Discuss Question
Answer: Option B. -> Adiabatic
Question 43. The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature
  1.    0.1%
  2.    0.5%
  3.    1%
  4.    5%
 Discuss Question
Answer: Option C. -> 1%
Question 44. The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is
  1.    Less
  2.    More
  3.    Same
  4.    More/less depending on compressor capacity
 Discuss Question
Answer: Option B. -> More
Question 45. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at
  1.    Diffuser inlet radius
  2.    Diffuser outlet radius
  3.    Impeller inlet radius
  4.    Impeller outlet radius
 Discuss Question
Answer: Option B. -> Diffuser outlet radius
Question 46. If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by
  1.    1 - k + k (p₁/p₂)1/n
  2.    1 + k - k (p₂/p₁)1/n
  3.    1 - k + k (p₁/p₂) n- 1/n
  4.    1 + k - k (p₂/p₁) n-1/n
 Discuss Question
Answer: Option B. -> 1 + k - k (p₂/p₁)1/n
Question 47. Axial flow compressor has the following advantage over centrifugal compressor
  1.    Larger air handling ability per unit frontal area
  2.    Higher pressure ratio per stage
  3.    Aerofoil blades are used
  4.    Higher average velocities
 Discuss Question
Answer: Option A. -> Larger air handling ability per unit frontal area
Question 48. The pressure ratio of an ideal vaned compressor with increase in mass flow rate
  1.    Increases
  2.    Decreases
  3.    Remain constant
  4.    First decreases and then increases
 Discuss Question
Answer: Option C. -> Remain constant
Question 49. The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio
  1.    Increases
  2.    Decreases
  3.    First increases and then decreases
  4.    First decreases and then increases
 Discuss Question
Answer: Option A. -> Increases
Question 50. The effective power of gas turbines is increased by adding the following in compressor
  1.    Ammonia and water vapour
  2.    Carbon dioxide
  3.    Nitrogen
  4.    Hydrogen
 Discuss Question
Answer: Option A. -> Ammonia and water vapour

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