Fuels and Combustion - Section 1 (4)

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.

25.

Higher percentage of ash in coal meant for the production of metallurgical grade coke

A.	decreases the hardness of coke.
B.	decreases the abrasion resistance of coke.
C.	causes brittleness in steel.
D.	none of these.

Answer: Option D

Explanation:

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

26.

Gross & net calorific value is the same for

A.	blast furnace gas
B.	coke oven gas
C.	L.D. converter gas
D.	none of these

Answer: Option C

Explanation:

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27.

Natural draught produced by a chimney depends upon the

A.	density of the chimney gases.
B.	height of the chimney.
C.	both (a) and (b).
D.	neither (a) nor (b).

Answer: Option C

Explanation:

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28.

Which of the following accentuates clinker-ing trouble on furnace grate burning coal ?

A.	Low reactivity of carbonised residue containing high proportions of iron & sulphur.
B.	Low forced draught and fuel bed temperature.
C.	Thick fire bed and preheated primary air.
D.	All (a), (b) and (c).

Answer: Option D

Explanation:

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29.

Carbon Content by weight in air dried wood may be about __________ percent.

A.	10
B.	25
C.	50
D.	80

Answer: Option C

Explanation:

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30.

A coal having high amount of volatile matter

A.	would require smaller combustion chamber.
B.	produces very little of tar and gas on carbonisation.
C.	ignites easily and burns with long smoky flame.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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31.

Ratio of primary air to secondary air increases with increase in the rank of coal, because the

A.	high rank coals have higher amount of volatile matter.
B.	ratio of fixed carbon to volatile matter increases.
C.	oxygen content progressively decreases.
D.	calorific value of the coal increases.

Answer: Option B

Explanation:

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32.

Bituminous coal

A.	ignites less easily than anthracite.
B.	is generally coking.
C.	burns with smoky yellow flame.
D.	both (b) and (c).

Answer: Option D

Explanation:

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