Hydraulic Machines MCQs with answers Page - 17

Here, you will find a collection of MCQ questions on Hydraulic Machines. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. The initial setting time of rapid hardening cement should not be less than ?

  • (A) 30 min
  • (B) 1 hour
  • (C) 4 hours
  • (D) 8 hours

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Q. The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as ?

  • (A) normal speed
  • (B) unit speed
  • (C) specific speed
  • (D) none of these

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Q. Discharge of a centrifugal pump ?

  • (A) directly proportional to diameter of its impeller
  • (B) inversely proportional to diameter of its impeller
  • (C) directly proportional to (diameter)2 of its impeller
  • (D) inversely proportional to (diameter)2 of its impeller

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Q. Geometric similarity is said to exist between the model and the prototype, if both of them ?

  • (A) have identical velocities
  • (B) are equal in size and shape
  • (C) are identical in shape, but differ only in size
  • (D) have identical forces

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Q. The number of buckets on the periphery of a Pelton wheel is given by ?

  • (A) (D / 2d) + 5
  • (B) (D / 2d) + 10
  • (C) (D / 2d) + 15
  • (D) (D / 2d) + 20

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Q. The working of which of the following hydraulic units is based on Pascal's law ?

  • (A) Air lift pump
  • (B) Jet pump
  • (C) Hydraulic coupling
  • (D) Hydraulic press

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Q. Overall efficiency of a centrifugal pump is the ratio of ?

  • (A) energy available at the impeller to the energy supplied to the pump by the prime mover
  • (B) actual workdone by the pump to the energy supplied to the pump by the prime mover
  • (C) energy supplied to the pump to the energy available at the impeller
  • (D) manometric head to the energy supplied by the impeller per kN of water

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Q. A hydraulic press is a device used ?

  • (A) to store pressure energy which may be supplied to a machine later on
  • (B) to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
  • (C) to lift larger load by the application of a comparatively much smaller force
  • (D) all of the above

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Q. A hydraulic ram is a device used to ?

  • (A) store the energy of water
  • (B) increase the pressure of water
  • (C) to lift water from deep wells
  • (D) to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

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Q. The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. 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 mixed flow at outlet

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