STOICHIOMETRY QUIZ

The fuel ratio of a coal is

The ratio of its percentage of fixed carbon to that of volatile matter

Helpful in estimation of its rank

Both A and B

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

Coking time in narrow by-product coke ovens is around __________ hours.

8

18

48

80

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised coal as compared to that of lump coal

Develops a non-luminous flame

Provides a lower rate of heat release

Can be done with less excess air

Develops a low temperature flame

TRUE ANSWER : ?
YOUR ANSWER : ?

During combustion of gaseous fuels, deficiency of air

Lengthens the flame

Does not affect the flame length

Tends to shorten the flame

Increases the flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

A sooty flame can be made non-luminous by

Shutting air supply

Admitting more gas

Shutting gas supply

Admitting more air

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in the oxygen content of the coal, its __________ decreases.

Neither A nor B

Both A & B

Caking power

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Weathering of coal during storage causes

Reduction in coal size

All of these

Decrease in its caking capacity

Increase in its friability

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen percentage (by weight) in atmospheric air is

23

21

29

19

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal does not reduce its

Fusion point of ash

None of these

S & P content

Heating value

TRUE ANSWER : ?
YOUR ANSWER : ?

Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

%of CO₂ in

Temperature of

Colour of

% of O₂in

TRUE ANSWER : ?
YOUR ANSWER : ?

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