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MCQs

Total Questions : 304 | Page 4 of 31 pages
Question 31. The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)
  1.    L.A.N
  2.    2 L.A.N
  3.    (L.A.N)/60
  4.    (2 L.A.N)/60
 Discuss Question
Answer: Option D. -> (2 L.A.N)/60
Answer: (d).(2 L.A.N)/60
Question 32. The overall efficiency of a reaction turbine is the ratio of
  1.    power produced by the turbine to the energy actually supplied by the turbine
  2.    actual work available at the turbine to the energy imparted to the wheel
  3.    workdone on the wheel to the energy (or head of water) actually supplied to the turbine
  4.    none of the above
 Discuss Question
Answer: Option A. -> power produced by the turbine to the energy actually supplied by the turbine
Answer: (a).power produced by the turbine to the energy actually supplied by the turbine
Question 33. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.
  1.    Yes
  2.    No
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option B. -> No
Answer: (b).No
Question 34. Which of the following turbine is preferred for 0 to 25 m head of water?
  1.    Pelton wheel
  2.    Kaplan turbine
  3.    Francis turbine
  4.    none of these
 Discuss Question
Answer: Option B. -> Kaplan turbine
Answer: (b).Kaplan turbine
Question 35. Work done by a turbine __________ upon the weight of water flowing per second.
  1.    depends
  2.    does not depend
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> depends
Answer: (a).depends
Question 36. In a reciprocating pump, air vessels are used to
  1.    smoothen the flow
  2.    reduce suction head
  3.    increase delivery head
  4.    reduce acceleration head
 Discuss Question
Answer: Option D. -> reduce acceleration head
Answer: (d).reduce acceleration head
Question 37. In a Francis turbine, the pressure at inlet is __________ that at outlet.
  1.    less than
  2.    more than
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option B. -> more than
Answer: (b).more than
Question 38. The impeller of a centrifugal pump may have
  1.    volute casing
  2.    volute casing with guide blades
  3.    vortex casing
  4.    any one of these
 Discuss Question
Answer: Option D. -> any one of these
Answer: (d).any one of these
Question 39. If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
  1.    geometric similarity
  2.    kinematic similarity
  3.    dynamic similarity
  4.    none of these
 Discuss Question
Answer: Option C. -> dynamic similarity
Answer: (c).dynamic similarity
Question 40. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
  1.    0.26
  2.    0.36
  3.    0.46
  4.    0.56
 Discuss Question
Answer: Option C. -> 0.46
Answer: (c).0.46

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