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

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. 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

3. 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

4. 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

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

   A. d
   B. 0.5 d
   C. 2d
   D. 4d

6. 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

7. 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

8. 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

9. 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

10. What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ?

    A. Penstock
    B. Siphon
    C. Tunnel
    D. Pressure pipeline