A. Thickness of plastic layer

B. Gray-king index

C. Swelling index

B. Ammonia

C. Coke oven gas

D. Tar

B. 6

C. 12

D. 18

A. Decreases

C. Remain constant

D. None of these

A. in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)

B. Controlling the dust nuisance while charging the coal

C. Prevention of clinker formation in the oven

E. Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO &

B. Is not possible on commercial scale

C. Does not alter its calorific value

D. Decreases its calorific value

A. More than 105.7 metres

B. Infinitely long

D. 200 meters

A. 5000

B. 300

C. 10000

A. Increases

B. Decreases

D. Remain constant

A. Remain same

C. Decreases

D. May increase or decrease depending on the type of fuel

A. Dry gas/stack gas loss

B. Moisture loss

D. Incomplete combustion

A. Tar

B. Pulverised coke

C. Pitch

A. Contributes to its heating value

B. Affects the quality of steel produced as cracks develop on the surface while rolling the steel

D. Neither A. nor B.

A. Swelling number increases

B. Calorific value increases

C. Bulk density decreases

A. Fuel

B. Air

D. Neither A. nor B.

A. Long flame

B. Condensation of water vapour from the fuel gas

C. None of these

A. Sensible

B. Latent

C. None of these

A. High production of CO2

B. Low production of CO2

C. High production of CO

B. Convert CO to CO2

C. Increase the gas production rate

D. Increase the combustion rate

B. 1

C. 6

D. 4

A. Is equal to the heat of formation

C. Cant be known without calculating it

D. Is always positive

B. Less reactive

C. Stronger

D. Smaller in size

A. Iron silicate

C. Iron sulphate

D. Lime and magnesia

A. Structural strength of silica bricks

B. Problem in door cleaning

C. Buckling of ram of pusher car at the time of coke pushing

B. Liptinite

C. Micrinite

D. Fusinite

A. As a motor fuel blend

B. For producing benzene, toluene & xylene by its distillation

D. Neither A. nor B.

B. 5

C. 55

D. 75

A. To check against its excessive swelling during heating, which may exert high pressure and

B. age coke oven walls

C. Because, it alone produces unreactive coke

E. Neither A. nor B.

A. Volatile matter in coke is zero

B. Yield of tar is about 3% of dry coal

C. Yield of coke oven gas is 290 Nm3 /ton dry coal

A. Ignites easily and burns with long smoky flame

C. Would require smaller combustion chamber

D. Produces very little of tar and gas on carbonisation

A. Light paraffinic fuel oils is equal to that of equivalent olefins

C. Light paraffinic fuel oils is lower than that of equivalent olefins

D. n-paraffin is lower than that of iso-paraffins of the same compounds

A. None of these

B. Ammonium nitrate

C. Ammonium phosphate

A. Resistance to impact breakage

B. Agglutinating properties

D. Abradability

B. Oxygen enriched air

C. None of these

D. Air

B. Quantity of flue gas

C. Flame length

D. Ignition temperature

A. Lower calorific value at constant pressure

C. Net calorific value at constant volume

D. Gross calorific value at constant pressure

A. Blast furnace gas

B. Pitch

C. Bituminous coal

A. Ignites less easily than anthracite

B. Is generally coking

C. Burns with smoky yellow flame

A. 95 and 100

B. 25 and 97

C. 40 and 70

A. Sulphur content

B. Ignition temperature

D. Calorific value

A. CO2 & H2

C. CO2 & N2

D. CO & H2

A. Very low calorific value coke oven gas

C. No by-products

D. Metallurgical coke

B. None of these

C. Boys

D. Junkers

A. Gas yield is less

B. Ignition temperature of coke produced is less

D. Tar yield is more

A. Ash fusion temperature

C. Caking index

D. Calorific value

A. Hydrogen

C. Sulphur

D. Carbon

A. None of these

C. Produce larger quantity of coke oven gas

D. Are soft & friable (poor strength and size stability)

B. Unburnt carbon in flue gases

C. Incomplete combustion

D. Ash content in the fuel

B. Moisture

C. Volatile matter

D. Ash

A. Is non-coking

B. Contains more than 90% durain

D. Contains more than 90% fussain