Daddys Quiz Part 5
Daddys quiz part 5
Questions and Answers
- 1.
What is the voltage and class of orange blankets?
- A.
20 kv, type I class 2
- B.
They have no rating
- C.
30 kv, type II class 3
- D.
40 kv, type II class 4
Correct Answer
D. 40 kv, type II class 4 -
- 2.
What is the purpose of putting a shaunt capacitor on a line?
- A.
To dampen ferroresonance
- B.
To increase line current
- C.
To correct power factor
- D.
To eliminate the 9th harmonic
Correct Answer
C. To correct power factorExplanation
Putting a shunt capacitor on a line is done to correct power factor. Power factor is a measure of how effectively electrical power is being used. When the power factor is low, it means that the electrical system is not efficiently utilizing the power being supplied. By adding a shunt capacitor, the reactive power component is reduced, which improves the power factor. This helps in minimizing energy losses, improving voltage stability, and increasing the overall efficiency of the electrical system.Rate this question:
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- 3.
If work is to be done on the secondary circuit of a CT with the primary circuit still carrying current you must..?
- A.
Work must not be done if the primary so the CT is still carrying current
- B.
Be careful and use rubber gloves
- C.
Short and ground the secondary terminals of the CT
- D.
Open circuit the CT and stay clear of the terminals
Correct Answer
C. Short and ground the secondary terminals of the CTExplanation
When work is to be done on the secondary circuit of a CT with the primary circuit still carrying current, it is necessary to short and ground the secondary terminals of the CT. This is because the secondary circuit of a CT is designed to carry a very low voltage, and shorting and grounding the terminals ensures that any residual current is safely discharged. This prevents the risk of electrical shock or damage to equipment. It is important to take this precautionary measure before performing any work on the secondary circuit.Rate this question:
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- 4.
Which of the combination represents one forward and one reverse rotation?
- A.
ACB, ABC
- B.
CAB, BCA
- C.
ABC, CAB
- D.
ABC, BCA
Correct Answer
A. ACB, ABCExplanation
The combination ACB represents one forward rotation followed by one reverse rotation. This is because the first letter A is followed by C, indicating a forward rotation, and then followed by B, indicating a reverse rotation. Similarly, the combination ABC represents one forward rotation followed by one reverse rotation, as the letters are arranged in the order A, B, C.Rate this question:
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- 5.
What is the name and safe work load of this piece of equipment
- A.
Rope snubbing bracket - 1000lbs
- B.
Rope snubbing bracket - 1500lbs
- C.
Ring band - 1500lbs
- D.
Pole tong saddle - 1000lbs
Correct Answer
A. Rope snubbing bracket - 1000lbsExplanation
The correct answer is "rope snubbing bracket - 1000lbs". This piece of equipment is called a rope snubbing bracket and it has a safe work load of 1000lbs. This means that it can safely handle a maximum load of 1000lbs without any risk of failure or damage.Rate this question:
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- 6.
When pulling up a hot conductor what must be placed between the sling and the jack?
- A.
A roler lin stick
- B.
A rope snubbing bracket
- C.
An insulator cradle
- D.
A spiral link stick
Correct Answer
D. A spiral link stickExplanation
When pulling up a hot conductor, a spiral link stick must be placed between the sling and the jack. This is because a spiral link stick is specifically designed to provide insulation and protection against electrical currents. It helps to prevent any contact between the hot conductor and the sling or jack, reducing the risk of electrical shock or damage.Rate this question:
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- 7.
That maximum leakage current on the boom of a truck to be used in live line work is..?
- A.
1 ua/kv (phase to ground voltage)
- B.
1 ma/kv (phase to ground voltage)
- C.
1 ma/kv (phase to phase voltage)
- D.
1 ua/kv (phase to phase voltage)
Correct Answer
D. 1 ua/kv (phase to phase voltage)Explanation
The correct answer is 1 ua/kv (phase to phase voltage). This means that the maximum leakage current on the boom of a truck to be used in live line work should be 1 microampere per kilovolt of phase to phase voltage. This is important because it ensures that the leakage current is kept at a safe and minimal level, reducing the risk of electrical shock or damage to the equipment.Rate this question:
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- 8.
When using an axillary arm what is the maximum angie of bisect tension that is allowed
- A.
