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CD0078. Pumps and Pumping Operations

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About this collection

The Seagull CBT bank is organised into modules covering safety, shipboard operations, maintenance and other topics. Original module names and codes are retained to help you find the topic you need.

“Seagull CBT — CD0078. Pumps and Pumping Operations” contains 43 questions across 1 collection.

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Sample questions and answers

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What is the main advantage of a double entry centrifugal pump? Select the ONE best answer.

One correct answer

  • It has a lower NPSH required characteristic, giving an advantage in poor suction conditions.✓ Correct answer
  • It gives double the flow rate.
  • It uses only half the input power for the same flow rate.
If a pump had available NPSH of 0.5m would a NPSH requirement of 0.48 be suitable for this purpose?

One correct answer

  • Yes
  • No✓ Correct answer
Is the following statement true or false? 'In centrifugal pump series operation, the flow through all of the pumps is equal'.

One correct answer

  • True✓ Correct answer
  • False
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?

One correct answer

  • 1.1 m
  • 0.7 m
  • 1.4 m✓ Correct answer
  • 0.3 m
Which ONE of the following statements is true?

One correct answer

  • Centrifugal pumps cover the lower ranges of specific speeds, axial flow the higher, and mixed flow the intermediate values✓ Correct answer
  • Centrifugal pumps cover the higher ranges of specific speeds, axial flow the intermediate, and mixed flow the lower values.
  • Centrifugal pumps cover the intermediate ranges of specific speeds, axial flow the higher, and mixed flow the lower values.

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