16. A copper block and an air mass block having similar dimensions are subjected to symmetrical heat transfer from one face of each block. The other face of the block will be reaching the same temperature at a rate –
A. faster in the air block
B. faster in a copper block
C. equal in copper as well as in air block
D. Data inadequate
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17. In a shell and tube heat exchanger, baffles are provided on the shell side?
A. to provide support for tubes
B. to improve heat transfer
C. to prevent stagnation of shell-side fluid
D. All the above
18. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means is called –
A. conduction
B. radiation
C. free convection
D. forced convection
19. Kirchhoff’s law states that –
A. the ratio of the emissive power and absorptive power of all bodies is the same and equal to the emissive power of a perfectly black body
B. the wavelength corresponding to the maximum energy is proportional to the absolute temperature
C. the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
D. None of these
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20. The ratio of surface convection resistance to the internal conduction resistance is known as –
A. Biot number
B. Prandtl number
C. Stanton number
D. Grashoff number