15 degrees
- B.
5 degrees
- C.
20 degrees
- D.
10 degrees
Correct Answer
B. 5 degreesExplanation
When using an axillary arm, the maximum angle of bisect tension that is allowed is 5 degrees. This means that the arm should not be positioned at an angle greater than 5 degrees from the midline of the body. This restriction is likely in place to ensure proper alignment and stability of the arm, minimizing strain and potential injury to the user.Rate this question:
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- 9.
The proper method to store rubber blanket is
- A.
Folded and stored behind the seat
- B.
Rolled tightly and taped
- C.
Rolled up and placed in a round container
- D.
Folded and placed in bag
Correct Answer
C. Rolled up and placed in a round containerExplanation
The correct answer is rolled up and placed in a round container. This method ensures that the rubber blanket is protected from damage and kept in a compact and organized manner. Rolling up the blanket helps to prevent creases and folding marks, which can affect its performance. Placing it in a round container further protects it from dust, moisture, and any potential damage. This method also allows for easy transportation and storage, as the container can be easily stacked or placed in a designated area.Rate this question:
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- 10.
What is the correct method for checking a rubber blanket
- A.
Roll corner to corner and do both sides
- B.
Air test
- C.
Roll side to side
- D.
Stretch diagonally
Correct Answer
A. Roll corner to corner and do both sidesExplanation
The correct method for checking a rubber blanket is to roll it from corner to corner and check both sides. This ensures that all areas of the blanket are thoroughly inspected for any damage or wear. Rolling it side to side or stretching it diagonally may not provide an accurate assessment of the blanket's condition. Additionally, an air test is not mentioned and therefore not the correct method for checking a rubber blanket.Rate this question:
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- 11.
In a street light fixture what affects the light pattern
- A.
Refractor and glass density
- B.
Refractor and diffuser
- C.
Refractor and reflector
- D.
Diffuser and reflector
Correct Answer
C. Refractor and reflectorExplanation
In a street light fixture, the light pattern is affected by the refractor and reflector. The refractor is responsible for directing and focusing the light emitted by the bulb, while the reflector helps to enhance and distribute the light in a desired pattern. Together, these two components play a crucial role in determining the effectiveness and efficiency of the street light in illuminating the surrounding area.Rate this question:
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- 12.
If you have a street light lamps which operate at 100 lumens/watt and have a burning time of 2400 hours what type of bulb is being used?
- A.
Mercury vapor
- B.
Low pressure sodium
- C.
Metal halide
- D.
High pressure sodium
Correct Answer
D. High pressure sodiumExplanation
The correct answer is high pressure sodium. High pressure sodium bulbs have a high efficacy of 100 lumens/watt, meaning they produce 100 lumens of light for every watt of power consumed. Additionally, they have a long burning time of 2400 hours. Mercury vapor and metal halide bulbs also have high efficacies, but low pressure sodium bulbs have a much lower efficacy of around 180 lumens/watt. Therefore, high pressure sodium is the most likely type of bulb being used.Rate this question:
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- 13.
The length of a street light davit arm along the road is determined by..
- A.
The distance of the pole from the curb
- B.
The weight of the head
- C.
The lumen rating of the head
- D.
The angle of deflection of the arm
Correct Answer
A. The distance of the pole from the curbExplanation
The length of a street light davit arm along the road is determined by the distance of the pole from the curb. The distance between the pole and the curb determines how far the arm needs to extend to properly position the light head over the road. If the pole is closer to the curb, the arm will need to be shorter. Conversely, if the pole is further away from the curb, the arm will need to be longer to reach the desired position. Therefore, the distance of the pole from the curb is a crucial factor in determining the length of the davit arm.Rate this question:
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- 14.
A photoelectric control in a streetlight is..
- A.
To limit the starting current in the light
- B.
A light sensitive switch
- C.
To assist the mercury vapor light to start
- D.
Sensitive to barometric pressure
Correct Answer
B. A light sensitive switchExplanation
The correct answer is "a light sensitive switch." A photoelectric control in a streetlight is a device that detects the presence or absence of light. It is designed to automatically turn the streetlight on when it gets dark and off when it gets light. This is achieved by using a light sensitive switch that detects the amount of light in the surroundings and triggers the streetlight accordingly.Rate this question:
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- 15.
