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MCQs

Total Questions : 765 | Page 7 of 77 pages
Question 61. The most efficient method of compressing air is to compress it
  1.    Isothermally
  2.    Adiabatically
  3.    Isentropically
  4.    Isochronically
 Discuss Question
Answer: Option A. -> Isothermally
Question 62. In a high pressure compressor, the delivery pressure is
  1.    1 to 5 bar
  2.    5 to 8 bar
  3.    8 to 10 bar
  4.    10 to 15 bar
 Discuss Question
Answer: Option C. -> 8 to 10 bar
Question 63. The capacity of compressor will be highest when its intake temperature is
  1.    Lowest
  2.    Highest
  3.    Anything
  4.    Atmospheric
 Discuss Question
Answer: Option D. -> Atmospheric
Question 64. For slow speed large capacity compressor, following type of valve will be best suited
  1.    Poppet valve
  2.    Mechanical valve of the Corliss, sleeve, rotary or semi rotary type
  3.    Disc or feather type
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Disc or feather type
Question 65. It is not possible to use closed gas turbine cycle in aeronautical engines because
  1.    It is inefficient
  2.    It is bulky
  3.    It requires cooling water for its operation
  4.    None of the above
 Discuss Question
Answer: Option C. -> It requires cooling water for its operation
Question 66. In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.
  1.    Inlet whirl velocity
  2.    Outlet whirl velocity
  3.    Inlet velocity of flow
  4.    Outlet velocity of flow
 Discuss Question
Answer: Option D. -> Outlet velocity of flow
Question 67. An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes
  1.    One adiabatic, two isobaric, and one constant volume
  2.    Two adiabatic and two isobaric
  3.    Two adiabatic, one isobaric and one constant volume
  4.    One adiabatic, one isobaric and two constant volumes
 Discuss Question
Answer: Option A. -> One adiabatic, two isobaric, and one constant volume
Question 68. In which case the air-fuel ratio is likely to be maximum?
  1.    Gas turbine
  2.    4-stroke petrol engine
  3.    4-stroke diesel engine
  4.    Multi cylinder engine
 Discuss Question
Answer: Option A. -> Gas turbine
Question 69. A compressor at high altitude will draw
  1.    More power
  2.    Less power
  3.    Same power
  4.    More/less power depending on other factors
 Discuss Question
Answer: Option B. -> Less power
Question 70. With the decrease in compression ratio, the volumetric efficiency
  1.    Does not change
  2.    Increases
  3.    Decreases
  4.    First decrease and then increase
 Discuss Question
Answer: Option B. -> Increases

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