Fuels And Combustion - Practice Test

[#281] Sometimes water is sprayed during coal charging in the coke oven, which helps in

(A) Prevention of clinker formation in the oven

(B) Controlling the dust nuisance while charging the coal

(C) Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H 2 in the gas (due to the endothermic reaction represented by C + H 2 O = CO + H 2 )

(D) All of the above

Correct Answer

(D) All of the above

[#282] The main drawback of supplying more excess air in the combustion of fuel is the

(A) Excessive power requirement of air blower

(B) Enhanced sensible heat loss in the flue gas

(C) Intermittant and uncontrolled combustion of the fuel

(D) High exit flue gas temperature from the furnace

Correct Answer

(B) Enhanced sensible heat loss in the flue gas

[#283] Which of the following fuel gases has the highest calorific value ?

(A) Natural gas

(B) Coal bed methane (CBM)

(C) Liquefied petroleum gas (LPG)

(D) Sewage gas

Correct Answer

(C) Liquefied petroleum gas (LPG)

[#284] Which of the following has the highest calorific value?

(A) Lignite

(B) Sub-bituminous coal

(C) Anthracite

(D) Peat

Correct Answer

(C) Anthracite

[#285] Which of the following coke has the least percentage of ash?

(A) Petroleum coke

(B) Beehive coke

(C) Foundary coke

(D) Metallurgical coke

Correct Answer

(A) Petroleum coke

Fuels And Combustion - Study Mode

[#281] Sometimes water is sprayed during coal charging in the coke oven, which helps in

Correct Answer

[#282] The main drawback of supplying more excess air in the combustion of fuel is the

Correct Answer

[#283] Which of the following fuel gases has the highest calorific value ?

Correct Answer

[#284] Which of the following has the highest calorific value?

Correct Answer

[#285] Which of the following coke has the least percentage of ash?

Correct Answer