Fuels And Combustion MCQ Questions & Answers

1

Stack heat losses can be minimised by

A) Controlling the excess air B) Oxygen enrichment of combustion air C) Using low c.v. fuels D) Maintaining proper draft in the furnace

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Answer & Solution

Answer: Option A

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2

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

A) CO B) CO₂ C) H₂ D) CH₄

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Answer & Solution

Answer: Option D

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3

Natural draft created by the chimney depends upon

A) Temperature of the flue gas B) Its height C) Both A & B D) Neither A nor B

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Answer & Solution

Answer: Option C

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4

The cooling medium used in dry quenching of coke is

A) Nitrogen B) Air C) Phenolic water D) Carbon dioxide

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Answer & Solution

Answer: Option A

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5

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

A) 400-500 B) 900-1000 C) 1400-1500 D) 1700-1800

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Answer & Solution

Answer: Option B

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6

L.D. converter gas (produced in steel plant) comprises mainly of

A) CO (upto 65%) & CO₂ B) CO₂ & H₂ C) CO & O₂ D) CO₂ & O₂

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Answer & Solution

Answer: Option A

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7

Which of the following fuel gases is heavier than air?

A) Blast furnace gas B) Coke oven gas C) Natural gas D) Water gas

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Answer & Solution

Answer: Option A

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8

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

A) 80 and 97 B) 95 and 100 C) 40 and 70 D) 25 and 97

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Answer & Solution

Answer: Option A

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9

Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

A) Higher calorific value B) Lower hydrogen content C) Both A & B D) Neither A nor B

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Answer & Solution

Answer: Option D

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10

As the equilibrium moisture content of the coal increases, its

A) Calorific value increases B) Swelling number decreases C) Swelling number increases D) Bulk density decreases

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Answer & Solution

Answer: Option B

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Fuels And Combustion MCQ Questions & Answers | Chemical Engineering