Heat Transfer MCQ Questions & Answers

51

__________ paint has the maximum absorption coefficient.

A) Black B) Yellow C) White D) Grey

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Answer & Solution

Answer: Option A

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52

A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?

A) Yellow paint B) White paint C) Black paint D) Grey paint

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Answer & Solution

Answer: Option C

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53

The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities $${\varepsilon _{\text{x}}}$$ & $${\varepsilon _{\text{y}}}$$ is given by

A) $${\varepsilon _{\text{x}}} + {\varepsilon _{\text{y}}}$$ B) $${\varepsilon _{\text{x}}} \cdot {\varepsilon _{\text{y}}}$$ C) $$\frac{1}{{{\varepsilon _{\text{x}}}}} + \frac{1}{{{\varepsilon _{\text{y}}}}}$$ D) $$\frac{{{\varepsilon _{\text{x}}} + {\varepsilon _{\text{y}}}}}{{{\varepsilon _{\text{x}}} + {\varepsilon _{\text{y}}} - {\varepsilon _{\text{x}}} \cdot {\varepsilon _{\text{y}}}}}$$

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Answer & Solution

Answer: Option D

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54

Heat transfer co-efficient (h₁) for liquids increases with

A) Increasing temperature B) Decreasing temperature C) Decreasing Reynolds number D) None of these

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Answer & Solution

Answer: Option A

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55

Baffle spacing

A) Is not the same as baffle pitch B) Should be less than one fifth the diameter of the shell C) Should be less than the inside diameter of the shell D) None of these

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Answer & Solution

Answer: Option C

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56

In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

A) Nucleate B) Pool C) Low pressure D) None of these

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Answer & Solution

Answer: Option B

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57

The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.

A) Kirchoffs B) Planck's C) Wien's displacement D) Stefan-Boltzman

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Answer & Solution

Answer: Option A

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58

Solid angle subtended by the finite surface at the radiating element is

A) Called the view factor B) Called the angle of vision C) Proportional to the square of the distance between surfaces D) Expressed in terms of radians

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Answer & Solution

Answer: Option B

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59

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

A) Radiation B) Natural convection C) Forced convection D) Conduction

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Answer & Solution

Answer: Option C

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60

Agitated film evaporator is suitable for concentrating __________ liquids.

A) Foaming B) Viscous C) Very thin D) Corrosive

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Answer & Solution

Answer: Option B

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Heat Transfer MCQ Questions & Answers | Chemical Engineering