Worksheets143 Session 9- Underground Wiring
Total questions: 25
Worksheet time: 2hrs 5mins
Name
Class
Date
1.
What is the main focus of Session 9?
a)
A) Understanding overhead wiring
b)
B) Learning about underground wiring
c)
C) Identifying common types of insulators
d)
D) Exploring cable routing techniques
2.
What is the advantage of using overhead lines?
a)
A) They are easier to maintain
b)
B) They are more cost-efficient than underground wiring
c)
C) They are less affected by environmental factors
d)
D) They are safer for wildlife
3.
Which of the following is NOT a component of an overhead wiring system?
a)
A) Cores or conductors
b)
B) Metallic sheath
c)
C) Insulators
d)
D) Bedding
4.
What is the purpose of armouring in underground cables?
a)
A) To protect the cable from mechanical damage
b)
B) To improve the flexibility of the cable
c)
C) To increase the conductivity of the cable
d)
D) To provide insulation
5.
What is the main advantage of underground wiring systems?
a)
A) They are suitable for congested areas where overhead lines may be difficult or impossible to install.
b)
B) The maintenance cost is very low, as once installed there is very little ongoing maintenance required.
c)
C) They are not likely to be influenced by shaking and shorting due to vibrations, wind, accidents, etc.
d)
D) They are not easily damaged when buried at a sufficient depth.
6.
What is the main benefit of underground wiring in congested areas?
a)
A) Lower installation cost
b)
B) Higher efficiency
c)
C) Easier maintenance
d)
D) Suitable for areas where overhead lines are difficult to install
7.
What is the purpose of the metallic sheath in underground cables?
a)
A) To protect the cable from mechanical damage
b)
B) To improve the flexibility of the cable
c)
C) To increase the conductivity of the cable
d)
D) To provide insulation
8.
What is the purpose of the insulation around the cores in underground cables?
a)
A) To protect against moisture
b)
B) To increase the flexibility of the cable
c)
C) To provide mechanical protection
d)
D) To withstand the voltage carried by the cable
9.
What material is commonly used for insulation in underground cables?
a)
A) Plastic
b)
B) Rubber
c)
C) Jute
d)
D) Impregnated paper
10.
What is the purpose of the bedding in underground cables?
a)
A) To protect the metallic sheath from corrosion
b)
B) To provide mechanical protection to the cable
c)
C) To improve the flexibility of the cable
d)
D) To increase the conductivity of the cable
11.
What is the purpose of the armouring in underground cables?
a)
A) To protect the cable from mechanical damage
b)
B) To improve the flexibility of the cable
c)
C) To increase the conductivity of the cable
d)
D) To provide insulation
12.
What is serving in underground cables used for?
a)
A) To protect armouring from atmospheric conditions
b)
B) To improve the flexibility of the cable
c)
C) To increase the conductivity of the cable
d)
D) To provide insulation
13.
How are underground cables classified?
a)
A) By their length
b)
B) By the voltage they are used for and the type of insulation material used
c)
C) By the number of cores they have
d)
D) By the type of armouring used
14.
What type of cable is suitable only for low and medium voltages?
a)
A) Screened cables
b)
B) Pressure cables
c)
C) Belted cables
d)
D) Insulated cables
15.
What is the purpose of the metallic screen in H type screened cables?
a)
A) To protect the insulation
b)
B) To provide mechanical protection
c)
C) To improve the flexibility of the cable
d)
D) To increase the conductivity of the cable
16.
What method is used for laying underground cables in tunnels?
a)
A) Direct laying
b)
B) Draw-in system
c)
C) Both A and B
d)
D) None of the above
17.
What are the general rules for underground wiring?
a)
A) The conductors used should be of low conductivity
b)
B) The conductor size should be such that the cable carries the desired load current without overheating
c)
C) The cable must have a thin layer of insulation
d)
D) The materials used in the manufacture of cables should not be chemically stable
18.
What is the purpose of stranding the conductors in underground cables?
a)
A) To improve the flexibility of the cable
b)
B) To increase the conductivity of the cable
c)
C) To protect the cable from mechanical damage
d)
D) To provide insulation
19.
What is the main disadvantage of solid cable types for very high voltages?
a)
A) They are unreliable
b)
B) They are expensive
c)
C) They are difficult to install
d)
D) They are prone to corrosion
20.
What is the main advantage of pressure cables for very high voltages?
a)
A) They are more flexible
b)
B) They are easier to install
c)
C) They eliminate voids in the insulation
d)
D) They are cheaper
21.
What is the main advantage of using pressure cables for very high voltages?
a)
A) They are more flexible than other types of cables
b)
B) They are easier to install in congested areas
c)
C) They eliminate voids in the insulation
d)
D) They have a longer lifespan than other types of cables
22.
What is the purpose of the metallic sheath in underground cables?
a)
A) To provide insulation
b)
B) To improve the flexibility of the cable
c)
C) To protect the cable from mechanical damage
d)
D) To increase the conductivity of the cable
23.
What is the main benefit of using underground wiring systems in congested areas?
a)
A) Lower installation cost
b)
B) Higher efficiency
c)
C) Easier maintenance
d)
D) Suitable for areas where overhead lines are difficult to install
24.
How are underground cables classified?
a)
A) By their length
b)
B) By the number of cores they have
c)
C) By the voltage they are used for and the type of insulation material used
d)
D) By the type of armouring used
25.
What is the purpose of serving in underground cables?
a)
A) To protect armouring from atmospheric conditions
b)
B) To improve the flexibility of the cable
c)
C) To increase the conductivity of the cable
d)
D) To provide insulation
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