A. Preheated secondary air

B. Very little excess air

D. Low amount/current of combustion air

A. Colloidal fuels

B. Coal briquettes

D. LPG

B. 1

C. 100

D. 50

A. Lengthens the flame

B. Causes heat loss of fuel by its partial combustion

D. Shortens the flame

A. Pitch

B. Tar

C. Molasses

B. Angle of repose of coal increases with its increasing size

C. Specific gravity of coal increases with its increasing maturity

D. Refractive index and reflectance of coal increases with the increasing rank of coal

E. io of coal</strong>

A. Smokeless burning

B. High calorific value

D. Less erosion on furnace walls

A. 1400-1500

C. 400-500

D. 1700-1800

A. Lignites

B. Semi-anthracites

D. Anthracites

A. No possibility of obtaining complete combustion at high temperature

B. Always loss of heat from the flame

D. Neither A. nor B.

A. Increases its caking power

C. Reduces its calorific value

D. Is not undesirable

A. Is a moving bed reactor

C. Cannot use coking coal

D. Operate at very high pressure

A. Decrease in its caking capacity

B. Increase in its friability

C. Reduction in coal size

B. > 280

C. > 120

D. 300-600

B. Low octane number

C. Low calorific value

D. Low flash point

B. Lignite

C. Peat

D. Sub-bituminous coal

A. Adopting proper fuel firing technique & fuel preparation

B. Preheating of fuel gases & combustion air

D. Supplying correct amount of combustion air

B. Anthracite coal

C. Blast furnace coke

D. Sub-bituminous coal

A. Less volatile matter

B. Greater percentage of ash

D. More carbon

A. Convert CO to CO2

C. Increase the combustion rate

D. Increase the gas production rate

A. Radium

B. Uranium

C. Neptunium

A. Ignites less easily than anthracite

B. Is generally coking

C. Burns with smoky yellow flame

A. Coal middling from washeries

B. Furnace oil, light diesel oil and tar/PCM

D. B.F. gas, coke oven gas and L.D. converter gas

A. Produces very little of tar and gas on carbonisation

B. Ignites easily and burns with long smoky flame

C. Would require smaller combustion chamber

B. Either A. or B.

C. Oxygen

D. Air

A. Vulcanised rubber is more elastic than natural rubber

B. Polymers made of more than one monomer is called copolymer or mixed polymer

C. res

D. The intermolecular forces in thermoplastic polymers are intermediate to that of elastomers &

A. Coke oven gas

C. Carburetted water gas

D. Water gas

A. Fuel consumption in coking

C. Time of carbonisation

D. Yield of gas and tar

A. Speed of the fan

B. Variation in the pitch of the fan blades

C. Damper

A. Chances of clinker formation

B. Requirement of large volume combustion chamber

D. Incomplete combustion of coal

A. 20,000

B. 5,000

D. 15,000

A. 60-65

C. 95-100

D. 5-Mar

A. Scale losses of the furnace stock

C. Calorific value of the fuel

D. None of these

B. The one which is present in the residue after combustion

C. That present in volatile matters

D. The total quantity of carbon present in the coal

B. Size stability

C. Caking tendency

D. Coking tendency

A. Require less time of carbonisation

C. Produce stronger coke

D. Produce smaller coke

A. 800

C. 4500

D. 10000

B. Low fusion point of ash (< 1100 C)

C. Use of thick fire bed

D. Use of preheated primary air

B. 1500

C. 8500

D. 5400

A. 70

B. 50

D. 85

B. 25

C. 10

D. 90

A. More or less; (depends on the state of fuel.)

B. More

D. Equal

A. H2O

B. CH4

C. CO2

B. 280-300

C. 200-300

D. 250-270

A. N2 & CH4

C. CH4 & CO2

D. N2 & H2

B. Higher reactivity

C. Lower strength

D. Lower bulk density

A. One week

B. 12 hours

C. Two weeks

A. Bituminous coal

B. Lignite

D. Anthracite

A. CO

C. CH4

D. H2

A. 0.21

B. 0.79

C. 4.76