Technical Subject Rme

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Miguel Taleon
M
Miguel Taleon
Community Contributor
Quizzes Created: 1 | Total Attempts: 2,175
| Attempts: 2,175
Quiz Flashcard
SettingsSettings
Please wait...
  • 1/224 Questions

    A type of single phase motor that can be operated on either AC or DC is a ___________ motor. 

    • Multispeed
    • Capacitor-start
    • Universal
    • Repulsion-induction
Please wait...
About This Quiz

This TECHNICAL SUBJECT RME quiz assesses knowledge of electrical vaults, including fire ratings, slab thicknesses, and safety distances for various voltage levels. It is designed for learners in electrical engineering, focusing on essential safety and construction standards.

Technical Subject Rme - Quiz

Quiz Preview

  • 2. 

    The instrument used to indicate phase relation between current and voltage is the __________.

    • Megger

    • Power Factor Meter

    • Voltmeter

    • Galvanometer

    Correct Answer
    A. Power Factor Meter
    Explanation
    A power factor meter is used to indicate the phase relation between current and voltage. It measures the power factor, which is the ratio of real power to apparent power in an electrical circuit. By measuring the power factor, the meter can determine whether the current and voltage are in phase (leading or lagging) or out of phase. This information is crucial in assessing the efficiency and performance of electrical systems, as well as identifying any power factor correction measures that may be required. A power factor meter is specifically designed for this purpose, making it the correct instrument for indicating phase relation between current and voltage.

    Rate this question:

  • 3. 

    To calculate the VA, one needs to know the __________.

    • Voltage and current

    • Impedance and conductance

    • Resistance and impedance

    • Ohms and resistance

    Correct Answer
    A. Voltage and current
    Explanation
    To calculate the VA (volt-ampere), which is a unit used to measure apparent power in an electrical circuit, one needs to know the voltage and current. The VA is calculated by multiplying the voltage and current together. This is because the apparent power is the product of the voltage and current in an AC circuit, taking into account the phase difference between them. Therefore, knowing the voltage and current values is essential for accurately calculating the VA.

    Rate this question:

  • 4. 

    Motors 1/3, 1/4, and 1/8 hp are connected parallel. Those motors deliver a total of ___________.

    • 1 hp

    • 7/8 hp

    • 17/24 hp

    • 0.07 hp

    Correct Answer
    A. 17/24 hp
    Explanation
    When motors are connected in parallel, their power outputs are added together. In this case, the motors have power ratings of 1/3, 1/4, and 1/8 hp. Adding these fractions together, we get a total power output of 17/24 hp.

    Rate this question:

  • 5. 

    A circuit breaker that has purposely introduced a delay in the tripping action and which delay decreases as the magnitude of the current increases is a __________ circuit breaker.

    • Inverse Time

    • Option 2

    • Option 3

    • Option 4

    Correct Answer
    A. Inverse Time
    Explanation
    An inverse time circuit breaker purposely introduces a delay in the tripping action, and this delay decreases as the magnitude of the current increases. This means that the circuit breaker will trip faster for higher currents and slower for lower currents. This type of circuit breaker is designed to provide better protection for higher current faults while allowing for temporary overloads.

    Rate this question:

  • 6. 

    One million volts can also expressed as __________. 

    • A. 1 millivolt

    • B. 1 kilovolt

    • c. 1 megavolt

    • D. 1 microvolt 

    Correct Answer
    A. c. 1 megavolt
    Explanation
    One million volts can also be expressed as 1 megavolt.

    Rate this question:

  • 7. 

    14. A dynamo is __________. 

    • A. A pole line insulator.

    • B. A tool used to test dielectric strength. 

    • C. A meter used for checking the R.P.M of a motor. 

    • D. A machine for converting mechanical energy into electrical energy. 

    Correct Answer
    A. D. A machine for converting mechanical energy into electrical energy. 
    Explanation
    A dynamo is a machine that converts mechanical energy into electrical energy. It does this through the process of electromagnetic induction, where a rotating coil of wire (the armature) is placed within a magnetic field. As the coil spins, it cuts through the lines of magnetic flux, generating an electric current. This current can then be used to power electrical devices or stored in batteries. Therefore, option d is the correct answer as it accurately describes the function of a dynamo.

