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Mechanical Engineering Objective Questions { Heat Transfer }



43. Temperature of steam at around 540C can be measured by
A.Thermometer
B.Thermistor
C.Thermocouple
D.Thermopile

44. If the temperature of a solid surface changes form 27C to 627C, then its emissive power changes in the ratio of
A.3
B.81
C.9
D.27

45. Thermal conductivity of water at 20C is of the order of
A.0.1
B.0.23
C.0.42
D.0.51

46. Heat flows from one body to other when they have
A.Different heat contents
B.Different specific heat
C.Different atomic structure
D.Different temperatures

47. The concept of overall coefficient of heat transfer is used in heat transfer problems of
A.Conduction
B.Convection
C.Radiation
D.Conduction and convection

48. Total emissivity of polished silver compared to black body is
A.Same
B.Higher
C.More or less same
D.Very much lower

49. The amount of heat flow through a body by conduction is
A.Directly proportional to the surface area of the body
B.Dependent upon the material of the body
C.Inversely proportional to the thickness of the body
D.All of the above

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