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.Management Sciences
Category: Heat Transfer
Temperature of steam at around 540°C can be measured by ____________________?
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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
LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?
A. higher
B. lower
C. same
D. depends on the area of heat exchanger
E. depends on temperature conditions
Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?
A. thermal resistance
B. thermal coefficient
C. temperature gradient
D. thermal conductivity
E. heat-transfer
Which of the following has maximum value of thermal conductivity________________?
A. aluminium
B. steel
C. brass
D. copper
E. lead
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