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

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

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

4. Remote control valve is a _______________ valve?

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

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

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

6. Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?

   A. Q/2
   B. Q/4
   C. Q/8
   D. Q/16

7. 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

8. 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

9. A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?

   A. 26
   B. 42
   C. 269
   D. 325

10. While starting an axial flow pump, its delivery valve should be kept _______________?

    A. Open
    B. Closed
    C. Either open or closed
    D. None of these