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Chemical Heat Transfer Quiz 6

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Chemical Heat Transfer Quiz 6

1 / 50

Pick out the wrong statement ?

2 / 50

Prandtl number is the ratio of_________?

3 / 50

Nusselt number is a function of Prandtl number and _______ number of fluid in natural convection heat transfer?

4 / 50

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5 / 50

Prandtl number for most of dry gases is about_________?

6 / 50

Open pan evaporators are preferred to be used, when the solution to be concentrated is__________?

7 / 50

Nusselt number is the ratio of the temperature gradient at the wall to__________?

8 / 50

Pick out the correct statement ?

9 / 50

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be__________?

10 / 50

Prandtl and Reynold?s analogies are identical for Prandtl number value of___________?

11 / 50

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called________?

12 / 50

Nusselt number is the ratio of the ______?

13 / 50

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about__________?

14 / 50

Pick out the correct equation ?

15 / 50

Multipass heat exchangers are used________?

16 / 50

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17 / 50

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then__________?

18 / 50

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19 / 50

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20 / 50

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?

21 / 50

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22 / 50

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23 / 50

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24 / 50

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25 / 50

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26 / 50

Natural convection is characterised by___________?

27 / 50

Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the______?

28 / 50

Out of the following four assumptions used in the derivation of the equation for LMTD [LMTD = (?t1 ? ?t2)/ln(?t1/?t2)], which one is subject to the largest deviation in practice ?

29 / 50

Peclet number (Pe) is given by______?

30 / 50

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31 / 50

Prandtl and Reynolds analogy are same, when Prandtl number is______?

32 / 50

Multiple effect evaporators ar used to_____?

33 / 50

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34 / 50

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35 / 50

Multiple effect evaporation is generally recommended, when the________?

36 / 50

Mechanical recompression evaporation is used in the production of______?

37 / 50

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is__________?

38 / 50

Pick out the wrong statement?

39 / 50

Multiple effect evaporation accounts for_____?

40 / 50

Prandtl number is given by___________?

41 / 50

Prandtl number is the ratio of_________?

42 / 50

Prandtl number is the reciprocal of______?

43 / 50

Nusselt number (for forced convection heat transfer) is a function of the ______ number?

44 / 50

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45 / 50

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46 / 50

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47 / 50

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48 / 50

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49 / 50

Planck?s distribution law is valid for ______ bodies?

50 / 50

Nucleate boiling is promoted _____?

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