FUELS AND COMBUSTION QUIZ

Quantity of coke produced from metallurgical coal may be around __________ percent.

50

30

95

75

TRUE ANSWER : ?
YOUR ANSWER : ?

If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as

N₂

SO₂

CO

O₂

TRUE ANSWER : ?
YOUR ANSWER : ?

As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

Increases

Decreases

May increase or decrease depending on the type of fuel

Remains same

TRUE ANSWER : ?
YOUR ANSWER : ?

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

1000

10000

50

5000

TRUE ANSWER : ?
YOUR ANSWER : ?

Purity of coke means that, it is high in carbon and low in

Volatiles

Moisture

Iron

Ash

TRUE ANSWER : ?
YOUR ANSWER : ?

A fuel with high heat release rate will

Have high adiabatic flame temperature

Have high calorific value

Require smaller combustion chamber

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Under pressurising

Back draughting

Banking

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The calorific value is the highest out of the following for

Producer gas

Water gas

Blast furnace gas

Coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Overfire burning in a furnace is a phenomenon characterised by the

None of these

Supply of excess fuel

Supply of excess air

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

TRUE ANSWER : ?
YOUR ANSWER : ?

The gas which contributes maximum to the heating value of natural gas is

CO₂

CH₄

CO

H₂

TRUE ANSWER : ?
YOUR ANSWER : ?