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

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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.

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) ?

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

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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.

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.

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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.