Electrical Basics Quiz – Concepts, Safety & Circuits

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| By Catherine Halcomb
Catherine Halcomb
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  • 1/70 Questions

    1. Light fixtures are classified by 

    • The way they distribute light 
    • The way they are installed 
    • Their width and length 
    • Their size and weight
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About This Quiz

This Electrical Fundamentals Quiz is perfect for beginners and early-stage learners looking to strengthen their understanding of key electrical principles. Covering basic concepts such as voltage, current, resistance, simple circuits, and essential safety practices, this quiz mirrors what you’ll encounter in classroom tests and technical exams.

Ideal for engineering students, apprentices, or those prepping for certification, it’s designed to build confidence and highlight knowledge gaps before moving to advanced topics.

Disclaimer: This quiz is intended for practice and learning reinforcement. It is not affiliated with any official licensing or certification body.

Electrical Basics Quiz Concepts, Safety & Circuits - Quiz

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  • 2. 

    5. The efficiency range of a lamp is measure in lumens per 

    • Volt 

    • Ohm

    • Watt

    • Amp

    Correct Answer
    A. Watt
    Explanation
    The efficiency range of a lamp is measured in watts. Watts measure the rate at which energy is consumed or produced. In the case of a lamp, it indicates the amount of electrical power that is converted into light. The higher the wattage, the brighter the lamp will be. Therefore, measuring the efficiency of a lamp in watts allows us to understand how effectively it converts electrical energy into light.

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  • 3. 

    12. What color light is associated with high pressure sodium (HPS) lamps?

    • Violet 

    • Golden 

    • Green blue 

    • Blue white 

    Correct Answer
    A. Golden 
    Explanation
    High-pressure sodium (HPS) lamps emit a golden color light. This is because HPS lamps contain sodium vapor, which emits light in the yellow-orange spectrum when an electric current passes through it. The golden color of the light produced by HPS lamps is known for its high efficiency and is commonly used in outdoor lighting applications such as streetlights.

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  • 4. 

    22. When installing fixtures, ensure uniform lighting by 

    • Using only mercury vapor fixtures 

    • Adjusting fixtures to 5 degree from horizontal 

    • Using only high pressure sodium fixtures 

    • Adjusting fixtures so that illuminated areas overlap 

    Correct Answer
    A. Adjusting fixtures so that illuminated areas overlap 
    Explanation
    Adjusting fixtures so that illuminated areas overlap ensures uniform lighting because it helps to eliminate any dark spots or uneven lighting in the area. When fixtures are adjusted in such a way that their illuminated areas overlap, it ensures that there is a consistent distribution of light throughout the space, preventing any areas from being too bright or too dim. This technique helps to create a balanced and even lighting environment. Using only mercury vapor or high pressure sodium fixtures does not guarantee uniform lighting, as the type of fixture alone does not address the issue of overlapping illuminated areas.

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  • 5. 

    25. To prevent injury during re-lamping procedures, you must 

    • Wear leather gloves 

    • De-energize the light fixture 

    • Wear approved safety goggles 

    • Do all of the above tasks

    Correct Answer
    A. Do all of the above tasks
    Explanation
    To prevent injury during re-lamping procedures, it is necessary to do all of the above tasks. Wearing leather gloves protects the hands from potential cuts or burns. De-energizing the light fixture ensures that there is no electrical current flowing, reducing the risk of electric shock. Wearing approved safety goggles protects the eyes from any flying debris or shards that may occur during the process. By combining all these safety measures, the risk of injury during re-lamping procedures is minimized.

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  • 6. 

    38. What must be done before replacing an isolating (IL) transformer? 

    • Apply two half lapped layers of tape to the connectors 

    • Call the electrical superintendent for clearance 

    • Cut the ends off of the old IL transformer 

    • De-energize, tag, and ground the circuit

    Correct Answer
    A. De-energize, tag, and ground the circuit
    Explanation
    Before replacing an isolating (IL) transformer, the circuit must be de-energized, tagged, and grounded. This is to ensure the safety of the person replacing the transformer and to prevent any electrical accidents or hazards. De-energizing the circuit means disconnecting the power supply to the transformer, tagging it ensures that others are aware that work is being done on the circuit, and grounding the circuit helps to discharge any residual electrical energy. By following these steps, the risk of electric shock or other accidents can be minimized.

