Electrical Set 2 Vol 3
(105).webp "Electrical Set 2 Vol 3 - Quiz")
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Questions and Answers
- 1.
1. What valuable tool in the electric shop will show you the physical location of distribution system components?
- A.
Schematic drawing
- B.
One one diagram
- C.
As built drawing
- D.
Distribution map
Correct Answer
D. Distribution mapExplanation
A distribution map is a valuable tool in the electric shop as it provides a visual representation of the physical location of distribution system components. It allows electricians to easily identify the placement of various components such as transformers, substations, and power lines. This map helps in planning and troubleshooting electrical systems efficiently, ensuring that maintenance and repairs can be carried out effectively.Rate this question:
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- 2.
2. What informs electric shop personnel of unique conditions on the distribution system?
- A.
Switching chart
- B.
Distribution map
- C.
One line diagram
- D.
Abnormal conditions listing
Correct Answer
D. Abnormal conditions listingExplanation
The correct answer is abnormal conditions listing. An abnormal conditions listing provides information to electric shop personnel about any unique or unusual conditions on the distribution system. It helps them identify and address any abnormal situations or events that may occur, allowing them to take appropriate actions to ensure the smooth functioning of the system. A switching chart, distribution map, and one-line diagram may provide other types of information about the distribution system, but they may not specifically highlight abnormal conditions.Rate this question:
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- 3.
3. What types of conductor support construction should be used on distribution systems located in high moisture environments?
- A.
Steel crossarms or fiberglass crossarms
- B.
Fiberglass crossarms or wood crossarms
- C.
Epoxy fiberglass arms or steel crossarms
- D.
Fiberglass crossarms or epoxy fiberglass arms
Correct Answer
D. Fiberglass crossarms or epoxy fiberglass armsExplanation
In high moisture environments, it is important to use conductor support constructions that are resistant to moisture damage. Fiberglass crossarms and epoxy fiberglass arms are both materials that have high resistance to moisture and are therefore suitable for use in such environments. Steel crossarms and wood crossarms, on the other hand, may be prone to corrosion and decay when exposed to high moisture levels, making them less suitable options.Rate this question:
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- 4.
4. What insulator type is commonly connected to one another?
- A.
Pin
- B.
Strain
- C.
Deadend
- D.
Suspension
Correct Answer
A. PinExplanation
Pin insulators are commonly connected to one another. Pin insulators are used to support and insulate electrical wires on utility poles. They have a cylindrical shape with a grooved top, allowing them to be easily stacked and connected together. The grooves on the top of one pin insulator fit into the corresponding grooves on the bottom of another pin insulator, creating a secure and stable connection between them. This connection helps to maintain the integrity of the electrical system and prevent any electrical leakage or short circuits.Rate this question:
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- 5.
5. What insulator will you use on low voltage or neutral conductors?
- A.
Pin
- B.
Strain
- C.
Spool
- D.
Suspension
Correct Answer
C. SpoolExplanation
The correct answer is "spool." A spool is a cylindrical device used to wind and store electrical wires. In the context of low voltage or neutral conductors, a spool can be used as an insulator to prevent the wires from coming into contact with other conductive materials, reducing the risk of electrical accidents or short circuits.Rate this question:
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- 6.
6. What insulator is used to insulate guy wires?
- A.
Pin
- B.
Strain
- C.
Spool
- D.
Suspension
Correct Answer
B. StrainExplanation
Guy wires are used to provide stability and support to structures such as utility poles or antennas. These wires are subjected to tension and need to be insulated to prevent electrical current from flowing through them. Strain insulators are specifically designed for this purpose. They are made of materials that can withstand the tension and provide electrical insulation, ensuring the safety and functionality of the guy wires. Therefore, strain is the correct answer for the insulator used to insulate guy wires.Rate this question:
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- 7.
7. The American National Standards Institute class of an insulator is determined by the
- A.
Operating voltage
- B.
Atmospheric pollution
- C.
Atmospheric pollution and arcing voltage
- D.
