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