    Rate this question:

  • 8. 

    22. A laminated pole is __________. 

    • A. One built up of layers or iron sheets, stamped from sheet metal and insulated.

    • B. Used in transmission lines over 100kv. 

    • C. A pole soaked in creosote.   

    • D. Found in the western part of the U.S.A. 

    Correct Answer
    A. A. One built up of layers or iron sheets, stamped from sheet metal and insulated.
    Explanation
    A laminated pole refers to a pole that is constructed by layering or stacking iron sheets that have been stamped from sheet metal. These layers are then insulated, resulting in a pole that is sturdy and resistant to electrical conductivity. This type of pole is commonly used in various applications, including electrical transmission lines.

    Rate this question:

  • 9. 

    Permeability is __________.

    • The opposite of conductance.

    • A measure of the ease with which magnetism passes through any substance.

    • The total resistance to current flow.

    • The liquid substance in a battery.

    Correct Answer
    A. A measure of the ease with which magnetism passes through any substance.
    Explanation
    Permeability is a measure of the ease with which magnetism passes through any substance. It quantifies how easily a material can be magnetized and how it can conduct magnetic flux. It is a fundamental property of materials that determines their response to magnetic fields. High permeability materials allow magnetic fields to pass through them easily, while low permeability materials resist the flow of magnetic fields. Therefore, the correct answer is that permeability is a measure of the ease with which magnetism passes through any substance.

    Rate this question:

  • 10. 

    In solving series-parallel circuits, generally you would __________.

    • Treat it as a series circuit

    • Assume that all loads are equal

    • Reduce it to its simplest form

    • Treat it as a parallel circuit.

    Correct Answer
    A. Reduce it to its simplest form
    Explanation
    In solving series-parallel circuits, it is generally recommended to reduce the circuit to its simplest form. This involves simplifying the circuit by combining resistors in series and parallel until only one equivalent resistance remains. By reducing the circuit to its simplest form, it becomes easier to analyze and calculate the total current, voltage, and power in the circuit. This simplification process allows for a more straightforward and efficient solution to the circuit.

    Rate this question:

  • 11. 

    A commutator is __________.

    • A ditching machine

    • The inter-poles of a generator

    • A device for causing the alternating currents generated in the armature to flow in the same direction in the external circuit.

    • A transformer with a common conductor.

    Correct Answer
    A. A device for causing the alternating currents generated in the armature to flow in the same direction in the external circuit.
    Explanation
    A commutator is a device for causing the alternating currents generated in the armature to flow in the same direction in the external circuit. This is achieved by reversing the direction of the current in the armature coil at the appropriate moment, ensuring that the current flows in the desired direction in the external circuit. The commutator consists of a set of copper segments that are connected to the armature coils and a set of brushes that make contact with the segments. As the armature rotates, the brushes make contact with different segments, reversing the current flow and ensuring a continuous flow of current in the external circuit.

    Rate this question:

  • 12. 

    The symbol for a wye connection is __________.

    • Σ

    • Δ

    • �

    • Y

    Correct Answer
    A. Y
    Explanation
    The symbol for a wye connection is represented by the letter "y". This symbol is used to indicate a specific type of electrical connection where three elements or branches are connected in a triangular shape, resembling the letter "y". The wye connection is commonly used in electrical circuits to distribute power or connect three-phase systems.

    Rate this question:

  • 13. 

    Electricians should be familiar with the rules and regulations of their job mainly to  __________.

    •  Eliminate overtime

    • Increase wages

    • Perform their duties properly

    • Save time

    Correct Answer
    A. Perform their duties properly
    Explanation
    Electricians should be familiar with the rules and regulations of their job mainly to perform their duties properly. Understanding the rules and regulations ensures that electricians adhere to safety protocols and guidelines, reducing the risk of accidents and hazards. It also ensures that they are knowledgeable about the correct procedures and standards to follow, resulting in efficient and effective work. By performing their duties properly, electricians can provide high-quality service, maintain professionalism, and ensure customer satisfaction.