When checking out a street light which is not working, you find no voltage at the termination block in the head your next check would be
- A.
The photo cell
- B.
The secondary connections
- C.
The bulb
- D.
The relay
Correct Answer
B. The secondary connectionsExplanation
If there is no voltage at the termination block in the head of the street light, the next logical step would be to check the secondary connections. The secondary connections are responsible for distributing the voltage from the termination block to the various components of the street light, including the photo cell, bulb, and relay. By checking the secondary connections, it can be determined if there is a fault or loose connection that is preventing the voltage from reaching the termination block.Rate this question:
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- 16.
What type of bulb could ignite if broken and exposed to water
- A.
Mercury vapor
- B.
High or low pressure sodium
- C.
Krypton halide
- D.
Metal halide
Correct Answer
B. High or low pressure sodiumExplanation
High or low pressure sodium bulbs could ignite if broken and exposed to water. This is because these types of bulbs contain a reactive metal, sodium, which can react with water to form sodium hydroxide and release hydrogen gas. The release of hydrogen gas can lead to an explosion or fire if ignited. Therefore, it is important to handle and dispose of these bulbs carefully to avoid any accidents.Rate this question:
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- 17.
What does potential transformers do
- A.
Reduce line voltage for metering
- B.
Increase line voltage for metering
- C.
Regulates line voltages for metering
- D.
Back up transformer for metering
Correct Answer
A. Reduce line voltage for meteringExplanation
Potential transformers (PTs) are used to reduce the line voltage for metering purposes. PTs are typically used in electrical power systems to step down high voltage levels to a lower, more manageable voltage level that can be safely measured by meters and instruments. By reducing the line voltage, PTs ensure accurate and safe measurement of electrical parameters such as voltage, current, and power.Rate this question:
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- 18.
What connection should always be made first when installing services
- A.
B phase
- B.
Neutral
- C.
C phase
- D.
A phase
Correct Answer
B. NeutralExplanation
When installing services, the connection that should always be made first is the neutral connection. The neutral wire carries the return current from the electrical load back to the source, ensuring that the circuit is complete and balanced. This connection is crucial for the proper functioning and safety of the electrical system. By connecting the neutral first, it ensures that the circuit is properly grounded and reduces the risk of electrical shocks or malfunctions.Rate this question:
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- 19.
A device for storing an electric charge. A device used for introducing capacitance into a circuit
- A.
Generator
- B.
Voltage generator
- C.
Capacitor
- D.
Transformer
Correct Answer
C. CapacitorExplanation
A capacitor is a device used for storing an electric charge and introducing capacitance into a circuit. It is capable of storing energy in an electric field between two conductive plates. When a voltage is applied across the plates, one plate accumulates positive charge while the other accumulates negative charge. This storage of charge allows capacitors to release energy quickly when needed, making them useful in many electronic applications. A generator and voltage generator are devices that produce electrical energy, while a transformer is used to transfer electrical energy between different circuits.Rate this question:
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- 20.
Severe stress when a load suddenly drops a distance and is suddenly stopped by the line before it hits the ground
- A.
Shock load
- B.
Over load
- C.
Repeated load
- D.
Stress load
Correct Answer
A. Shock loadExplanation
A shock load refers to a sudden and intense force or impact applied to a load. In this scenario, when a load drops a distance and is abruptly stopped by the line before hitting the ground, it experiences a sudden and severe stress. This sudden and intense force is what is known as a shock load.Rate this question:
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- 21.
To test a pole to determine if it is safe to climb would you :Visual check from ground to top, check if any rot is present, prod with bar or sharp object and dig up butt
- A.
Yes
- B.
No
- C.
Maybe
- D.
Unknown
Correct Answer
A. YesExplanation
The given answer "Yes" suggests that to test a pole for safety before climbing, one should visually check from the ground to the top, check for any signs of rot, prod with a bar or sharp object, and dig up the butt. This implies that all of these actions are necessary to ensure the pole is safe to climb.Rate this question:
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- 22.
What converts the hydraulic flow and pressure to mechanical energy
- A.
Hydraulic motor
- B.
Hydraulic valves
- C.
Hydraulic pump
- D.