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  • 7. 

    55. What indication is considered "good" when you read across a closed switch with a voltmeter? 

    • One half output voltage

    • One half input voltage 

    • Full input voltage 

    • Zero volts

    Correct Answer
    A. Zero volts
    Explanation
    When you read across a closed switch with a voltmeter, a "good" indication would be zero volts. This means that there is no voltage drop across the closed switch, indicating that it is functioning properly and not causing any resistance or impedance in the circuit.

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  • 8. 

    60. Which approach lighting system maintenance item must be performed daily?

    • Replace gaskets 

    • Clean and polish lenses

    • Check and record burned out lamps 

    • Check and record secondary amperage readings 

    Correct Answer
    A. Check and record burned out lamps 
    Explanation
    The correct answer is to check and record burned out lamps. This maintenance item needs to be performed daily because burned out lamps can affect the effectiveness of the approach lighting system. By regularly checking and recording any burned out lamps, maintenance personnel can quickly replace them to ensure the system is functioning properly and providing adequate lighting for aircraft approaching the runway.

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  • 9. 

    69. When using radios, which two words should you use to describe circuit conditions?

    • Off/on

    • Go/no-go 

    • Open/closed

    • Inside/outside

    Correct Answer
    A. Open/closed
    Explanation
    When using radios, the words "open" and "closed" are used to describe circuit conditions. "Open" refers to a circuit that is not complete or broken, while "closed" refers to a circuit that is complete and functioning properly. These terms are commonly used in radio communication to indicate whether a circuit is operational or not.

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  • 10. 

    15. What are the two types of phase cut dimmers?

    • Forward and reverse 

    • Analog and digital

    • Positive and negative 

    • Single pole and double pole 

    Correct Answer
    A. Forward and reverse 
    Explanation
    The correct answer is "forward and reverse". Phase cut dimmers are used to control the brightness of lights by adjusting the amount of power delivered to the light source. Forward phase cut dimmers reduce the power at the beginning of each AC cycle, while reverse phase cut dimmers reduce the power at the end of each AC cycle. This subtle difference in timing allows for different types of light bulbs to be dimmed effectively.

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  • 11. 

    20. What device is used in high intensity discharge (HID) lamps to limit current as the lamp heats up? 

    • Ballast 

    • Inductor 

    • Resistor 

    • Capacitor 

    Correct Answer
    A. Ballast 
    Explanation
    A ballast is used in high intensity discharge (HID) lamps to limit the current as the lamp heats up. The ballast helps regulate the flow of electricity, preventing the lamp from drawing too much current and potentially causing damage. It also helps stabilize the voltage and provides the necessary starting voltage for the lamp to ignite. Overall, the ballast plays a crucial role in ensuring the safe and efficient operation of HID lamps.

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  • 12. 

    23. To ensure that the proper amount of light is provided after fixture installation, check the lighting with 

    • A stake 

    • A voltmeter 

    • A light meter 

    • An ohmmeter 

    Correct Answer
    A. A light meter 
    Explanation
    A light meter is used to measure the intensity of light in a given area. In the context of fixture installation, using a light meter ensures that the proper amount of light is provided. By measuring the light levels, one can determine if the installed fixtures are providing the desired amount of illumination. This helps in ensuring that the lighting conditions are suitable for the intended purpose, whether it is for a home, office, or any other space.

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  • 13. 

    30. What color is used for the taxiway edge light?

    • Yellow 

    • White 

    • Blue 

    • Red 

    Correct Answer
    A. Blue 
    Explanation
    The color used for the taxiway edge light is blue. This color is used to differentiate the taxiway from other areas of the airport and to provide guidance for pilots and ground personnel. Blue lights are typically placed along the edges of the taxiway to mark its boundaries and help pilots navigate safely.

