Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.

Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.

A

Natural

B

Induced

C

Forced

D

Chimney

Two outlets of a motor manufacturing company reported that revenue from outlet x in 2013 was down 11 percent from 2012. and revenue from outlet Y in 2013 were up 7 percent from 2012. If total revenue from outlet X & Y in 2013 was up 1 percent from 2012, what is the ratio of revenue from outlet X in 2012 revenue from outlet Y in 2012?

A

1 : 2

B

4: 5

C

1 : 1

D

3: 2

Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

A

[

A.

B.

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

White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

A

Tar

B

Coke oven gas

C

Pitch

D

Pulverised coke

Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.

A

0.5

B

500

C

10

D

50

Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

A

Low amount of excess combustion air

B

Large quantity of excess combustion air

C

Hydrocarbon fuel

D

Pulverised coal as fuel

The draught produced, for a given height of the chimney and given mean temperature of chimney gases

A

decreases with increase in outside air temperature

B

increases with increase in outside air temperature

C

remains the same irrespective of outside air temperature

D

may increase or decrease with increase in outside air temperature

Smoke density of the flue gas going out of the chimney is measured by a

A

Polarograph

B

Thermal conductivity meter

C

Photo electric cell

D

Chromatograph

Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

A

Higher effectiveness of boiler

B

High calorific value coal being burnt

C

Fouling of heat transfer surfaces

D

Raising of steam temperature

Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.

Related Questions