During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass. Porosity Density None of these Electrical resistivity TRUE ANSWER : ? YOUR ANSWER : ?
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has Lower hydrogen content Higher calorific value Neither A nor B Both A & B TRUE ANSWER : ? YOUR ANSWER : ?
Preheating of combustion air is done to Complete the combustion of fuel Increase the adiabatic flame temperature Increase the calorific value of the fuel Reduce its requirement for effecting the complete combustion TRUE ANSWER : ? YOUR ANSWER : ?
Grindability index of a coal is 100. It implies that the Coal can be easily pulverised Coal can be pulverised with great difficulty Power consumption in grinding the coal will be very high Coal can't be pulverised TRUE ANSWER : ? YOUR ANSWER : ?
The function of secondary combustion air is to Pneumatically convey the pulverised coal None of these Completely burn the volatile matter Burn the lumpy coal TRUE ANSWER : ? YOUR ANSWER : ?
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced. Ash content Colour Moisture content Volatile matter TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature? Flame temperature achieved Heat transfer rate to the stock in the furnace Calorific value of the fuel Speed of combustion of fuel TRUE ANSWER : ? YOUR ANSWER : ?
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of Too much air for combustion Correct amount of air for combustion Less air for combustion Pulverised coal in boilers TRUE ANSWER : ? YOUR ANSWER : ?
For long flame and easy ignition, the coal used should have High calorific value High ash Low ash High volatile matter TRUE ANSWER : ? YOUR ANSWER : ?