During the opening of a valve in a pipe line, the flow is_________________?

Related Mcqs:

1. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________?

   A. 2.4 m above the hydraulic gradient
   B. 6.4 m above the hydraulic gradient
   C. 10.0 m above the hydraulic gradient
   D. 5.0 above the hydraulic gradient
   E. none of the above

2. The safety valve at superheater as compared to drum safety valve setting is set at___________________?

   A. higher value
   B. lower value
   C. same value
   D. any value
   E. none of the above

3. The safety valve on boiler drum compared to safety valve on super heater is set at ________________?

   A. same value
   B. higher value
   C. lower value
   D. lower/higher depending on steam flow
   E. unpredicatble

4. Flow occurring in a pipeline when a valve is being opened is________________?

   A. steady
   B. unsteady
   C. laminar
   D. vortex
   E. rotational

5. What is the most common valve used in piping systems to throttle or regulate flow ?

   A. Globe valve
   B. Gate valve
   C. Butterfly valve
   D. Plug valve

   Submitted by: Faheem Zaman Dhaunroo

6. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?

   A. 9,000 kg
   B. 13,500 kg
   C. 18,000 kg
   D. 27,000 kg
   E. 30,000 kg

7. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_________________?

   A. minimum
   B. maximum
   C. zero
   D. negative value
   E. could be any value

8. Flow of water in a pipe about 3 metres in diameter can be measured by__________________?

   A. orifice plate
   B. venturi
   C. rotameter
   D. pitot tube
   E. nozzle

9. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________?

   A. head of water (h)
   B. h2
   C. V/T
   D. h2
   E. h3/1

10. A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?

    A. 900 minutes
    B. 4 minutes
    C. 4 x (225)3/2 minutes
    D. 4 (225)1/3 minutes
    E. 4 x V225 minutes