    Rate this question:

  • 14. 

    To determine if the raceway is truly vertical an electrician would use a __________.

    • Plumb bob

    • Transmit level

    • Square

    • Level

    Correct Answer
    A. Level
    Explanation
    To determine if the raceway is truly vertical, an electrician would use a level. A level is a tool that has a bubble in a liquid-filled tube, which helps determine if a surface is perfectly horizontal or vertical. By placing the level against the raceway, the electrician can check if it is straight up and down, ensuring that it is indeed vertical.

    Rate this question:

  • 15. 

    What is the NEW electrical engineering law?

    • RA 7920

    • RA 154

    • RA 1378

    • RA 184

    Correct Answer
    A. RA 7920
  • 16. 

    Frequency is measured in __________. 

    • a. Hertz

    • B. Voltage

    • C. RPM

    • D. Foot pounds 

    Correct Answer
    A. a. Hertz
    Explanation
    Frequency is a measure of how often an event occurs in a given time period. It is commonly used to measure the number of cycles or vibrations per second in a wave or oscillation. The unit used to measure frequency is Hertz (Hz). Hertz is defined as one cycle per second, indicating the number of occurrences of an event in one second. Therefore, the correct answer is a. Hertz.

    Rate this question:

  • 17. 

    Over 1000v, what is the distance from fence to live parts with nominal voltage 13,800v - 230,000v

    • 4.57m

    • 3.05m

    • 5.49m

    • 6.25m

    Correct Answer
    A. 4.57m
    Explanation
    The correct answer is 4.57m. This distance is the minimum required clearance between the fence and the live parts with a nominal voltage range of 13,800v to 230,000v. It ensures the safety of individuals and prevents any potential electrical hazards.

    Rate this question:

  • 18. 

    The electromotive force required to cause a current to flow may be obtained __________. I. Thermally II. Mechanically III. Chemically 

    • A. I only

    • B. I & III only

    • C. II & III only

    • D. I, II, & III

    Correct Answer
    A. D. I, II, & III
    Explanation
    The correct answer is d. I, II, & III. The electromotive force required to cause a current to flow can be obtained through various means. Thermally, it can be obtained through the temperature difference between two points in a thermocouple. Mechanically, it can be obtained through the motion of a magnet in a generator. Chemically, it can be obtained through chemical reactions in a battery. Therefore, all three options are valid ways to obtain the electromotive force required to cause a current to flow.

    Rate this question:

  • 19. 

    For screw shell devices with attached leads, the conductor attached to the screw shell shall be ________ in color. 

    • White or gray

    • Orange

    • Green

    • Black

    Correct Answer
    A. White or gray
    Explanation
    The conductor attached to the screw shell of a device should be white or gray in color. This is because white or gray is the standard color coding for neutral or grounded conductors in electrical wiring. By using white or gray, it helps to ensure consistency and proper identification of the neutral conductor, which is an important safety measure in electrical installations.

    Rate this question:

  • 20. 

    Raceways or cable trays containing electric conductors shall not contain ___________. I. Pipe for steam II. Tube for air III. Pipe for water

    • I only

    • II only

    • III only

    • I, II, & III

    Correct Answer
    A. I, II, & III
    Explanation
    Raceways or cable trays containing electric conductors should not contain any pipes or tubes for steam, air, or water. This is because having these pipes or tubes within the raceways or cable trays can lead to potential hazards such as heat transfer, condensation, or leakage, which can damage the electric conductors and pose a risk of electrical shock or fire. Therefore, all options I, II, and III are correct.

    Rate this question:

  • 21. 

    The force which moves electrons from atom to atom through a closed conducting path is called ___________.

    • Flux

    • Resistance

    • Admittance

    • EMF

    Correct Answer
    A. EMF
    Explanation
    EMF stands for electromotive force, which is the force that moves electrons from atom to atom through a closed conducting path. It is responsible for the flow of electric current in a circuit. EMF can be generated by a battery or a power source and is measured in volts.

    Rate this question:

  • 22. 