Atmospheric pollution and operating voltage
Correct Answer
D. Atmospheric pollution and operating voltageExplanation
The American National Standards Institute class of an insulator is determined by the level of atmospheric pollution and the operating voltage. This means that the classification of an insulator depends on the amount of pollution present in the environment as well as the voltage at which it is expected to operate. Both factors are important in determining the suitability and effectiveness of an insulator in a given situation.Rate this question:
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- 8.
8. In addition to engineers or the planning section, who assists in making a staking sheet of the area over which the line is to pass?
- A.
A line crew
- B.
A survey crew
- C.
The graphics shop
- D.
The electrical supervisor
Correct Answer
B. A survey crewExplanation
A survey crew assists in making a staking sheet of the area over which the line is to pass. They are responsible for conducting surveys and measurements to determine the exact location and boundaries of the area. This information is essential for the planning and installation of the line, ensuring that it is placed accurately and efficiently. The survey crew works closely with engineers and the planning section to gather the necessary data and create the staking sheet.Rate this question:
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- 9.
9. The AF Form 103, Base Civil Engineering Work Clearance Request, is used for
- A.
Staking sheets
- B.
Digging permits
- C.
Right of way requests
- D.
Overhead line locations
Correct Answer
B. Digging permitsExplanation
The AF Form 103, Base Civil Engineering Work Clearance Request, is used for digging permits. This form is used to request permission for excavation or digging activities on a military base. It ensures that proper safety measures are in place and that any potential hazards are identified and mitigated before the digging begins. This form helps to prevent accidents and damage to underground utilities or infrastructure.Rate this question:
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- 10.
10. How many inches deeper do we set poles that are subject to more strain than normal?
- A.
2
- B.
4
- C.
6
- D.
8
Correct Answer
C. 6Explanation
When poles are subject to more strain than normal, they need to be set deeper in the ground. The correct answer is 6 inches because setting the poles 6 inches deeper provides additional stability and strength to withstand the increased strain. This extra depth helps prevent the poles from being uprooted or damaged due to the higher forces acting upon them.Rate this question:
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- 11.
11. What tool do workers use to position poles on the ground?
- A.
Pike pole
- B.
Cant hook
- C.
Digging bar
- D.
Tamping bar
Correct Answer
B. Cant hookExplanation
Workers use a cant hook to position poles on the ground. A cant hook is a tool with a hooked end that is used to grip and roll logs or poles. It provides leverage and control, allowing workers to easily maneuver and position the poles in the desired location.Rate this question:
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- 12.
12. A large number of poles to be stored are sorted by
- A.
Class
- B.
length
- C.
Length and class
- D.
Length and type of treatment
Correct Answer
B. lengthExplanation
The correct answer is "length". This means that the large number of poles are sorted based on their length.Rate this question:
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- 13.
13. We usually load poles on a trailer using the
- A.
Boom method
- B.
A frame method
- C.
Gin pole method
- D.
Snatch block method
Correct Answer
A. Boom methodExplanation
The correct answer is the boom method. This method involves using a boom, which is a long, horizontal arm attached to the trailer, to lift and load the poles onto the trailer. It provides a stable and controlled way to lift and position the poles, ensuring safe and efficient loading.Rate this question:
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- 14.
14. Where is a wood pole "branded"?
- A.
At the top
- B.
On the bottom
- C.
5 feet from the top
- D.
10 feet up from the butt
Correct Answer
D. 10 feet up from the buttExplanation
A wood pole is "branded" 10 feet up from the butt. This means that a mark or label is applied to the pole at a height of 10 feet from the base or bottom end of the pole. This branding is likely done for identification or measurement purposes.Rate this question:
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- 15.
15. Where local conditions shorten the life of wood poles which pole is preferred?
- A.
Steel
- B.
Concrete
- C.
Aluminum
- D.
