Hydraulic Machines MCQs with answers Page - 21

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Q. For 450 m head of water.............. shall be used ?

  • (A) Pelton wheel
  • (B) Kaplan turbine
  • (C) Francis turbine
  • (D) none of these

A

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Q. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is ?

  • (A) slow speed with radial flow at outlet
  • (B) medium speed with radial flow at outlet
  • (C) high speed with radial flow at outlet
  • (D) high speed with axial flow at outlet

A

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Q. Slip of a reciprocating pump is defined as the ?

  • (A) ratio of actual discharge to the theoretical discharge
  • (B) sum of actual discharge and the theoretical discharge
  • (C) difference of theoretical discharge and the actual discharge
  • (D) product of theoretical discharge and the actual discharge

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Q. The hydraulic efficiency of a reaction turbine, is the ratio of ?

  • (A) power produced by the turbine to the energy actually supplied by the turbine
  • (B) actual work available at the turbine to energy imparted to the wheel
  • (C) work done on the wheel to the energy (or head of water) actually supplied to the turbine
  • (D) none of the above

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Q. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is ?

  • (A) slow speed pump with radial flow at outlet
  • (B) medium speed pump with radial flow at outlet
  • (C) high speed pump with radial flow at outlet
  • (D) high speed pump with axial flow at outlet

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Q. If the ratios of the corresponding forces acting at corresponding points are equal, then model and the prototype are said to have ?

  • (A) geometric similarity
  • (B) kinematic similarity
  • (C) dynamic similarity
  • (D) none of these

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Q. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which ?

  • (A) delivers unit discharge under unit head
  • (B) delivers unit discharge under unit speed
  • (C) develops unit power under unit head
  • (D) develops unit power under unit speed

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Q. In order to avoid cavitation in centrifugal pumps ?

  • (A) the suction pressure should be high
  • (B) the delivery pressure should be high
  • (C) the suction pressure should be low
  • (D) the delivery pressure should be low

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Q. Which of the following statement is correct as regard to water wheels ?

  • (A) They have slow speeds
  • (B) They are suitable even for low water heads
  • (C) They give constant efficiency, even if the discharge is not constant
  • (D) all of the above

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Q. A double overhung Pelton wheel has ?

  • (A) two jets
  • (B) two runners
  • (C) four jets
  • (D) four runners

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