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Fuels and Combustion

A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the reminder going to CO, the Orsat analysis in volume percent is

CHEMICAL ENGINEERING, Fuels and Combustion /
Question: A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the reminder going to CO, the Orsat analysis in volume percent is
[A].

CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60

[B].

CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02

[C].

CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06

[D].

CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

Answer: Option B

Explanation:

No answer description available for this question.

A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the reminder going to CO, the Orsat analysis in volume percent is Read More »

CHEMICAL ENGINEERING, Fuels and Combustion

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3 ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

CHEMICAL ENGINEERING, Fuels and Combustion /
Question: For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3 ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
[A].

Propane and acetylene

[B].

Propane and LPG

[C].

Sewage gas and gobar gas

[D].

B.F. gas and coke oven gas

Answer: Option A

Explanation:

No answer description available for this question.

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3 ), while the C.V. is same on weight basis (i.e., kcal/kg) ? Read More »

CHEMICAL ENGINEERING, Fuels and Combustion

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will

CHEMICAL ENGINEERING, Fuels and Combustion /
Question: For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
[A].

increase

[B].

decrease

[C].

increase or decrease depending on the fuel type

[D].

not change

Answer: Option B

Explanation:

No answer description available for this question.

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will Read More »

CHEMICAL ENGINEERING, Fuels and Combustion

Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.

CHEMICAL ENGINEERING, Fuels and Combustion /
Question: Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
[A].

CO content

[B].

dew point

[C].

CO2 content

[D].

O2 content

Answer: Option A

Explanation:

No answer description available for this question.

Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases. Read More »

CHEMICAL ENGINEERING, Fuels and Combustion

Dust content in raw blast furnace gas is about __________ gm/Nm3 , hence it is cleaned to the dust level of about < 10 mg /Nm3 before use.

CHEMICAL ENGINEERING, Fuels and Combustion /
Question: Dust content in raw blast furnace gas is about __________ gm/Nm3 , hence it is cleaned to the dust level of about < 10 mg /Nm3 before use.
[A].

15-30

[B].

1-2

[C].

70-100

[D].

150-200

Answer: Option A

Explanation:

No answer description available for this question.

Dust content in raw blast furnace gas is about __________ gm/Nm3 , hence it is cleaned to the dust level of about < 10 mg /Nm3 before use. Read More »

CHEMICAL ENGINEERING, Fuels and Combustion

__________ prohibits the use of alcohols directly in petrol engines.

CHEMICAL ENGINEERING, Fuels and Combustion /
Question: __________ prohibits the use of alcohols directly in petrol engines.
[A].

Low octane number

[B].

High cost & availability

[C].

Low flash point

[D].

Low calorific value

Answer: Option B

Explanation:

No answer description available for this question.

__________ prohibits the use of alcohols directly in petrol engines. Read More »

CHEMICAL ENGINEERING, Fuels and Combustion