Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.

A

Small differential

B

Atmospheric

C

Absolute

D

Gage

Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm).

A

H

B

12.6 H

C

13.6 H

D

14.6 H

For the same draught produced the power of induced draught fan as compared to forced draught fan is

A

less

B

more

C

same

D

not predictable

Power required in case of forced draught as compared to induced draught (for the same draught produced) is

A

Same

B

Less

C

More

D

Either more or less; depends on the flue gas density

A balanced draught boiler furnace employs __________ draught fan.

A

Induced

B

Forced

C

Both A & B

D

Neither A nor B

In a furnace employing forced draught as compared to induced draught,

A

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

B

The fan operates hot and hence blades are liable to corrosion and erosion

C

Positive pressure exists in the furnace

D

None of these

Which of the following is a commonly used manometric liquid for low pressure range?

A

Ethyl alcohol

B

Carbon tetrachloride

C

Glycerol

D

Ethylene glycol

Dome temperature of blast furnace stove is most accurately measured by a

A

Radiation pyrometer

B

Platinum-platinum/rhodium ther-mocuple

C

Iron-constantan thermocouple

D

Platinum resistance thermometer

The velocity ratio in case of an inclined plane inclined at angle 'θ' to the horizontal and weight being pulled up the inclined plane by vertical effort is

A

sinθ

B

cosθ

C

tanθ

D

cosecθ

The angle of contact between a glass capillary tube of length 10 cm and a liquid is 90 degree . If the capillary tube is dipped vertically in the liquid, then the liquid:

A

Will rise in the tube

B

Will get depressed in the tube

C

Will rise -up to 10 cm in the tube and will over flow

D

Will neither rise nor fall in the tube.

Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

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