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

Related Mcqs:

1. 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

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. 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

4. 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

5. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?

   A. A, C, D
   B. B, D, E
   C. A, B, E
   D. A, D, E

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. With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss_______________?

   A. Decreases
   B. Increases
   C. Remain constant
   D. Increases linearly

8. The contraction co-efficient for Borda’s mouthpiece (for frictionless fluid) is__________________?

   A. 0.1
   B. 0.5
   C. 0.94
   D. 1

9. 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

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

    A. 0.61 – 0.63
    B. 0.5 – 0.75
    C. 0.75 – 0.90
    D. 0.35 – 0.55