Chemical Heat Transfer Quiz 2
1 / 50
As per Kirchoff?s law, the ratio of the total radiating power to the absorptivity of a body depends on the________?
2 / 50
Crystal size in a continuous crystalliser depends upon the_____?
3 / 50
Boiling point elevation of a solution of NaOH _______?
4 / 50
At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the_____?
5 / 50
Double pipe heat exchangers are used___________?
6 / 50
At constant temperature, the thermal conductivities of gases ______ with rise in pressure?
7 / 50
Convective heat transfer, in which heat is transferred by movement of warmed matter is described by_____?
8 / 50
Electro-magnetic spectrum range, which is important for radiation varies from ______ microns?
9 / 50
Conductance is given by (where, x = thickness, A = heat flow area, K = thermal conductivity.)?
10 / 50
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
11 / 50
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the_________?
12 / 50
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube_____?
13 / 50
Boiling of milk in an open vessel is an example of _______ boiling?
14 / 50
Evaporation by thermo compression results in the ___________?
15 / 50
Choose the correct equation ?
16 / 50
Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid _____?
17 / 50
Economy of a multiple effect evaporator is not influenced much by the_________?
18 / 50
Boiling point of a solution according to Duhring?s rule is a linear function of the ______ of water?
19 / 50
Cp?/K is termed as the _______ number?
20 / 50
Controlling heat transfer film co-efficient is the one, which offers _______ resistance to heat transfer?
21 / 50
Corrosiveness of steam condensate is due to the presence of_________?
22 / 50
Correction is applied to LMTD for __________ flow?
23 / 50
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the ______ zone?
24 / 50
Economy of an evaporator is influenced by the_______?
25 / 50
Baffles in the shell side of a shell and tube heat exchanger ?
26 / 50
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?
27 / 50
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is ___________?
28 / 50
Baffles are provided in heat exchangers to_____?
29 / 50
Baffle spacing ______?
30 / 50
Baffles are provided in heat exchangers to increase the_________?
31 / 50
Black liquor generated during paper manufacture is concentrated in a_____?
32 / 50
Circulation pump is located below the evaporator to_____?
33 / 50
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?
34 / 50
Evaporator tubes are generally_______?
35 / 50
Evaporation of 1kg of water from a solution in a single effect evaporator requires about _________ kg of steam?
36 / 50
During crystallisation, formation of crystal can occur in _______ solution only?
37 / 50
Electromagnetic radiations propagate in vacuum with a velocity of ________ metre/second?
38 / 50
Dropwise condensation is promoted on a/an _______ surface?
39 / 50
Critical value of the ______ number governs the transition from laminar to turbulent flow in free convection heat transfer?
40 / 50
Duhring?s rule is important in solving problems on___________?
41 / 50
Colburn analogy is applicable for the value of Prandtl number from__________?
42 / 50
Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ______?
43 / 50
Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_______?
44 / 50
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is_________?
45 / 50
Boiling point elevation for a strong and concentrated solution is found by Duhring?s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the ________ of pure water?
46 / 50
Boiling point elevation of an ideal solution________?
47 / 50
Dropwise condensation occurs on _______ surfaces?
48 / 50
Economy of a multiple effect evaporator depends upon the _______?
49 / 50
Double pipe heat exchangers are preferably useful, when______?
50 / 50
Crystallisation of solids from a homogeneous solution is a/an _______ process?
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