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.Management Sciences
Category: Chemical Heat Transfer
In a multiple effect evaporator, the effect of boiling point elevation is to______________________?
A. Reduce the capacity
B. Reduce the economy
C. Increase the economy
D. None of these
In a shell and tube heat exchanger, the shell side fluid velocity can‟t be changed by changing the_________________?
A. Tube layout
B. Tube diameter
C. Tube pitch
D. Number of baffles
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid_________________?
A. Remains unchanged
B. Increases
C. Increases or decreases depending on number of shell passes
D. Decreases
Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called_______________?
A. Radiation
B. Natural convection
C. Forced convection
D. Conduction
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low___________________?
A. Hardness
B. Dissolved solids content
C. Suspended solids content
D. All A., B. and C.
In case of evaporators, liquid entrainment results primarily due to_________________?
A. High vacuum in the evaporator
B. High evaporation rate
C. Foaming of the solution
D. High heat transfer rate
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the_________________?
A. Baffle spacing & shell diameter
B. Tube diameter & pitch
C. Viscosity, density & mass velocity of shell side fluid
D. None of these
Heat transfer co-efficient (h1) for liquids increases with__________________?
A. Increasing temperature
B. Decreasing temperature
C. Decreasing Reynolds number
D. None of these
Which of the following situations can be approximated to a steady state heat transfer system ?
A. A red hot steel slab (having outside surface temperature as 1300°C) exposed to the
atmospheric air at 35°C
B. 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe
exposed to atmospheric air at 35°C
C. Boiling brine kept in open vessel when the bottom surface temperature of the vessel is
maintained constant at 180°C
D. A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper
pipe exposed to atmospheric air at 35°C
Electro-magnetic spectrum range, which is important for radiation varies from _____________ microns?
A. 1 to 100
B. 0.5 to 50
C. 10 to 100
D. 100 to 1000
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