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  • 14. 

    31. One of the main control panels for the airfield lights is in the vault; where is the other panel located? 

    • Control tower 

    • Base operations 

    • Aircraft terminal 

    • Center of the approach

    Correct Answer
    A. Control tower 
    Explanation
    The other panel for the airfield lights is located in the control tower.

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  • 15. 

    34. Which airfield vault device is used to swap location of control of the airfield lights?

    • MA-1 panel 

    • Transfer switch 

    • Pilot relay panel 

    • Circuit breaker panel 

    Correct Answer
    A. Transfer switch 
    Explanation
    A transfer switch is used to swap the location of control of the airfield lights. This device allows for the transfer of control from one location to another, ensuring that the lights can be operated from different control points as needed. The other options listed, such as the MA-1 panel, pilot relay panel, and circuit breaker panel, do not specifically serve the purpose of swapping control of the airfield lights.

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  • 16. 

    42. What occurs when the operating lamp in the airport beacon fails?

    • A buzzer is activated in the tower 

    • A signal light in the vault is activated 

    • Base operations initiates an emergency service call 

    • A reserve lamp is placed in operation automatically 

    Correct Answer
    A. A reserve lamp is placed in operation automatically 
    Explanation
    When the operating lamp in the airport beacon fails, a reserve lamp is automatically placed in operation. This ensures that the beacon continues to function properly and provides the necessary visual guidance to pilots and other aircraft personnel.

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  • 17. 

    43. What voltage is necessary to run the airport beacon? 

    • 120 volts 

    • 120/240 volts 

    • 240/416 volts 

    • 2,400 volts 

    Correct Answer
    A. 120/240 volts 
    Explanation
    The correct answer is 120/240 volts. This is because the airport beacon requires a voltage range of 120/240 volts to operate. This means that it can be powered by either a 120-volt or a 240-volt electrical system.

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  • 18. 

    46. What station marks the start of the strobe system?

    • Station 20+00

    • Station 20+10

    • Station 30+00

    • Station 30+10

    Correct Answer
    A. Station 30+00
    Explanation
    The correct answer is station 30+00. This station marks the start of the strobe system.

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  • 19. 

    54. After notifying the control tower, what should you do before working on control circuits?

    • Isolate the circuit 

    • Notify your supervisor 

    • Test the circuit with an ohmmeter 

    • Open fuse cutouts on transformer 

    Correct Answer
    A. Isolate the circuit 
    Explanation
    Before working on control circuits, it is important to isolate the circuit. This means disconnecting the circuit from the power source and ensuring that no electricity can flow through it. This is done to prevent any potential accidents or injuries while working on the circuits. By isolating the circuit, it ensures that there is no electrical current present and it is safe to proceed with any maintenance or repairs.

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  • 20. 

    57. How are animals prevented from chewing on airfield lighting fixture cords?

    • Fixtures are designed so that no cords are exposed 

    • Using a yellow colored fixture to scare them away 

    • By applying pesticides to the fixture 

    • By energizing portions of the fixture 

    Correct Answer
    A. Fixtures are designed so that no cords are exposed 
    Explanation
    Animals are prevented from chewing on airfield lighting fixture cords by designing the fixtures in a way that no cords are exposed. This means that the cords are concealed or protected within the fixture, making them inaccessible to animals.

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  • 21. 

    58. What is used to maintain contact with tower when away from the truck?

    • Runners 

    • Hand signals 

    • Hand held radios 

    • Flashlight signals

    Correct Answer
    A. Hand held radios 
    Explanation
    Hand held radios are used to maintain contact with the tower when away from the truck. This is because hand held radios provide a convenient and portable means of communication, allowing the user to transmit and receive messages from a distance. Unlike runners or hand signals, which require physical presence and may not be as effective in certain situations, hand held radios offer a reliable and efficient method of staying connected with the tower while being away from the truck. Flashlight signals, on the other hand, may not be as practical or widely used for communication purposes.

