Related Questions

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 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
With increase in temperature, the electrical conductivity of a __________ decreases.
A Semi-conductor
B Metal or alloy
C Dielectric
D None of these
The electrical conductivity of a __________ decreases with rise in temperature.
A Metal/alloy
B Semi-conductor
C Dielectric
D None of these
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
With increase in temperature, the thermal conductivity of fresh lubricating oil
A Increases
B Decreases
C Remains unchanged
D May increase or decrease; depends on its composition
With increase in temperature, the thermal conductivity of non-metallic amorphous solids
A Decreases
B Increases
C Remains constant
D First decreases upto certain temperature and then increases
With increase in temperature, the thermal conductivity of a gas
A Increases
B Decreases
C Remains same
D May increase or decrease depending on the type of gas

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