    A resistor has an indicated tolerance error of 10%. With a value of 1000 ohms, the minimum resistance the resistor may have is _________.

    • 1,100 ohms

    • 990 ohms

    • 910 ohms

    • 900 ohms

    Correct Answer
    A. 900 ohms
    Explanation
    The indicated tolerance error of 10% means that the actual resistance of the resistor can vary by 10% from the indicated value. Since the indicated value is 1000 ohms, the minimum resistance the resistor may have is 1000 ohms - (10% of 1000 ohms) = 1000 ohms - 100 ohms = 900 ohms.

    Rate this question:

  • 23. 

    A type of AC motor that runs at a constant speed and is used for such purposes as an electric clock motor is a __________ motor.

    • AC Squirrel Cage

    • AC Induction

    • Wound-rotor induction

    • Synchronous

    Correct Answer
    A. Synchronous
    Explanation
    A synchronous motor is a type of AC motor that runs at a constant speed, making it ideal for applications where precise timing is required, such as electric clock motors. Unlike other types of AC motors, a synchronous motor operates at a fixed speed that is synchronized with the frequency of the AC power supply. This makes it highly accurate and reliable for timekeeping purposes.

    Rate this question:

  • 24. 

    __________ raceways are not suitable to enclose conductors that are subject to physical damage.

    • Rigid metal conduit

    • Intermediate metal conduit

    • PVC Schedule 40

    • PVC Schedule 80

    Correct Answer
    A. PVC Schedule 40
    Explanation
    PVC Schedule 40 raceways are not suitable to enclose conductors that are subject to physical damage because they are not as durable or strong as the other options listed. Rigid metal conduit and intermediate metal conduit are made of stronger materials and can provide better protection for the conductors. PVC Schedule 80 is also a stronger option compared to Schedule 40. Therefore, PVC Schedule 40 is the least suitable choice for enclosing conductors that may be exposed to physical damage.

    Rate this question:

  • 25. 

    It is generally not good practice to supply lights and motors from the same circuit because __________.

    • Lamps for satisfactory service must operate within closer voltage limits than motors.

    • Overloads and short circuits are more common on motor circuits.

    • When motors are started, the large starting current causes a voltage drop on the circuit and the lights will blink or burn dim.

    • All of these

    Correct Answer
    A. All of these
    Explanation
    It is generally not good practice to supply lights and motors from the same circuit because all of the given reasons are valid. Lamps require a more stable voltage supply and operate within closer voltage limits compared to motors. Motor circuits are more prone to overloads and short circuits. When motors are started, the large starting current can cause a voltage drop on the circuit, resulting in the lights blinking or burning dim. Therefore, considering all these factors, it is generally not recommended to supply lights and motors from the same circuit.

    Rate this question:

  • 26. 

     Electrical appliances are connected in parallel because it __________.

    • a. Makes the operation of appliances independent of each other 

    • B. Results in reduced power loss 

    • C. Is a simple circuit   

    • D. Draws less current 

    Correct Answer
    A. a. Makes the operation of appliances independent of each other 
    Explanation
    Electrical appliances are connected in parallel because it allows each appliance to operate independently of the others. This means that if one appliance fails or is turned off, the others can still function without any interruption. In a parallel circuit, the voltage across each appliance remains the same, while the current is divided among the appliances. This ensures that each appliance receives the necessary voltage and can operate at its own required power level.

    Rate this question:

  • 27. 

    A value assigned to a circuit or system for the purpose of conveniently designating its voltage class is __________.

    • Nominal Voltage

    • Voltage to Ground

    • Voltage (of a circuit)

    • Voltage^2

    Correct Answer
    A. Nominal Voltage
    Explanation
    The term "nominal voltage" refers to a value that is assigned to a circuit or system for the purpose of conveniently designating its voltage class. This value is used as a reference or standard value to represent the voltage level of the circuit or system. It is important to note that the nominal voltage may not always be the actual voltage present in the circuit, as there can be variations and fluctuations in the actual voltage. However, the nominal voltage provides a convenient way to categorize and classify circuits or systems based on their voltage levels.

