FUELS AND COMBUSTION QUIZ

Naphthalene is removed from coke oven gas by

Scrubbing with wash oil (a petroleum product)

Adsorbing on bog iron bed

Absorbing in vetro-coke solution

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of nitrogen in blast furnace gas may be around

55

25

80

5

TRUE ANSWER : ?
YOUR ANSWER : ?

Coking coals are invariably

Bituminous coals

Semi-anthracites

Anthracites

Lignites

TRUE ANSWER : ?
YOUR ANSWER : ?

With increases in carbonisation temperature

Tar yield increases

Hydrogen percentage in the coke oven gas decreases

Coke even gas yield increases

Methane percentage in the coke oven gas increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Mott and Wheeler test is conducted on coke to find its

Phosphorus content

Reactivity with O₂

Volatile matter content

Abradability

TRUE ANSWER : ?
YOUR ANSWER : ?

Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1250

1400

1100

1350

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised fuel

Suppresses the discharge of fine dust and grit into atmosphere

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

All of these

Requires larger combustion chamber than rich gaseous fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

Large heaps with small surface to volume ratio

Closed space without any ventilation facility

Shallow and small piles

Fine sizes without the presence of any lump

TRUE ANSWER : ?
YOUR ANSWER : ?

Main constituent of natural gas is

C₃H₈

C₂H₆

H₂

CH₄ (upto 90%)

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?

Benzol

Pitch-cresosote mixture (PCM)

Ethylene

Napthalene

TRUE ANSWER : ?
YOUR ANSWER : ?