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Fluid Mechanics

Q1: Cd for the orifice plate varies from

A 0.58 to 0.8

B 0.93 to 0.98

C 0.2 to 0.3

D 0.02 to 0.03

ANS:A - 0.58 to 0.8

The coefficient of discharge (Cd) for an orifice plate varies typically within the range of 0.58 to 0.8. Here’s an explanation:

  • Orifice Plate: An orifice plate is a device used to measure the rate of fluid flow, typically in pipes. The coefficient of discharge (Cd) for an orifice plate represents the ratio of actual discharge to theoretical discharge (based on the orifice diameter and fluid properties).
  • Variation in Cd: The actual Cd for an orifice plate can vary based on factors such as the design of the plate, the Reynolds number of the flow, the condition of the upstream and downstream pipe sections, and the sharpness of the edges of the orifice. However, in practical applications, Cd values for orifice plates commonly fall within the range of 0.58 to 0.8.
The other ranges provided (0.93 to 0.98, 0.2 to 0.3, 0.02 to 0.03) do not typically represent the coefficient of discharge for standard orifice plates used in fluid flow measurement applications. Therefore, the correct range for Cd for an orifice plate is: 0.58 to 0.8



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