Fiberglass
Correct Answer
B. ConcreteExplanation
Concrete poles are preferred in areas where local conditions shorten the life of wood poles. This is because concrete is a durable and long-lasting material that can withstand harsh weather conditions, high winds, and moisture, which can cause wood poles to deteriorate quickly. Concrete poles are also resistant to pests, such as termites, which can further damage wood poles. Additionally, concrete poles have a longer lifespan compared to other materials, making them a reliable choice for areas with challenging environmental conditions.Rate this question:
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- 16.
16. Aluminum poles are most likely used for
- A.
Distribution lines
- B.
Transmission lines
- C.
Secondary service drops
- D.
Roadway and area lighting circuits
Correct Answer
D. Roadway and area lighting circuitsExplanation
Aluminum poles are most likely used for roadway and area lighting circuits because aluminum is a lightweight and durable material that can withstand outdoor conditions. It is also a good conductor of electricity, making it suitable for transmitting power to lighting fixtures. Additionally, aluminum poles are cost-effective compared to other materials, making them a popular choice for lighting installations in public areas such as roadways and parking lots.Rate this question:
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- 17.
17. What type of roof do we find on untreated wood poles?
- A.
Slant
- B.
Gable
- C.
Conical
- D.
Double cut
Correct Answer
A. SlantExplanation
Untreated wood poles typically have a slant roof. This type of roof is sloped at an angle, allowing rainwater to run off easily. The slant roof helps to prevent water from pooling on top of the wood poles, which could lead to rot and decay over time. Additionally, the slant roof provides protection from the elements and helps to keep the interior of the structure dry.Rate this question:
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- 18.
18. What must you do before you cut the roof on a wood pole?
- A.
Locate the front of pole
- B.
Chock both sides of pole
- C.
Locate balance point of pole
- D.
Find the pole's face side and back side
Correct Answer
D. Find the pole's face side and back sideExplanation
Before cutting the roof on a wood pole, it is important to find the pole's face side and back side. This is necessary because the face side of the pole is usually smoother and more aesthetically pleasing, while the back side may have knots or other imperfections. By identifying these sides, you can ensure that the roof cut is made on the appropriate side of the pole for a better overall appearance.Rate this question:
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- 19.
19. What size wood bit do you use to drill the hole for a cross-arm through bolt?
- A.
7/16 inch
- B.
9/16 inch
- C.
11/16 inch
- D.
13/16 inch
Correct Answer
C. 11/16 inchExplanation
The correct size wood bit to drill a hole for a cross-arm through bolt is 11/16 inch. This size is specifically chosen to ensure a tight fit for the bolt, allowing it to securely hold the cross-arm in place. Using a larger or smaller size bit may result in a loose or tight fit, which can compromise the stability and safety of the structure.Rate this question:
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- 20.
20. In using the line truck and winch to set a pole, before you raise the pole slightly attack the winch line
- A.
Above the midpoint of the pole
- B.
Above the butt end of the pole
- C.
Below the top of the pole
- D.
Below the crossarm
Correct Answer
A. Above the midpoint of the poleExplanation
Before raising the pole, it is important to attach the winch line slightly above the midpoint of the pole. This is done to ensure that the pole remains balanced and stable during the lifting process. Placing the winch line above the midpoint helps to distribute the weight evenly and prevent any tilting or tipping of the pole. It also allows for better control and maneuverability while setting the pole in place.Rate this question:
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- 21.
21. If a pole must be set in an energized line what two additional articles of equipment must be used?
- A.
Wire tong and pulling rope
- B.
Rubber gloves and pole guard
- C.
Pole guard and conductor spreader
- D.
Pulling rope and conductor spreader
Correct Answer
B. Rubber gloves and pole guardExplanation
When setting a pole in an energized line, it is crucial to ensure safety and prevent electrical accidents. Rubber gloves are essential to provide insulation and protect against electric shock while handling the energized line. Pole guards are also necessary to create a physical barrier between the pole and the energized line, further reducing the risk of electrical contact. These two additional articles of equipment, rubber gloves and pole guard, are therefore required to safely set a pole in an energized line.Rate this question:
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- 22.
22. The proper type of pole anchor depends largely upon
- A.
Pole height
- B.
