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13 Cards in this Set

  • Front
  • Back

The combustion of solid fuel especially coal produces varying amounts of a solid residue called ________. This residue is broken down into different forms _______ and _______.

Ash. Flyash and bottom ash

Name two general system designs for the removal and disposal of ash from a power plant.


A.


B.

A. Mechanical collectors


B. Electrical collectors

State the two key requirements for the installation of cooling ponds for a power plant.


A.


B.

A. Flat surface space


B. Unlimited amounts of cooling water.

Flyash is normally less than:


A) 1 000 microns in diameter


B) 300 microns in diameter


C) 30 microns in diameter


D) 0.3 mm in diameter


E) 1 mm in diameter


C) 30 microns in diameter

Liquid pollutants emitted from power plants include:


1. Water at elevated temperatures


2. Waste water from flue gas scrubbing


3. Waste water from water treatment processes


4. Waste water from ash handling operations


A) 2, 4


B) 2, 3, 4


C) 1, 4


D) 1, 2, 3, 4


E) 1, 3, 4


D) 1, 2, 3, 4

The voltage supplied to an electrostatic precipitator is between:


A) 10 000 volts DC and 100 000 volts DC


B) 10 000 volts AC and 1 000 000 volts AC


C) 100 000 volts AC and 10 000 volts DC


D) 100 000 volts DC and 1 000 000 000 volts AC


E) 1 000 000 volts AC and 1 000 000 000 volts AC


A) 10 000 volts DC and 100 000 volts DC

Some areas of a power plant are difficult or not economically suitable to provide a pollution free area in which employees can work in. These types of areas are:


1. Control rooms


2. Coal conveyor galleries


3. Cleaning ash hoppers or precipitators internally during a boiler repair


4. Lunch rooms


5. Coal crushing and grinding equipment


6. Steam turbine bays


A) 1, 3, 6


B) 3, 4, 6


C) 1, 2, 3, 5


D) 2, 3, 5, 6


E) 2, 3, 4, 5


D) 2, 3, 5, 6

In an electrostatic precipitator, the:


A) Discharge electrode is negatively charged


B) Collector electrode is negatively charged


C) Discharge electrode is positively charged


D) Discharge electrode and the particles are positively charged


E) Particles are positively charged

A) Discharge electrode is negatively charged

Mechanical centrifugal collectors remove particulates by means of:


A) Inertia


B) None of the above


C) All of the above


D) Centrifugal force


E) Gravitational force


C) All of the above

Solid pollutants emitted from power plants are:


1. Dust


2. Soot


3. Flyash


4. Carbon monoxide


5. Sulphur dioxide


6. Sulphuric acid



A) 1, 2, 3, 6


B) 2, 4, 5


C) 1, 2, 3, 4, 5, 6


D) 2, 3, 6


E) 1, 2, 3


E) 1, 2, 3

Mechanical centrifugal collectors are not suitable for the collection of:


A) Coarse particles


B) Heavy particles


C) Very coarse particles


D) Fine particles


E) Rough particles


D) Fine particles

Wet scrubbers remove:


A) Acidic gases only


B) Gases and dust only


C) Dust only


D) Particulates only


E) Gases only


B) Gases and dust only

Flyash is removed from bag filters by a system of:


A) Shakers


B) Hammers


C) Rollers


D) Electrostatic precipitators


E) Rappers


E) Rappers