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

**Pick out the wrong statement?**

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

**Pick out the wrong statement ?**

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

**Pick out the wrong statement?**

19 / 50

**Pick out the wrong statement ?**

20 / 50

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

21 / 50

**Pick out the wrong statement ?**

22 / 50

**Pick out the wrong statement ?**

23 / 50

**Pick out the correct statement ?**

24 / 50

**Pick out the wrong statement ?**

25 / 50

**Pick out the wrong statement?**

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

**Pick out the wrong statement ?**

31 / 50

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

32 / 50

**Multiple effect evaporators ar used to_____?**

33 / 50

**Pick out the wrong statement?**

34 / 50

**Pick out the wrong statement?**

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

**Pick out the wrong statement ?**

45 / 50

**Pick out the wrong statement/**

46 / 50

**Pick out the wrong statement?**

47 / 50

**Pick out the wrong statement ?**

48 / 50

**Pick out the wrong statement ?**

49 / 50

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

50 / 50

**Nucleate boiling is promoted _____?**

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