Chemical Heat Transfer Quiz 7
1 / 50
Steam trap is used to__________?
2 / 50
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the_________ ?
3 / 50
The film co-efficient between condensing vapour and metal wall increases with _______?
4 / 50
Rate of heat transfer by vaporisation from pools of water is affected by the ______?
5 / 50
Stefan?s block body radiation law can also be derived from _______ law?
6 / 50
Steam economy in case of a triple effect evaporator will be __________?
7 / 50
Steam side heat transfer co-efficient in an evaporator is in the range of _______ kcal/hr.m2?C?
8 / 50
Steam traps are provided in steam carrying pipelines to__________?
9 / 50
The equation, (NSt ? N2/3 Pr) = f/2, is the _____ analogy ?
10 / 50
The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) ?
11 / 50
Radiation heat losses from satisfactorily insulated high pressure boiler may be about ______ percent?
12 / 50
The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is__________?
13 / 50
Radiation energy is emitted by all the substances, which are above______?
14 / 50
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low_____?
15 / 50
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is_____?
16 / 50
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the__________?
17 / 50
The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe) ?
18 / 50
Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212?F may be around _______ BTU?
19 / 50
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?
20 / 50
The advantage of backward feed multiple effect evaporators over forward feed units is that_____?
21 / 50
The advantage of using a 1 ? 2 shell and tube heat exchanger over a 1 ? 1 shell and tube heat exchanger is__________?
22 / 50
Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
23 / 50
Terminal point temperature differences between fluids in case of a heat exchanger is termed as___________?
24 / 50
The driving potential for the crystal growth during crystallisation is the ________ of the solution?
25 / 50
The actual temperature drop across the heating surface in an evaporator depends on the__________?
26 / 50
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______?
27 / 50
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_________?
28 / 50
Presence of a non-condensing gas in a condensing vapour_____?
29 / 50
Steady state one dimensional heat flow by conduction as given by Fourier?s low does not assume that________?
30 / 50
The actual temperature drop across the heating surface of an evaporator depends on the________?
31 / 50
Stefan-Boltzmann law applies to ______ body?
32 / 50
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are________?
33 / 50
The film thickness for laminar film condensation on vertical surface ______ from top to bottom?
34 / 50
Steam is routed through the tube in case of a _______ evaporator?
35 / 50
Reynold?s analogy states that (where, St = Stanton number f = friction factor) ?
36 / 50
The equation, Nst = f/2, is the ______ analogy?
37 / 50
Small scale evaporation is done in a__________?
38 / 50
The critical radius ?r? of insulation on a pipe is given by______?
39 / 50
The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is _______ compared to the same size pipes without fins?
40 / 50
Resistance to heat flow by conduction is proportional to (where, t & ? are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?
41 / 50
The equivalent diameter for pressure drop is _________ that for heat transfer?
42 / 50
Solid angle subtended by the finite surface at the radiating element is__________?
43 / 50
Radiator of an automobile engine is a _______ type of heat exchanger?
44 / 50
Reason for operating an evaporator in multiple effects is to secure _____?
45 / 50
The equation, Nst = (f/2)/[1 + 5 (Npr ? 1) ?(f/2)], corresponds to _______ analogy?
46 / 50
Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in ?C T = absolute temperature in ? K) ?
47 / 50
The energy radiated from a surface Q at absolute temperature T is related as___________?
48 / 50
Removal of _______ heat is involved in the condensation of a vapor under saturated conditions?
49 / 50
Reynold?s analogy states that__________?
50 / 50
The absorptivity of a grey body at a given temperature ______ with increasing wavelength of radiation?
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