Check valve is used for ________________ flow?

Related Mcqs:

1. 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

2. For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is___________________?

   A. More
   B. Less
   C. Equal
   D. Either A. or B.; depends on the viscosity of the fluid

3. The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________?

   A. dq/dx = K
   B. dq/dx = K.q
   C. dq/dx = K/q
   D. dq/dx = Kq2

4. The valve used for very remote and accurate control of fluid is a _____________ valve?

   A. Needle
   B. Globe
   C. Gate
   D. Butterfly

5. Remote control valve is a _______________ valve?

   A. Gate
   B. Butterfly
   C. Needle
   D. Globe

6. Foot valve provided in the pump is a ______________ valve?

   A. Direction control
   B. Back pressure
   C. Relief
   D. Pressure reduction

7. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the_______________?

   A. Back flow of fluid in the event of stoppage of pump
   B. Discharge pressure
   C. Flow of liquid during operation of the pump
   D. All A., B. and C.

8. In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?

   A. Discharge of water by a centrifugal pump being run at a constant rpm
   B. Water flow in the suction and discharge pipe of a reciprocating pump
   C. Water discharge from a vertical vessel in which constant level is maintained
   D. Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

9. 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

10. Nature of fluid flow during the opening of a valve in a pipeline is_________________?

    A. Laminar
    B. Unsteady
    C. Steady
    D. Uniform