Fuels and Combustion - Section 1

Directions to Solve

Fuels and Combustion - Section 1

Fuels and Combustion is a field and there are problems available to
solve in this category. You will find the MCQs and can solve them easily.

1.

Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

A.	requirement of large volume combustion chamber.
B.	risk of explosion.
C.	chances of clinker formation.
D.	incomplete combustion of coal.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

2.

Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.

A.	60
B.	160
C.	500
D.	750

Answer: Option B

Explanation:

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3.

The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.

A.	100 to 150
B.	350 to 450
C.	550 to 650
D.	700 to 850

Answer: Option B

Explanation:

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4.

The gas which contributes maximum to the heating value of natural gas is

A.	CO
B.	CO 2
C.	H 2
D.	CH 4

Answer: Option D

Explanation:

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5.

When incomplete combustion loss is high, the flue gas analysis shows large amount of

A.	CO 2
B.	CO
C.	O 2
D.	C

Answer: Option B

Explanation:

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6.

In high temperature carbonisation of coal compared to low temperature carbonisation

A.	yield of ammonia is less.
B.	aromatic content of tar is low.
C.	H 2 content in the coke oven gas is more.
D.	calorific value of the coke oven gas is lower.

Answer: Option C

Explanation:

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7.

Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.

A.	<120
B.	>120
C.	<90
D.	90-110

Answer: Option B

Explanation:

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8.

Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?

A.	Benzol
B.	Pitch-cresosote mixture (PCM)
C.	Napthalene
D.	Ethylene

Answer: Option D

Explanation:

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