Question

A good quality coal should have 1.High moisture content 2. High ash content 3. High volatile content 4.High fixed carbon

Answer 1

3. should have high volatile content

Answer 2

Answer:

A correct answer is an option (d) high fixed carbon, a good quality coal should have high fixed carbon.

Explanation:

• High moisture content:- a high moisture content coal causes much weight to the coal and it leads to low combustion and lowers the rank of coal.

• High ash content:- the coal which has high ash content causes a low calorific value of coal, it also damages the health of living beings and the environment and decreases the boiler efficiency, in that way ash content is important to examine the coal’s purity and efficiency.

• High volatile content:- A good quality coal needs low volatile contents, coal rank is directly related to volatile content, the lower the volatile content higher the coal rank, volatile contents are water, sulfur dioxide, and carbon dioxide.

• High fixed carbon:- high fixed carbon is the indication of good quality coal, it actually signifies the parts of coal that actually burn, it partially contains hydrogen, carbon, nitrogen, and sulfur which were not come out after the complete coal burns off. it is generally defined by deducting the moisture, volatile content, and ash content from a lump of coal.

Therefore,

                option (d) high fixed carbon is the correct answer.