    Rate this question:

  • 28. 

    The output of a 3∅ transformer is measured in units called __________.

    • a. Watts

    • B. Volt-amps

    • C. Impedance

    • Option 4

    Correct Answer
    A. B. Volt-amps
    Explanation
    The output of a 3-phase transformer is measured in units called volt-amps (VA). Watts measure the real power in an electrical circuit, but volt-amps take into account both the real power and reactive power. Impedance is a measure of the opposition to the flow of alternating current in a circuit. Therefore, the correct answer is b. Volt-amps.

    Rate this question:

  • 29. 

    Three horsepower is equivalent to __________.

    • A. 764

    • B. 2292

    • C. 2238 watts 746 x 3 hp = 2238 

    • D. None of these

    Correct Answer
    A. C. 2238 watts 746 x 3 hp = 2238 
    Explanation
    Three horsepower is equivalent to 2238 watts. This can be calculated by multiplying the number of horsepower (3) by the conversion factor of 746 watts per horsepower. Thus, 3 horsepower x 746 watts/horsepower = 2238 watts.

    Rate this question:

  • 30. 

    In a 3∅ circuit, how many electrical degrees separate each phase? 

    • A. 360

    • B.180

    • C. 120

    • D. 90

    Correct Answer
    A. C. 120
    Explanation
    In a 3-phase circuit, each phase is separated by 120 electrical degrees. This means that the phase angles of the three phases are evenly spaced apart by 120 degrees. This is a characteristic of a balanced 3-phase system, where the power is distributed equally among the three phases.

    Rate this question:

  • 31. 

     The definition of ambient temperature is __________. 

    • a. The temperature of the conductor 

    • b. The insulation rating of the conductor 

    • c. The temperature of the area surrounding the conductor   

    • D. The maximum heat the insulation can be used within 

    Correct Answer
    A. c. The temperature of the area surrounding the conductor   
    Explanation
    The correct answer is c. The temperature of the area surrounding the conductor. Ambient temperature refers to the temperature of the surrounding environment or the area in which the conductor is located. It is important to consider the ambient temperature when dealing with conductors or any other electrical equipment as it can affect their performance and safety.

    Rate this question:

  • 32. 

    What is the formula to find watt hours?

    • A. E x T x 1000

    • B. E x I x T

    • C. I x E x T/1000

    • D. E x T x 1000

    Correct Answer
    A. B. E x I x T
    Explanation
    The formula to find watt hours is E x I x T, where E represents the voltage or electric potential difference in volts, I represents the current in amperes, and T represents the time in hours. This formula calculates the energy consumed or produced in a given period of time.

    Rate this question:

  • 33. 

    3. Resistance opposes the flow of current in a circuit and is measured in __________.

    • A. Farads

    • B. Joules

    • C. Ohms

    • D. Henrys 

    Correct Answer
    A. C. Ohms
    Explanation
    Resistance is a property of a material that opposes the flow of electric current. It is measured in ohms. Ohms is the unit of electrical resistance, named after the German physicist Georg Simon Ohm. Farads measure capacitance, joules measure energy, and henrys measure inductance.

    Rate this question:

  • 34. 

    Special permission is __________. 

    • a. Granted by the electrical foreman on the job. 

    • B. Verbal permission by the inspector. 

    • C. Given only once on one blueprint change request. 

    • D. The written consent of the authority having jurisdiction. 

    Correct Answer
    A. D. The written consent of the authority having jurisdiction. 
  • 35. 

    The electric pressure of a circuit would be the __________.

    • Voltage

    • Amperage

    • Resistance

    • Wattage

    Correct Answer
    A. Voltage
    Explanation
    The electric pressure of a circuit is measured in voltage. Voltage represents the potential difference between two points in a circuit and determines the force with which electric charges flow. It is responsible for driving the current through the circuit. Amperage, resistance, and wattage are related to voltage but do not directly measure the electric pressure in a circuit.

    Rate this question:

  • 36. 

    To sharpen an electrician’s knife, you would use a __________ stone.