Soil conditions
- C.
Length of conductor span
- D.
Wind and snow conditions
Correct Answer
B. Soil conditionsExplanation
The proper type of pole anchor depends largely upon soil conditions. The type of anchor used for a pole will vary depending on the characteristics of the soil it is being installed in. Different types of soil have different load-bearing capacities, so the anchor must be chosen accordingly to ensure stability and support for the pole. Factors such as soil composition, moisture content, and density play a crucial role in determining the appropriate type of anchor to be used.Rate this question:
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- 23.
23. What type of anchor do we use for hard or compact soil?
- A.
Cone
- B.
Screw
- C.
Expanding
- D.
Log deadman
Correct Answer
A. ConeExplanation
In hard or compact soil, we use a cone anchor. This type of anchor is designed with a pointed cone shape that can penetrate the tough soil and provide stability. The cone anchor is commonly used in construction and engineering projects to secure structures or equipment in challenging soil conditions. It is effective in providing strong holding power and preventing movement or displacement.Rate this question:
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- 24.
24. What type of guy do we normally use at a curve in the line?
- A.
Side guy
- B.
Span guy
- C.
Down guy
- D.
Corner guy
Correct Answer
A. Side guyExplanation
A "side guy" is typically used at a curve in the line. This type of guy helps to support and stabilize the line at the side or edge of the curve, preventing it from sagging or becoming unstable.Rate this question:
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- 25.
25. Which of these combinations do you use to draw up a guy wire and hold it in place for attachment to the anchor rod?
- A.
Crimps and winch line
- B.
Chain hoise and two strand grips
- C.
Sheave attachment and cable puller
- D.
Cable attachment and two thimble eyes
Correct Answer
B. Chain hoise and two strand gripsExplanation
A guy wire is used to provide stability and support to a structure, such as a pole or tower. In order to draw up a guy wire and hold it in place for attachment to the anchor rod, a chain hoist and two strand grips are used. A chain hoist is a mechanical device that is used to lift and lower heavy loads, and in this case, it is used to tighten the guy wire. Two strand grips are clamps that are specifically designed to securely hold and grip the guy wire in place. Together, the chain hoist and two strand grips provide the necessary tools to properly tension and secure the guy wire.Rate this question:
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- 26.
26. What factors are considered when establishing the three loading areas for conductors in the United States?
- A.
Latitudinal and transversal loading
- B.
Longitudinal and horizontal loading
- C.
Horizontal, longtiudinal, and vertical loading
- D.
Longitudinal, transverse, and vertical loading
Correct Answer
D. Longitudinal, transverse, and vertical loadingExplanation
When establishing the three loading areas for conductors in the United States, factors such as longitudinal, transverse, and vertical loading are considered. This means that the design and placement of conductors take into account the forces and stresses that can occur in these three directions. Longitudinal loading refers to the forces applied along the length of the conductor, transverse loading refers to the forces applied perpendicular to the length of the conductor, and vertical loading refers to the forces applied vertically or from above. Considering these factors ensures that the conductors can withstand the various types of loads they may experience.Rate this question:
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- 27.
27. How far apart are the pole pins spaced for a 12,470 kilovolt line?
- A.
18 inches
- B.
24 inches
- C.
30 inches
- D.
36 inches
Correct Answer
C. 30 inchesExplanation
The pole pins for a 12,470 kilovolt line are spaced 30 inches apart.Rate this question:
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- 28.
28. In vertical construction, where do we install the first conductor in relation to the top of the utility pole?
- A.
9 inches below the top
- B.
12 inches below the top
- C.
18 inches below the top
- D.
24 inches below the top
Correct Answer
A. 9 inches below the topExplanation
In vertical construction, the first conductor is installed 9 inches below the top of the utility pole. This positioning allows for proper clearance and ensures that the conductor is securely attached to the pole. Placing it slightly below the top also helps to prevent any potential damage or interference with other equipment or lines that may be installed at the top of the pole.Rate this question:
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- 29.
29. When raising a cross-arm the person on the ground uses
- A.
