Electrical Basics Quiz – Concepts, Safety & Circuits

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.

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.

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.

Light fixtures are classified based on the way they distribute light. This refers to how the light is spread or directed by the fixture. Different light fixtures have different methods of distributing light, such as downward, upward, or in multiple directions. This classification helps in choosing the right fixture for specific lighting needs or preferences.

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.

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.

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.

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.

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.

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.

The correct answer is station 30+00. This station marks the start of the strobe system.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The other panel for the airfield lights is located in the control tower.

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.

The output leads of an airfield regulator are labeled as H1 and H2.

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.

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

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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%.

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.

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.

The correct answer is N0. 4 AWG. The counterpoise used for airfield lighting circuits is typically N0. 4 AWG.

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.

The flash capacitors take 1 minute to bleed off their charge.

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.

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.

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.

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.

In order to perform a direct current (DC) hi-potential test on a high intensity runway edge circuit, the voltage value used is 5,000.

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.

The airport beacon turns at a speed of 6 revolutions per minute (RPM). This means that the beacon completes a full rotation 6 times in one minute.