Chemical Heat Transfer Quiz 2

1 / 50

**Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is_________?**

2 / 50

**At constant temperature, the thermal conductivities of gases ______ with rise in pressure?**

3 / 50

**Crystallisation of solids from a homogeneous solution is a/an _______ process?**

4 / 50

**Dropwise condensation is promoted on a/an _______ surface?**

5 / 50

**Baffles are provided in heat exchangers to_____?**

6 / 50

**Boiling of milk in an open vessel is an example of _______ boiling?**

7 / 50

**Duhring?s rule is important in solving problems on___________?**

8 / 50

**Economy of a multiple effect evaporator depends upon the _______?**

9 / 50

**Colburn analogy is applicable for the value of Prandtl number from__________?**

10 / 50

**Boiling point elevation of a solution of NaOH _______?**

11 / 50

**Electromagnetic radiations propagate in vacuum with a velocity of ________ metre/second?**

12 / 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_________?**

13 / 50

**Correction is applied to LMTD for __________ flow?**

14 / 50

**Evaporation by thermo compression results in the ___________?**

15 / 50

**Cp?/K is termed as the _______ number?**

16 / 50

**Evaporation of 1kg of water from a solution in a single effect evaporator requires about _________ kg of steam?**

17 / 50

**Economy of a multiple effect evaporator is not influenced much by the_________?**

18 / 50

**Electro-magnetic spectrum range, which is important for radiation varies from ______ microns?**

19 / 50

**Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?**

20 / 50

**Convective heat transfer, in which heat is transferred by movement of warmed matter is described by_____?**

21 / 50

**During crystallisation, formation of crystal can occur in _______ solution only?**

22 / 50

**Evaporator tubes are generally_______?**

23 / 50

**Black liquor generated during paper manufacture is concentrated in a_____?**

24 / 50

**At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?**

25 / 50

**At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the_____?**

26 / 50

**Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ______?**

27 / 50

**Circulation pump is located below the evaporator to_____?**

28 / 50

**Baffles are provided in heat exchangers to increase the_________?**

29 / 50

**As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?**

30 / 50

**Crystal size in a continuous crystalliser depends upon the_____?**

31 / 50

**Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is ___________?**

32 / 50

**Critical value of the ______ number governs the transition from laminar to turbulent flow in free convection heat transfer?**

33 / 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?**

34 / 50

**Choose the correct equation ?**

35 / 50

**Double pipe heat exchangers are used___________?**

36 / 50

**Conductance is given by (where, x = thickness, A = heat flow area, K = thermal conductivity.)?**

37 / 50

**Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube_____?**

38 / 50

**Double pipe heat exchangers are preferably useful, when______?**

39 / 50

**Baffles in the shell side of a shell and tube heat exchanger ?**

40 / 50

**Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_______?**

41 / 50

**Economy of an evaporator is influenced by the_______?**

42 / 50

**Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid _____?**

43 / 50

**Dropwise condensation occurs on _______ surfaces?**

44 / 50

**Baffle spacing ______?**

45 / 50

**Boiling point of a solution according to Duhring?s rule is a linear function of the ______ of water?**

46 / 50

**Corrosiveness of steam condensate is due to the presence of_________?**

47 / 50

**As per Kirchoff?s law, the ratio of the total radiating power to the absorptivity of a body depends on the________?**

48 / 50

**Controlling heat transfer film co-efficient is the one, which offers _______ resistance to heat transfer?**

49 / 50

**Boiling point elevation of an ideal solution________?**

50 / 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?**

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