Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if It contains large amount of volatile matter Smaller fines are stored in large quantity All of these It is stored in tall heaps TRUE ANSWER : ? YOUR ANSWER : ?
Spontaneous combustion of coal on storage results due to All of these Low temperature oxidation Storage in large heaps with small surface to volume ratio Inadequate ventilation TRUE ANSWER : ? YOUR ANSWER : ?
A fuel with high heat release rate will None of these Require smaller combustion chamber Have high calorific value Have high adiabatic flame temperature TRUE ANSWER : ? YOUR ANSWER : ?
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C. 100 to 150 550 to 650 700 to 850 350 to 450 TRUE ANSWER : ? YOUR ANSWER : ?
'Wobbe index' is a characteristic of Solid fuels Fat coals Liquid fuels Gaseous fuels TRUE ANSWER : ? YOUR ANSWER : ?
Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³. 1.75 11.4 2.4 0.87 TRUE ANSWER : ? YOUR ANSWER : ?
The gas which contributes maximum to the heating value of natural gas is H₂ CO CO₂ CH₄ TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is called "blue gas"? Producer gas Coke oven gas Natural gas Water gas TRUE ANSWER : ? YOUR ANSWER : ?
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about 8800 kcal/kg 25000 kcal/kg 8800 kcal/m³ Same as that of coal middling TRUE ANSWER : ? YOUR ANSWER : ?
__________ prohibits the use of alcohols directly in petrol engines. Low flash point High cost & availability Low octane number Low calorific value TRUE ANSWER : ? YOUR ANSWER : ?