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.Management Sciences
Category: Chemical Heat Transfer
In a heat exchanger, floating head is provided to____________________?
A. Facilitate cleaning of the exchanger
B. Increase the heat transfer area
C. Relieve stresses caused by thermal expansion
D. Increase log mean temperature gradient
Baffles are provided in heat exchangers to increase the________________?
A. Fouling factor
B. Heat transfer area
C. Heat transfer co-efficient
D. Heat transfer rate
Mechanical recompression evaporation is used in the production of____________________?
A. Alcohol
B. Distilled water
C. Salt
D. Fruits jam
For an ideal black body______________________?
A. Absorptivity = 1
B. Reflectivity = 1
C. Emissivity = 0
D. Transmissivity = 1
Water is normally used as a coolant in the heat exchange equipments mainly because of its___________________?
A. Abundance & high heat capacity
B. Low density
C. Low viscosity
D. High fluidity
The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?
A. Steam ejector
B. Entrainment separator
C. Compressor
D. Vacuum pump
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred_________________?
A. Through a metallic wall
B. By direct contact of hot flue gas with air
C. By heating an intermediate material (like chequor bricks) and then heating the air from this
hot material
D. None of these
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