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  • 22. 

    62. Where is the precision approach path indicator (PAPI) system located?

    • Always facing north 

    • Always facing south 

    • On the left side of the runway

    • On the right side of the runway 

    Correct Answer
    A. On the left side of the runway
    Explanation
    The precision approach path indicator (PAPI) system is located on the left side of the runway. This system provides visual guidance to pilots during approach and landing by displaying a series of lights that indicate whether the aircraft is too high, too low, or on the correct glide path. Placing the PAPI system on the left side of the runway allows pilots to easily reference and align their approach with the correct glide path.

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  • 23. 

    66. What meter do you use to perform insulation resistance tests on airfield light circuits?

    • Hypot 

    • Multimeter 

    • Megohmmeter 

    • Singal generator 

    Correct Answer
    A. Megohmmeter 
    Explanation
    A megohmmeter is used to perform insulation resistance tests on airfield light circuits. This instrument measures the resistance of the insulation material between conductors, helping to identify any faults or weaknesses in the insulation. By applying a high voltage to the circuit and measuring the resulting current flow, the megohmmeter can determine the insulation resistance. This test is important for ensuring the safety and reliability of the airfield light circuits.

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  • 24. 

    68. In order to perform a direct current (DC) hi-potential test on an airfield light circuit, what do you do with the leads once you remove them from the airfield regulator? 

    • Short both leads 

    • Ground both lead 

    • Support one lead and ground the other 

    • Support both leads and keep them clear of each other and the ground 

    Correct Answer
    A. Support both leads and keep them clear of each other and the ground 
    Explanation
    Supporting both leads and keeping them clear of each other and the ground is necessary in order to perform a direct current (DC) hi-potential test on an airfield light circuit. This is important to prevent any electrical interference or short circuiting that could occur if the leads come into contact with each other or with the ground. By supporting both leads and keeping them clear, the test can be conducted accurately and safely.

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  • 25. 

    4. What is the unit of measurement for lumens per square meter? 

    • Lux

    • Foot candle 

    • Candle power

    • Meter candle 

    Correct Answer
    A. Lux
    Explanation
    Lux is the unit of measurement for lumens per square meter. Lux measures the amount of light that falls on a surface or is emitted from a source. It is commonly used to determine the brightness or intensity of light in various applications such as photography, lighting design, and scientific research. The higher the lux value, the brighter the light.

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  • 26. 

    7. What is the diameter of a T8 lamp?

    • 8/2 inch

    • 8/4 inch 

    • 8/8 inch 

    • 8/16 inch 

    Correct Answer
    A. 8/8 inch 
    Explanation
    The diameter of a T8 lamp is 8/8 inch. This means that the diameter is equal to 1 inch.

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  • 27. 

    What is used to power a light emitting diode (LED) array in a non-integrated LED fixture?

    • LED starter

    • LED driver 

    • LED ballast

    • LED transformer

    Correct Answer
    A. LED driver 
    Explanation
    An LED driver is used to power a light emitting diode (LED) array in a non-integrated LED fixture. LED drivers provide the necessary electrical current and voltage regulation to ensure proper functioning of the LED array. They convert the incoming power supply to a suitable level for the LED, protecting it from voltage fluctuations and ensuring efficient operation. LED starters, LED ballasts, and LED transformers are not typically used for powering LED arrays, making LED driver the correct answer.

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  • 28. 

    10. What is a disadvantage of high intensity discharge (HID) lamps?

    • Low lumen per watt output

    • Lamp size is large 

    • Lamp life is short 

    • Restrike time

    Correct Answer
    A. Restrike time
    Explanation
    Restrike time is a disadvantage of high intensity discharge (HID) lamps. Restrike time refers to the time it takes for the lamp to restart and reach full brightness after a power interruption or when it is switched off and then on again. HID lamps have a longer restrike time compared to other types of lamps, which can be inconvenient in situations where immediate lighting is necessary. This delay in restrike time can cause disruptions and delays in various applications, such as outdoor lighting or industrial settings, where continuous and uninterrupted lighting is required.