Two clove hitches
- B.
A bowline and half hitch
- C.
A half hitch and clove hitch
- D.
A lineman's hitch and bowline
Correct Answer
C. A half hitch and clove hitchExplanation
When raising a cross-arm, the person on the ground uses a half hitch and clove hitch. These two types of knots are commonly used in this situation because they provide a secure and stable way to attach and raise the cross-arm. The half hitch is a simple knot that is easy to tie and untie, making it convenient for temporary attachments. The clove hitch, on the other hand, is a more secure knot that grips tightly around the object it is tied to. By using both knots together, the person on the ground ensures that the cross-arm is securely attached and can be safely raised.Rate this question:
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- 30.
30. You use a conductor pulled from pole to pole over the cross-arms instead of first laying it out on the ground when
- A.
The area is very wet
- B.
Very small wire is used
- C.
The ground is rough or stony
- D.
There are many trees in the area
Correct Answer
C. The ground is rough or stonyExplanation
When the ground is rough or stony, it may be difficult or impossible to lay the conductor out on the ground without it getting damaged. Therefore, it is more practical to use a conductor that is pulled from pole to pole over the cross-arms, as this allows the conductor to be installed without coming into contact with the rough or stony ground.Rate this question:
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- 31.
31. When building a new pole line, if you are on the second pole which conductor does the person on the ground sends up first?
- A.
"A" phase
- B.
The neutral
- C.
The inside conductor
- D.
The outside conductor
Correct Answer
C. The inside conductorExplanation
When building a new pole line, the person on the ground sends up the inside conductor first. This is because the inside conductor is typically the first one to be installed and connected on a pole line. The inside conductor carries the electrical current and is responsible for transmitting power from the source to the destination. By sending up the inside conductor first, the person on the ground ensures that the electrical connection is established correctly and the power transmission can begin.Rate this question:
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- 32.
32. Which splice uses tapered jaws to hold the conductor?
- A.
Compression
- B.
Twist sleeve
- C.
Sleeve joint
- D.
Automatic
Correct Answer
D. AutomaticExplanation
The correct answer is automatic. Automatic splices use tapered jaws to hold the conductor securely in place. This type of splice is commonly used in electrical wiring and connections, as it provides a reliable and strong connection between two conductors. The tapered jaws ensure that the conductor is held tightly, preventing any movement or loosening over time. This helps to maintain a consistent and uninterrupted flow of electricity.Rate this question:
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- 33.
33. What do you do to prevent a hot line clamp from burning a main conductor?
- A.
Use a stirrup
- B.
Use only similar metals
- C.
Ensure hot line clamps are put on tight
- D.
Attach hot line clamps onto armor rods and tie wires
Correct Answer
A. Use a stirrupExplanation
To prevent a hot line clamp from burning a main conductor, it is recommended to use a stirrup. A stirrup is a device that is used to support and protect the main conductor from the heat generated by the hot line clamp. By using a stirrup, the hot line clamp is kept away from direct contact with the main conductor, reducing the risk of burning or damaging it.Rate this question:
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- 34.
34. What type of insulator is used at the dead end for a primary conductor?
- A.
Pin
- B.
Post
- C.
Strain
- D.
Suspension
Correct Answer
D. SuspensionExplanation
A suspension insulator is used at the dead end for a primary conductor. Suspension insulators are designed to support the weight of the conductor and provide electrical insulation. They are commonly used in overhead power transmission lines, where the conductor is suspended from towers or poles. Suspension insulators have a string of insulator units connected in series, allowing them to withstand high mechanical loads and provide adequate electrical insulation. This type of insulator is specifically designed for dead end applications, where the conductor terminates and needs to be securely supported.Rate this question:
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- 35.
35. How long after the preliminary sagging must you wait to allow conductors to "creep"?
- A.
30 minutes to 4 hours
- B.
15 to 30 minutes
- C.
4 to 6 hours
- D.
