What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5) ?

Related Mcqs:

1. 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__________________?

   A. 0.42
   B. 0.62
   C. 0.82
   D. 0.98

2. Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity)?

   A. Cd = Cc/Cv
   B. Cd = Cc.Cv
   C. Cd = Cv/ Cc
   D. None of these

3. The ratio of actual discharge to theoretical discharge through an orifice is equal to______________?

   A. Cc . Cv
   B. Cc . Cd
   C. Cv . Cd
   D. Cd/Cv

4. The discharge co-efficient for an orifice meter does not depend upon the ___________________?

   A. Pipe length
   B. Ratio of pipe diameter to orifice diameter
   C. Type of orifice & the Reynolds number
   D. Pipe diameter

5. With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost________________?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Increases exponentially

6. For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?

   A. Increase
   B. Decrease
   C. Remain constant
   D. Either A. or B.; depends on other factors

7. What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ?

   A. 0.64
   B. 1.65
   C. 0.32
   D. 0.94

8. The fluid jet discharging from a 2″ diameter orifice has a diameter of 1.75″ at its venacontracta. The co-efficient of contraction is___________________?

   A. 1.3
   B. 0.766
   C. 0.87
   D. None of these

9. The maximum discharge through a circular channel takes place, when the depth of the fluid flow is ______________ times the pipe diameter?

   A. 0.25
   B. 0.5
   C. 0.66
   D. 0.95

10. The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is________________?

    A. 0.1
    B. 0.55
    C. 0.95
    D. 1.85