This set of Energy Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Fuel Handling System, Storage of Coal”.
1. How is the fuel handled generally outside the plant?
c) Robotic technology
Explanation: It is absolutely essential to have an efficient fuel handling system in power plants. Since majority of the plants operate using coal as a fuel, it is necessary to study about coal handling system. Coal can be handled either manually or mechanically. But, citing the capacity of modern power plants it is almost impossible to handle coal manually. That means mechanical handling of coal is inevitable.
2. Why is fuel need to be stocked in steam power plant?
a) To supply to nearby other steam plants
b) For overusing when plant is run for extra periods
c) For emergency possible cases
d) For Non-stop work of power plant
Explanation: With more and more number of commissioning of large capacity steam power plants, it is very essential to have an effective means of transporting coal from coal mines to the plant site and subsequently store it to meet the emergencies.
3. What is the ideal site for power plant?
a) In hilly regions
b) On islands
c) Near water resources
d) In center lands
Explanation: An ideal site for power plant is near water source. If the plant is situated near the sea or river, coal can be economically transported in bulk quantity by ships or boats or barges. After unloading the coal by mechanical means, coal is either stored in the plants site or conveyed to the plant.
4. Which type of transportation system is ideal for transporting coal directly to the point of consumption?
a) Road transportation
b) Sea or river transportation
c) Transportation by rail
d) Transportation by air
Explanation: Road transportation is ideal for transporting coal directly to the point of consumption. Such a means is suitable for supplying coal to a small capacity plant. Trucks or tippers are used to supply coal for this purpose.
5. What is in plant coal handling system?
a) Maintenance of coal during emergencies
b) Maintenance of coal inside the boiler
c) Maintenance of coal inside the power production area
d) Maintenance of coal while transporting/moving it
Explanation: For easy, smooth and rapid operation mechanical handling system is embraced for inplant handling of coal. Inplant handling begins right from the coal delivery point unto the furnace firing system.
6. What is the main characteristic of in plant coal handling system?
a) It should be easy to handle
b) Should be simple in construction
c) Free from repetitive handling
d) Free from corrosion problems
Explanation: It should have minimum handling operations and should be free from repetitive handling. For easy inspection and maintenance it should have centralized handling units. Its capacity should be well above the requirement of coal during peak hours.
7. Why is it necessary to have a coal storage yard near the plant?
a) To supply to other nearby power plants
b) To cut down on varying transportation rates
c) To face any emergencies
d) Due to higher rate of deterioration due to reduction
Explanation: To meet the continuous demand of coal and to face any emergencies due to the short supply of coal, it is always desirable to have a coal storage yard near the plant. Capacity of such yard would be about 10% of annual consumption to a maximum of 25% of annual consumption.
8. Where should coal be dumped?
a) On solid ground
b) In the water
c) By mixing with other form of fuels
d) Near the plant
Explanation: Coal should be dumped on a solid ground completely free from standing water. It should be protected from direct sunlight preferably and should be done so in order to reduce chances of oxidation and combustion.
9. What is the advantage of stocking the coal in huge heaps?
a) Prevents from coal being oxidized
b) Provides grip for the storage
c) Prevents air circulation in the interior of heap
d) The moisture content will be eliminated
Explanation: Coal is piled in heaps of 10 to 12m height on a concrete floor, by compacting it in the layers of 20 to 30cm thickness using bulldozers. This prevents air circulation in the interior of the heap. The heap top is given a gentle slope to drain off rain water immediately without washing the coal.
10. How the oxidation of coal is eliminated?
a) By exposing it to the sunlight
b) By turning the entire coal heap upside down periodically
c) By circulating air uniformly
d) By burning coal at very high temperatures
Explanation: The heat of oxidation is removed by circulating air uniformly through layers. Air thus circulated carries away the excess heat, maintaining coal below its combustion temperature of 343K. Oxidation can also be avoided by sealing the coal heap asphalt, fine coal dust or bituminous powder.
11. Why is it necessary to use noncandescent materials in place of coal storage area?
a) To avoid it from catching fire
b) To act as a fire resistor during the cause of fire
c) To avoid it from acting as a supporter of fire
d) To provide a cool environment
Explanation: Coal is susceptible to spontaneous combustion due to heating during natural oxidation of new coal surfaces. Second, coal dust is highly combustible and explosion hazard. If a coal dust cloud is generated inside an enclosed space, and an ignition source is present, an explosion can ensure.
Sanfoundry Global Education & Learning Series – Energy Engineering.
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