Radiator
Correct Answer
A. Hydraulic motorExplanation
A hydraulic motor is a device that converts hydraulic flow and pressure into mechanical energy. It uses the pressure of a hydraulic fluid to generate rotational motion, which can be used to power various machinery and equipment. Unlike a hydraulic pump that generates flow and pressure, a hydraulic motor takes in the flow and pressure and converts it into mechanical power. Therefore, a hydraulic motor is the correct answer for this question.Rate this question:
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- 23.
How is heat from the pressure and friction of oil dissipated
- A.
Through the valves
- B.
Through the hose
- C.
Through the hydraulic oil reservoir
- D.
Through the radiator
Correct Answer
D. Through the radiatorExplanation
Heat from the pressure and friction of oil is dissipated through the radiator. The radiator is designed to remove heat from the hydraulic oil by transferring it to the surrounding air. As the oil passes through the radiator, the heat is transferred to the metal fins of the radiator, which increases the surface area available for heat dissipation. The surrounding air then cools the metal fins, effectively dissipating the heat from the oil. This process helps to maintain the optimal temperature of the hydraulic system and prevent overheating.Rate this question:
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- 24.
What valve keeps the hydraulic system from over pressurizing?
- A.
Holding valve
- B.
Spool valve
- C.
Globe valve
- D.
Relief valve
Correct Answer
D. Relief valveExplanation
A relief valve is designed to prevent the hydraulic system from over pressurizing by releasing excess pressure. When the pressure in the system exceeds a certain set point, the relief valve opens, allowing the excess fluid to escape and relieving the pressure. This helps to protect the system from damage and ensures that the pressure remains within safe limits. Therefore, the relief valve is the correct answer to the question.Rate this question:
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- 25.
Mouth to moth is the best pole top resuscitation method
- A.
Yes
- B.
No
- C.
Maybe
- D.
Unknown
Correct Answer
A. YesExplanation
The given statement suggests that "mouth to mouth" is the best method for resuscitation at the pole top. This implies that in emergency situations at the pole top, using mouth to mouth resuscitation is the most effective way to revive someone. The answer "Yes" indicates agreement with this statement, implying that the given method is indeed the best option for resuscitation in such circumstances.Rate this question:
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- 26.
How can you determine the lifting capacity of the boom for angle and extension required
- A.
Refer to equipment chart
- B.
Ask a supervisor
- C.
Ask a dealer representative
- D.
Trough trial and error
Correct Answer
A. Refer to equipment chartExplanation
To determine the lifting capacity of the boom for a specific angle and extension required, one should refer to the equipment chart. The equipment chart provides detailed information about the lifting capacity of the boom based on different angles and extensions. By consulting the chart, one can accurately determine the maximum weight that the boom can lift in a given configuration, ensuring safe and efficient operation.Rate this question:
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- 27.
When is a conductor considered safe for hand contact
- A.
When on an insulated platform
- B.
When told to do so
- C.
When dead and grounded
- D.
When working from a bucket boom
Correct Answer
D. When working from a bucket boomExplanation
When working from a bucket boom, a conductor is considered safe for hand contact because the bucket boom provides insulation and protects the worker from direct contact with the conductor. The worker is elevated and separated from the ground, reducing the risk of electric shock. This method ensures a safe working environment for the worker when handling the conductor.Rate this question:
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- 28.
How should rubber line hoses be inspected for cuts or corona damage
- A.
Apple powder compound on surface to visually check for damage
- B.
Turn inside out to check for corona damage
- C.
They should be given an airtest to check for holes
- D.
Scraping for uneven surface due to cracks and damage
Correct Answer
B. Turn inside out to check for corona damageExplanation
Rubber line hoses should be inspected for cuts or corona damage by turning them inside out. By doing so, any potential corona damage, which is a phenomenon that occurs due to electrical discharges, can be visually detected. This method allows for a thorough examination of the hose's inner surface, where corona damage is more likely to occur. It is a reliable way to identify any signs of damage and ensure the integrity of the hoses.Rate this question:
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- 29.
What is the type of knot used in pole top rescue
- A.
Butterfly knot
- B.
Timber hitch
- C.
Bowline
- D.
