FUELS AND COMBUSTION QUIZ

The calorific value is the highest out of the following for

Water gas

Producer gas

Blast furnace gas

Coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

'Wobbe index' is a characteristic of

Fat coals

Gaseous fuels

Liquid fuels

Solid fuels

TRUE ANSWER : ?
YOUR ANSWER : ?

'Mixed gas' used in steel plants is a mixture of

Coke oven gas and L.P.G

F. gas and coke oven gas

Coke oven gas and converter gas

Blast furnace gas and naphtha vapor

TRUE ANSWER : ?
YOUR ANSWER : ?

Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

Requirement of large volume combustion chamber

Chances of clinker formation

Risk of explosion

Incomplete combustion of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³.

10, 000

5000

25, 000

15, 000

TRUE ANSWER : ?
YOUR ANSWER : ?

Gobar gas is produced by the __________ of 'gobar' (cow dung).

Hydrolysis

Fermentation

Oxidation

Dehydration

TRUE ANSWER : ?
YOUR ANSWER : ?

The optimum percentage of excess air for combustion depends upon the __________ of the fuel.

Calorific value

Type (solid, liquid or gaseous)

Ignition temperature

Sulphur content

TRUE ANSWER : ?
YOUR ANSWER : ?

Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

50

10000

5000

1000

TRUE ANSWER : ?
YOUR ANSWER : ?

Beehive coke oven

Gives larger yield of coke (around 85%) as compared to by-product ovens

Produces coke with very poor strength

Facilitates by-products recovery

Takes 2-3 days for coking of coal but requires no external fuel for heating

TRUE ANSWER : ?
YOUR ANSWER : ?

Mineral matter content (M) and ash content (A) in coal are approximately related as

M = A

M = 2A

M = 1.5A

M = 1.1A

TRUE ANSWER : ?
YOUR ANSWER : ?

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