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