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.Management Sciences
Category: Chemical Heat Transfer
Kirchoff’s law is applicable to________________?
0
A. Monochromatic radiation only
B. Total radiation only
C. Both A. and B.
D. Only volumes and not to surfaces
It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?
A. > 0.75
B. < 0.75
C. < 0.50
D. < 0.25
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?
A. Bleed point
B. Vent
C. Catchall
D. Baffle
Double pipe heat exchangers are used__________________?
A. When heat transfer area required is very high
B. When heat transfer area required is very low, i.e. (100-200 ft2).
C. Because it occupies less floor area
D. Because it is less costly
Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?
A. Conduction
B. Natural convection
C. Forced convection
D. None of these
Intermittent tube cleaning is possible to be done in case of a _____________ evaporator?
A. Basket type
B. Horizontal tube
C. Calandria
D. None of these
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to________________?
A. Heat the water from 0°C to 100°C
B. Evaporate the water
C. To superheat the steam
D. Data insufficient, can’t be predicted
Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on_____________?
A. T1 – T2
B. T1 – Ta
C. T2 – Ta
D. None of these
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?
A. 0.5
B. < 0.5
C. > 0.6
D. < 0.1
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