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MCQs

Total Questions : 164 | Page 6 of 17 pages
Question 51. In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.
  1.    Correct
  2.    Incorrect
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Correct
Answer: (a).Correct
Question 52. Euler's equation can be used for
  1.    radial flow compressors
  2.    axial flow compressors
  3.    pumps
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 53. 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
 Discuss Question
Answer: Option C. -> its own oxygen
Answer: (c).its own oxygen
Question 54. A closed cycle gas turbine consists of a
  1.    compressor
  2.    heating chamber
  3.    cooling chamber
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 55. The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.
  1.    Agree
  2.    Disagree
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Agree
Answer: (a).Agree
Question 56. For maximum work, the reheating should be done to an intermediate pressure of (where p1 = Maximum pressure, and p2 = Minimum pressure)
  1.    (p₁ - p₂)/2
  2.    (p₁ + p₂)/2
  3.    p₁/p₂
  4.    p₁ p₂
 Discuss Question
Answer: Option D. -> p₁ p₂
Answer: (d).p₁ p₂
Question 57. 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
 Discuss Question
Answer: Option B. -> less than
Answer: (b).less than
Question 58. If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
  1.    D1/D2 = (p1p3)1/2
  2.    D1/D2 = (p1/p3)1/4
  3.    D1/D2 = (p1p3)1/4
  4.    D1/D2 = (p3/p1)1/4
 Discuss Question
Answer: Option D. -> D1/D2 = (p3/p1)1/4
Answer: (d).D1/D2 = (p3/p1)1/4
Question 59. The pressure ratio in a centrifugal compressor can be increased by increasing the tip speed and lowering the inlet temperature.
  1.    Correct
  2.    Incorrect
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Correct
Answer: (a).Correct
Question 60. The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p1 = Intake pressure of air, p2 = Intercooler pressure, and p3 = Delivery pressure of air)
  1.    p2 = p1 x p3
  2.    p2 = p1/p3
  3.    p2 = p1 x p3
  4.    p2 = p3/p1
 Discuss Question
Answer: Option C. -> p2 = p1 x p3
Answer: (c).p2 = p1 x p3

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