A black body when hot, emits heat radiation of _____________ wavelengths?
A black body when hot, emits heat radiation of _____________ wavelengths?
A. Small
B. Large
C. All
D. One fixed
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A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?A. 6000
B. 24000
C. 60000
D. 48000Which of the following situations can be approximated to a steady state heat transfer system ?
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°CLog mean temperature difference (LMTD) cannot be used, if ___________________?
Log mean temperature difference (LMTD) cannot be used, if ___________________?A. Heat transfer co-efficient over the entire heat exchanger is not constant
B. There exists an unsteady state
C. The heat capacity is not constant and there is a phase change
D. None of theseThermal conductivity of a conducting solid material depends upon its_______________?
Thermal conductivity of a conducting solid material depends upon its_______________?A. Temperature
B. Porosity
C. Both A. & B.
D. Neither A. nor B.Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?A. Square pitch
B. Triangular pitch
C. Diagonal square pitch
D. None of theseThe maximum heat transfer co-efficient from steam heating will be attained when the steam is_________________?
The maximum heat transfer co-efficient from steam heating will be attained when the steam is_________________?A. Supersaturated
B. Saturated
C. Wet
D. None of these