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  • 29. 

    13. Which type of fixture is installed by laying it into the grid of a suspended ceiling?

    • Surface mount 

    • Flush mount 

    • Wall mount 

    • Troffer 

    Correct Answer
    A. Troffer 
    Explanation
    A troffer is a type of fixture that is installed by laying it into the grid of a suspended ceiling. It is specifically designed to fit into a standard ceiling grid system and provide even lighting throughout the space. This type of fixture is commonly used in commercial buildings and offices to provide a clean and seamless appearance to the suspended ceiling while also providing efficient and uniform lighting.

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  • 30. 

    14. When installing an octagon box for a new flush mount fixture what is important to ensure that the mounting method does not fail?

    • Box is sized to support the fixture 

    • The fixture is less than 10 pounds 

    • Fixture is secured using sheetrock screws 

    • Fill capacity of the box to allow enough space for connections 

    Correct Answer
    A. Box is sized to support the fixture 
    Explanation
    To ensure that the mounting method does not fail when installing an octagon box for a new flush mount fixture, it is important to ensure that the box is sized to support the fixture. This means that the box should be able to securely hold the weight and size of the fixture without any risk of it falling or becoming unstable. The size and weight of the fixture should be taken into consideration when selecting the appropriate box to ensure a safe and secure installation.

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  • 31. 

    16. How does a phase cut dimmer operate?

    • A variable resistor is used to lower the voltage

    • Two or more resistors are used to form a voltage divider 

    • The root mean square (RMS) voltage is reduced by turning off a portion of the input waveform

    • Semi conductor switches are used to turn off only the negative portion of the input waveform

    Correct Answer
    A. The root mean square (RMS) voltage is reduced by turning off a portion of the input waveform
    Explanation
    A phase cut dimmer operates by reducing the root mean square (RMS) voltage by turning off a portion of the input waveform. This means that the dimmer cuts off a part of the waveform, resulting in a lower voltage and therefore dimming the light or reducing the power of the device being controlled.

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  • 32. 

    17. What is the light output of a fixture using a 0-10V ballast with 10 volts on the low voltage control circuit?

    • 10%

    • 50%

    • 80%

    • 100%

    Correct Answer
    A. 100%
    Explanation
    When a fixture is using a 0-10V ballast with 10 volts on the low voltage control circuit, it means that the ballast is receiving the maximum voltage input. In this case, the light output of the fixture will be at its highest level, which is 100%. Therefore, the correct answer is 100%.

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  • 33. 

    36. How are the output leads of an airfield regulator labeled?

    • X1 and X2 

    • X1 and X3

    • H1 and H2

    • H1 and H3 

    Correct Answer
    A. H1 and H2
    Explanation
    The output leads of an airfield regulator are labeled as H1 and H2.

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  • 34. 

    39. What feature is common to elevated airfield lights?

    • They use a higher wattage lamp than other lights 

    • They use a lower wattage lamp than other lights 

    • They are built with frangible construction 

    • They are sturdier than semiflush lights 

    Correct Answer
    A. They are built with frangible construction 
    Explanation
    Elevated airfield lights are built with frangible construction. Frangible construction means that the lights are designed to break or collapse upon impact, reducing the risk of damage to aircraft in the event of a collision. This feature is important for safety reasons, as it helps to minimize the potential for accidents or injuries.

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  • 35. 

    44. What device can be used to change voltage up or down for the airport beacon lamps? 

    • MA-1 panel 

    • The beacon motor's tap block 

    • The tap changer in the distrubtion transformer 

    • The constant current regulator that feeds the beacon circuit

    Correct Answer
    A. The tap changer in the distrubtion transformer 
    Explanation
    The tap changer in the distribution transformer can be used to change the voltage up or down for the airport beacon lamps. This device allows for adjusting the voltage output of the transformer to meet the specific requirements of the beacon lamps, ensuring they receive the correct voltage for optimal performance.

