FUELS AND COMBUSTION QUIZ

Which of the following is a measure of the agglutinating (i.e., binding) property of coal?

Swelling index

Gray-king index

Thickness of plastic layer

Caking index

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of tar is about __________ Kcal/kg.

12000

16000

5000

8800

TRUE ANSWER : ?
YOUR ANSWER : ?

Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.

0.87

11.4

1.75

2.4

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the least calorific value (kcal/Nm³) ?

Natural gas

Blast furnace gas

Coke oven gas

Sewage gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Coking time in beehive coke oven is about

2-3 days

One week

Two weeks

12 hours

TRUE ANSWER : ?
YOUR ANSWER : ?

In flue gas analysis by Orsat's apparatus, oxygen is absorbed by

Alkaline pyragllol solution

None of these

Potassium hydroxide

Cuprous chloride

TRUE ANSWER : ?
YOUR ANSWER : ?

Overfire burning in a furnace is a phenomenon characterised by the

None of these

Supply of excess air

Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air

Supply of excess fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Natural draught produced by a chimney depends upon the

Height of the chimney

Neither A nor B

Both A & B

Density of the chimney gases

TRUE ANSWER : ?
YOUR ANSWER : ?

Gross and net calorific value of a fuel will be the same

Ifits carbon content is very low

If its ash content is zero

If its hydrogen/hydrogen compound content is zero

Under no circumstances

TRUE ANSWER : ?
YOUR ANSWER : ?

A particular coal is said to be free burning when it

Burns completely

Gives smokeless burning

Shows little or no fusing action

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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