Engineering :: Heat Transfer
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1. |
Transmission of heat by molecular collision is |
A. |
Conduction |
B. |
Convection |
C. |
Radiation |
D. |
Scattering |
E. |
Transmission |
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Answer: Option B
Explanation:
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2. |
Metals are good conductors of heat because |
A. |
They contain free electrons |
B. |
Their atoms are relatively far apart |
C. |
Their atoms collide frequently |
D. |
They have reflecting surfaces |
E. |
None of the above |
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Answer: Option A
Explanation:
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3. |
Heat is shown to be closely related to |
A. |
A fluid |
B. |
Energy |
C. |
Momentum |
D. |
Temperature |
E. |
Waveform |
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Answer: Option D
Explanation:
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4. |
Body A is kept in contact with body B. Heat will flow from A to B, if |
A. |
The heat content of A is greater than that of B |
B. |
The temperature of A is greter than that of B |
C. |
The specific heat of A is greater than that of B |
D. |
The specific heat of A is lower than that of B |
E. |
None of the above |
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Answer: Option B
Explanation:
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5. |
Cork is a good insulator because |
A. |
Its density is low |
B. |
It is porous |
C. |
It can be powdered |
D. |
It can be cast into rolls |
E. |
It is flexible |
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Answer: Option B
Explanation:
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6. |
Which one of the following cannot be unit of thermal conductivity? |
A. |
Watt / m2 K |
B. |
Kcal/m-hr?C |
C. |
BTU/ft-h?F |
D. |
cal/c,-sec?K |
E. |
CHU/ft-hr?C |
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Answer: Option A
Explanation:
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7. |
Which one of the following will have least value of thermal conductivity? |
Answer: Option E
Explanation:
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8. |
Which one of the following materials will have highest value of thermal conductivity? |
Answer: Option D
Explanation:
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9. |
Heat conduction does not occur |
A. |
If a physical body is impermeable to any kind of rays |
B. |
If the parts of a body are not in motion relative to one another |
C. |
If the bodies are kept in vacuum |
D. |
If the bodies are immersed in water |
E. |
If the temperature difference between the bodies does not exist |
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Answer: Option E
Explanation:
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10. |
Unsteady state of heat flow occurs in |
A. |
Flow of heat through furnace walls |
B. |
Flow of heat through insulated pipe with constant surface temperature |
C. |
Annealing of castings |
D. |
Flow of heat through refrigerator walls |
E. |
None of the above |
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Answer: Option C
Explanation:
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