A coal having high volatile matter content will Burn with a small non-smoky flame Have a very high calorific value Give less yield of tar and gas on carbonisation None of these TRUE ANSWER : ? YOUR ANSWER : ?
During its calorific value determination by bomb calorimeter, coal is combusted by Air Oxygen enriched air Oxygen None of these TRUE ANSWER : ? YOUR ANSWER : ?
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of Water gas Coke oven gas Blast furnace gas Natural gas TRUE ANSWER : ? YOUR ANSWER : ?
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C. 180 65 120 30 TRUE ANSWER : ? YOUR ANSWER : ?
Presence of free moisture in coal during its high temperature carbonisation Increases the loss of fine coal dust from the ovens when charging Reduces the coking time Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls None of these TRUE ANSWER : ? YOUR ANSWER : ?
Coalification means the Complete combustion of coal Process of conversion of lignite into anthracite Direct hydrogenation of coal Underground gasification of coal TRUE ANSWER : ? YOUR ANSWER : ?
Preheating of coal charge for the coke ovens reduces the Time of carbonisation Fuel consumption in coking Yield of gas and tar All of these TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ? Bag filter Hydrocyclones Wet scrubber Multicyclones TRUE ANSWER : ? YOUR ANSWER : ?
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass. Electrical resistivity None of these Density Porosity TRUE ANSWER : ? YOUR ANSWER : ?