Coal Handling and ASH Handling Multiple Choice Questions and Answers
Coal Handling and ASH Handling Multiple Choice Questions and Answers
Cool and Ash Handling System MCQ
1. When coal is being burnt how much % of ash is formed compared to the whole amount?
a) 10-20%
b) 40-50%
c) 25-35%
d) 4-10%
Answer: 10-20%
2. The coal is fed to the furnace through _________
a) conveyor belt
b) wagon tipper
c) hopper
d) crane
Answer: hopper
3. Why is it important to prefer ash handling systems?
a) Coal ash produced destroys the machinery by entering into them
b) Coal ash produced annually accounts for thousands of tones
c) Coal ash can be reutilized for some other purpose
d) Coal ash affects the health of people working at plants
Answer: Coal ash produced annually accounts for thousands of tones
4. What is the role of breaker house in coal feeding?
a) To break the coal into smaller pieces
b) To separate different sizes of coal
c) To separate the light dust from the coal
d) To powder the coal
Answer: To separate the light dust from the coal
5. Large amount of coal is transported by ________
a) railway
b) sea or river ways
c) road transportation
d) by airlifting
Answer: railway
6. What is the capacity of low pressure hydraulic ash handling system?
a) 80 tonnes/hour
b) 22 tonnes/hour
c) 50 tonnes/hour
d) 10 tonnes/hour
Answer: 50 tonnes/hour
7. What is the capacity of the steam jet ash handling system?
a) 45tonnes/hour
b) 15tonnes/hour
c) 30tonnes/hour
d) 150tonnes/hour
Answer: 15tonnes/hour
8. What would be the amount of distance that a low pressure system could carry the ash?
a) 25m
b) 500m
c) 150m
d) 800m
Answer: 500m
9. What is the distance up to which steam jet ash handling system is capable of removing ashes?
a) 200m
b) 50m
c) 75m
d) 350m
Answer: 200m
10. How much amount of steam is required to remove 1 ton of ash from the steam jet ash handling system?
a) 100kg
b) 450kg
c) 65kg
d) 200kg
Answer: 100kg
11. Which system consumes less power out of all ash handling systems?
a) Mechanical ash handling system
b) Pneumatic ash handling system
c) Hydraulic ash handling system
d) Steam jet ash handling system
Answer: Mechanical ash handling system
12. Which of the following ash handling system is more suitable for large thermal plants?
a) Steam jet ash handling system
b) Mechanical ash handling system
c) Pneumatic ash handling system
d) Hydraulic ash handling system
Answer: Hydraulic ash handling system
13. What is the function of cyclone separators in pneumatic ash handling system?
a) To separate the lighter dust particles
b) To force up the movement of ash through pipes or tubes
c) To draw out the dust from furnace
d) To separate minute coal particles
Answer: To separate the lighter dust particles
14. What is the important feature of hydraulic ash handling system?
a) It is clean and dustless
b) It can discharge ash for long distances
c) The unhealthy aspect of ordinary ash basement work is eliminated
d) Absence of working parts in contact with ash
Answer: Absence of working parts in contact with ash
15. Which medium is used to carry ash in the pneumatic ash handling system?
a) Conveyor belt
b) Water trough
c) Air
d) Chain belt
Answer: Air
16. Which of the following ash is suitable for selling?
a) Bed ash
b) Synthetic gypsum
c) Fly ash
d) Clinkers
Answer: Fly ash
17. Which system is noisy out of all the following ash handling systems?
a) Steam jet ash handling system
b) Mechanical ash handling system
c) Pneumatic ash handling system
d) Hydraulic ash handling system
Answer: Pneumatic ash handling system
18. Which ash handling system can be built up in limited space?
a) Mechanical ash handling system
b) Pneumatic ash handling system
c) Hydraulic ash handling system
d) Steam jet ash handling system
Answer: Steam jet ash handling system
19. Which medium is used to carry ash in hydraulic system?
a) Air
b) Water
c) Steam
d) Conveyor
Answer: Water
20. What measure to be taken to avoid the noise produced in the pneumatic ash handling system?
a) Passing ash at slower pace
b) Reducing swift turns and sharp bends
c) Broadening of pipe width
d) Reducing and crushing the size of the ash
Answer: Reducing swift turns and sharp bends
21. _________ is used in high pressure hydraulic ash handling system, to quench the ash.
