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Chemical Heat Transfer Quiz 1

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Chemical Heat Transfer Quiz 1

1 / 50

A ______ evaporator employs an annular downtake?

2 / 50

A hot body will radiate heat most rapidly, if its surface is_____?

3 / 50

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor) ?

4 / 50

200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 ? 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?

5 / 50

Analogy between mass and heat transfer is not applicable in case of______?

6 / 50

A ______ surface has the maximum thermal emissivity out of the following ?

7 / 50

A 2-4 heat exchanger involves___________?

8 / 50

______ heat exchanger is used for chilling oil to be dewaxed?

9 / 50

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when__________?

10 / 50

A multiple effect evaporator as compared to a single effect evaporator of the same capacity has __________?

11 / 50

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is_________?

12 / 50

Air is best heated with steam in a heat exchanger of___________?

13 / 50

A black body when hot, emits heat radiation of ______ wavelengths?

14 / 50

A body cools down from 75?C to 70?C in 10 minutes. It will cool down from 70? C to 65? C in _______ minutes?

15 / 50

_____ chart is known as transient heat conduction chart?

16 / 50

A graph between ______ is called Wilson plot?

17 / 50

A long iron rod initially at a temperature of 20?C has one end dipped in boiling water (100?C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40?C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time _____?

18 / 50

A dephlegmator is a_______?

19 / 50

Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?

20 / 50

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is _______?

21 / 50

A diathermanous substance ________ the thermal radiation completely?

22 / 50

A black body does not _____ radiation?

23 / 50

?Fouling factor? used in the design of a multipass shell and tube heat exchanger is a_______?

24 / 50

1 BTU/hr.ft.?F is equal to ______ kcal/hr. m.?C?

25 / 50

A steel sphere of radius 0.1 m at 400?K is immersed in an oil at 300?K. If the centre of the sphere reaches 350?K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions? Assume that the conductive heat transfer co-efficient is infinitely large ?

26 / 50

A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is___________?

27 / 50

A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case ?

28 / 50

A BTU/hr.ft.2 ?F is equal to__________?

29 / 50

Absorptivity and reflectivity of a perfect black body are respectively ________?

30 / 50

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because___________?

31 / 50

Among liquids, water has a comparatively high value of thermal conductivity, due to its___________?

32 / 50

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a__________?

33 / 50

An ejector is used to___________?

34 / 50

A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95?C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 ? 1 shell and tube heat exchanger is available. The best arrangement is________?

35 / 50

All analogy equations connecting friction factor and heat transfer co-efficient apply only to _____?

36 / 50

A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ?d?. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_______?

37 / 50

1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is___________?

38 / 50

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides ___________?

39 / 50

?The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium?. This is _______ law?

40 / 50

A perfect black body is a perfect ______ of radiation?

41 / 50

A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of___________?

42 / 50

______ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?

43 / 50

?Duhring?s plot? is of use in__________?

44 / 50

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the ________ number?

45 / 50

A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun ?

46 / 50

________ paint has the maximum absorption coefficient ?

47 / 50

______ paint has the minimum absorption co-efficient?

48 / 50

An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is_____?

49 / 50

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an_____?

50 / 50

A body is called grey if the monochromatic emissivity of the body is_____?

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