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Chemical Heat Transfer Quiz 5

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Chemical Heat Transfer Quiz 5

1 / 50

LMTD can?t be used as such without a correction factor for the__________?

2 / 50

In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid ________?

3 / 50

In Fourier?s law, the proportionality constant is called the________?

4 / 50

In SI units, thermal conductivity is expressed in___________?

5 / 50

In case of surface condensers, a straight line is obtained on plotting 1/U vs. _____ on an ordinary graph paper?

6 / 50

In pipe flow, heat is transferred from hot wall to the liquid by___________?

7 / 50

Kg of liquid evaporated per hour in an evaporator is defined as its__________?

8 / 50

In counter flow compared to parallel flow, ?

9 / 50

In forced convection, the Nusselt number is a function of ______?

10 / 50

Maximum heat transfer rate is achieved in ______ flow?

11 / 50

Increasing the liquor level in the evaporator results in the________?

12 / 50

In sub-cooled boiling ?

13 / 50

Loss of heat from untagged steam pipe to the ambient air is by ___________?

14 / 50

Maximum heat transfer rate can be expected in case of_________?

15 / 50

In forced circulation, the heating element is injected__________?

16 / 50

In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient_______?

17 / 50

Low thermal conductivity of heat insulating materials is due to its________?

18 / 50

jH factor for heat transfer is not a function of the ________ number?

19 / 50

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is_____?

20 / 50

Log mean temperature difference (LMTD) cannot be used, if _____?

21 / 50

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is ______ the outlet temperature of the cold fluid?

22 / 50

In case of evaporators, liquid entrainment results primarily due to__________?

23 / 50

jH factor for heat transfer depends upon the _____ number?

24 / 50

In case of heat transfer by conduction in a hollow cylinder, _______ mean area is used to calculate the heat transfer rate?

25 / 50

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because__________?

26 / 50

Latent heat absorbed by 1 lb of water at 212?F, when it is changed to steam at 212?F, may be around _______ BTU?

27 / 50

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is _________?

28 / 50

Kirchoff?s law is applicable to_________?

29 / 50

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred__________?

30 / 50

Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around ______ metres/second?

31 / 50

In the equation Q = UA?t; ?t is___________?

32 / 50

Maximum heat transfer rate is obtained in _______ flow?

33 / 50

In SI units, fouling factor is expressed in ___________?

34 / 50

Kirchoff?s law applies to ______ radiation?

35 / 50

Leidenfrost point is a term concerned with the______?

36 / 50

In evaporators, lowering the feed temperature________?

37 / 50

In natural convection heat transfer, the correlating parameter is the_________?

38 / 50

Low thermal conductivity of heat insulating materials is due to its__________?

39 / 50

In case of a vertical tube evaporator, with increase in the liquor level, the_____?

40 / 50

LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the _______ flow?

41 / 50

In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell) ?

42 / 50

It is not preferable to use superheated steam in evaporators, because of its very__________?

43 / 50

In which mode of heat transfer, the Biot number is important ?

44 / 50

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is__________?

45 / 50

In case of a vertical tube evaporator, with increase in the liquor level, the _____ is increased?

46 / 50

Intermittent tube cleaning is possible to be done in case of a ______ evaporator?

47 / 50

In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side _______ the heat transfer rate?

48 / 50

LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is ___________?

49 / 50

LMTD for counter-flow and parallel flow heat exchanger will be the same, when the__________?

50 / 50

In the free convection regime of pool boiling, the heat flux is proportional to___________?

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