A coal with high __________ content, would ignite most easily.

A coal with high __________ content will ignite most easily.

A

Hydrogen

B

Oxygen

C

Volatile matter

D

Fixed carbon

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

Which will have the least volatile matter and hence will be the most difficult to ignite?

A

Bituminous coal

B

Coke

C

Semi-bituminous coal

D

Aanthracite

Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

A

15 to 25

B

35 to 45

C

55 to 75

D

75

Correct synonym of the word 'ignite'---

A

kindle

B

to set fire

C

to burn

D

to burn fire

Correct synonym of the word " ignite" is

A

Kindle

B

to set fire

C

to burn

D

to burn fire

A coal containing very high percentage of durain is called __________ coal.

A

Bright

B

Splint

C

Non-banded

D

Boghead

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

A good coking coal should have high __________ content.

A

Ash

B

Sulphur & phosphorus

C

Moisture

D

None of these

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 with high __________ content, would ignite most easily.

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