a) Turbines
b) Lubricants
c) Water troughs
d) Nozzle sprays
Answer: Nozzle sprays
22. In hydraulic ash handling system, large quantities of leachate under a positive pressure head in pond pose a constant threat to ________
a) cause pungent smell
b) the livelihood
c) ground water quality
d) the nearby flora
Answer: the livelihood
23. Which of the following ash handling system is not flexible to re-locate/re-place its discharging site?
a) Steam jet ash handling system
b) Mechanical ash handling system
c) Hydraulic ash handling system
d) Pneumatic ash handling system
Answer: Hydraulic ash handling system
24. ___________ and __________ are the common problems on pipeline inner walls when the slurry contains calcium, magnesium and sulphate ashes.
a) Clogs and Corrosion
b) Scaling and Cracks
c) Pores and Contamination
d) Scaling and Cementation
Answer: Scaling and Cementation
25. In what form does the total ash produced in the furnace escapes through the chimney?
a) Fines
b) Aerosols
c) Gas
d) Cinder
Answer: Fines
26. What material is used in pipe linings for linking of steam jet system?
a) Nickel alloy
b) Graphite
c) Titanium
d) Copper alloy
Answer: Nickel alloy
27. Scaling and __________ are the common problems on pipeline inner walls when the slurry contains calcium, magnesium and sulphate ashes.
a) Corrosion
b) Cracks
c) Contamination
d) Cementation
Answer: Scaling and Cementation
28. Is there any requirement of auxiliary steam producer in the steam jet ash handling system.
a) True
b) False
Answer: False
29. Nozzle sprays is used in high pressure hydraulic ash handling system
a) True
b) False
Answer: True
30. Hydraulic ash handling system consumes less power out of all ash handling systems
a) True
b) False
Answer: False
Ash and its Effects on Boiler Operation and Performance Multiple Choice Questions and Answers
