Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.

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

Calorific value of dry wood may be around __________ Kcal/kg.

A

5

B

50

C

500

D

5000

Calorific value of bituminous coal may be around __________ Kcal/kg.

A

500

B

1500

C

6500

D

20000

Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.

A

3-5

B

25-30

C

60-65

D

95-100

Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

A

GCV at constant pressure

B

GCV at constant volume

C

NCV at constant pressure

D

NCV at constant volume

A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

A

More

B

Less

C

Same

D

Data insufficient; can't be predicted

Gross calorific value will be equal to the net calorific value for

A

H₂

B

C₂H₂

C

CO

D

C₂H₆

Anthracite coal

A

Contains more volatile matter than bituminous coal

B

Ignites more easily than bituminous coal

C

Is essentially a coking coal

D

Burns with short, bluish, yellow-tipped flame producing very little smoke

Efficient burning of anthracite coal requires

A

Low preheat of air

B

Fine grinding

C

High excess air

D

All of the above

Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.

A

Sulphur

B

Oxygen

C

Hydrogen

D

Carbon

Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.

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