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  • 36. 

    47. How often does each strobe light unit flash?

    • Once each second 

    • Twice each second 

    • Once every 2 seconds 

    • Once every 4 seconds

    Correct Answer
    A. Twice each second 
    Explanation
    Each strobe light unit flashes twice each second. This means that the strobe light unit flashes two times within a one-second interval.

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  • 37. 

    53. What is indicated when two skips occur within 100 flashes of the condenser discharge system?

    • Excessive dirt accumulation on the lens

    • Overvoltage to the flasher 

    • Misaligned fixture 

    • A worn out lamp 

    Correct Answer
    A. A worn out lamp 
    Explanation
    When two skips occur within 100 flashes of the condenser discharge system, it indicates that the lamp is worn out. This means that the lamp has reached the end of its lifespan and is no longer functioning properly. As a result, it is unable to consistently produce the necessary flashes, causing the skips.

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  • 38. 

    70. Which method of troubleshooting is potentially destructive, and should not be used first? 

    • Insulation resistance testing 

    • Intentional grounding 

    • Intentional opening 

    • Cable tracing

    Correct Answer
    A. Intentional grounding 
    Explanation
    Intentional grounding is potentially destructive and should not be used as the first method of troubleshooting because it involves intentionally creating a direct connection between a live conductor and the ground, which can cause damage to the electrical system or equipment. It is a risky method that should only be used as a last resort when all other troubleshooting methods have failed.

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  • 39. 

    24. When trouble shooting a 120 volt photocell, which conductor should provided power to the light fixture?

    • Load (red) 

    • Line (black) 

    • Neutral (white)

    • None of the above 

    Correct Answer
    A. Load (red) 
    Explanation
    When troubleshooting a 120 volt photocell, the load conductor (red) should provide power to the light fixture. The load conductor carries the electrical current from the photocell to the fixture, allowing it to receive power and illuminate. The line conductor (black) carries the incoming power from the source to the photocell, while the neutral conductor (white) completes the circuit and carries the current back to the source. Therefore, the load conductor is the correct answer in this case.

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  • 40. 

    28. Which airfield fixture is unidirectional?

    • Runway centerline 

    • Taxiway edge 

    • Runway edge 

    • Approach 

    Correct Answer
    A. Approach 
    Explanation
    An approach is a unidirectional airfield fixture because it refers to the path or course that an aircraft follows when landing or approaching the runway. It is a designated route that guides the aircraft towards the runway, ensuring a safe and precise landing. Unlike the other options listed, such as the runway centerline, taxiway edge, and runway edge, which are all bidirectional and can be used for both takeoff and landing, the approach is specifically designed for landing purposes only.

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  • 41. 

    32. What should you have available if your system uses 48 volt DC control? 

    • An extra master sequence panel 

    • An extra power supply module 

    • Low burden pilot relay panel 

    • A large battery 

    Correct Answer
    A. An extra power supply module 
    Explanation
    If a system uses 48 volt DC control, it is important to have an extra power supply module available. This is because the power supply module is responsible for providing the necessary electrical power to the system. Having an extra module ensures that in case the primary power supply module fails or malfunctions, the backup module can be easily swapped in to prevent any disruption in the system's operation.

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  • 42. 

    33. The standard control cable for an airfield lighting control system has how many conductors?

    • 4

    • 5

    • 6

    • 7

    Correct Answer
    A. 7
    Explanation
    The standard control cable for an airfield lighting control system has 7 conductors. This means that the cable is designed to carry electrical signals or power through 7 separate channels or paths. Each conductor serves a specific purpose in the control system, such as transmitting signals for turning on or off the lights, adjusting their intensity, or monitoring their status. Having 7 conductors allows for the efficient and reliable operation of the airfield lighting control system.

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  • 43. 

