The units of resistance to heat transfer is _____________________?
The units of resistance to heat transfer is _____________________?
A. J.m-2.K-1
B. J.m-1.K-1
C. W.m-2.K-1
D. W-1m2K
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Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeping_________________?
Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeg_________________?A. Both the tube sheets fixed
B. Both the tube sheets floating
C. The top tube sheet floating and bottom tube sheet fixed
D. The top tube sheet fixed and the bottom tube-sheet floatingWhich of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?A. Bleed point
B. Vent
C. Catchall
D. BaffleThe Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?
The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?A. Low Reynold’s number
B. Very low Grashoff number
C. Molten metals
D. All A., B. and C.Economy of a multiple effect evaporator is not influenced much by the_______________________?
Economy of a multiple effect evaporator is not influenced much by the_______________________?A. Boiling point elevations
B. Temperature of the feed
C. Rate of heat transfer
D. Ratio of the weight of the thin liquor to thick liquorResistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?
Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?A. t
B. 1/ρ
C. 1/A
D. All A., B. & C.With increase in temperature, the thermal conductivity of steel___________________?
With increase in temperature, the thermal conductivity of steel___________________?A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentially