Security Alarm Installer Quiz

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  • 1/109 Questions

    According to workers compensation, anyone can work on an energized circuit

    • True
    • False
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About This Quiz

Here is a Security alarm installer quiz for you. This quiz has multiple questions that revolve around the topic of security alarm installer. This quiz is going to give you a glimpse of your understanding as well as you will return with extra knowledge than you came with. Read all of these questions carefully, and select the answer, which best suits the question. Best of luck with the test, and enjoy it!

Security Alarm Installer Quiz - Quiz

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  • 2. 

    If working on energized electrical circuits you must

    • Wear approved footwear

    • Use an approver ladder

    • Only use approved tools

    • Be qualified and authorized

    Correct Answer
    A. Be qualified and authorized
    Explanation
    To work on energized electrical circuits, it is crucial to be qualified and authorized. This means having the necessary knowledge, skills, and training to safely handle electrical equipment and circuits. Working on energized circuits without proper authorization and qualification can be extremely dangerous and may lead to electrical shock, burns, or even death. It is important to follow safety protocols and only allow qualified and authorized individuals to work on energized electrical circuits to minimize the risk of accidents and ensure the safety of everyone involved.

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  • 3. 

    Is it permissible to run security wire through the same hole as 120V wiring?

    • Yes

    • No

    Correct Answer
    A. No
    Explanation
    Running security wire through the same hole as 120V wiring is not permissible. Mixing low voltage security wire with high voltage wiring can pose significant safety risks. The high voltage can cause interference or damage to the security wire, compromising its functionality. Additionally, it can create a fire hazard or risk of electric shock. It is essential to keep low voltage wiring separate from high voltage wiring to ensure the safety and proper functioning of both systems.

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  • 4. 

    A smoke detector is considered a

    • Replaceable device

    • Four wire device

    • Better than a heat detector

    • Life safety device

    Correct Answer
    A. Life safety device
    Explanation
    A smoke detector is considered a life safety device because it is designed to detect the presence of smoke in order to provide early warning of a potential fire. Its purpose is to alert individuals in the vicinity, allowing them to evacuate the area and seek safety before the fire spreads. Smoke detectors are crucial in preventing injuries and fatalities caused by fires, making them an essential component of any building's safety system.

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  • 5. 

    During a pre-wire, an alarm technician is allowed to drill through engineered or structured beams

    • True

    • False

    Correct Answer
    A. False
    Explanation
    During a pre-wire, an alarm technician is not allowed to drill through engineered or structured beams. This is because these beams are specifically designed to provide structural support and drilling through them can weaken the overall integrity of the building. The technician must find alternative ways to route the wiring without compromising the structural integrity of the beams.

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  • 6. 

    In AC circuits, the unit Hz refers to

    • Power used

    • RMS voltage

    • Frequency of a signal

    • Peak signal voltage

    Correct Answer
    A. Frequency of a signal
    Explanation
    The unit Hz refers to the frequency of a signal in AC circuits. Hz stands for Hertz, which is the unit of measurement for frequency. Frequency represents the number of cycles or oscillations that occur in one second. In AC circuits, the frequency of the signal determines the rate at which the current alternates direction. It is an important parameter in AC circuits as it affects various aspects such as the behavior of capacitors and inductors, the efficiency of power transmission, and the performance of electrical devices.

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  • 7. 

    A diode is a device which

    • Stores electrical energy

    • Allows current to flow in one direction

    • Filters out unwanted noise

    • Converts DC to AC

    Correct Answer
    A. Allows current to flow in one direction
    Explanation
    A diode is a device that allows current to flow in one direction. This is because it is designed with a p-n junction, which acts as a one-way gate for electrical current. When the diode is forward-biased, meaning the positive voltage is applied to the p-side and the negative voltage to the n-side, it allows current to flow freely. However, when the diode is reverse-biased, it acts as an insulator and prevents current flow. Therefore, the correct answer is that a diode allows current to flow in one direction.

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  • 8. 

    Electrostatic discharge can damage most modern electronic circuits

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Electrostatic discharge (ESD) refers to the sudden flow of electricity between two objects with different electric potentials. This discharge can cause damage to electronic circuits by exceeding their voltage tolerance levels. Most modern electronic circuits are designed to be sensitive and can be easily damaged by ESD. Therefore, it is true that electrostatic discharge can damage most modern electronic circuits.

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  • 9. 

    True or false, on a two storey wood frame building it is required to cap or plug unused conduit that would allow the passage of fire or smoke between the first and second floor?

    • True

    • False

    Correct Answer
    A. True
    Explanation
    On a two storey wood frame building, it is necessary to cap or plug unused conduit that would allow the passage of fire or smoke between the first and second floor. This is important for fire safety measures as it helps prevent the spread of fire and smoke between the floors, reducing the potential damage and danger to occupants. Capping or plugging the unused conduit ensures that there are no open pathways for fire or smoke to travel through, maintaining the integrity of the building's fire protection system.

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  • 10. 

    A "Pet Alley" is a section of the protection pattern, which has been masked to allow the movement of a small animal

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A "Pet Alley" is a designated area within a protection pattern that is specifically designed to accommodate the movement of small animals. It is a section that has been masked or cleared to ensure the safety and freedom of movement for pets within the protected space. This allows pets to navigate through the area without triggering any alarms or causing any disruptions to the security system. Therefore, the statement that a "Pet Alley" is a section of the protection pattern that allows the movement of a small animal is true.

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  • 11. 

    What is a fish tape used for?

    • Fishing

    • Used to record underwater fish noises

    • Wire retrevial

    Correct Answer
    A. Wire retrevial
    Explanation
    A fish tape is a tool used for wire retrieval. It is a long, flexible, and narrow strip of steel or fiberglass that is coiled up and can be extended to reach into tight spaces such as walls, ceilings, or conduits. The tape is inserted into the space and then used to guide and pull electrical wires or cables through the area, making it easier to install or repair electrical systems.

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  • 12. 

    Surge protectors should be  considered only after a system has been damaged once by a power surge, since it will likely happen again?

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement suggests that surge protectors should only be considered after a system has been damaged once by a power surge, implying that it is necessary to experience damage before taking preventive measures. However, this is incorrect. Surge protectors are designed to prevent damage from power surges, and it is recommended to use them as a proactive measure to protect electronic devices and systems from potential damage caused by power surges. Therefore, the correct answer is False.

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  • 13. 

    For an intruder to be sensed by a PIR, it is best if he

    • Is wearing summer clothing

    • Walks toward the detector

    • Walks away from the detector

    • Walks across the detector's pattern

    Correct Answer
    A. Walks across the detector's pattern
    Explanation
    The correct answer is "walks across the detector's pattern." PIR (Passive Infrared) sensors detect changes in infrared radiation, such as body heat, within their detection pattern. When an intruder walks across the detector's pattern, their body heat will cause a change in the infrared radiation, triggering the sensor to sense their presence. This is the most effective way for an intruder to be detected by a PIR sensor.

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  • 14. 

    The input coil of a transformer is called the

    • Primary

    • Secondary

    • Tertiary

    • Inductance

    Correct Answer
    A. Primary
    Explanation
    The input coil of a transformer is called the primary coil because it is the coil that receives the input voltage. It is connected to the power source and is responsible for transferring the electrical energy to the secondary coil. The primary coil typically has a higher number of turns than the secondary coil, which allows for voltage transformation in the transformer.

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  • 15. 

    Which of the following is an environmental sensor?

    • Pull station

    • CO detector

    • Digital communicator

    • Floor stress sensor

    Correct Answer
    A. CO detector
    Explanation
    A CO detector is an environmental sensor because it is designed to detect the presence of carbon monoxide gas in the environment. Carbon monoxide is a toxic gas that is colorless and odorless, making it difficult to detect without a specialized sensor. CO detectors are typically used in homes and buildings to provide an early warning of a potential carbon monoxide leak, allowing people to evacuate and seek help before being exposed to dangerous levels of the gas.

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  • 16. 

    Where should an alarm installer keep her licence

    • The truck glove box

    • Her briefcase

    • Safety deposit box

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    An alarm installer should keep her license on her person at all times while working. Keeping it in the truck glove box, her briefcase, or a safety deposit box would not be appropriate as it may not be easily accessible when needed for verification or inspection.

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  • 17. 

    The names of the contact on a SPDT relay are

    • Common, on, off

    • Common, coil, armature

    • Common, NC, NO

    • Fixed, NC, common

    Correct Answer
    A. Common, NC, NO
    Explanation
    The correct answer is "common, NC, NO". In a SPDT (Single Pole Double Throw) relay, there are three terminals: common (C), normally closed (NC), and normally open (NO). The common terminal is the central terminal that is connected to either the NC or NO terminal depending on the relay's state. The normally closed terminal is connected to the common terminal when the relay is not energized, and it opens when the relay is energized. On the other hand, the normally open terminal is not connected to the common terminal when the relay is not energized, and it closes when the relay is energized.

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  • 18. 

    The primary goal of a security system is

    • Make loud noise

    • Reduce the customer's property loss

    • Call the neighbors and police

    • Scare the burglar

    Correct Answer
    A. Reduce the customer's property loss
    Explanation
    The primary goal of a security system is to reduce the customer's property loss. This means that the system is designed to prevent or minimize any damage or theft that may occur on the customer's property. While making a loud noise, calling the neighbors and police, and scaring the burglar may be secondary effects of a security system, the main purpose is to protect the customer's belongings and assets.

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  • 19. 

    A RJ-45 jack can be used in place of a RJ-31

    • True

    • False

    Correct Answer
    A. False
    Explanation
    RJ-45 and RJ-31 are two different types of jacks used in telecommunications. RJ-45 jacks are commonly used for Ethernet connections, while RJ-31 jacks are used for connecting alarm systems to telephone lines. These two jacks have different pin configurations and functions, so they are not interchangeable. Therefore, a RJ-45 jack cannot be used in place of a RJ-31 jack.

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  • 20. 

    When running cable in a drop ceiling, if you wish to cross a firewall

    • You must use metallic sheathed cable

    • You must use FT-4 cable

    • You may penetrate the fire wall, as long as you seal the hole around the cable

    • You may not penetrate the firewall

    Correct Answer
    A. You may penetrate the fire wall, as long as you seal the hole around the cable
  • 21. 

    In an electric door strike, the term "fail secure" means

    • The door unlocks when power is removed

    • The door locks when power is removed

    • The unit well never fail

    • The strike may be used when part of an alarm system

    Correct Answer
    A. The door locks when power is removed
    Explanation
    In an electric door strike, the term "fail secure" means that the door locks when power is removed. This means that even in the event of a power failure or interruption, the door will remain locked and secure. This is important for security purposes, as it ensures that unauthorized individuals cannot gain access to the door when there is no power.

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  • 22. 

    Free egress from a building is required

    • Only when necessary

    • At all times

    • When required by the fire marshal

    • When the access system is disabled

    Correct Answer
    A. At all times
    Explanation
    The phrase "free egress from a building" refers to the ability to exit a building without any obstruction or hindrance. This requirement is necessary "at all times" to ensure the safety of occupants in case of emergencies such as fires or other hazards. It is crucial to have unrestricted access to exits at all times, regardless of whether it is deemed necessary by the fire marshal or if the access system is disabled.

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  • 23. 

    In DC circuits, capacitors are used mainly to

    • Isolate a transformer

    • Filter fluctuation voltage levels

    • Convert DC to AC

    • Reverse series inductance

    Correct Answer
    A. Filter fluctuation voltage levels
    Explanation
    Capacitors are commonly used in DC circuits to filter fluctuation voltage levels. This is because capacitors have the ability to store and release electrical energy quickly, which helps to smooth out any sudden changes or fluctuations in voltage. By placing a capacitor in parallel with a load, it can absorb any spikes or dips in voltage, providing a more stable and consistent power supply. This is particularly useful in sensitive electronic devices that require a steady voltage to function properly.

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  • 24. 

    The amount of electricity going past a given point in a circuit is called.

    • Voltage

    • Current

    • Resistance

    • Inductance

    Correct Answer
    A. Current
    Explanation
    The amount of electricity flowing through a given point in a circuit is referred to as current. Current is measured in amperes and represents the rate of flow of electric charge. It is a fundamental concept in electrical engineering and is essential for understanding the behavior of circuits and devices. Voltage, resistance, and inductance are related concepts but represent different aspects of electrical circuits.

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  • 25. 

    What is the rule regarding cable penetrating the vapor barrier of a wall?

    • The cable must be rated FT-1 or higher

    • The cable must be rated FT-4 or higher

    • The cable must be rated CMP

    • The hole around the cable must be sealed

    Correct Answer
    A. The hole around the cable must be sealed
    Explanation
    The rule regarding cable penetrating the vapor barrier of a wall is that the hole around the cable must be sealed. This is important to prevent the passage of moisture and air through the hole, which could lead to damage or inefficiency in the wall's insulation. Properly sealing the hole helps maintain the integrity of the vapor barrier and ensures that the wall functions as intended.

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  • 26. 

    The acknowledge tone the given by the alarm receiver to a digital dialer telling it to begin transmitting is called the

    • "greeting tone"

    • "handshake"

    • "kiss-off"

    • "ready tone"

    Correct Answer
    A. "handshake"
    Explanation
    The correct answer is "handshake". In digital communication, a handshake is the process of initiating a connection between two devices. It involves a series of signals or tones exchanged between the sender and receiver to establish a connection and ensure that both devices are ready to transmit and receive data. The handshake tone mentioned in the question refers to the acknowledgment tone given by the alarm receiver to a digital dialer, indicating that it is ready to begin transmitting data.

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  • 27. 

    Four 100 ohm resistors connected in parallel have the equivalent value of

    • 33.3 ohm

    • 250 ohm

    • 333 ohm

    • 25.0 ohm

    Correct Answer
    A. 25.0 ohm
    Explanation
    When resistors are connected in parallel, the equivalent resistance is calculated using the formula 1/Req = 1/R1 + 1/R2 + 1/R3 + 1/R4. In this case, since all four resistors have the same value of 100 ohms, the equation becomes 1/Req = 1/100 + 1/100 + 1/100 + 1/100. Simplifying this equation gives 1/Req = 4/100. Taking the reciprocal of both sides gives Req = 100/4, which simplifies to 25.0 ohm. Therefore, the equivalent value of four 100 ohm resistors connected in parallel is 25.0 ohm.

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  • 28. 

    A step down transformer

    • Acts as an electronic switch

    • Converts AC to DC

    • Provides a reduced AC voltage

    • All of the above

    Correct Answer
    A. Provides a reduced AC voltage
    Explanation
    A step down transformer is designed to lower the voltage of an alternating current (AC) power source. It has more turns on its secondary coil than on its primary coil, which results in a reduced voltage output. This allows the transformer to provide a lower AC voltage to devices or systems that require it. Therefore, the correct answer is "provides a reduced AC voltage."

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  • 29. 

    The device which operates on the principle of mutual inductance of parallel coils is

    • Choke

    • Transformer

    • Transistor

    • Biomimetic gel

    Correct Answer
    A. Transformer
    Explanation
    A transformer operates on the principle of mutual inductance of parallel coils. It consists of two or more coils wound around a common magnetic core. When an alternating current flows through the primary coil, it creates a changing magnetic field which induces a voltage in the secondary coil. This allows for the transfer of electrical energy from one circuit to another without direct electrical connection. Transformers are commonly used in power transmission and distribution systems to increase or decrease voltage levels.

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  • 30. 

    When correctly measuring a standard alarm power supply voltage your digital VOM reads +6.80 VDC. No devices are connected to the terminals. This means that

    • The power supply is working

    • The positive lead of the meter is connected incorrectly

    • The voltage is to low for the system devices to function correctly

    • The wire gauge is too small

    Correct Answer
    A. The voltage is to low for the system devices to function correctly
    Explanation
    When the digital VOM reads a voltage of +6.80 VDC, it indicates that the voltage is too low for the system devices to function correctly. This means that the power supply is not providing enough voltage for the devices to operate properly.

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  • 31. 

    A non-metallic material that allows the flow of electrons is a

    • Semi-conductor

    • Conductor

    • Insulator

    • Resistor

    Correct Answer
    A. Semi-conductor
    Explanation
    A semi-conductor is a non-metallic material that allows the flow of electrons. Unlike conductors, which have high conductivity, and insulators, which have low conductivity, semi-conductors have moderate conductivity. This means that they can conduct electricity under certain conditions, such as when exposed to heat or light. Semi-conductors are widely used in electronic devices, such as transistors and diodes, due to their ability to control the flow of electrons and their versatility in conducting or blocking electrical current.

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  • 32. 

    If an intruder has the same temperture as the surrounding air, will a PIR motion detector detect his motion?

    • Yes because temperature is not the only consideration

    • Depends if the intruder moves quickly or slowly

    • No, because the PIR cannot differentiate uniform temperatures

    • Yes, because the transducer will sense the noise of the intruder

    Correct Answer
    A. Yes because temperature is not the only consideration
    Explanation
    The correct answer is yes because temperature is not the only consideration. PIR motion detectors work by detecting changes in infrared radiation, which is emitted by all objects with a temperature above absolute zero. While temperature is a factor, the detector also considers the movement and changes in the infrared radiation pattern. Therefore, even if the intruder has the same temperature as the surrounding air, the motion detector can still detect their motion based on the changes in the infrared radiation pattern caused by their movement.

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  • 33. 

    Which of the following groups of ambient conditions are those to be cautious of when installing PIR motion detectors?

    • Loose-fitting doors, moving water in pipes, high-pitched noises

    • Fluorescent lighting, high humidity or a plasma television

    • Objects with rapidly changing temperatures, ie fax machines, heater

    • Carpeted areas, sound-absorbing wall covering

    Correct Answer
    A. Objects with rapidly changing temperatures, ie fax machines, heater
    Explanation
    PIR motion detectors are sensitive to changes in temperature, and objects with rapidly changing temperatures such as fax machines and heaters can cause false alarms. These objects emit heat, which can trigger the motion detector and result in unnecessary alerts. Therefore, it is important to be cautious of these ambient conditions when installing PIR motion detectors to ensure accurate and reliable detection.

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  • 34. 

    The frequency of ultrasonic waves goes unchanged when reflecting off

    • Any moving object

    • Any soft object

    • Any stationary object

    • Any high-temperature object

    Correct Answer
    A. Any stationary object
    Explanation
    Ultrasonic waves are high-frequency sound waves that are above the range of human hearing. When these waves reflect off a stationary object, the frequency of the waves remains unchanged. This is because the frequency of a wave is determined by the source and does not change when it reflects off an object. Therefore, the correct answer is any stationary object.

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  • 35. 

    Electrical current is measured using

    • An ohmmeter

    • An ammeter

    • A voltmeter

    • An oscilloscope

    Correct Answer
    A. An ammeter
    Explanation
    An ammeter is used to measure electrical current. It is specifically designed to measure the flow of electric current in a circuit. Unlike an ohmmeter, which measures resistance, a voltmeter, which measures voltage, or an oscilloscope, which measures the waveform of an electrical signal, an ammeter is the appropriate tool for directly measuring the amount of current flowing through a circuit.

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  • 36. 

    Infrared radiation is a form of

    • Sound energy

    • Heat energy

    • Microwave energy

    • Invisible energy

    Correct Answer
    A. Heat energy
    Explanation
    Infrared radiation is a form of heat energy. It is a type of electromagnetic radiation that is not visible to the human eye but can be felt as heat. It is commonly emitted by objects with a temperature higher than absolute zero. Infrared radiation is used in various applications such as heating, cooking, and thermal imaging.

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  • 37. 

    A correctly installed ADSL service cannot affect the function of a digital dialer

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A correctly installed ADSL service operates on a different frequency range than a digital dialer, allowing them to function independently without interfering with each other. This means that the ADSL service does not impact the function of the digital dialer, making the statement true.

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  • 38. 

    According to the CEC, "concealed" cables are accessible for service

    • True

    • False

    Correct Answer
    A. False
    Explanation
    According to the CEC, "concealed" cables are not accessible for service. This means that these cables are hidden or covered and cannot be easily reached or serviced. Therefore, the correct answer is False, indicating that concealed cables are not accessible for service.

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  • 39. 

    The amount of voltage drop across a short circuit:

    • Is easily determined using ohm's law

    • Depends on the current flow

    • Depends on the voltage source

    • Is always 0V

    Correct Answer
    A. Is always 0V
    Explanation
    The correct answer is "is always 0V". In a short circuit, the resistance is extremely low or zero, causing a large current to flow. According to Ohm's Law (V = IR), if the resistance is zero, the voltage drop across it will also be zero. Therefore, in a short circuit, the voltage drop is always 0V.

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  • 40. 

    When measuring the continuity of an alarm circuit, the circuit should be

    • Connected to the alarm panel with power on

    • Connected to the alarm panel with power off

    • Disconnected from the alarm panel

    • In alarm

    Correct Answer
    A. Disconnected from the alarm panel
    Explanation
    When measuring the continuity of an alarm circuit, it is important to disconnect it from the alarm panel. This is because measuring continuity requires breaking the circuit to check if there is a continuous path for the current to flow. If the circuit is still connected to the alarm panel, it may interfere with the measurement and give inaccurate results. Therefore, disconnecting the circuit from the alarm panel ensures that the measurement is accurate and reliable.

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  • 41. 

    A motion detector in an alarm system detects motion

    • At all times

    • Only when the panel is armed

    • When a change in the room ambient energy occurs

    • Only if an entry circuit is broken first

    Correct Answer
    A. At all times
    Explanation
    The correct answer is "at all times" because a motion detector in an alarm system is designed to constantly monitor and detect any movement within its range, regardless of whether the alarm panel is armed or not. It is a crucial component of the system that is always active to ensure the security of the premises.

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  • 42. 

    Dual-technology detectors have the advantage of

    • Being able to respond more quickly in all conditions

    • Better stability in areas of ambient disturbances

    • Providing better "cross-walk" sensitivity

    • Being lower in price than other detectors

    Correct Answer
    A. Better stability in areas of ambient disturbances
    Explanation
    Dual-technology detectors have the advantage of better stability in areas of ambient disturbances. This means that they are less likely to be affected by external factors such as changes in temperature, humidity, or electromagnetic interference. This stability allows the detectors to provide more accurate and reliable detection, ensuring that they are not triggered falsely by environmental conditions. As a result, dual-technology detectors are a preferred choice in areas where there may be a higher likelihood of ambient disturbances, such as busy commercial spaces or areas with high foot traffic.

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  • 43. 

    Which dialer format will transmit information the most quickly?

    • DTMF

    • JSKY

    • FSK

    Correct Answer
    A. DTMF
    Explanation
    DTMF (Dual-Tone Multi-Frequency) is a dialer format that transmits information quickly. It uses a combination of two frequencies to represent each digit or symbol, allowing for efficient transmission of data. JSKY and FSK are not commonly used dialer formats and may not have the same level of speed and efficiency as DTMF. Therefore, DTMF is the correct answer for the format that transmits information the most quickly.

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  • 44. 

    A ULC fire alarm certificate may issued by

    • The authority having jurisdiction

    • Only a ULC listed company

    • All companies following ULC installation standards

    • An insurance company

    Correct Answer
    A. Only a ULC listed company
    Explanation
    A ULC fire alarm certificate can only be issued by a ULC listed company. This means that the company has been certified by the Underwriters Laboratories of Canada (ULC) to meet the required standards for fire alarm installation. The authority having jurisdiction may require that the certificate is issued by a ULC listed company to ensure that the fire alarm system meets the necessary safety standards. An insurance company may not have the expertise or authority to issue such a certificate. Companies following ULC installation standards may be considered, but the requirement is specifically for a ULC listed company.

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  • 45. 

    A 4.5 amp-hour battery will provide 300 mA of current for

    • Depends on the load

    • 1.35 hours

    • 1.5 hours

    • 15 hours

    Correct Answer
    A. 15 hours
    Explanation
    A 4.5 amp-hour battery can provide 300 mA of current for 15 hours. This is because the capacity of the battery is given in amp-hours, which means it can deliver a certain amount of current (in this case, 4.5 amps) for a specific duration (15 hours). Since the load is not specified in the question, we can assume that the battery will provide 300 mA of current for the full 15 hours.

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  • 46. 

    A 100 Watt 120 Volt CCTV power supply consumes how many amps?

    • 120 amps

    • 1200 milliwatts

    • 0.83 amps

    • 1.2 amps

    Correct Answer
    A. 0.83 amps
    Explanation
    The correct answer is 0.83 amps. To calculate the amperage, we can use the formula P (power in watts) = V (voltage in volts) x I (current in amps). Rearranging the formula, we can find that I = P / V. Plugging in the values, we get I = 100W / 120V = 0.83 amps. Therefore, a 100 Watt 120 Volt CCTV power supply consumes 0.83 amps.

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  • 47. 

    Which of the following is true?

    • Only non-magnetic materials will shield magnetism

    • A magnetic field exists around any current-carrying conductor

    • A magnetic field can only be established when a coil is used

    • Electromagnetism occurs using only DC and not AC

    Correct Answer
    A. A magnetic field exists around any current-carrying conductor
    Explanation
    A magnetic field exists around any current-carrying conductor. When an electric current flows through a conductor, it creates a magnetic field around it. This is a fundamental principle of electromagnetism known as Ampere's law. The strength and direction of the magnetic field depend on the magnitude and direction of the current. This principle is widely used in various applications, such as electric motors, transformers, and magnetic resonance imaging (MRI) machines.

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  • 48. 

    A PIR motion sensor creates zones of detection to cover a large area through the use of

    • Dual-element sensors

    • Walk-test LED's

    • Mirrors or lenses

    • Pulse-count circuity

    Correct Answer
    A. Mirrors or lenses
    Explanation
    Mirrors or lenses are used in a PIR motion sensor to create zones of detection and cover a large area. These components help to focus and direct the infrared radiation emitted by a moving object towards the dual-element sensors of the sensor. By using mirrors or lenses, the sensor can effectively detect motion within its range and trigger the appropriate response. Walk-test LED's and pulse-count circuitry are not directly related to the creation of detection zones, while dual-element sensors are mentioned as the components that work in conjunction with mirrors or lenses.

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  • 49. 

    Photo-electric beams transmit

    • Harmonics above the range of human hearing

    • Pulsed infrared energy

    • Electro waves

    • Air turbulence

    Correct Answer
    A. Pulsed infrared energy
    Explanation
    Pulsed infrared energy is the correct answer because photo-electric beams use infrared light to detect the interruption of the beam. These beams work by emitting short bursts of infrared energy and then measuring the amount of energy that is reflected back. When an object interrupts the beam, the amount of reflected energy changes, indicating the presence of an object. Therefore, the photo-electric beams transmit pulsed infrared energy to detect objects.

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  • Jun 03, 2024
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  • Oct 23, 2010
    Quiz Created by
    Sukh

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