Related Questions

The electrical conductivity of a __________ decreases with rise in temperature.
A Metal/alloy
B Semi-conductor
C Dielectric
D None of these
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
A Decreases
B Increases
C Remains unchanged
D Increases exponentially
With increase in temperature, the electrical conductivity would
A Increase in metals as well as in intrinsic semiconductor
B Increase in metals but decrease in intrinsic semiconductor
C Decrease in metals but increase in intrinsic semiconductor
D Decrease in metals as well as in intrinsic semiconductor
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer
A Increases
B Decreases
C Remains constant
D Increases exponentially
With increase in temperature, the electrical conductivity of semiconductors
A Increases
B Decreases
C Remain constant
D Either A or B, depends on the type of semi-conductor
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.
A Hyperbolic
B Parabolic
C Linear
D Logarithmic
Thermal conductivity of a gas at low density, __________ with increase in temperature.
A Decreases
B Increases
C Remains unchanged
D May increase or decrease; depends on the gas
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
A Fireclay
B Carborundum
C Graphite
D Chromite
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.
A Parabolic
B Hyperbolic
C Linear
D Logarithmic

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