Flue gas from the heating chamber of byproduct coke ovens is removed by

Coke made in narrower by-product coke ovens (as compared to wider ovens) is

A

Less reactive

B

Stronger

C

Smaller in size

D

All of the above

Narrow coke ovens as compared to wider coke ovens

A

Produce smaller coke

B

Produce stronger coke

C

Require less time of carbonisation

D

All of the above

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

Determine the height of the chimney to produce a static draught of 22mm of water if the mean flue gas temperature in chimney is 290oC and ambient temperature in boiler house is 20oC. The gas constant for air is 29.26Kgm/Kgk and for chimney flue gas is 26.2 Kgfm/Kgk. Assume reading as 760mm of mercury?

A

38.42m

B

42.55m

C

45.84m

D

44.03m

High rate of heating of coke ovens

A

May damage its walls due to abrupt excessive swelling of coal

B

Produces larger size coke

C

Increases the time of carbonisation

D

None of these

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

A

Through a metallic wall

B

By direct contact of hot flue gas with air

C

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

D

None of these

Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by

A

Chlorination

B

Treating in biological oxygen pond

C

Chemical coagulation

D

None of these

The cost of 8 fans and 14 ovens is Rs. 36520. What is the cost of 12 fans and 21 ovens ?

A

Rs. 56800

B

Rs. 54780

C

Rs. 57950

D

Cannot be determined

A 15kg of air is supplied per kg of fuel burnt to the combustion chamber of a boiler using fuel 600kg/hr. the temperature of flue gases and ambient air are 273°C and 32°C. If the minimum draught required to start the flue is 9.5mm of water, find out the minimum height of the chimney?

A

22.66m

B

23.84m

C

24.52m

D

25.16m

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO₂ = 12%, O₂ = 8%, CO = nil, N₂ = 80%. This flue gas composition indicates that

A

Pure oxygen has been used for combustion

B

Nitrogen percentage in the fuel is very high

C

Excess air has been used for combustion

D

Hydrogen is not present in the fuel

Flue gas from the heating chamber of byproduct coke ovens is removed by

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