A. 15,000

B. 10,000

C. 5000

A. None of these

B. Kopper-Totzek

D. Winkler

A. 1500

B. 100

C. 1000

A. C2H2

B. H2

D. C2H6

B. Increases its caking power

C. Is not undesirable

D. Reduces its calorific value

A. Bituminous

C. Semi-anthracite

D. Lignite

A. Air

B. Either A. or B.

C. Oxygen

A. H2

B. CO

C. None of these

A. Producer gas

C. Coke oven gas

D. Natural gas

A. Decreases the dew point

B. Increases the dew point

C. Reduces the combustion efficiency by limiting the permissible temperature reduction

B. 145

C. 85

D. 70

A. Emissivity factor is higher

B. Flue gas has lower dew point thereby facilitating more waste heat recovery

C. Sulphur content is lower

A. CO

C. CO2

D. H2

A. 79

B. 29

C. 77

A. More

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

D. Equal

B. Excessive fly-ash discharge from the stack

C. High power consumption in its transportation

D. Erosion of induced draft fan blades

A. 10

B. 25

D. 45

A. In between 0 and 100

B. More than 100

C. 0

A. Alumina

B. Zinc oxide

C. Thorium oxide

A. Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is

B. Has a high volatile matter content and burns with a luminous smoky flame

C. Is non-coking

E. named

A. Carburetted water gas

C. Natural gas

D. Gobar gas

A. Methane

B. Hydrogen

C. Carbon monoxide

B. Drying of coal

C. Transportation of coal

D. Preheating the primary air

A. Oxygen

C. Carbon monoxide

D. Hydrogen

A. None of these

B. Humic coals

C. Liptobiolites

A. Coke oven gas

B. None of these

D. Natural gas

A. 48

B. 5

C. 40

B. Low ash content

C. Low calorific value

D. Non smoking tendency

A. 10000

B. 1000

D. 5000

B. Increases the time of carbonisation

C. None of these

D. Produces larger size coke

A. 25

C. 90

D. 10

A. Caking index

C. Ash content

D. Both B. and C.

A. None of these

B. Lower than

D. Same as

A. Combustion of fire slacks on the grates

B. None of these

C. Handling (e.g. when emptying wagons)

B. LPG

C. Petrol

D. Diesel

A. Damper

B. Variation in the pitch of the fan blades

C. Speed of the fan

A. Moisture content

B. Volatile matter content

D. Ash content

A. Caking

B. Pulverised

D. High ash

B. Main constituents of LPG are propane and butane

C. C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)

D. C.V. of natural gas is about 10000 KCal/Nm3

B. Washing lump coal (> 80 mm size)

C. All A., B. and C.

D. Removing ash from the coal based on difference in specific gravity of coal and ash

A. Moving

B. Fluidised

D. Fixed

B. Colloidal fuels

C. Soft coke

D. Charcoal

A. Insecticides (e.g. moth balls)

B. Unsaturated polyesters

D. Drug intermediates e.g. ?-naphthol

A. Supplying correct quantity of combustion air

B. Proper fuel preparation

D. Adopting efficient-fuel firing technique & equipment

A. Unsaturated hydrocarbons

B. Methane

C. All A., B. and C.

B. 1 to 2

C. 20 to 40

D. 3 to 4

A. Increase in the c.v. of coke oven gas

C. No change in the c.v. of coke oven gas

D. Increase in its throughput

A. Fat coals

B. Liquid fuels

D. Solid fuels

A. With increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases

B. Oxygen content decreases from lignite to bituminous coal as the coalification increases

D. The less the oxygen content, better is the coal, as it reduces the calorific value

A. 5

C. 25

D. 80