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Pumps and Pumping Operations

CBT 33 questions

First 5 of 33 questions — with answers

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  1. Question 1

    A pump is to be used to pump fresh water at a temperature, where the vapour pressure of the water is equivalent to the pressure caused by 0,2 m head of fresh water, and atmospheric pressure is equivalent to 10,6 m head of fresh water. The maximum suction lift is 6,0 m, and the pipeline losses on the suction side are equivalent to a head of 3,0 m. What will the pump NPSH available be?
    • 1,1 m.
    • 0,7 m.
    • 1,4 m.
    • 0,3 m.

  2. Question 2

    Cavitation of the fluid in a centrifugal pump is caused by:
    • Too high a speed of impeller rotation creating adverse heat.
    • The vapour pressure in the suction pipe falls below the vapour pressure of the liquid at a given temperature.
    • The viscosity of the fluid is too high, the extra power absorbed being converted into heat.

  3. Question 3

    If NPSHA is too small, how can it be increased? Select the ONE correct answer:
    • Run the pump faster.
    • Reduce the length of the suction side pipe work.
    • Throttle the suction valve.
    • Use a priming pump.

  4. Question 4

    If a pump had available NPSH of 0,5 m would a NPSH requirement of 0,48 be suitable for this purpose?
    • Yes.
    • No.

  5. Question 5

    If a pump has a NPSH requirement of 0,5 m, would an available NPSH of 0,45 m be suitable?
    • Yes.
    • No.

Preview — 5 of 33 questions

You are seeing the first 5 questions with answers. Unlock the remaining 28 to study the whole test — online or offline.

About this CBT test

Pumps and Pumping Operations is a CBT test with 33 questions and verified answers. Common topics include: centrifugal pump, positive displacement, pumps parallel, fresh water, npsh, delivery, main, flow.

You can practise the free questions online — one at a time, with the correct answer — or unlock the whole test and download it to study offline, without internet.

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