Which of the metals has the maximum thermal conductivity?

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

Which of the following liquid metals has the highest thermal conductivity?

A

Molten sodium

B

Molten lead

C

Mercury

D

Molten potassium

Thermal conductivity of solid metals with rise in temperature normally

A

Increases

B

Decreases

C

Remain constant

D

May increase or decrease depending on temperature

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

A

$$\frac{1}{{\text{k}}}$$

B

k

C

k²

D

$$\frac{1}{{{{\text{k}}^2}}}$$

Which of the following has maximum value of thermal conductivity?

A

Aluminium

B

Steel

C

Brass

D

Copper

Which of the following has maximum thermal conductivity at the same temperature?

A

Steel

B

Petrol

C

Air

D

All of the above

Which of the following has maximum thermal conductivity?

A

Iron

B

Coal

C

Nitrogen

D

Tar

Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

A

Varistors

B

Thermistor

C

Semiconductors

D

Variable resistors

Which of the following has the highest value of thermal conductivity?

A

Water

B

Steam

C

Solid ice

D

Melting ice

Which of the metals has the maximum thermal conductivity?

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