Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________?
Correct answer: B. 0.62
- A. 0.42
- B. 0.62
- C. 0.82
- D. 0.98
Explanation
For a sharp-edged orifice, contraction and nonideal velocity effects combine to give a discharge coefficient of about 0.61 to 0.62. Values near 0.98 are typical of much less restrictive flow meters, not ordinary orifices.
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