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