Coke made in narrower by-product coke ovens (as compared to wider ovens) is All of these Less reactive Smaller in size Stronger TRUE ANSWER : ? YOUR ANSWER : ?
A coal containing very high percentage of durain is called __________ coal. Boghead Non-banded Bright Splint TRUE ANSWER : ? YOUR ANSWER : ?
Volatile matter content of metallurgical coke may be around __________ percent. 1-2 10-15 22-26 30-33 TRUE ANSWER : ? YOUR ANSWER : ?
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because It reduces its flame temperature tremendously It reduces its calorific value tremendously There are chances of explosion during preheating The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot TRUE ANSWER : ? YOUR ANSWER : ?
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis. 750 1150 950 550 TRUE ANSWER : ? YOUR ANSWER : ?
Preheating of combustion air is done to Reduce its requirement for effecting the complete combustion Increase the adiabatic flame temperature Complete the combustion of fuel Increase the calorific value of the fuel TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following has the highest heat of combustion? CO H₂ C₂H₆ CH₄ TRUE ANSWER : ? YOUR ANSWER : ?
Presence of nitrogen in combustion air does not reduce the Amount of heat liberated Any of the above Flue gas temperature Flame temperature TRUE ANSWER : ? YOUR ANSWER : ?
The fuel ratio of a coal is Helpful in estimation of its rank Both A and B Neither A nor B The ratio of its percentage of fixed carbon to that of volatile matter TRUE ANSWER : ? YOUR ANSWER : ?
Efficient burning of anthracite coal requires All of these Fine grinding Low preheat of air High excess air TRUE ANSWER : ? YOUR ANSWER : ?