Fuels and Combustion Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the Requirement of large volume combustion chamber Chances of clinker formation Incomplete combustion of coal Risk of explosion Requirement of large volume combustion chamber Chances of clinker formation Incomplete combustion of coal Risk of explosion ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Which of the following fuel gases has the highest calorific value ? Liquefied petroleum gas (LPG) Coal bed methane (CBM) Sewage gas Natural gas Liquefied petroleum gas (LPG) Coal bed methane (CBM) Sewage gas Natural gas ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Removal of hydrogen from coke oven gas Increases its calorific value Decreases its calorific value Does not alter its calorific value Is not possible on commerical scale Increases its calorific value Decreases its calorific value Does not alter its calorific value Is not possible on commerical scale ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion In low temperature carbonisation of coal, the Yield of tar is about 3% of dry coal Yield of coke oven gas is 290 Nm³ /ton dry coal Volatile matter in coke is zero Temperature maintained is 700°C Yield of tar is about 3% of dry coal Yield of coke oven gas is 290 Nm³ /ton dry coal Volatile matter in coke is zero Temperature maintained is 700°C ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if All of these It contains large amount of volatile matter Smaller fines are stored in large quantity It is stored in tall heaps All of these It contains large amount of volatile matter Smaller fines are stored in large quantity It is stored in tall heaps ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Atomising steam to fuel oil ratio in a burner should be around 1.5 0.5 3.5 2.5 1.5 0.5 3.5 2.5 ANSWER DOWNLOAD EXAMIANS APP
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