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MCQs

Total Questions : 3218 | Page 6 of 322 pages
Question 51. Which of the following produces maximum pressure difference for transportation of gases?
  1.    Vaccum pumps
  2.    Blowers
  3.    Fans
  4.    Compressors
 Discuss Question
Answer: Option D. -> Compressors
Question 52. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.
  1.    10 m
  2.    11 m
  3.    12 m
  4.    20 m
 Discuss Question
Answer: Option B. -> 11 m
Question 53. The nominal size of a hose pipe is specified by its
  1.    I.D.
  2.    O.D.
  3.    Thickness
  4.    None of these
 Discuss Question
Answer: Option A. -> I.D.
Question 54. Rise of liquid in a capillary tube is due to
  1.    Cohesion
  2.    Adhesion
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 55. The normal stress is the same in all directions at a point in a fluid, when the fluid is
  1.    Non-viscous
  2.    Incompressible
  3.    Both A and B
  4.    Having no motion of one fluid layer relative to the other
 Discuss Question
Answer: Option D. -> Having no motion of one fluid layer relative to the other
Question 56. Interstage coolers are provided in a multistage compressor to
  1.    Save power in compressing a given volume to a given pressure
  2.    Cool the delivered air
  3.    Achieve the exact delivery pressure
  4.    None of these
 Discuss Question
Answer: Option A. -> Save power in compressing a given volume to a given pressure
Question 57. Purpose of relief valve in a reciprocating pump is to
  1.    Protect the pump against developing excessive pressure
  2.    Facilitate unidirectional flow of liquid
  3.    Reduce the discharge pressure
  4.    Control the rate of discharge
 Discuss Question
Answer: Option A. -> Protect the pump against developing excessive pressure
Question 58. Function of air vessel provided in a reciprocating pump is to
  1.    Reduce discharge fluctuation
  2.    Reduce the danger of cavitation
  3.    Avoid the necessity of priming
  4.    Increase the pump efficiency
 Discuss Question
Answer: Option A. -> Reduce discharge fluctuation
Question 59. The speed of sound in an ideal gas varies as the
  1.    Temperature
  2.    Pressure
  3.    Density
  4.    None of these
 Discuss Question
Answer: Option A. -> Temperature
Question 60. The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the
  1.    Length is shorter
  2.    Throat diameter is more
  3.    Sudden expansion of flow in the downstream occurs
  4.    Distance between the throat and the inlet is more
 Discuss Question
Answer: Option C. -> Sudden expansion of flow in the downstream occurs

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