A coal having higher volatile matter content will necessarily have lower

A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

A

Is less liable to spontaneous combustion on storage

B

Is more difficult to ignite and produces a shorter flame

C

Requires smaller combustion space and less secondary air

D

None of these

A coal having higher volatile matter content, has lower

A

Smoking tendency on burning

B

Coke oven gas yield on carbonisation

C

Chance of catching fire during storage in open space

D

Ignition temperature

A coal having high volatile matter content will

A

Give less yield of tar and gas on carbonisation

B

Burn with a small non-smoky flame

C

Have a very high calorific value

D

None of these

Volatile matter content in coking coal may be about __________ percent.

A

1

B

7

C

22

D

46

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 of the above

A coal containing high amount of volatile matter will have

A

Low ignition temperature

B

Very little ash content

C

High fusion point of its ash

D

Low adiabatic flame temperature

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

Which of the following type of coal has the lowest proportion of volatile matter ?

A

Lignite

B

Peat

C

Bituminous

D

Anthracite

Volatile matter content of metallurgical coke may be around __________ percent.

A

1-2

B

10-15

C

22-26

D

30-33

Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.

A

1000

B

4000

C

6000

D

8000

A coal having higher volatile matter content will necessarily have lower

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