Technical Subject Rme

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  • 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
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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

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 15. 

    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.

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  • 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.

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  • 17. 

    What is the NEW electrical engineering law?

    • RA 7920

    • RA 154

    • RA 1378

    • RA 184

    Correct Answer
    A. RA 7920
  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 23. 

    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.

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  • 24. 

    Where conductors with an ampacity higher than the ampere rating or setting of the overcurrent device are used, the __________ shall determine the circuit rating.

    • Conductor Ampacity

    • Overcurrent Device

    • Combined Rating

    • Derated Ampacity

    Correct Answer
    A. Overcurrent Device
    Explanation
    When conductors with a higher ampacity than the overcurrent device are used, the overcurrent device itself determines the circuit rating. This means that the ampere rating or setting of the overcurrent device sets the maximum current that the circuit can handle safely. The overcurrent device acts as a protective measure to prevent excessive current flow and potential damage to the conductors and equipment. Therefore, the circuit rating is determined by the overcurrent device's specifications.

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  • 25. 

    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.

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  • 26. 

    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.

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  • 27. 

    __________ 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.

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  • 28. 

    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.

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  • 29. 

    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.

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  • 30. 

    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.

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  • 31. 

     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.

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  • 32. 

    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.

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  • 33. 

    A chain wrench can be used __________. I. With one hand only II. In confined places & close to walls III. For all sizes of conduit.

    •  I & II only

    • I & III only

    • II & III only

    • I, II & III

    Correct Answer
    A. I, II & III
    Explanation
    A chain wrench can be used with one hand only, making it a convenient tool to use. It can also be used in confined places and close to walls, allowing for versatility in different working environments. Additionally, a chain wrench can be used for all sizes of conduit, making it suitable for a wide range of applications. Therefore, the correct answer is I, II & III.

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  • 34. 

    A one-quarter bend in a raceway is equivalent to an angle of __________ degrees.

    •  90

    •  45

    • 25

    • 180

    Correct Answer
    A.  90
    Explanation
    A one-quarter bend in a raceway is equivalent to an angle of 90 degrees.

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  • 35. 

    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.

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  • 36. 

    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.

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  • 37. 

    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.

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  • 38. 

    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.

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  • 39. 

     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.

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  • 40. 

    A negatively charged body has __________.

    • a. Excess of electrons

    • B. Excess of neutrons   

    • C. Deficit of electrons

    • D. Deficit of neutrons 

    Correct Answer
    A. a. Excess of electrons
    Explanation
    A negatively charged body has an excess of electrons. When an object gains electrons, it becomes negatively charged because electrons have a negative charge. Therefore, option a is the correct answer.

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  • 41. 

    A fluorescent light that blinks “on” and “off” repeatly may in time __________.

    • a. Cause the fuse to blow

    • B. Cause the switch to wear out   

    • C. Cause the wire to melt d. Result in damage to the ballast 

    • D. Result in damage to the ballast 

    Correct Answer
    A. D. Result in damage to the ballast 
    Explanation
    A fluorescent light that blinks on and off repeatedly may in time result in damage to the ballast. The ballast is responsible for regulating the electrical current flowing through the light, and the constant blinking can cause excessive stress and wear on the ballast, leading to its malfunction or damage over time.

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  • 42. 

    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.

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  • 43. 

    Of the six ways of producing emf, which method is used the least?

    • a. Pressure

    • B. Solar

    • C. Chemical reaction

    • D. Friction 

    Correct Answer
    A. D. Friction 
    Explanation
    Friction is the method used the least to produce emf. This is because frictional forces typically result in a transfer of kinetic energy into heat energy, rather than generating an electric current. The other methods mentioned, such as pressure, solar, and chemical reactions, are more commonly used to produce emf by utilizing different principles and mechanisms.

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  • 44. 

     As the power factor of a circuit is increased __________. 

    • a. Reactive power is decreased

    • B. Active power is decreased

    • C. Reactive power is increased

    • D. Both active and reactive power are increased 

    Correct Answer
    A. a. Reactive power is decreased
    Explanation
    When the power factor of a circuit is increased, it means that the circuit is becoming more efficient in converting electrical power into useful work. This is because a higher power factor indicates a lower amount of reactive power in the circuit. Reactive power is the power that is not directly used to perform work, but rather to maintain the electric and magnetic fields in inductive and capacitive elements. Therefore, when the power factor is increased, the amount of reactive power is decreased.

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  • 45. 

    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.

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  • 46. 

    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. 
  • 47. 

    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.

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  • 48. 

    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.

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  • 49. 

    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.

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  • Aug 15, 2023
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  • May 19, 2019
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    Miguel Taleon

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