A. 1 to 2
B. 4 to 10
C. 10 to 20
D. 20 to 30
Related Mcqs:
- Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?
A. 0.01 to 1
B. 1.5 to 2.5
C. 5 to 10
D. 10 to 20 - Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from ?
A. 1.5-2.5
B. 3.5-5.5
C. 7.5-10.0
D. 10-15 - Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of ______________ times the paddle diameter?
A. 0.1 to 0.25
B. 0.3 to 0.5
C. 0.5 to 0.6
D. 0.65 to 0.80 - In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?
A. Are easier to clean
B. Are less prone to fouling
C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
D. None of these - The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is_________________?
A. < 30
B. < 7
C. > 7 20 < 50 - For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?
A. d1/(d1 + d2)
B. d2/(d1 + d2)
C. (d1 + d2)/d1
D. (d1 + d2)/d2 - Height of the flights in the rotary drier is in the range of___________________?
A. 0.08 to 0.12 d
B. 0.02 to 0.05 d
C. 0.2 to 0.5 d
D. 0.5 to 0.6 d - Hold up of material in a operating rotary drier is in the range of___________________?
A. 0.05 to 0.15
B. 0.25 to 0.50
C. 0.5 to 0.8
D. 0.8 to 0.9 - Pressure differential maintained across a continuous rotary vacuum filter is in the range of _______________ mm Hg column?
A. 50 to 100
B. 100 to 150
C. 250 to 500
D. 600 to 700 - Slope of counter-current flow rotary drier is in the range of ____________ meter/metre?
A. 0 to 0.08
B. 0 to 0.8
C. 0 to 1.5
D. 0 to 2.2
