FUELS AND COMBUSTION QUIZ

The internal energy of the combustion products is __________ compared to that of reactants.

Less

More

Equal

More or less ; (depends on the state of fuel.)

TRUE ANSWER : ?
YOUR ANSWER : ?

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

In between 37 & 71%

>71%

< 37%

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Compound coke ovens are those which can be heated by

Both B and C

Both steam and electrical power

Lean gas (e.g., B.F. gas)

Rich gas (e.g., coke oven gas)

TRUE ANSWER : ?
YOUR ANSWER : ?

Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the

Decolourisation of sugar

Absorption of gases and vapor

Solvent recovery from air and gases

Electrode manufacture

TRUE ANSWER : ?
YOUR ANSWER : ?

Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.

2000

300

5000

10000

TRUE ANSWER : ?
YOUR ANSWER : ?

High ash containing coke

None of these

Has poor strength and abrasion resistance

Produces more slag when used in the blast furnace

Is desirable in producer gas manufacture

TRUE ANSWER : ?
YOUR ANSWER : ?

The pyragallol solution used in orsat apparatus can absorb

Both O₂ and CO₂

Both O₂ and CO

Only O₂

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Naphthalene is used for making

Unsaturated polyesters

Insecticides (e.g. moth balls)

All of these

Drug intermediates e.g. β-naphthol

TRUE ANSWER : ?
YOUR ANSWER : ?

Softening temperature of coal ash is a measure of the __________ of coal.

Clinkering tendency

Caking tendency

Size stability

Coking tendency

TRUE ANSWER : ?
YOUR ANSWER : ?

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will

Increase

Decrease

Increase or decrease depending on the fuel type

Not change

TRUE ANSWER : ?
YOUR ANSWER : ?

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