Chemical Heat Transfer Quiz 5
1 / 50
In Fourier?s law, the proportionality constant is called the________?
2 / 50
jH factor for heat transfer depends upon the _____ number?
3 / 50
Maximum heat transfer rate can be expected in case of_________?
4 / 50
Low thermal conductivity of heat insulating materials is due to its________?
5 / 50
In pipe flow, heat is transferred from hot wall to the liquid by___________?
6 / 50
Increasing the liquor level in the evaporator results in the________?
7 / 50
In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is ______ the outlet temperature of the cold fluid?
8 / 50
In SI units, thermal conductivity is expressed in___________?
9 / 50
LMTD for counter-flow and parallel flow heat exchanger will be the same, when the__________?
10 / 50
In forced circulation, the heating element is injected__________?
11 / 50
Leidenfrost point is a term concerned with the______?
12 / 50
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is ___________?
13 / 50
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is__________?
14 / 50
In natural convection heat transfer, the correlating parameter is the_________?
15 / 50
Latent heat absorbed by 1 lb of water at 212?F, when it is changed to steam at 212?F, may be around _______ BTU?
16 / 50
It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is_____?
17 / 50
Maximum heat transfer rate is achieved in ______ flow?
18 / 50
Loss of heat from untagged steam pipe to the ambient air is by ___________?
19 / 50
In the free convection regime of pool boiling, the heat flux is proportional to___________?
20 / 50
Kirchoff?s law is applicable to_________?
21 / 50
In SI units, fouling factor is expressed in ___________?
22 / 50
In case of surface condensers, a straight line is obtained on plotting 1/U vs. _____ on an ordinary graph paper?
23 / 50
In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell) ?
24 / 50
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around ______ metres/second?
25 / 50
LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the _______ flow?
26 / 50
In case of a vertical tube evaporator, with increase in the liquor level, the_____?
27 / 50
Kirchoff?s law applies to ______ radiation?
28 / 50
In which mode of heat transfer, the Biot number is important ?
29 / 50
Log mean temperature difference (LMTD) cannot be used, if _____?
30 / 50
jH factor for heat transfer is not a function of the ________ number?
31 / 50
In evaporators, lowering the feed temperature________?
32 / 50
Maximum heat transfer rate is obtained in _______ flow?
33 / 50
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient_______?
34 / 50
In forced convection, the Nusselt number is a function of ______?
35 / 50
In case of a vertical tube evaporator, with increase in the liquor level, the _____ is increased?
36 / 50
In case of evaporators, liquid entrainment results primarily due to__________?
37 / 50
In sub-cooled boiling ?
38 / 50
Intermittent tube cleaning is possible to be done in case of a ______ evaporator?
39 / 50
Low thermal conductivity of heat insulating materials is due to its__________?
40 / 50
In counter flow compared to parallel flow, ?
41 / 50
In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side _______ the heat transfer rate?
42 / 50
In case of heat transfer by conduction in a hollow cylinder, _______ mean area is used to calculate the heat transfer rate?
43 / 50
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because__________?
44 / 50
LMTD can?t be used as such without a correction factor for the__________?
45 / 50
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred__________?
46 / 50
Kg of liquid evaporated per hour in an evaporator is defined as its__________?
47 / 50
In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is _________?
48 / 50
It is not preferable to use superheated steam in evaporators, because of its very__________?
49 / 50
In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid ________?
50 / 50
In the equation Q = UA?t; ?t is___________?
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