Heat flux is the time rate of heat transfer per unit_______________?
Heat flux is the time rate of heat transfer per unit_______________?
A. Length
B. Area
C. Volume
D. None of these
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In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?A. In low range of temperature differences
B. In high range of temperature differences
C. Because of its low cost
D. To prevent corrosion of the tube bundlesVacuum is generally maintained in the vapour space of an evaporator mainly to__________________?
Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?A. Get economical temperature difference by using moderate pressure steam
B. Facilitate forward feeding in multiple effect evaporation
C. Concentrate heat sensitive materials
D. Achieve very high concentration of the final productMaximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?A. 1
B. 10
C. 20
D. 30_______________ paint has the maximum absorption coefficient ?
_______________ paint has the maximum absorption coefficient ?A. Black
B. Yellow
C. White
D. GreyThe rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?
The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?A. (ΔT)1/4
B. (ΔT)1/2
C. (ΔT)5/4
D. (ΔT)3/4Maximum heat transfer rate is obtained in ______________ flow?
Maximum heat transfer rate is obtained in ______________ flow?A. Laminar
B. Turbulent
C. Creeg
D. Transition region