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

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. 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

4. The percentage slip in a reciprocating pump set is given by the % of (where, Q1 = actual discharge Q2 = theoretical discharge) ?

   A. Q1/Q2
   B. Q2/Q1
   C. (Q2 – Q1)/Q1
   D. (Q2 – Q1)/Q2

5. 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

6. 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

7. 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

8. The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by_____________________?

   A. Cv . √(2gH)
   B. Cc . √(2gH)
   C. Cd . √(2gH)
   D. Cv . Va

9. For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________?

   A. √(2gh)
   B. C.V. √(2gh)
   C. Cd √(2gh)
   D. Cc √(2gh)

10. 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