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.Management Sciences
Category: Heat Transfer
The thermal diffusivities for solids are generally__________________?
A. less than those for gases
B. jess than those for liquids
C. more than those for liquids and gases
D. more or less same as for liquids and gases
E. zerci
Thermal conductivity of glass-wool varies from sample to sample because of variation in ________________ ?
A. composition
B. density
C. porosity
D. structure
E. all of the above
The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?
A. shorter wavelength
B. longer wavelength
C. remains same at all wavelengths
D. wavelength has nothing to do with it
E. none of the above
Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. unpredictable
Temperature of steam at around 540°C can be measured by ____________________?
A. thermometer
B. radiatiouv pyrometer
C. thermistor
D. thermocouple
E. thermopile
According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?
A. absolute temperature (T)
B. I2
C. f
D. t
E. 1/r
The insulation ability of an insulator with the presence of moisture would_________________?
A. increase
B. decrease
C. remain unaffected
D. may increase/decrease depending on temperature and thickness of insulation
E. none of the above
Which of the following is a case of steady state heat transfer ___________________?
A. I.C. engine
B. air preheaters
C. heating of building in winter
D. all of the above
E. none of the above
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