    • Rubber

    • Carborundum

    • Rosin

    •  Bakelite

    Correct Answer
    A. Carborundum
    Explanation
    Carborundum is a type of abrasive material commonly used for sharpening tools and knives. It is a very hard substance made of silicon carbide, which is effective in removing material and creating a sharp edge on the blade. Rubber, rosin, and bakelite are not suitable materials for sharpening knives as they do not have the necessary abrasive properties.

    Rate this question:

  • 37. 

    When drilling into a steel I-beam, the most likely cause for breaking a drill bit would be  __________. 

    • The drill bit is too dull

    • Too slow a drill speed

    • Too much pressure on the bit

    • Too much cutting oil on bit

    Correct Answer
    A. Too much pressure on the bit
    Explanation
    Applying excessive pressure on the drill bit while drilling into a steel I-beam can cause it to break. Steel is a hard material, and using too much force can cause the drill bit to snap or fracture. It is important to apply consistent and controlled pressure while drilling to avoid damaging the bit and achieving successful drilling results.

    Rate this question:

  • 38. 

    For electrical vault, what is the minimum thickness of the floor slab?

    • 125mm

    • 100mm

    • 150mm

    • 90mm

    Correct Answer
    A. 100mm
    Explanation
    The minimum thickness of the floor slab for an electrical vault is 100mm. This thickness is necessary to provide adequate strength and support for the vault, ensuring that it can withstand the weight of equipment and any potential loads or stresses. A thicker floor slab would be even stronger, but the minimum requirement is 100mm to meet the necessary structural requirements.

    Rate this question:

  • 39. 

    How many set of plans are required to secure an electrical permit?

    • 5

    • 4

    • Option 3

    • Option 4

    Correct Answer
    A. 5
    Explanation
    An electrical permit typically requires five sets of plans to be submitted. Each set of plans is reviewed by different departments or agencies involved in the permitting process, such as the electrical, building, and fire departments. Having multiple sets of plans allows each department to review the plans simultaneously, expediting the permitting process.

    Rate this question:

  • 40. 

    Over 1000v, what is the distance from fence to live parts with nominal voltage over 230,000

    • 5.50m

    • 5.48m

    • 5.49m

    • 5.51m

    Correct Answer
    A. 5.49m
    Explanation
    The correct answer is 5.49m. This suggests that the distance from the fence to the live parts with a nominal voltage over 230,000 is 5.49 meters.

    Rate this question:

  • 41. 

    A switch when intended for isolating an electric circuit from the source of power that has no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means is a/an ___________. 

    • Isolating Switch

    • Bypass Isolation Switch

    • General Use Switch

    • Transfer Switch

    Correct Answer
    A. Isolating Switch
    Explanation
    An isolating switch is designed to disconnect an electric circuit from the power source. It does not have an interrupting rating, meaning it is not intended to interrupt the flow of current. Instead, it is meant to be operated only after the circuit has already been opened by another means, such as a circuit breaker. This ensures that the circuit is fully disconnected before the isolating switch is used. Therefore, the correct answer is Isolating Switch.

    Rate this question:

  • 42. 

    After cutting conduit, to remove the rough edges on both ends, the conduit ends should be

    • Sanded

    • Shaped

    • Burnished

    • Ground

    Correct Answer
    A. Burnished
    Explanation
    To remove the rough edges on both ends of the conduit after cutting, the conduit ends should be burnished. Burnishing is a process of smoothing and polishing a surface by applying pressure and friction. This technique helps to create a smooth and even finish on the conduit ends, ensuring that there are no sharp or jagged edges that could cause injury or damage to the wires or cables that will be inserted into the conduit.

    Rate this question:

  • 43. 

    You have an adjustable trip coil rated at 5 amps on a 200-amp switch. If you want to switch to trip at 120amps, the trip coil should be set at __________.

    • 2 amps

    • 3 amps

    • 4 amps

    • 5 amps

    Correct Answer
    A. 3 amps
    Explanation
    The adjustable trip coil is rated at 5 amps, but the switch needs to trip at 120 amps. To achieve this, the trip coil should be set at 3 amps. This means that when the current reaches 3 amps, the trip coil will activate and cause the switch to trip, effectively protecting the circuit from excessive current flow.

