The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.

Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

A

It contains large amount of volatile matter

B

It is stored in tall heaps

C

Smaller fines are stored in large quantity

D

All of the above

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

A

Shallow and small piles

B

Fine sizes without the presence of any lump

C

Closed space without any ventilation facility

D

Large heaps with small surface to volume ratio

Tareq was a bright student।বাক্যটিতে bright শব্দটি কোন পদ?

A

noun

B

adjective

C

adverb

D

verb

Lamp A is less bright than Lamp B; Lamp B is less brighter than Lamp C; Lamp C is as bright as Lamp D. Lamp B is brighter than Lamp D and Lamp D is brighter than Lamp A. Which lamp is the brightest ?

A

Lamp A

B

Lamp B

C

Lamp C

D

Lamp D

Lamp A is less bright than Lamp B; Lamp B is Brighter than lamp C; Lamp C is as bright as Lamp D. Lamp B is brighter than Lamb D and Lamp D is better than Lamp A. Which is the brightest?

A

Lamp A

B

Lamp B

C

Lamp C

D

Lamp D

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

Combustion of pulverised coal as compared to that of lump coal

A

Develops a non-luminous flame

B

Develops a low temperature flame

C

Can be done with less excess air

D

Provides a lower rate of heat release

Combustion of pulverised coal compared to the lumpy coal

A

Provides better control of furnace temperature

B

Facilitates combustion with lower excess air

C

Provides higher thermal efficiency & flame temperature

D

All of the above

Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?

A

Vitrain

B

Clarain

C

Durain

D

Fussain

Bright coal

A

Contains more than 90% durain

B

Contains more than 90% fussain

C

Contains mainly vitrain & clarain and is generally coking

D

Is non-coking

The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.

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