Heat Transfer MCQ Questions & Answers

61

Viscous & heat sensitive liquids are concentrated in __________ evaporators.

A) Open pan B) Long tube C) Agitated film D) None of these

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Answer & Solution

Answer: Option C

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62

Heat sensitive materials can be concentrated in an evaporator employing

A) Vacuum B) High pressure C) High residence time D) None of these

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Answer & Solution

Answer: Option A

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63

The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

A) α.T B) α.$$\frac{1}{{\text{T}}}$$ C) α.T⁴ D) Independent of T

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Answer & Solution

Answer: Option B

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64

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.

A) Equal to B) More than C) Less than D) Either more or less than (depending upon the fluid)

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Answer & Solution

Answer: Option A

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65

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are k_A and k_B and the specific heat capacities are C_PA and C_PB 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

A) C_PA > C_PB B) C_PA < C_PB C) k_A < 0.5 k_B D) k_A > 2 k_B

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Answer & Solution

Answer: Option C

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66

In which mode of heat transfer, the Biot number is important?

A) Transient heat conduction B) Natural convection C) Forced convection D) Radiation

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Answer & Solution

Answer: Option A

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67

When warm and cold liquids are mixed, the heat transfer is mainly by

A) Conduction B) Convection C) Radiation D) Both A & C

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Answer & Solution

Answer: Option B

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68

For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is

A) Forward B) Backward C) Parallel D) None of these

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Answer & Solution

Answer: Option B

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69

Pick out the wrong statement:

A) With change in temperature, the radiant energy emitted by a black body remains unchanged B) Absorptivity of a body approaches unity in case of diffuse reflection C) Absorptivity of a perfectly black body is unity D) Value of Stefan-Boltzman constant is 4.876 × 10^-8 kcal/m².hr.°K⁴

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Answer & Solution

Answer: Option A

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70

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

A) Finned tube heat exchanger with air inside and steam outside B) Finned tube heat exchanger with air outside and steam inside C) Shell and tube heat exchanger with air inside tubes and steam on shell side D) Shell and tube heat exchanger with air on shell side and steam inside tubes

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Answer & Solution

Answer: Option B

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Heat Transfer MCQ Questions & Answers | Chemical Engineering