Fuels and Combustion MCQs

Question 1

With increase in moisture content of coal, its

Accepted Answer

None of these

Answer

Calorific value increases sometimes

Answer

Bulk density always decreases

Answer

Clinkering tendency during combustion increases

Question 2

Gray King Assay and Swelling Index of a coal is a measure of its

Accepted Answer

Swelling characteristics

Answer

Abradability

Answer

Agglutinating properties

Answer

Resistance to impact breakage

Question 3

Caking index of a coal is a measure of its

Accepted Answer

Agglutinating (binding) properties

Answer

Abradability

Answer

Reactivity

Answer

Porosity

Question 4

Micum Index of a coke is a measure of its

Accepted Answer

Hardness & strength

Answer

Reactivity

Answer

Porosity

Answer

Bulk density

Question 5

Weathering of coal during storage causes

Accepted Answer

All of the above

Answer

Reduction in coal size

Answer

Increase in its friability

Answer

Decrease in its caking capacity

Question 6

Low temperature oxidation of coal is accelerated by the

Accepted Answer

Storage in large heaps

Answer

Storage in compressed piles

Answer

Absence of porous or friable particles

Answer

All of the above

Question 7

Washing of coal is done to reduce the

Accepted Answer

Both B and C

Answer

Inherent impurities

Answer

Adhering impurities

Answer

Mineral matter

Question 8

Low temperature oxidation of stored coal results in the

Accepted Answer

All of the above

Answer

Decrease in its caking power & calorific value

Answer

Decrease in its carbon & hydrogen content

Answer

Increase in its oxygen content

Question 9

Adiabatic flame temperature of a fuel is dependent on the initial temperature of

Accepted Answer

Both A & B

Answer

Fuel

Answer

Air

Answer

Neither A nor B