FUELS AND COMBUSTION QUIZ

Nitrogen in coal

All of these

Comes from protein in parent vegetable matter

Is recovered as ammonia during its carbonisation

Is present upto 1-2%

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.

6000

8000

1000

4000

TRUE ANSWER : ?
YOUR ANSWER : ?

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

1700-1800

1400-1500

900-1000

400-500

TRUE ANSWER : ?
YOUR ANSWER : ?

Pulverised coal used in boiler firing need not have

Less moisture content

High bulk density

High fusion point of its ash

Lower ash content

TRUE ANSWER : ?
YOUR ANSWER : ?

Higher percentage of ash in coal meant for the production of metallurgical grade coke

None of these

Decreases the hardness of coke

Decreases the abrasion resistance of coke

Causes brittleness in steel

TRUE ANSWER : ?
YOUR ANSWER : ?

If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be

Very high, if the fuel is of low calorific value

None of these

High

Low

TRUE ANSWER : ?
YOUR ANSWER : ?

Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

Back draughting

None of these

Banking

Under pressurising

TRUE ANSWER : ?
YOUR ANSWER : ?

Stack heat losses can be minimised by

Controlling the excess air

Using low c.v. fuels

Maintaining proper draft in the furnace

Oxygen enrichment of combustion air

TRUE ANSWER : ?
YOUR ANSWER : ?

Air/gas ratio for complete combustion will be the highest for

LPG

Coke oven gas

Gobar gas

Carburetted water gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

All of these

It is stored in tall heaps

It contains large amount of volatile matter

Smaller fines are stored in large quantity

TRUE ANSWER : ?
YOUR ANSWER : ?

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