Fuels and Combustion

Question: A coal with high __________ content, would ignite most easily.
[A].

fixed carbon

[B].

volatile matter

[C].

ash

[D].

oxygen

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Low temperature oxidation of stored coal results in the
[A].

decrease in its caking power & calorific value.

[B].

decrease in its carbon & hydrogen content.

[C].

increase in its oxygen content.

[D].

all (a), (b) and (a).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Cannel coal
[A].

is non-coking.

[B].

has a high volatile matter content and burns with a luminous smoky flame.

[C].

is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: A coal containing very high percentage of durain is called __________ coal.
[A].

bright

[B].

splint

[C].

non-banded

[D].

boghead

Answer: Option B

Explanation:

No answer description available for this question.

Question: Bright coal
[A].

contains more than 90% durain.

[B].

contains more than 90% fussain.

[C].

contains mainly vitrain & clarain and is generally coking.

[D].

is non-coking.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Fussain
[A].

is friable, charcoal like substance.

[B].

has highest fixed carbon and lowest volatile matter content of all the four banded components of coal.

[C].

is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
[A].

1000

[B].

4000

[C].

8000

[D].

15000

Answer: Option C

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Anthracite coal
[A].

contains more volatile matter than bituminous coal.

[B].

ignites more easily than bituminous coal.

[C].

is essentially a coking coal.

[D].

burns with short, bluish, yellow-tipped flame producing very little smoke.

Answer: Option D

Explanation:

No answer description available for this question.