Hydraulic Machines MCQs with answers Page - 15

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 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

A

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Q. Discharge of a centrifugal pump is

  • (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

A

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Q. In an outward flow reaction turbine

  • (A) the water flows parallel to the axis of the wheel
  • (B) the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
  • (C) the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
  • (D) the flow of water is partly radial and partly axial

A

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Q. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

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

A

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Q. The power of a centrifugal pump working under constant head and discharge increases with the speed.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

A

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Q. A reciprocating pump is suitable for less discharge and higher heads.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

A

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Q. The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.

  • (A) True
  • (B) False
  • (C) ---
  • (D) ---

A

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Q. The speed ratio in case of Francis turbine varies from

  • (A) 0.15 to 0.3
  • (B) 0.4 to 0.5
  • (C) 0.6 to 0.9
  • (D) 1 to 15

A

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Q. Multi-stage centrifugal pumps are used to

  • (A) give high discharge
  • (B) produce high heads
  • (C) pump viscous fluids
  • (D) all of these

A

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Q. If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

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