Which of the following coal gasification processes will produce gas having maximum methane content? Winkler process Kopper-Totzek process All of these Lurgi process TRUE ANSWER : ? YOUR ANSWER : ?
Stack heat losses can be minimised by Maintaining proper draft in the furnace Using low c.v. fuels Oxygen enrichment of combustion air Controlling the excess air TRUE ANSWER : ? YOUR ANSWER : ?
Spontaneous combustion of coal on storage results due to Inadequate ventilation Low temperature oxidation Storage in large heaps with small surface to volume ratio All of these TRUE ANSWER : ? YOUR ANSWER : ?
In Lurgi coal gasifier, Larger quantity of coal can be processed Coking coals cannot be used Low carbon conversion efficiency is achieved Entrainment of solids is higher TRUE ANSWER : ? YOUR ANSWER : ?
During coking of coal, the ash content (percentage) None of these Decreases Increases Remains constant TRUE ANSWER : ? YOUR ANSWER : ?
Pick out the wrong statement. Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel None of these Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing TRUE ANSWER : ? YOUR ANSWER : ?
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use. 15-30 43832 70-100 150-200 TRUE ANSWER : ? YOUR ANSWER : ?
Ratio of primary air to secondary air increases with increase in the rank of coal, because the Oxygen content progressively decreases Ratio of fixed carbon to volatile matter increases Calorific value of the coal increases High rank coals have higher amount of volatile matter TRUE ANSWER : ? YOUR ANSWER : ?
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is H₂ N₂ CO₂ CH₄ TRUE ANSWER : ? YOUR ANSWER : ?
A particular coal is said to be free burning when it Burns completely None of these Gives smokeless burning Shows little or no fusing action TRUE ANSWER : ? YOUR ANSWER : ?