Heat Transfer

491. With increase in temperature, the total emissivity of conductors

1. Increases
2. Decreases
3. Remain same
4. Decreases linearly

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492. With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer

1. Decreases
2. Increases
3. Increases exponentially
4. Remain unaffected

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493. With the increase of temperature, the Col-burn jH factor

1. Increases
2. Decreases
3. Remains unchanged
4. May increase or decrease; depending on temperature

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