What is the steam economy in case of a single effect evaporator system ?
What is the steam economy in case of a single effect evaporator system ?
A. 1
B. > 1
C. < 1
D. 0.1
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The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?
The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?A. Heating volume
B. Heat transfer area
C. Nusselt number
D. None of these1 BTU/hr.ft.°F is equal to _____________ kcal/hr. m.°C?
1 BTU/hr.ft.°F is equal to _____________ kcal/hr. m.°C?A. 1.49
B. 1
C. 4.88
D. None of theseThe ratio of total radiating power to the absorptivity of the body depends upon the _____________ as per Kirchoff‟s law?
The ratio of total radiating power to the absorptivity of the body depends upon the _____________ as per Kirchoff‟s law?A. Wavelength of radiation
B. Nature of the body
C. Temperature of the body
D. None of theseSteam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?
Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?A. Vertical heat exchanger with steam on tube side
B. Vertical heat exchanger with steam on shell side
C. Horizontal heat exchanger with steam on tube side
D. Horizontal heat exchanger with steam on shell sideAir is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is________________?
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is________________?A. Finned tube heat exchanger with air inside and steam outside
B. Finned tube heat exchanger with air outside and steam inside
C. Shell and tube heat exchanger with air inside tubes and steam on shell side
D. Shell and tube heat exchanger with air on shell side and steam inside tubesA composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?A. CPA > CPB
B. CPA < CPB
C. kA < 0.5 kB
D. kA >2 kB