The ratio of the actual discharge from an orifice to the theoretical discharge from the orifice, is known as

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JKSSB JE Civil Jal Shakti 6 Dec 2022 Official Paper (Shift 2)
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  1. Co-efficient of discharge, Cd
  2. Co-efficient of contraction, Cc
  3. Co-efficient of velocity, Cv
  4. None of these

Answer (Detailed Solution Below)

Option 1 : Co-efficient of discharge, Cd
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Explanation:

Co-efficient of contraction (Cc):

  • It is defined as the ratio of the area of the jet at vena-contracta to the area of the orifice.

\(C_{c}=\frac{A_{c}}{A}\)

Coefficient of velocity (Cv):

  • It is defined as the ratio between the actual velocity of a jet of liquid at vena contracta and the theoretical velocity of jet. It is denoted by Cv.

\(C_{v}=\frac{V}{\sqrt{2gH}}\)

The value of Cv varies from 0.95 to 0.99.

Co-efficient of Discharge (Cd):

  • It is defined as the ratio of the actual discharge from an orifice to the theoretical discharge from the orifice.

\(C_{d}=\frac{V_{act}}{V_{th}}\)

By the relation
Cd = Cc x Cv

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