The normal range of velocity of steam in pipes is _________________________ m/sec?

Related Mcqs:

1. The normal range of velocity of water in pipes is _______________ m/sec?

   A. 0.1-0.5
   B. 1-2
   C. 10-50
   D. 15-30

2. 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

3. A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?

   A. 45
   B. 60
   C. 80
   D. 95

4. Vapor velocity in a distillation column for non-foaming mixture is in the range of ______________ times the flooding velocity?

   A. 0.1 to 0.3
   B. 0.6 to 0.7
   C. 0.85 to 0.95
   D. 1.5 to 2

5. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effects in evaporation ?

   A. Increases capacity
   B. Increases economy
   C. Does not affect the capacity
   D. Both B. & C.

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

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

7. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about _________________ mm of water column per metre height of packing?

   A. 1-5
   B. 20-40
   C. 100-150
   D. 1000-1500

8. Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as_________________?

   A. Δp = G
   B. Δp = G0.5
   C. Δp = G2
   D. Δp = 1/G0.6

9. Flanges are connected to pipes by _______________________?

   A. Screwing
   B. Welding
   C. Brazing
   D. All A., B. and C.

10. An under-designed steam trap will___________________?

    A. Waste steam
    B. Destroy itself of acceleration wear due to rapid recycling
    C. Back up condensate and cause water hammer in steam line
    D. None of these