A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Fuels and Combustion
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Lack of thorough mixing of fuel with air

Presence of large quantity of hydrogen in the fuel

High sulphur content in the fuel

Low calorific value of the fuel

Lack of thorough mixing of fuel with air

Presence of large quantity of hydrogen in the fuel

High sulphur content in the fuel

Low calorific value of the fuel

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Fuels and Combustion
Which is the heaviest fuel gas out of the following?

Coke oven gas

Water gas

Carburetted water gas

Blast furnace gas

Coke oven gas

Water gas

Carburetted water gas

Blast furnace gas

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Fuels and Combustion
Stack heat losses can be minimised by

Maintaining proper draft in the furnace

Controlling the excess air

Oxygen enrichment of combustion air

Using low c.v. fuels

Maintaining proper draft in the furnace

Controlling the excess air

Oxygen enrichment of combustion air

Using low c.v. fuels

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Fuels and Combustion
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

Unpredictable

< 1

1

> 1

Unpredictable

< 1

1

> 1

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Fuels and Combustion
Presence of free moisture in coal during its high temperature carbonisation

Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

Reduces the coking time

Increases the loss of fine coal dust from the ovens when charging

None of these

Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

Reduces the coking time

Increases the loss of fine coal dust from the ovens when charging

None of these

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Fuels and Combustion
With increase in calorific value of fuels, their adiabatic flame temperatures

Decrease

May increase or decrease ; depends on the quantity of products of combustion

Remain unchanged

Increase

Decrease

May increase or decrease ; depends on the quantity of products of combustion

Remain unchanged

Increase

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Fuels and Combustion

Fuels and Combustion A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Fuels and Combustion Which is the heaviest fuel gas out of the following?

Fuels and Combustion Stack heat losses can be minimised by

Fuels and Combustion The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

Fuels and Combustion Presence of free moisture in coal during its high temperature carbonisation

Fuels and Combustion With increase in calorific value of fuels, their adiabatic flame temperatures

Fuels and Combustion
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Fuels and Combustion
Which is the heaviest fuel gas out of the following?

Fuels and Combustion
Stack heat losses can be minimised by

Fuels and Combustion
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

Fuels and Combustion
Presence of free moisture in coal during its high temperature carbonisation

Fuels and Combustion
With increase in calorific value of fuels, their adiabatic flame temperatures