A coal having high amount of volatile matter

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 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

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

A coal having higher volatile matter content will necessarily have lower

A

Ash fusion temperature

B

Calorific value

C

Ignition temperature

D

Caking index

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

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 in coking coal may be about __________ percent.

A

1

B

7

C

22

D

46

Underfeed stokers work best for __________ coals high in volatile matter and with caking tendency

A

Anthracite

B

Lignite

C

Semi-bituminous and bituminous

D

All of the above

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

In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.

A

Concentrate

B

Tailing

C

Middling

D

None of these

A coal having high amount of volatile matter

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