6 to 8 hours
Correct Answer
A. 30 minutes to 4 hoursExplanation
After the preliminary sagging, conductors must be allowed to "creep" within a time frame of 30 minutes to 4 hours. This means that after the initial sagging process, a waiting period of 30 minutes to 4 hours is necessary before any further adjustments or movements can be made to the conductors. This time period allows the conductors to settle and adjust to their new position before any additional adjustments are made.Rate this question:
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- 36.
36. What size tie wire do we use for No. 2 conductor?
- A.
No. 8
- B.
No. 6
- C.
No. 4
- D.
No. 2
Correct Answer
C. No. 4Explanation
The correct answer is No. 4. When working with a No. 2 conductor, we use No. 4 tie wire. The size of the tie wire should be smaller than the conductor size to ensure proper insulation and secure connections.Rate this question:
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- 37.
37. Pad mounting is the preferred mounting method for what transformer size?
- A.
75 kVA
- B.
100 kVA
- C.
175 kVA
- D.
225 kVA
Correct Answer
A. 75 kVAExplanation
Pad mounting is the preferred mounting method for transformers with a size of 75 kVA.Rate this question:
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- 38.
38. Which method do we most likely use to install light, single phase transformers?
- A.
Gin pole
- B.
Hand line
- C.
Chain hoist
- D.
Block and tackle
Correct Answer
D. Block and tackleExplanation
Block and tackle is the most likely method used to install light, single phase transformers. This method involves using a system of pulleys and ropes to lift and lower heavy objects. It provides a mechanical advantage, allowing for easier and safer installation of the transformers. The other options mentioned, gin pole, hand line, and chain hoist, may also be used for lifting and installing transformers, but block and tackle is the most commonly used method.Rate this question:
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- 39.
39. Where do you connect the top and bottom connection points of a transformer's lightning arrester?
- A.
Top to transformer, bottom to fused cutout
- B.
Top to ground wire, bottom to transformer
- C.
Top to primary wire, bottom to fused cutout
- D.
Top to primary wire, bottom to ground wire
Correct Answer
D. Top to primary wire, bottom to ground wireExplanation
The correct answer is to connect the top connection point of a transformer's lightning arrester to the primary wire and the bottom connection point to the ground wire. This configuration ensures that any excess electrical energy from a lightning strike is safely directed to the ground, protecting the transformer and preventing damage to the electrical system.Rate this question:
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- 40.
40. What can we install to raise the power factor in a distribution circuit?
- A.
Capacitors
- B.
Transformers
- C.
Sectionalizers
- D.
Variable resistors
Correct Answer
A. CapacitorsExplanation
Capacitors can be installed to raise the power factor in a distribution circuit. Capacitors are used to correct the power factor by supplying reactive power to the circuit, which helps to balance the reactive power and reduce the reactive component of the current. This improves the efficiency of the circuit and reduces the losses. Capacitors are commonly used in power systems to improve the power factor and optimize the energy consumption.Rate this question:
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- 41.
41. What device do we use across a capacitor's terminals to gradually discharge the capacitor?
- A.
Resistor
- B.
Condenser
- C.
Transformer
- D.
Shorting stick
Correct Answer
D. Shorting stickExplanation
A shorting stick is used across a capacitor's terminals to gradually discharge the capacitor. This is done by connecting the two terminals of the capacitor with a conductive material, such as a metal stick, which allows the stored charge in the capacitor to flow through the stick and dissipate. This process helps to ensure that the capacitor is safely discharged before any maintenance or handling is performed.Rate this question:
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- 42.
42. What minimum depth below grade should you install a 12,470 volts alternating current (VAC) circuit using rigid, nonmetallic conduit?
- A.
24 inches
- B.
36 inches
- C.
18 inches
- D.
42 inches
Correct Answer
C. 18 inchesExplanation
The minimum depth below grade to install a 12,470 VAC circuit using rigid, nonmetallic conduit is 18 inches. This depth is required to ensure the safety and protection of the circuit from potential damage or interference. Installing the circuit at a deeper depth would provide additional protection, but 18 inches is the minimum requirement.Rate this question:
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- 43.