Clove hitch
Correct Answer
C. BowlineExplanation
The bowline knot is commonly used in pole top rescue. This knot creates a secure loop that can be easily tied and untied, making it ideal for rescue situations. It is known for its strength and reliability, as it does not slip or loosen under tension. The bowline knot is often used in activities such as climbing, sailing, and rescue operations due to its simplicity and effectiveness.Rate this question:
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- 30.
A method of grounding primary conductors that ensures all the materials the lineman may contact, stays at the same voltage level in the event of accidental re-energization
- A.
System ground
- B.
Casing ground
- C.
Equi-potential grounding
- D.
Pole grounding
Correct Answer
C. Equi-potential groundingExplanation
Equi-potential grounding is a method of grounding primary conductors that ensures all the materials the lineman may contact stay at the same voltage level in the event of accidental re-energization. This means that if a lineman accidentally comes into contact with a live conductor, the equi-potential grounding system will ensure that all other conductive materials, such as the lineman's tools or the surrounding infrastructure, are at the same voltage level as the conductor. This helps to minimize the risk of electric shock or injury to the lineman and others in the vicinity.Rate this question:
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- 31.
What is the purpose of a pole band
- A.
Safety caution for switching operations
- B.
To identify height, type and class
- C.
For installing cross arms on concrete poles
- D.
To stablish an equi-potential working zone
Correct Answer
D. To stablish an equi-potential working zoneExplanation
The purpose of a pole band is to establish an equi-potential working zone. This means that it helps to ensure that the electrical potential is the same at all points within the working zone, reducing the risk of electric shock or other electrical hazards. By providing a conductive path around the pole, the pole band helps to prevent potential differences that could occur due to electrical faults or other factors. This helps to create a safer working environment for those performing tasks on or near the pole.Rate this question:
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- 32.
What is the sure method of protecting backfeed from the secondary of a transformer
- A.
Remove risers from secondary bushings
- B.
Short out secondary wires
- C.
Install ground to primary busing
- D.
Short out load service drop
Correct Answer
A. Remove risers from secondary bushingsExplanation
Removing risers from secondary bushings is a sure method of protecting backfeed from the secondary of a transformer. Risers are the insulating supports that elevate the bushings above the transformer tank. By removing the risers, the secondary bushings are brought down to the same level as the transformer tank, reducing the risk of backfeed. This ensures that any potential backfeed is prevented from flowing back into the transformer and causing damage or safety hazards.Rate this question:
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- 33.
Insulated handle jack with a web strap used for hot line procedures
- A.
Web hoist
- B.
Jack strap
- C.
Chain hoist
- D.
Capstan hoist
Correct Answer
A. Web hoistExplanation
A web hoist is a type of lifting equipment that uses a web strap to lift and lower objects. It is commonly used in hot line procedures, where insulated handle jacks with web straps are used to safely handle electrical equipment. The other options, jack strap, chain hoist, and capstan hoist, do not specifically mention the use of a web strap or insulation, making them less suitable for hot line procedures.Rate this question:
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- 34.
What are running grounds
- A.
Grounds on rolling sheaves
- B.
Grounds on overhead static wire
- C.
Pole grounds
- D.
System grounds
Correct Answer
A. Grounds on rolling sheavesExplanation
Grounds on rolling sheaves refer to the grounding of the rolling sheaves, which are pulley-like devices used in various mechanical systems. These grounds are essential for safety reasons as they help to prevent electrical shocks and ensure proper functioning of the system. By grounding the rolling sheaves, any excess electrical charge or static electricity is safely discharged to the ground, reducing the risk of electrical hazards. This type of grounding is commonly used in machinery and equipment that involves moving parts or rotating components.Rate this question:
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- 35.
When installing a safety ground what connection is made first
- A.
Phase B
- B.
Phase C
- C.
Phase A
- D.
Ground and system neutral
Correct Answer
D. Ground and system neutralExplanation
When installing a safety ground, the connection that is made first is between the ground and system neutral. This connection is crucial for providing a path for electrical current to flow safely to the ground in the event of a fault or electrical surge. By connecting the ground and system neutral first, any excess current can be directed away from the electrical system and into the ground, preventing potential damage to equipment and ensuring the safety of individuals.Rate this question:
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- 36.
What are two fucntions of a [feed through]
- A.
Additional primary feed and primary switch
- B.
