The reciprocal of coefficient of fluctuation of speed is known as ______

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NHPC JE Mechanical 6 April 2022 (Shift 2) Official Paper
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  1. coefficient of vibration
  2. coefficient of readiness
  3. coefficient of steadiness
  4. coefficient of energy

Answer (Detailed Solution Below)

Option 3 : coefficient of steadiness
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Detailed Solution

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Explanation:

Maximum fluctuation of speed:

The difference between the maximum and minimum speeds during a cycle is called the maximum fluctuation of speed.

Co-efficient of fluctuation of speed:

The ratio of the maximum fluctuation of speed to the mean speed is called the coefficient of fluctuation of speed.

Co-efficient of steadiness:

The reciprocal of the coefficient of fluctuation of speed is known as the coefficient of steadiness.

Let  and  = Maximum and minimum speeds in r.p.m. during the cycle

 = Mean speed in r.p.m. 

Co-efficient of fluctuation of speed:

Co-efficient of steadiness:

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