B. 45

C. 60

D. 80

A. 1600

B. 2000

C. 600

A. 10

B. 100

C. 500

A. Coal cant be pulverised

B. Coal can be pulverised with great difficulty

D. Power consumption in grinding the coal will be very high

B. Graphite

C. Zirconia

D. Alumina

A. Provides a lower rate of heat release

B. Develops a low temperature flame

C. Develops a non-luminous flame

B. No by-products

C. Metallurgical coke

D. Very low calorific value coke oven gas

B. None of these

C. Produce larger quantity of coke oven gas

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

A. Bottom hearth of reheating furnace

B. Burning zone of limestone rotary kilns

D. Hearth of soaking pits

B. Rotary kilns

C. Sun

D. None of these

B. 2400

C. 1800

D. 2200

A. 35

B. 55

C. 5

B. Increase or decrease depending on the fuel type

C. Not change

D. Increase

A. Orton cones

B. Segar cones

C. Ovens & retorts

A. None of these

B. Strength

C. Hardness

A. Humidity of combustion air

B. Moisture content of fuel

D. The water formed by combustion reaction

B. Hardness & strength

C. Fusion point of its ash

D. Porosity

B. Electrical resistivity

C. Porosity

D. None of these

A. Ash fusion temperature

B. Calorific value

C. Caking index

B. Pulverised coal

C. Coke oven gas

D. Furnace oil

A. Sewage gas

B. Producer gas

C. Natural gas

A. Requires smaller combustion space and less secondary air

B. Is more difficult to ignite and produces a shorter flame

D. Is less liable to spontaneous combustion on storage

B. All A., B. and C.

C. Methane

D. Unsaturated hydrocarbons

B. None of these

C. Have high calorific value

D. Have high adiabatic flame temperature

A. The gaseous fuel before combustion decreases

B. Combustion air decreases

D. Either the fuel or the air does not affect

A. MgSO4 & BaCl2

B. MgCO3 & NaCl

D. BaSO4 & NaCl

B. Silica

C. Direct bonded basic

D. Magnesite

A. Maximum to minimum heat input ratio

B. Maximum to minimum permissible gas flow rate

D. Minimum to maximum heat input ratio

A. 12-Jul

B. 7-May

D. 3-Feb

A. CH4

B. CO2

C. S

A. Is non-coking, but when blended with highly coking coal, controls its swelling and produces

B. coal

C. h strength coke on carbonisation

E. Is friable, charcoal like substance

F. Has highest fixed carbon and lowest volatile matter content of all the four banded components

A. Low calorific value of the fuel

C. High sulphur content in the fuel

D. Presence of large quantity of hydrogen in the fuel

A. 80

B. 25

D. 5

B. Carbonisation

C. Gasification

D. None of these

B. None of these

C. Has poor strength and abrasion resistance

D. Is desirable in producer gas manufacture

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. Remain same

C. May increase or decrease; depends on the type of fuel

D. Increases

A. 3,200

C. 10,200

D. 1,800

A. Remains unchanged

C. Decreases linearly

D. Decreases

A. Stable form of silica upto 870C

C. Transformed to Cristobalite on heating above 1470C

D. Converted to Tridymite on firing between 870 to 1470C

A. Side wall of soaking pits

C. Walls of coke oven

D. Regenerators of coke oven

A. Silicon carbide

B. Thoria

D. Fireclay

A. Resistance to compressive loads

B. Resistance to chemical action of gases and molten fluxes

C. Softening

A. None of these

B. Pollution control aspect

D. Limitation of constructional facilities

A. Reheating furnace

B. Rotary lime kiln

D. Soaking pits

A. Coal

C. Natural gas

D. Kerosene

A. % of CO2 in

B. Temperature of

C. Colour of

A. Yield of ammonia present in coke oven gas

B. Free carbon content in tar

D. Yield percentage of coke

A. 11.4

B. 1.75

D. 0.87

B. Dolomite

C. Magnesite

D. Chrome magnesite