Grounding and winding replacement
- C.
Grounding and transformer replacement
- D.
Additional primary feed and bushing replacement
Correct Answer
C. Grounding and transformer replacementExplanation
The two functions of a feed through are grounding and transformer replacement. Grounding is important to ensure the safety of electrical systems by providing a path for electrical current to flow into the ground in case of a fault. Transformer replacement refers to the process of replacing a faulty or outdated transformer with a new one to ensure efficient power distribution.Rate this question:
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- 37.
Enables tip replacement after repeated load break operation
- A.
Cut out switch
- B.
Load buster tool
- C.
Fuselink barrel
- D.
Arc follower
Correct Answer
D. Arc followerExplanation
The arc follower enables tip replacement after repeated load break operation. This suggests that the arc follower is a component or mechanism that allows for the replacement of the tip of a device or tool that is used for load break operations. This is important because repeated load break operations can cause wear and tear on the tip, making it necessary to replace it in order to maintain the functionality and effectiveness of the device or tool.Rate this question:
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- 38.
What is concentric neutral cable in reference to the Under Ground Distribution system
- A.
Insulated neutral ground wire wound around the cable
- B.
A seven strand copper wired used for grounding
- C.
Insulated neutral ground cable parallel the cables
- D.
A copper strand wound around the cable
Correct Answer
D. A copper strand wound around the cableExplanation
Concentric neutral cable refers to a cable where a copper strand is wound around the main cable. This copper strand serves as the neutral conductor, providing a return path for the current in the system. The winding of the copper strand around the cable helps to maintain a balanced distribution of electrical current and reduces the risk of damage or interference. This design is commonly used in underground distribution systems to ensure safe and efficient power transmission.Rate this question:
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- 39.
What is parking stand
- A.
A parking sign
- B.
An early warning device
- C.
An insulated stand off
- D.
A wheel chocks
Correct Answer
C. An insulated stand offExplanation
The correct answer is an insulated stand off. A parking stand is a device used to keep a vehicle elevated off the ground, typically for maintenance or storage purposes. An insulated stand off refers to a stand off that is designed to provide electrical insulation, preventing the transfer of electrical current between the vehicle and the ground. This is important to ensure safety when working on electrical systems or when dealing with electric vehicles.Rate this question:
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- 40.
To prevent water from entering the cable it is important to install
- A.
A leak proof gasket
- B.
A sealing compound
- C.
A silicone compound
- D.
A water stop
Correct Answer
D. A water stopExplanation
A water stop is the most effective solution for preventing water from entering the cable. It is specifically designed to create a barrier that stops water from seeping through. This device is typically made of durable materials that are resistant to water and can withstand various weather conditions. By installing a water stop, the cable is protected from potential water damage, ensuring its proper functioning and longevity.Rate this question:
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- 41.
Equipment which under normal conditional has no live parts exposed
- A.
Dead front
- B.
Dead center
- C.
Dead end
- D.
Dead man carry
Correct Answer
A. Dead frontExplanation
Dead front refers to equipment that, under normal conditions, has no live parts exposed. This means that all live parts are concealed behind panels or barriers, ensuring the safety of individuals who may come into contact with the equipment. Dead center, dead end, and dead man carry do not accurately describe the concept of equipment with no live parts exposed.Rate this question:
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- 42.
What is the first consideration when choosing a transformer for use?
- A.
Primary and secondary voltage rating
- B.
Size and weight
- C.
Manufacturer and date of last test
- D.
Number of bushings
Correct Answer
A. Primary and secondary voltage ratingExplanation
When choosing a transformer for use, the first consideration is the primary and secondary voltage rating. This is because the voltage rating determines the compatibility of the transformer with the electrical system it will be connected to. The primary voltage rating indicates the voltage at which the transformer will receive power, while the secondary voltage rating indicates the voltage at which it will deliver power. Therefore, selecting a transformer with the appropriate voltage rating is crucial to ensure safe and efficient operation.Rate this question:
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- 43.
What voltage is required to force 9 amps through a resistance of 25 ohms
- A.
225
- B.
440
- C.
110
- D.