43. Ducts that terminate in a building must be sealed to prevent
- A.
Fire and smoke from entering a building
- B.
Insects and gases from entering a building
- C.
Gases and rodents from entering a building
- D.
Insects and rodents from entering a building
Correct Answer
D. Insects and rodents from entering a buildingExplanation
Ducts that terminate in a building must be sealed to prevent insects and rodents from entering a building. This is important because insects and rodents can carry diseases and cause damage to the building and its occupants. By sealing the ducts, it helps to maintain a clean and sanitary environment inside the building, ensuring the safety and well-being of the people inside.Rate this question:
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- 44.
44. What information is marked on manhole covers?
- A.
Cable direction
- B.
Circuit identification
- C.
Presence of hight voltage
- D.
Ownership or type of utility
Correct Answer
D. Ownership or type of utilityExplanation
Manhole covers are typically marked with information about the ownership or type of utility. This helps identify which utility company or organization is responsible for the maintenance and operation of the infrastructure located beneath the manhole cover. It also helps prevent unauthorized access to the utility systems and ensures that the appropriate personnel are notified in case of any issues or emergencies.Rate this question:
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- 45.
45. What is the minimum size of a constructed manhole?
- A.
4 feet by 6 feet by 6 feet
- B.
6 feet by 7 feet by 6 feet
- C.
8 feet by 8 feet by 8 feet
- D.
8 feet by 10 feet by 8 feet
Correct Answer
A. 4 feet by 6 feet by 6 feetExplanation
The minimum size of a constructed manhole is 4 feet by 6 feet by 6 feet.Rate this question:
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- 46.
46. The use of 90 degree bends in ducts lines is permitted for
- A.
Pole risers
- B.
Stranded copper cables
- C.
Duct runs of less than 50 feet
- D.
Cables that are no. 2 AWG or smaller
Correct Answer
A. Pole risersExplanation
The use of 90 degree bends in ducts lines is permitted for pole risers.Rate this question:
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- 47.
47. What is the purpose of a vault?
- A.
House multiple cable racks
- B.
Isolate electrical equipment
- C.
House submersible regulators
- D.
Open faulted underground cable
Correct Answer
B. Isolate electrical equipmentExplanation
The purpose of a vault is to isolate electrical equipment. A vault provides a secure and controlled environment for electrical equipment, protecting it from external factors such as weather, vandalism, and unauthorized access. By isolating the equipment, the vault ensures its proper functioning and minimizes the risk of accidents or damage.Rate this question:
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- 48.
48. Junction boxes located in an underground vault must
- A.
Be pained
- B.
Have ventilation ports
- C.
Provide a water tight seal
- D.
Be no smaller than 24 inches
Correct Answer
C. Provide a water tight sealExplanation
Junction boxes located in an underground vault must provide a water tight seal to ensure that no moisture or water can enter the box. This is important because underground environments are prone to water infiltration, which can damage the electrical components inside the box and cause malfunction or electrical hazards. A water tight seal ensures the protection and integrity of the junction box, preventing any potential damage from moisture or water.Rate this question:
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- 49.
The mechanical strength of underground cable is not a major concern because the cable is
- A.
Insulated
- B.
Hard drawn
- C.
Not under tension
- D.
Kept cooler underground
Correct Answer
C. Not under tensionExplanation
The mechanical strength of underground cable is not a major concern because the cable is not under tension. This means that there is no significant force or stress being applied to the cable, which reduces the risk of it breaking or getting damaged. The lack of tension also helps to prevent any stretching or elongation of the cable, ensuring its structural integrity is maintained.Rate this question:
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- 50.
50. What material is used between the conductor and the cable insulation?
- A.
Metal braid
- B.
Plastic sheath
- C.
Varnish cambric
- D.
Strand shielding
Correct Answer
D. Strand shieldingExplanation
The material used between the conductor and the cable insulation is strand shielding.Rate this question:
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Mar 19, 2024Quiz Edited by
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Apr 15, 2020Quiz Created by
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