B. Water gas

C. Carburetted water gas

D. Coke oven gas

A. 15 & 8

C. 3 & 10

D. 10 & 20

A. Is present upto 1-2%

C. Is recovered as ammonia during its carbonisation

D. Comes from protein in parent vegetable matter

A. Produce weak coke

B. Produce strong coke

C. May damage the coke oven walls during carbonisation

A. Two

C. Six

D. Five

A. Smoke

B. Oxygen

D. Temperature

A. Pitch

B. Refinery gas

C. Blast furnace gas

A. Any of the above

B. Flue gas temperature

C. Flame temperature

A. Coke oven gas

B. Producer gas

C. Blast furnace gas

A. Bulk density

B. Reactivity

A. Low fusion point of ash

B. High caking index

C. Very low ash content (8-10%)

A. 7

C. 46

D. 1

A. Wet scrubber

B. Hydrocyclones

D. Multicyclones

B. 800

C. 4500

D. 10000

A. 27.6

B. 47.3

D. 42.9

A. Burning on travelling grate

B. All A., B. and C.

D. Burning on firebars

A. Bulk density always decreases

B. Clinkering tendency during combustion increases

C. Calorific value increases sometimes

B. 9000

C. 4500

D. 500

A. Inherent moisture content

B. Volatile matter content

D. Fusion point of its ash

A. Anthracite containing 10% volatile matter and 8% ash

B. Semi-bituminous coal containing 25% ash and 20% volatile matter

D. Bituminous coal containing 20% ash and 25% volatile matter

B. Anthracite

C. Coke

D. Coal having high fusion point of its ash

B. Unburnt gases

C. Yellow

D. Luminous

A. Shift conversion

C. Reduction

D. Neumann reversal

A. 8

C. 14

D. 52

A. Use of pure oxygen for combustion instead of air

B. Increase in gas pressure

D. Increase in temperature (i.e. preheating)

B. Rotary cup

C. Submerged combustion

D. Outside mixing/diffusion flame/nozzle mix type

A. Air

B. Phenolic water

D. Carbon dioxide

A. Electricity

B. Coke oven gas

C. Mixed gas

A. Higher than

B. Not related to

D. Same as

A. High calorific value

B. Less erosion on furnace walls

C. Smokeless burning

B. Plutonium

C. None of these

D. Radium

B. Is more for low volatile coal compared to high volatile coal

C. Does not vary with increase in surface area

D. Decreases with increase in surface area

A. Must contain moderate quantities of ash, moisture, sulphur and volatile matters

B. Should have low fusion point of its ash

D. Should be brittle

A. CO

B. CO2

C. H2O

A. Sub-bituminous coal

B. Peat

D. Lignite

A. 5

B. 50

D. 15

A. causes its spalling due to different co-efficient of expansion/contraction of the refractory

B. boiler tubes thereby reducing the heat transfer

C. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber

D. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace

F. the ash

A. Alumina

B. Silica gel

C. Vanadium

B. Very little excess air

C. Preheated secondary air

D. Low amount/current of combustion air

A. 6500

C. 4200

D. 1800

A. Volatile matter content

C. Abradability

D. Phosphorus content

B. Produced by low temperature carbonisation of coal

C. None of these

D. A domestic fuel

A. Blast furnace gas

B. Coke oven gas

D. Hydrogen

B. Reactivity

C. Abradability

D. Porosity

A. Smoking tendency on burning

B. Chance of catching fire during storage in open space

C. Coke oven gas yield on carbonisation

B. Bubbling it through dilute sulphuric acid

C. Adsorption on silica gel

D. Absorption in wash oil

A. Oxidation

C. Carbonisation

D. Coalification

A. Reduces its consumption in the furnace

B. Decreases its hardness and abrasion resistance

C. Does not affect its consumption in the furnace

A. Young

B. Mature

D. Neither A nor B

B. Give less yield of tar and gas on carbonisation

C. Have a very high calorific value

D. Burn with a small non-smoky flame