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