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