Mechanical Engineering Exam > Mechanical Engineering Questions > When the speed of a centrifugal pump is doubl...
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When the speed of a centrifugal pump is doubled, the power requiredto drive the pump will:
- a)Increase 8 times
- b)Increase 4 times
- c)Double
- d)Remain the same
Correct answer is option 'A'. Can you explain this answer?
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When the speed of a centrifugal pump is doubled, the power requiredto ...
Ans. (a)
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When the speed of a centrifugal pump is doubled, the power requiredto ...
Explanation:
When the speed of a centrifugal pump is doubled, the power required to drive the pump will increase 8 times. This can be explained by the following factors:
1. Affinity laws: The affinity laws state that the flow rate, head, and power required by a centrifugal pump are proportional to the cube, square, and cube of the speed respectively. Doubling the speed of the centrifugal pump will increase the flow rate and head by a factor of 2³=8 and 2²=4 respectively. However, the power required to drive the pump will increase by a factor of 2³=8.
2. Pump curve: The pump curve is a graphical representation of the relationship between the flow rate and head of a centrifugal pump. The pump curve is affected by the speed of the pump. Doubling the speed of the pump will shift the pump curve upwards and to the left. This means that the pump will operate at a higher flow rate and head, requiring more power to drive it.
Therefore, when the speed of a centrifugal pump is doubled, the power required to drive the pump will increase 8 times due to the affinity laws and the pump curve.
When the speed of a centrifugal pump is doubled, the power required to drive the pump will increase 8 times. This can be explained by the following factors:
1. Affinity laws: The affinity laws state that the flow rate, head, and power required by a centrifugal pump are proportional to the cube, square, and cube of the speed respectively. Doubling the speed of the centrifugal pump will increase the flow rate and head by a factor of 2³=8 and 2²=4 respectively. However, the power required to drive the pump will increase by a factor of 2³=8.
2. Pump curve: The pump curve is a graphical representation of the relationship between the flow rate and head of a centrifugal pump. The pump curve is affected by the speed of the pump. Doubling the speed of the pump will shift the pump curve upwards and to the left. This means that the pump will operate at a higher flow rate and head, requiring more power to drive it.
Therefore, when the speed of a centrifugal pump is doubled, the power required to drive the pump will increase 8 times due to the affinity laws and the pump curve.
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When the speed of a centrifugal pump is doubled, the power requiredto ...
Unit power of a pump is P/N^3×D^5 If N doubles power will be 8 times more than original.
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