B. Emissivity of the refractory walls

C. Thickness of the stock

D. Size of the furnace

A. Surface area & emissivity of the stock

B. Properties of the muffle wall (temperature, area, and emissivity)

D. Neither A. nor B.

A. Increase in flame temperature

C. Saving in fuel consumption

D. Reduction in scale losses

A. 85

B. 15

D. 70

A. Soaking pits

C. Beehive coke oven

D. Blast furnace stoves

A. Coke oven heating chamber

B. Rotary kilns

D. Blast furnace

B. 250

C. 80

D. 180

A. Soaking pit

C. Open hearth

D. Walking beam reheating

A. Resistance

B. Arc

C. Low frequency induction

A. 20

B. 60

D. 40

A. Use of pulverised solid fuels

C. Use of excessive positive draft in the furnace

D. Use of non-preheated combustion air

A. Fuel gas pressure

B. Air pressure

C. Speed of I.D. fan

A. Oxygen enrichment of combustion air

B. Preheating the combustion air

D. Preheating the fuel gas

A. 50

B. 100

D. 250

A. Thermal conductivity of the charge & structural materials of furnace

B. Rate of firing and emissivity of flame

C. Nature of process; whether batch, continuous or intermittent

B. Transportation of coal

C. Preheating the primary air

D. Drying of coal

B. Rotary kilns

C. Reheating furnace

D. Reverberatory furnace

A. Change in volume during a change of temperature

C. Furnace pressure in conjunction with draft in flues

D. Difference in density between hot and cold gases

B. Thoria

C. Graphite powder

D. Beryllium

A. Temperature

C. Time

D. Nature of atmosphere

A. Glass melting furnace

C. By product coke ovens

D. Open hearth furnace

A. Fire tube

B. Water tube

C. Waste heat

A. None of these

B. Updraft kiln

C. Continuous furnace

A. Either more or less; depends on the flue gas density

B. Same

C. More

A. Annealing furnace

B. Steam boiler

D. Blast furnace

A. None of these

B. Glass tank furnace

D. Reheating furnace

A. 45-50

B. 65-70

C. 15-Oct

B. Soaking pit

C. Reheating furnace

D. Steam boiler

B. Increase in flame temperature

C. Reduction in scale losses

D. Saving in fuel consumption

A. None of these

B. Regenerator

D. Metallic recuperator

A. Preheat temperature of fuel & air

B. Method of mixing the fuel & air

C. Heat release rate of the fuel

A. Open hearth furnace

B. Soaking pit

C. Cupola

A. Calcination kiln

B. L.D. converter

D. Soaking pit

A. Diffusion

B. Rotary

C. Outside mixing type

B. Protection of the periphery of the charge from excessive radiation

C. Elimination of cold spot at the bottom of the charge

D. Reduction in the temperature of furnace gases

A. Horizontal

B. Vertical

D. Tangential

A. Muffle furnace

C. Rotary kiln

D. Reheating furnace

A. Combustion air not enriched with oxygen

C. Recuperators

D. Non-preheated combustion air

B. None of these

C. Radiation

D. Convection

A. Walking beam reheating furnace

B. Soaking pits

C. Rotary kilns

B. Cannot be predicted

C. Convection

D. Conduction

A. Beehive coke oven

C. Blast furnace stoves

D. Coke oven

A. Using oxygen enriched combustion air

B. Reducing the heat loss through furnace openings & doors

D. Preheating the combustion air

A. 850

B. 250

C. 1000

A. 1250

B. 1050

C. 350

A. Batch furnace

B. Tunnel Kiln

C. Natural draft furnace

A. Thickness of heating stock

C. Thermal conductivity of stock

D. Temperature of flue gas

A. Hood annealing furnace

B. Muffle furnace

D. Neither A. nor B.

B. 65

C. 10

D. 25

A. Electric arc struck between electrodes and the charge

B. Combination of induced current and skin effect

C. None of these