Brass valves are usually made for pipe sizes ______________ inches?

Related Mcqs:

1. For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?

   A. Di, opt = 3.9 Q0.45 ρ0.13
   B. Di, opt = 3.9 Q0.45. μ0.95
   C. Di, opt = 4.7 Q0.36. μ3.2ρ0.13
   D. Di, opt = 3 Q0.36. μ0.88

2. In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?

   A. 0.5 to 1.5
   B. 2.5 to 4.0
   C. 5 to 10
   D. 10 to 15

3. For pipe flows, head is proportional to ______________ at constant capacity (where D = pipe diameter) ?

   A. 1/D
   B. 1/D2
   C. 1/D5
   D. D2

4. Frame thickness in the plate and frame filter press is normally in the range of ______________ inches?

   A. 0.25 to 4
   B. 0.25 to 8
   C. 1 to 5
   D. 1 to 12

5. (Le/D) for fully open gate valves would be __________________?

   A. Much more than that for fully open globe valves
   B. Much less (say 2% than that for fully open globe valves)
   C. Around 7
   D. Both B. and C.

6. Needle valves are generally not used for___________________?

   A. Very large diameter pipes
   B. High pressure throttling service
   C. Very accurate flow control
   D. Smaller sizes of pipe

7. Safety valves are provided in chemical equipments to guard against excessive_________________?

   A. Temperature
   B. Pressure/pressure fluctuation
   C. Turbulence
   D. Noise

8. Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is ___________________?

   A. More
   B. Less
   C. Same
   D. Either A. or B.; depends upon the I.D. of the pipe

9. For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________?

   A. Di, opt = 3 Q0.36 ρ0.18
   B. Di, opt = 3.9 Q0.45 ρ0.23
   C. Di, opt = 7.6 Q0.36 ρ0.9
   D. Di, opt = 3 Q0.36 ρ1.86 μ0.08

10. Normal screwed fittings are used for pipes upto a diameter of _______________ inches?

    A. 1.5
    B. 3
    C. 5
    D. 9