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Heat Transfer - Interview Questions and Answers

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76. Planck's law holds good for
A. black bodies
B. polished bodies
C. all colored bodies
D. all of the above
E. none of the above.
Explanation:
77. The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit
A. temperature
B. thickness
C. area
D. time
E. area and time.
Explanation:
78. Temperature of steam at around 540�C canbe measured by
A. thermometer
B. radiatiouv pyrometer
C. thermistor
D. thermocouple
E. thermopile.
Explanation:
79. Two plates spaced 150 mm apart are maintained at 1000�C and 70�C. The heat transfer will take place mainly by
A. convection
B. free convection
C. forced convection
D. radiation
E. radiation and convection.
Explanation:
80. The ratio of the energy absorbed by the body to total energy falling on it is called
A. absorptive power
B. emissive power
C. absorptivity
D. emissivity
E. none of the above.
Explanation:
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