1. How much amount of fly ash is made utilized by India?
a) 3 – 4%
b) 10 – 20%
c) 50 – 60%
d) 35 – 55%
Answer: 3 – 4%
2. What is the India’s current total capacity of power plants installed?
a) 84000MW
b) 92000MW
c) 28000MW
d) 150000MW
Answer: 84000MW
3. How much time period is fly ash stone powder cement bricks water cured?
a) A week
b) 2 weeks
c) 3 weeks
d) 1 month
Answer: 1 month
4. How much percent of fly ash is, mixed with Portland cement?
a) 10 to 25%
b) 5 to 10%
c) 30 to 50%
d) 50%
Answer: 10 to 25%
5. Ash is widely used in the production of _______
a) Plastics
b) Thermal wear
c) Food oxidants
d) Cement
Answer: Cement
6. Sintered light weight aggregates are produced by which method?
a) Nodulisation
b) Autolysation
c) Decondensation
d) Patronisation
Answer: Nodulisation
7. Which type of concrete is useful in high rise construction?
a) Cellular light weight concrete
b) Cast-in-situ fly ash
c) Fly ash stone powder bricks
d) Sintered light weight aggregates
Answer: Cellular light weight concrete
8. Why is used for treating acidic soils?
a) To improve fertility of soil
b) For their better alkali values
c) To keep away insects
d) To loosen up the soil
Answer: For their better alkali values
9. Which among the following when utilized gives good finishing on the both sides of the walls?
a) Cast-in-situ fly ash walls
b) Cellular light weight concrete
c) Sintered light weight aggregates
d) Fly ash cement putty
Answer: Cast-in-situ fly ash walls
10. Ash is widely used in the production of Food oxidants
a) True
b) False
Answer: False
Storage of Coal Multiple Choice Questions and Answers
1. 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
Answer: Maintenance of coal inside the power production area
2. What is the ideal site for power plant?
a) In hilly regions
b) On islands
c) Near water resources
d) In center lands
Answer: Near water resources
3. 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
Answer: Road transportation
4. 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
Answer: Free from repetitive handling
5. 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
Answer: To face any emergencies
6. 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
Answer: On solid ground
7. 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
Answer: Prevents air circulation in the interior of heap
8. 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
Answer: To avoid it from catching fire
9. 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
Answer: By circulating air uniformly
10. Sea or river type of transportation system is ideal for transporting coal directly to the point of consumption
a) True
b) False
Answer: False
Stages of Coal Handling Multiple Choice Questions and Answers
1. What is the distance at which belt conveyors can convey?
a) 100m
b) 200m
c) 50m
d) 500m
Answer: 500m
2. In what speed range does screw conveyor run at?
a) 60 – 80 rpm
b) 20 – 100 rpm
c) 60 – 120 rpm
d) 90 to 180 rpm
Answer: 60 – 120 rpm
3. What is the function of sizer in coal handling?
a) To separate the coal depending on size
b) To check the amount of fuel that is supplied
c) To pick the coal of required size
d) To divert the coal flow into different burners
Answer: To pick the coal of required size
4. Which type of conveyor has shorter life span?
a) Flight conveyor
b) Belt conveyor
c) Screw conveyor
d) Grab bucket conveyor
Answer: Flight conveyor
5. What is the purpose of bucket elevators in coal handling?
a) Used to move coal horizontally
b) Used to lift coal vertically
c) Used to separate the crushed coal and pulverized coal
d) Used to pour the coal vertically at right angles into furnace
Answer: Used to lift coal vertically
6. What is the function of Gab bucket conveyor in coal handling?
a) To lift the coal vertically
b) To crush the coal
c) To move coal from one place to another
d) To separate crushed coal and powdered coal
Answer: To move coal from one place to another
7. In which mode of transport are rotary car dumpers used?
a) Road transport
b) Rail transport
c) Transport by sea or river
d) Inside the plant handling
Answer: Rail transport
8. To what is helicoids screw in screw conveyor is attached?
a) To the shaft
b) To the inner case
c) To the bearings
d) To the outer casing
Answer: To the shaft
9. What is the function of magnetic separator in coal handling?
a) To remove impurities
b) To separate bituminous coal
c) To remove iron particles
d) To separate metal contents
Answer: To remove iron particles
10. Out of all conveyors which type of conveyor has a greater capacity to convey large amount of coal?
a) Belt conveyor
b) Chain conveyor
c) Screw conveyor
d) Scraper conveyor
Answer: Belt conveyor
Coal Weighing Methods Multiple Choice Questions and Answers
1. Which type of weighers is used in place where the electronic weighers are not allowed?
a) Pneumatic weighers
b) Mechanical weighers
c) Nuclear weighers
d) Electronic weighers
Answer: Pneumatic weighers
2. What types of rays does the nuclear weigher used to measure the weight?
a) Infrared rays
b) Ultraviolet rays
c) Gamma rays
d) X-ray waves
Answer: Gamma rays
3. Why is weighment of the coal essential in the plants?
a) For knowing the quantity of the coal present
b) For getting optimum efficiency
c) For knowing which type of coal has good fuel content
d) To separate the grades of coal
Answer: For getting optimum efficiency
4. Electronic weighers are based on which principle?
a) Semiconductor principle
b) Electromagnetic principle
c) Load cell principle
d) Junctions
Answer: Load cell principle
5. Which type of weigher is commonly used all over the world?
a) Electronic weighers
b) Mechanical weighers
c) Pneumatic weighers
d) Nuclear weighers
Answer: Mechanical weighers
6. What does ESP stand for in dust collection?
a) Endothermic sensor plate
b) Extrasensory perception
c) Electrostatic precipitators
d) Electronic stability program
Answer: Endothermic sensor plate
7. What happens when high voltage is applied to the electrodes in electric dust collectors?
a) Forms uniform electric field
b) Corona is formed
c) The whole system gets charged
d) Ions move from emitting electrode to collecting electrode
Answer: Corona is formed
8. What is the main disadvantage of the nuclear weigher?
a) They are not mobile
b) Accuracy depends on speed of material
c) They are big in size, requires large amount of space
d) Consumes large amount of electricity
Answer: They are big in size, requires large amount of space
9. _________ weighers are based on Load cell principle?
a) Semiconductor
b) Electromagnetic
c) Electronic
d) Junctions
Answer: Electronic
10. Gamma types of rays does the nuclear weigher used to measure the weight
a) True
b) False
Answer: True
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