Which of the following has maximum thermal conductivity ?
Which of the following has maximum thermal conductivity ?
A. Iron
B. Coal
C. Nitrogen
D. Tar
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In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?A. Infinity
B. Zero
C. Same as average heat transfer co-efficient for tube side
D. None of theseFourier’s law applies to the heat transfer by__________________?
Fourier’s law applies to the heat transfer by__________________?A. Convection
B. Radiation
C. Conduction
D. All A., B. & C.Baffle spacing ____________________?
Baffle spacing ____________________?A. Is not the same as baffle pitch
B. Should be less than one fifth the diameter of the shell
C. Should be less than the inside diameter of the shell
D. None of thesejH factor for heat transfer is not a function of the _______________ number?
jH factor for heat transfer is not a function of the _______________ number?A. Reynolds
B. Nusselt
C. Grashoff
D. Both B. & C.200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?
200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?A. 0.5
B. 0.05
C. 0.1
D. 0.15Radiation heat losses from satisfactorily insulated high pressure boiler may be about _____________ percent?
Radiation heat losses from satisfactorily insulated high pressure boiler may be about _____________ percent?A. 1
B. 7
C. 18
D. 26