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

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. While starting a centrifugal pump, its delivery valve should be kept___________________?

   A. Opened
   B. Closed
   C. Either opened or closed; it does not make any difference
   D. Either opened or closed; depending on the fluid viscosity

3. 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

4. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?

   A. 10 m
   B. 11 m
   C. 11.8 m
   D. 30 m

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

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

6. 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

7. Remote control valve is a _______________ valve?

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

8. A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?

   A. Increase
   B. Decrease
   C. Remain same
   D. Data insufficient to predict

9. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?

   A. Develops a lower head
   B. Capacity is reduced
   C. Requires more power
   D. All A., B. and C.

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

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