Maximum permissible air velocity in pipelines is about __________ metre/second.

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.