A. 700 to 850

B. 100 to 150

D. 550 to 650

A. Flame temperature achieved

B. Heat transfer rate to the stock in the furnace

C. Speed of combustion of fuel

A. Oxidation

B. Hydrolysis

D. Dehydration

A. None of these

B. Hydrogenation of coal to produce gasoline

D. Gasification of coal

B. Burning on travelling grate

C. Burning on firebars

D. All A., B. and C.

A. Same

B. Much higher

C. Either lower or higher, depends on the type of fuel

A. 75

C. 50

D. 10

B. Same as

C. Lower than

D. None of these

A. CO

B. None of these

D. H2

B. 29

C. 77

D. 79

B. Semi-bituminous coal

C. Anthracite

D. Bituminous coal

A. Lime and magnesia

C. Iron silicate

D. Iron sulphate

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

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

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

A. Sulphur

C. Hydrogen

D. Carbon

A. Gaseous

B. Solid

C. Liquid

B. 50

C. 5

D. 15

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

B. the ash

D. The ash retains the sulphur & phosphorus and thus affects the quality of products in

E. boiler tubes thereby reducing the heat transfer

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

A. Adsorbing on bog iron bed

B. None of these

C. Absorbing in vetro-coke solution

B. Is always positive

C. Cant be known without calculating it

D. Is equal to the heat of formation

A. Pitch-creosote mixture (PCM)

C. Benzol

D. Naphthalene

A. Volatile matter content

B. Moisture content

C. Ash content

A. Higher calorific value

B. Lower sulphur content

C. Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate

A. Protein is a natural polymer

C. Polythene is a copolymer, while SBR is a homopolymer

D. Polystyrene is a thermoplastic polymer

B. As an explosive

C. As a motor fuel

D. As a perfume

A. Abrasion index of the coke is a measure of its hardness

C. Reactivity of coke is inversely proportional to its absolute density

D. Cokes of high reactivity are obtained from weakly coking coals

B. Coke oven gas

C. Tar

D. Ammonia

A. Gobar gas

C. Natural gas

D. Carburetted water gas

A. 21% excess air has been used for combustion

C. 21% excess oxygen has been used for combustion

D. No excess air has been used for combustion

B. Have proper combustion by supplying it around the burner

C. Preheat the tertiary air used for complete combustion of CO to CO2

D. Burn CO to CO2

B. 4

C. 96

D. 40

B. Iron

C. Ash

D. Moisture

B. None of these

C. Coke oven gas

D. Blast furnace gas

A. Less moisture content

C. High bulk density

D. Lower ash content

A. Increases

C. Remain constant

D. Decreases

A. Anthracene & phenol

B. Tar & creosote

C. Ammonia & phenol

B. 32 kg

C. 1kg mole

D. 22.4 Nm3

B. None of these

C. High

D. Very high, if the fuel is of low calorific value

A. Coke oven gas yield on carbonisation

B. Smoking tendency on burning

C. Chance of catching fire during storage in open space

A. Temperature of the flue gas

B. Its height

D. Neither A. nor B.

A. CH4

B. CO

C. C2H6

A. Oxidation

B. Coalification

C. Carbonisation

A. 50

B. 500

D. 0.5

A. Yield of ammonia is less

B. Aromatic content of tar is low

D. Calorific value of the coke oven gas is lower

A. Reduces its consumption in the furnace

C. Decreases its hardness and abrasion resistance

D. Does not affect its consumption in the furnace

A. 9000

C. 4500

D. 500

B. In between 0 and 100

C. More than 100

D. 0

A. Erosion of induced draft fan blades

B. Excessive fly-ash discharge from the stack

C. High power consumption in its transportation

A. 1

B. 46

C. 7

A. 15-Oct

B. 30-33

D. 22-26

B. Higher calorific value

C. Narrower limit of inflammability

D. Lower ignition temperature