Hydraulic Machines MCQs with answers Page - 23

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A

Admin • 802.91K Points
Coach

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. The hydraulic efficiency of an impulse turbine is the ?

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

A

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Q. Braking jet in an impulse turbine is used ?

  • (A) to break the jet of water
  • (B) to bring the runner to rest in a short time
  • (C) to change the direction of runner
  • (D) none of these

A

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Q. Which of the following pump is suitable for small discharge and high heads ?

  • (A) Centrifugal pump
  • (B) Axial flow pump
  • (C) Mixed flow pump
  • (D) Reciprocating pump

A

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Q. Power required to drive a centrifugal pump is directly proportional to ......... of its impeller ?

  • (A) diameter
  • (B) square of diameter
  • (C) cube of diameter
  • (D) fourth power of diameter

A

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Q. In a reciprocating pump, air vessels are used to ?

  • (A) smoothen the flow
  • (B) reduce suction head
  • (C) increase delivery head
  • (D) reduce acceleration head

A

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Q. Which of the following statement is correct ?

  • (A) The centrifugal pump is suitable for large discharge and smaller heads
  • (B) The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump
  • (C) The efficiency of centrifugal pump is less as compared to reciprocating pump
  • (D) all of the above

A

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Q. Mechanical 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 work done 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

A

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Q. The cavitation in reaction turbines is avoided, to a great extent by ?

  • (A) installing the turbine below the tail race level
  • (B) using stainless steel runner of the turbine
  • (C) providing highly polished blades to the runner
  • (D) all of the above

A

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Q. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is ?

  • (A) 0.26
  • (B) 0.36
  • (C) 0.46
  • (D) 0.56

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