Chemical Heat Transfer Quiz 6

1 / 50

**Pick out the wrong statement?**

2 / 50

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

3 / 50

**Pick out the wrong statement?**

4 / 50

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

5 / 50

**Pick out the wrong statement/**

6 / 50

**Pick out the wrong statement ?**

7 / 50

**Multipass heat exchangers are used________?**

8 / 50

**Prandtl number is given by___________?**

9 / 50

**Planck?s distribution law is valid for ______ bodies?**

10 / 50

**Pick out the wrong statement ?**

11 / 50

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

12 / 50

**Mechanical recompression evaporation is used in the production of______?**

13 / 50

**Pick out the wrong statement ?**

14 / 50

**Pick out the wrong statement ?**

15 / 50

**Multiple effect evaporators ar used to_____?**

16 / 50

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

17 / 50

**Pick out the wrong statement?**

18 / 50

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

19 / 50

**Prandtl number is the ratio of_________?**

20 / 50

**Multiple effect evaporation accounts for_____?**

21 / 50

**Pick out the wrong statement ?**

22 / 50

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

23 / 50

**Nucleate boiling is promoted _____?**

24 / 50

**Pick out the correct statement ?**

25 / 50

**Pick out the wrong statement?**

26 / 50

**Pick out the wrong statement ?**

27 / 50

**Prandtl number for most of dry gases is about_________?**

28 / 50

**Pick out the wrong statement ?**

29 / 50

**Pick out the wrong statement ?**

30 / 50

**Pick out the wrong statement?**

31 / 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 ?**

32 / 50

**Pick out the wrong statement?**

33 / 50

**Pick out the wrong statement?**

34 / 50

**Pick out the wrong statement ?**

35 / 50

**Prandtl number is the reciprocal of______?**

36 / 50

**Multiple effect evaporation is generally recommended, when the________?**

37 / 50

**Pick out the correct statement ?**

38 / 50

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

39 / 50

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

40 / 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__________?**

41 / 50

**Pick out the wrong statement ?**

42 / 50

**Prandtl number is the ratio of_________?**

43 / 50

**Peclet number (Pe) is given by______?**

44 / 50

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

45 / 50

**Natural convection is characterised by___________?**

46 / 50

**Nusselt number is the ratio of the ______?**

47 / 50

**Pick out the correct equation ?**

48 / 50

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

49 / 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__________?**

50 / 50

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

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