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

Related Mcqs:

1. 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

2. 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

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

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

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

   A. steady
   B. unsteady
   C. uniform
   D. laminar
   E. free vortex type

5. Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?

   A. increases.
   B. decreases
   C. remains same
   D. unpredictable
   E. none of the above

6. A safety valve in a locomotive starts leaking. The leaking medium will be_________________?

   A. water
   B. dry steam
   C. wet steam
   D. super heated steam
   E. supersaturated steam

7. The feed check valve is used in order to ______________________?

   A. regulate flow of boiler water
   B. check level of water in boiler drum
   C. recirculate unwanted feed water
   D. allow high pressure feed water to flow to drum and not allow reverse flow to take place
   E. none of the above

8. When the flow parameters at any given instant remain same at every point, then flow is said to be___________________?

   A. quasi static
   B. steady state
   C. laminar
   D. uniform
   E. static

9. Two pipe systems can be said to be equivalent, when the following quantities are same__________________?

   A. friction loss and flow
   B. length and diameter
   C. flow and length
   D. friction factor and diameter
   E. velocity and diameter

10. Uniform flow occurs when ___________________?

    A. the flow is steady
    B. the flow is streamline
    C. size and shape of the cross section in a particular length remain constant
    D. size and cross section change uniformly along length
    E. flow occurs at constant fate