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.Management Sciences
Category: Process Equipment and Plant Design
Tube height in a calandria type evaporator is normally less than _______________ metres?
A. 1
B. 2
C. 3.5
D. 5.5
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator__________________?
A. Is economical in operation
B. Employs high velocity, high heat transfer rate and less heating surface requirement
C. Employs a centrifugal pump placed between external downtake from vapor drum and inlet to
tube bundle
D. Both B. & C.
A stuffing box is used for____________________?
A. Absorbing the contraction/expansion of pipeline due to temperature changes
B. Prevention of fluid leakage around moving parts
C. Facilitating smooth opening and closing of a valve
D. Reducing the resistance of fluid flow
Friction factor for turbulent flow in a new pipe is given by____________________?
A. f = 16/NRe
B. f = 0.04/(NRe)0.16
C. f = 0.22 NRe
0.5
D. f = 25/NRe
Speed of the drum of the rotary vacuum filter normally ranges from _____________ rpm?
A. 0.1 to 2
B. 5 to 7
C. 3 to 8
D. 8 to 15
Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?
A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
B. 4 : 1 to 8 : 1 for liquid-liquid exchanger
C. < 4 : 1 for gas-gas exchangers
D. Both B. & C.
The maximum liquid gradient over a tray must not exceed__________________?
A. 0.5″ -1.25″
B. 2″-3.5″
C. 5″
D. Half the tray spacing
In case of a continuous distillation column, increase in reflux ratio may result in the______________?
A. Lower fixed charges for the column
B. Greater cost for the reboiler heat supply
C. Greater cost for the condenser coolant
D. All A., B. and C.
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