Question: ‘Fat coals’ are those coals which have very high
[A].

caking capacity.

[B].

volatile matter content.

[C].

fusion point of its ash.

[D].

inherent moisture content.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Caking index of coal blend used for blast furnace coke making is about
[A].

8

[B].

12

[C].

22

[D].

36

Answer: Option C

Explanation:

No answer description available for this question.

Question: During combustion of coal on grate, clinker formation is increased by the
[A].

use of thick fire bed.

[B].

low fusion point of ash (< 1100° C).

[C].

use of preheated primary air.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Mineral matter content (M) and ash content (A) in coal are approximately related as
[A].

M = 1.1A

[B].

M = A

[C].

M = 1.5A

[D].

M = 2A

Answer: Option A

Explanation:

No answer description available for this question.

Question: Low temperature oxidation of coal is accelerated by the
[A].

storage in large heaps.

[B].

storage in compressed piles.

[C].

absence of porous or friable particles.

[D].

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

Answer: Option A

Explanation:

No answer description available for this question.

Question: Low temperature oxidation of coal during storage does not decrease its
[A].

oxygen content

[B].

caking power

[C].

calorific value

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Assam coals suffers mainly from the disadvantage of high __________ content.
[A].

ash

[B].

volatile matter

[C].

sulphur (4-6%)

[D].

moisture

Answer: Option C

Explanation:

No answer description available for this question.