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.Management Sciences
Category: CHEMICAL ENGINEERING
The minimum number of theoretical plates is required for achieving a given separation in distillation column with_________________?
0
A. No reflux
B. Total reflux
C. Zero reflux ratio
D. Minimum reflux ratio
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________?
A. Magnetic flowmeter
B. Pitot tube
C. Flow nozzle type flowmeter
D. Turbine flowmeter
The thermal stress in a metallic bar does not depend upon the_____________________?
A. Changes in temperature
B. Cross-sectional area
C. Both A. and B.
D. Neither A. nor B.
Name the safety device used to protect the boiler, when the water level falls below a minimum level ?
A. Blow down valve
B. Blow off cock
C. Fusible plug
D. Safety valve
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?
A. Load
B. Controlled
C. Manipulated
D. None of these
The force due to wind load acting on a tall vessel depends upon its___________________?
A. Shape
B. Outside diameter
C. Height
D. All A, B. & C.
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?
A. 35.5
B. 43.75
C. 81.25
D. 48.25
The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?
A. 20
B. 230
C. 750
D. 1500
The diameter of a propeller agitator used in agitation tank ranges from ____________ percent of the tank diameter and its peripheral speed is normally 300 to 500 metres/minute ?
A. 5 to 10
B. 15 to 30
C. 40 to 50
D. 55 to 75
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