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Class 12 Electronics Chapter 2 Busway in Control Panel Design
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Busway in Control Panel Design
Chapter: 2
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A. Multiple choice questions:
1. The two types of busways are ____________ .
(a) Feeder and service entrance.
(b) Feeder and plug-in.
(c) Plug-in and service enter.
(d) Indoor and outdoor.
Ans: (b) Feeder and plug-in.
2. How many phases are used for heavy voltage supply in the busway?
(a) Two.
(b) Four.
(c) Three.
(d) Five.
Ans: (c) Three.
3. The maximum current rating of a busway with aluminium busbars is ____________ amperes.
(a) 2,000
(b) 3,000
(c) 4,000
(d) 5,000
Ans: (c) 4,000
4. The busbar shown in the figure is used for which busway?
(a) Feeder.
(b) Plug-in.
(c) Service entrance.
(d) Outdoor.
Ans: (b) Plug-in.
5. Which of the following is used to provide airtight connection to a busway?
(a) Reducers.
(b) Service heads.
(c) Flanges.
(d) Expansion fittings.
Ans: (c) Flanges.
6. Which of the following is used to hang the busway?
(a) End closers.
(b) Service heads.
(c) Hanger.
(d) Flanged ends.
Ans: (c) Hanger.
7. What is the current carrying capacity of a copper busbar?
(a) 5000 amperes.
(b) 1000 amperes.
(c) 2000 amperes.
(d) 3000 amperes.
Ans: (b) 1000 amperes.
8. Combination elbows can turn a busway system and ____________.
(a) Up and right.
(b) Left and down.
(c) Right and left.
(d) Up or down and right or left.
Ans: (d) Up or down and right or left.
B. Fill in the blanks:
1. A ____________ distributes electrical power throughout a building.
Ans: Switchboard.
2. Electrical power in a commercial area can be distributed using ____________ .
Ans: Busway.
3. Busways have ____________ inside their enclosure.
Ans: Busbar.
4. A standard busbar is made up of _____________ or _____________.
Ans: Aluminium or copper.
5. In enclosure, ____________ tape is used to wrap a busbar.
Ans: Glass wrap.
6. To provide air tight sealing, ____________ is used in a busway system.
Ans: Flange.
7. To continue the busway in the same direction ____________ is used.
Ans: Offset.
8. The two types of busways are ____________ and ____________.
Ans: Feeder and plugin.
9. To expand the busway in four directions, ______________ is used.
Ans: Crosses.
10. In high power distribution ____________ phases and ____________ neutrals are used in a busway.
Ans: 3 and 1
C. State whether the following statements are True or False:
1. Hangers are used to support a busway. These hangers counter the weight of a busway.
Ans: True.
2. The flange provides an air tight seal around a busway.
Ans: True.
3. Hanger is used to turn the busbar in right or left direction.
Ans: Fase.
4. Combination elbows can turn a busway system up or down, and right or left.
Ans: True.
5. In a distribution system, electrical power is distributed using a power cable and wires.
Ans: True.
6. NEMA stands for National Electrical Manufacturers Association.
Ans: True.
7. A plug-in busway is dynamic in nature.
Ans: True.
8. A feeder busway is static in nature.
Ans: True.
9. A joint stack is used to terminate a busbar.
Ans: Fase.
10. A centre tape box is used to hang the bars.
Ans: Fase.
D. Short answer questions:
1. What is a busway?
Ans: A busway is a prefabricated electrical distribution system. The purpose of a busway is to carry the busbars kept in a protective enclosure. A busway includes busbars, an insulating material and housing.
2. What are the types of a busway?
Ans: Busways are of two types – feeder busway, and plug-in busway.
3. Differentiate between a feeder busway and a plug-in busway.
Ans: Feeder Busway: Feeder busways are used to distribute power to loads that are either fixed in place or are concentrated in one physical area. These loads may be a large machine, motor control centre, panel board, or switchboard. In industries there are a number of loads that require a continuous supply from the source for a very long time. In these cases feeder busways are used.
Feeder busways are used at a service entrance. The service entrance is the point from where supply conductors enter a building or other structure. Feeder busways are used to bring power from a utility transformer to the main switchboard inside a building.
Plug-in Busway: By using plug-in busway units, load connections can be added or relocated easily. A plug-in busway is used in applications where power requirements are distributed over a large area. A plug-in busway is for indoor use only.
4. What is the role of flanges in the busway?
Ans: Flanges are used to connect the busway to switchgear, transformer or any other equipment. Flanges can be installed at the end of a busway run to make a permanent connection to the equipment.
5. List out the names of various busway system components.
Ans: Busway system component: There are a number of components that form a busway system. Some of them have been listed in this section. Certain components available in one type of busway system may not be available in another type.
(i) Joint Stack: A busway system uses a single-bolt joint stack to connect busway sections.
(ii) Elbows: Elbows allow for turns and height changes in a busway system.
(iii) Combination Elbows: Combination elbows can also turn the busway system up or down, and right or left.
(iv) Tees: A tee is T-shaped busway. It has three directions.
(v) Crosses: A cross allows a busway run to expand in four directions.
(vi) Offsets: Offsets allow the busway system to continue in the same direction.
(vii) Cable Tap Boxes: A tap box is used to connect electrical cables to the busway distribution system.
(viii) End Cable Tap Boxes: End cable tap boxes can be installed at either end of the busway system.
(ix) Centre or Plug-in Cable Tap Boxes: Plug-in cable tap boxes can be used in a plug-in busway.
6. Identify the components in the following illustration:
(a) Tee
(b) Elbow
(c) Feeder Busway
(d) Wall Flange
(e) Plug-in Unit
(f) Plug-in Busway
(g) End Closer
(h) Plug-in Outlet
Ans: So the illustration can be written as:
(a) Tee – 1
(b) Elbow – 2
(c) Feeder Busway – 3
(d) Wall Flange – 4
(e) Plug-in Unit – 5
(f) Plug-in Busway – 6
(g) End Closer – 7
(h) Plug-in Outlet – 8
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