FUELS AND COMBUSTION QUIZ

C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

May increase or decrease, depends on combustibles

Increases

Decreases

Remains constant

TRUE ANSWER : ?
YOUR ANSWER : ?

Coking coals are invariably

Bituminous coals

Lignites

Semi-anthracites

Anthracites

TRUE ANSWER : ?
YOUR ANSWER : ?

Highly reactive coke have lower

Critical air blast (CAB) value

Porosity

Both B and C

Coke reactivity index (CRI)

TRUE ANSWER : ?
YOUR ANSWER : ?

By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

Ammonia

None of these

Benzol

Tar

TRUE ANSWER : ?
YOUR ANSWER : ?

Abrasion index of blast furnace coke should be around __________ percent.

35

80

20

55

TRUE ANSWER : ?
YOUR ANSWER : ?

Shatter index of the coke is a measure of its

None of these

Reactivity

Bulk density

Strength

TRUE ANSWER : ?
YOUR ANSWER : ?

Sometimes water is sprayed during coal charging in the coke oven, which helps in

Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)

All of these

Controlling the dust nuisance while charging the coal

Prevention of clinker formation in the oven

TRUE ANSWER : ?
YOUR ANSWER : ?

Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.

Fixed

Moving

Entrained

Fluidised

TRUE ANSWER : ?
YOUR ANSWER : ?

Benzol is used

Neither A nor B

For producing benzene, tolune & xylene by its distillation

Both A & B

As a motor fuel blend

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?

Water gas

Natural gas

Blast furnace gas

Producer gas

TRUE ANSWER : ?
YOUR ANSWER : ?