    Rate this question:

  • 44. 

    Flexible cords and cables shall not be used

    • For wiring of cranes and hoists

    • For prevention of the transmission of noise or vibration

    • To run through holes in floors

    • Simply to facilitate frequent interchange

    Correct Answer
    A. To run through holes in floors
    Explanation
    Flexible cords and cables should not be used to run through holes in floors. This is because flexible cords and cables are not designed to withstand the wear and tear that can occur when they are run through holes in floors. The constant movement and rubbing against the edges of the hole can cause damage to the cords and cables, increasing the risk of electrical hazards such as short circuits or exposed wires. Therefore, it is important to use appropriate wiring methods and materials that are specifically designed for running through holes in floors to ensure safety and prevent potential accidents.

    Rate this question:

  • 45. 

    A voltage or current that is reversed at regular intervals is called __________ voltage or current. I. Direct II. Steady state III. Sinusoidal

    • I only

    • II only

    • III only

    • None of these

    Correct Answer
    A. III only
    Explanation
    A voltage or current that is reversed at regular intervals is called sinusoidal voltage or current. This is because sinusoidal waveforms have a characteristic pattern of oscillation where the voltage or current changes direction periodically. Direct voltage or current does not reverse, and steady state refers to a condition where the voltage or current remains constant without any changes. Therefore, only sinusoidal voltage or current fits the description given in the question.

    Rate this question:

  • 46. 

    The grounded conductor would connect to the __________ of a lampholder.

    • A. Screw shell 410-23

    • B. Filament

    • C. Base contact

    • D. Lead in wire

    Correct Answer
    A. A. Screw shell 410-23
    Explanation
    The grounded conductor would connect to the screw shell of a lampholder. The screw shell is typically made of metal and is connected to the neutral or grounded wire in the electrical circuit. This connection ensures that any excess electrical current flows safely to the ground, protecting the user from electric shocks. The screw shell also provides a secure and stable connection for the lamp bulb, allowing it to be properly powered and illuminated.

    Rate this question:

  • 47. 

    The transferring of electrons from one material to another would be __________.

    • Electrochemistry

    • Static electricity

    • Solar electricity

    • Piezoelectricity

    Correct Answer
    A. Static electricity
    Explanation
    The transferring of electrons from one material to another refers to the phenomenon of static electricity. Static electricity occurs when there is an imbalance of electric charges on the surface of objects, causing the transfer of electrons. This can happen through friction, contact, or induction. Electrochemistry, solar electricity, and piezoelectricity involve different processes and mechanisms for the generation or transfer of electric charges, but they are not specifically related to the transferring of electrons between materials.

    Rate this question:

  • 48. 

    A transformer has a primary voltage of 120v and a secondary voltage of 480v. If there are 40 turns on the primary, the secondary contains ________.

    • 10 turns

    • 40 turns

    • 120 turns

    • 160 turns

    Correct Answer
    A. 160 turns
    Explanation
    The turns ratio of a transformer is equal to the ratio of the number of turns on the primary coil to the number of turns on the secondary coil. In this case, the primary voltage is 120v and the secondary voltage is 480v, which means the turns ratio is 480/120 = 4. Since there are 40 turns on the primary, the number of turns on the secondary can be calculated by multiplying the turns ratio by the number of turns on the primary: 4 * 40 = 160 turns.

    Rate this question:

  • 49. 

    A premises wiring system whose power is derived from a source such as a transformer that has no direct connection to the supply conductors originating in another system is a/an __________ system.

    • Integrated

    • Separately Derived

    • Interactive

    • Isolated

    Correct Answer
    A. Separately Derived
    Explanation
    A premises wiring system that is separately derived means that its power is obtained from a source, such as a transformer, that is not directly connected to the supply conductors of another system. This type of system is independent and does not rely on the main power supply, making it separate and distinct from other systems in the premises.

    Rate this question:

Quiz Review Timeline (Updated): Aug 15, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Aug 15, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 19, 2019
    Quiz Created by
    Miguel Taleon
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.