The calorific value is the highest out of the following for Water gas Producer gas Blast furnace gas Coke oven gas TRUE ANSWER : ? YOUR ANSWER : ?
'Wobbe index' is a characteristic of Fat coals Gaseous fuels Liquid fuels Solid fuels TRUE ANSWER : ? YOUR ANSWER : ?
'Mixed gas' used in steel plants is a mixture of Coke oven gas and L.P.G F. gas and coke oven gas Coke oven gas and converter gas Blast furnace gas and naphtha vapor TRUE ANSWER : ? YOUR ANSWER : ?
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 Risk of explosion Incomplete combustion of coal TRUE ANSWER : ? YOUR ANSWER : ?
The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³. 10, 000 5000 25, 000 15, 000 TRUE ANSWER : ? YOUR ANSWER : ?
Gobar gas is produced by the __________ of 'gobar' (cow dung). Hydrolysis Fermentation Oxidation Dehydration TRUE ANSWER : ? YOUR ANSWER : ?
The optimum percentage of excess air for combustion depends upon the __________ of the fuel. Calorific value Type (solid, liquid or gaseous) Ignition temperature Sulphur content TRUE ANSWER : ? YOUR ANSWER : ?
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm. 50 10000 5000 1000 TRUE ANSWER : ? YOUR ANSWER : ?
Beehive coke oven Gives larger yield of coke (around 85%) as compared to by-product ovens Produces coke with very poor strength Facilitates by-products recovery Takes 2-3 days for coking of coal but requires no external fuel for heating TRUE ANSWER : ? YOUR ANSWER : ?
Mineral matter content (M) and ash content (A) in coal are approximately related as M = A M = 2A M = 1.5A M = 1.1A TRUE ANSWER : ? YOUR ANSWER : ?