108
Correct Answer
A. 225Explanation
To calculate the voltage required to force a certain amount of current through a resistance, we can use Ohm's Law which states that V (voltage) = I (current) x R (resistance). In this case, the current is given as 9 amps and the resistance is given as 25 ohms. Plugging these values into the formula, we get V = 9 x 25 = 225 volts. Therefore, the correct answer is 225.Rate this question:
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- 44.
What is the resistance of an electric toaster drawing 8 amps at 120 volts
- A.
5 ohms
- B.
10 ohms
- C.
15 ohms
- D.
20 ohms
Correct Answer
C. 15 ohmsExplanation
The resistance of an electric device can be calculated using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is given as 120 volts and the current is given as 8 amps. So, the resistance can be calculated as 120 volts divided by 8 amps, which equals 15 ohms.Rate this question:
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- 45.
What is the approx. counter EMF of a 7200 volt transformer with no load on the secondary
- A.
7400 volts
- B.
6800 volts
- C.
7200 volts
- D.
7000 volts
Correct Answer
C. 7200 voltsExplanation
The approximate counter EMF of a transformer with no load on the secondary is equal to the primary voltage, which in this case is 7200 volts. This is because the counter EMF is equal to the primary voltage when there is no load connected to the secondary winding. Therefore, the correct answer is 7200 volts.Rate this question:
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- 46.
Do two parallel transformers share the load evenly or is it proportional to the difference in KVA size
- A.
No, the difference in KVA size affects load share
- B.
Yes, the load is shared evenly
Correct Answer
B. Yes, the load is shared evenlyExplanation
Two parallel transformers share the load evenly. This means that each transformer carries an equal portion of the total load. The load is not proportional to the difference in KVA size. Regardless of the KVA size difference between the transformers, the load is distributed equally between them.Rate this question:
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- 47.
What is the purpose of a ballast in a street light
- A.
Limit the voltage and transform the current
- B.
Limits the current and transform the voltage
- C.
Increases the current regulates voltage
- D.
Increases the voltage and regulates current
Correct Answer
B. Limits the current and transform the voltageExplanation
The purpose of a ballast in a street light is to limit the current and transform the voltage. By limiting the current, the ballast ensures that the street light operates within its designed parameters and prevents any damage that could be caused by excessive current. Additionally, the ballast transforms the voltage to match the requirements of the street light, allowing it to function properly.Rate this question:
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- 48.
What varies the ration by reducing or increasing the effective turns in the primary or secondary winding
- A.
Dynamometer
- B.
Neutral lenght
- C.
KVr rating
- D.
Tap changer
Correct Answer
D. Tap changerExplanation
A tap changer is a device that allows for the adjustment of the number of effective turns in the primary or secondary winding of a transformer. By reducing or increasing the effective turns, the tap changer can vary the ratio of the transformer. This adjustment is useful in situations where the input or output voltage needs to be changed to match the desired electrical requirements. Therefore, a tap changer is the correct answer as it directly relates to the variation of the ratio by adjusting the effective turns in the winding.Rate this question:
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- 49.
What is the turns ratio of a 7200/240 volt transformer
- A.
30:1 or 30/1
- B.
10:2 or 10/2
- C.
10:0 or 10/1
- D.
5:1 or 5/1
Correct Answer
A. 30:1 or 30/1Explanation
The turns ratio of a transformer is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding. In this case, the turns ratio is 30:1 or 30/1, which means that there are 30 turns in the primary winding for every 1 turn in the secondary winding. This ratio determines the voltage transformation between the primary and secondary sides of the transformer.Rate this question:
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- 50.
How is the turns ratio determined
- A.
By the number of turns in each of the windings
- B.
By the number of windings in the transformer
- C.
By the type of turns in the windings
- D.
By the type of windings in the transformer
Correct Answer
A. By the number of turns in each of the windingsExplanation
The turns ratio of a transformer is determined by the number of turns in each of the windings. The turns ratio is a measure of the ratio of the number of turns in the primary winding to the number of turns in the secondary winding. It determines the voltage transformation ratio between the primary and secondary sides of the transformer. By increasing or decreasing the number of turns in the windings, the turns ratio can be adjusted to achieve the desired voltage transformation. Therefore, the correct answer is "by the number of turns in each of the windings."Rate this question:
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Mar 20, 2023Quiz Edited by
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May 12, 2010Quiz Created by
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