For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

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

With increase in temperature, the thermal conductivity of most liquids

A

Increases

B

Decreases

C

Remains same

D

First increases upto a certain temperature and then becomes constant

For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.

A

Sodium chloride

B

Sodium carbonate monohydrate

C

Anhydrous sodium sulphate

D

Hypo

Thermal conductivities of most of the liquids __________ with rise in temperature.

A

Increases

B

Decreases

C

Remains unchanged

D

May increase or decrease; depends on the liquid

With increase in temperature, the solubility of gases in liquids, at fixed pressure

A

Increases

B

Decreases

C

Remains same

D

Either A or B, depends on the system

Among liquids, water has a comparatively high value of thermal conductivity, due to its

A

Low density

B

High viscosity

C

Partial ionisation

D

Dense structure

At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

A

Higher

B

Lower

C

Same

D

Unpredictable

Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.

A

Copper

B

Steel

C

Aluminium

D

Brass

At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

A

Decrease

B

Increase

C

Remain unchanged

D

May increase or decrease; depends on the pressure

A delivery car went from Candleford to Lark Rise and back at an average speed of23 miles per hour. If the distance from Candleford to Lark Rise is 1 mile, and the trip back too half as much time as the trip there, what was the average speed of the delivery car on the way to Lark Rise?

A

13

B

34

C

12

D

23

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

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