Vena-contracta pressure tapping is at a distance _______________ from the position of an orificemeter fitted in a pipe of internal diameter ‘d’ ?

Related Mcqs:

1. 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

2. Vena-contracta formed during flow of a liquid through an orificemeter has__________________?

   A. Minimum liquid cross-section
   B. More diameter compared to orifice diameter
   C. Minimum velocity of fluid stream
   D. None of these

3. Location of vena-contracta in an orificemeter does not depend upon the________________?

   A. Type of orifice
   B. Density, viscosity & compressibility of the fluid
   C. Ratio of pipe diameter to orifice diameter
   D. Pipe roughness

4. 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

5. A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?

   A. 17
   B. 42
   C. 84
   D. 1.8

6. 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

7. 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

8. 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)

9. A 2″ gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is__________________?

   A. Δp
   B. < Δp
   C. > Δp
   D. Δp2

10. The pressure drop per unit length of pipe incurred by a fluid ‘X’ flowing through pipe is Δp. If another fluid ‘Y’ having both the specific gravity & density just double of that of fluid ‘X’, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?

    A. Δp
    B. 2Δp
    C. Δp2
    D. Δp/2