    37. What size counterpoise is used for airfield lighting circuits?

    • N0. 4 AWG 

    • No. 2 AWG 

    • No. 1/0 AWG 

    • No. 2/0 AWG 

    Correct Answer
    A. N0. 4 AWG 
    Explanation
    The correct answer is N0. 4 AWG. The counterpoise used for airfield lighting circuits is typically N0. 4 AWG.

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  • 44. 

    40. The primary purpose of the rotating/airport beacon is to 

    • Mark the highest airfield obstruction 

    • Inform pilots of their altitude 

    • Determine visibility distances

    • Guide the pilot to the airfield 

    Correct Answer
    A. Guide the pilot to the airfield 
    Explanation
    The rotating/airport beacon is primarily used to guide the pilot to the airfield. It provides a visual reference point for pilots to locate the airfield, especially at night or during low visibility conditions. The beacon's rotating light helps pilots identify the location of the airport and align their aircraft accordingly for landing.

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  • 45. 

    52. How long does it take the flash capacitors to bleed off their charge?

    • 1 second 

    • 1 minute 

    • 30 seconds 

    • 30 minutes 

    Correct Answer
    A. 1 minute 
    Explanation
    The flash capacitors take 1 minute to bleed off their charge.

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  • 46. 

    63. What occurs when a precision approach path indicator (PAPI) unit gets misaligned by more than 1/2 degree up or 1 degree down? 

    • A buzzer sounds in the tower cab 

    • A tilt switch opens the entire circuit 

    • A warning light is turned on at the unit 

    • A warning light is turned on at the vault 

    Correct Answer
    A. A tilt switch opens the entire circuit 
    Explanation
    When a precision approach path indicator (PAPI) unit gets misaligned by more than 1/2 degree up or 1 degree down, a tilt switch opens the entire circuit. This means that the circuit is interrupted and no power is supplied to the PAPI unit. This helps to ensure that pilots receive accurate visual guidance during their approach, as a misaligned PAPI unit could lead to incorrect altitude indications.

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  • 47. 

    65. When you tie together two airfield lights circuits for emergency operation, what do you do to prevent regulator overload?

    • Increase regulator current output 

    • Remove every third airfield light from the new circuit 

    • Move the control wire from step 5 relay to step 4 relay

    • Parallel the two circuits before you connect them to the regulator 

    Correct Answer
    A. Move the control wire from step 5 relay to step 4 relay
    Explanation
    When you tie together two airfield lights circuits for emergency operation, moving the control wire from the step 5 relay to the step 4 relay is done to prevent regulator overload. By doing so, the load on the regulator is distributed evenly between the two circuits, ensuring that the regulator does not become overloaded. This helps maintain the stability and functionality of the emergency lighting system during operation.

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  • 48. 

    2. Which light classification directs from 40 to 60 percent of its light upward above the area to be lighted?

    • Indirect 

    • Semi direct 

    • Semi indirect 

    • General diffusing

    Correct Answer
    A. General diffusing
    Explanation
    The correct answer is general diffusing. General diffusing light classification directs from 40 to 60 percent of its light upward above the area to be lighted. This means that the majority of the light is directed upwards, creating a soft and evenly distributed illumination in the space. Unlike other classifications like indirect, semi direct, and semi indirect, general diffusing provides a balanced lighting effect without causing glare or harsh shadows.

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  • 49. 

    3. Which classification of light fixture directs all its light so that the entire ceiling and upper side walls become the light source?

    • Indirect 

    • Semi direct 

    • Semi indirect 

    • General diffusing

    Correct Answer
    A. Indirect 
    Explanation
    An indirect light fixture directs all its light upwards towards the ceiling and upper side walls, causing them to become the primary source of light in the room. This type of lighting creates a soft and diffused illumination that helps to evenly distribute light throughout the space without creating harsh shadows or glare.

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  • Current Version
  • Jun 25, 2025
    Quiz Edited by
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  • Apr 06, 2020
    Quiz Created by
    Catherine Halcomb
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