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Quizzes Created: 18 | Total Attempts: 58,937
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Electrical Quizzes & Trivia

Electrical


Questions and Answers
  • 1. 

    Any channel designed to enclose and loosely hold electric conductors; may be of metal or of an insulating material; various types include rigid conduit, flexible metallic conduit, nonmetallic conduit, metallic tubing, under-floor raceways, cellular floor raceways, surface metal raceways, structural raceways, wireways and busways, and auxiliary gutters or moldings. 

    • A.

      Race way

    • B.

      Wire track

    • C.

      Wire tubing

    • D.

      Race track

    Correct Answer
    A. Race way
    Explanation
    A raceway is a channel that is used to enclose and hold electric conductors. It can be made of metal or insulating material. There are various types of raceways including rigid conduit, flexible metallic conduit, nonmetallic conduit, metallic tubing, under-floor raceways, cellular floor raceways, surface metal raceways, structural raceways, wireways and busways, and auxiliary gutters or moldings. Therefore, the correct answer is "race way".

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  • 2. 

    1.  Electrical term “raceway” applied to:

    • A.

      A. a channel system in carrying

    • B.

      B. where electric cars pass

    • C.

      C. conductor of heavy load energy

    • D.

      D. a grouping of transformer

    Correct Answer
    A. A. a channel system in carrying
    Explanation
    The term "raceway" in the electrical context refers to a channel system used for carrying electrical conductors. It is a conduit or duct that provides a protected pathway for wires or cables to be installed and routed. This helps to organize and protect the electrical wiring, preventing damage and ensuring safety.

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  • 3. 

    1.  To bring up voltage, we use:

    • A.

      A. step-down transformer

    • B.

      B. voltage booster

    • C.

      C. step-two transformer

    • D.

      D. step-up transformer

    Correct Answer
    D. D. step-up transformer
    Explanation
    A step-up transformer is used to increase voltage. It has more turns in the secondary coil than in the primary coil, which allows it to step up the voltage. This is useful in various applications such as power transmission over long distances, where high voltage is required to minimize power loss. Additionally, step-up transformers are used in electronic devices to increase voltage for certain components or circuits that require higher voltage levels.

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  • 4. 

    1.  To bring down voltage, we use:

    • A.

      A. step-down transformer

    • B.

      B. voltage booster

    • C.

      C. step-two transformer

    • D.

      D. step-up transformer

    Correct Answer
    A. A. step-down transformer
    Explanation
    A step-down transformer is used to bring down voltage. This is because a step-down transformer has more turns in the primary coil than in the secondary coil. When an alternating current is passed through the primary coil, it induces a lower voltage in the secondary coil due to the difference in the number of turns. This allows for the voltage to be reduced before it is transmitted or used in electrical devices.

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  • 5. 

    1.  The electric power unit expressed in thousand unit is called

    • A.

      A. kips

    • B.

      B. megawatt

    • C.

      C. kilowatt

    • D.

      D. kilohertz

    Correct Answer
    C. C. kilowatt
    Explanation
    The correct answer is C. kilowatt. The electric power unit expressed in thousand units is called a kilowatt. The prefix "kilo" represents a factor of 1000, so a kilowatt is equal to 1000 watts. It is commonly used to measure the power output of electrical devices and systems.

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  • 6. 

    It is a switch in which a lever or knob, moving through a small arc, causes the contacts to  open or close an electric circuit

    • A.

      Float switch

    • B.

      Knife switch

    • C.

      Toggle switch

    • D.

      Mercury switch

    Correct Answer
    C. Toggle switch
    Explanation
    A toggle switch is a type of switch that can be moved through a small arc, either up or down, to open or close an electric circuit. Unlike a float switch, which is typically used to detect liquid levels, or a knife switch, which has a lever that moves in a straight line, a toggle switch has a lever or knob that can be toggled back and forth to control the circuit. The term "toggle" refers to the action of switching between two states, on and off, by moving the lever or knob. A mercury switch, on the other hand, uses the movement of mercury to open or close the circuit.

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  • 7. 

    A rubber or plastic washer inserted in a hole in a metal part to prevent grounding of a wire passing through the hole

    • A.

      Insulator

    • B.

      Bushing

    • C.

      Shield

    • D.

      Grommet

    Correct Answer
    D. Grommet
    Explanation
    A grommet is a rubber or plastic washer that is inserted in a hole in a metal part to prevent grounding of a wire passing through the hole. It acts as an insulator, preventing the wire from coming into contact with the metal and causing a short circuit. Therefore, the correct answer is grommet.

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  • 8. 

    It is a switch in which a hinge copper blade is placed between 2 contact plates

    • A.

      Float switch

    • B.

      Knife switch

    • C.

      Toggle switch

    • D.

      Mercury switch

    Correct Answer
    B. Knife switch
    Explanation
    A knife switch is a type of switch that consists of a hinged copper blade placed between two contact plates. When the blade is in the closed position, it makes contact with the plates and allows the flow of electricity. When the blade is flipped to the open position, it breaks the circuit and stops the flow of electricity. The design of the knife switch resembles a knife, hence the name. This type of switch is commonly used in electrical circuits for manual control and is known for its simplicity and reliability.

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  • 9. 

    What type of building wire has a trade name of Moisture and Heat Resistant Thermoplastic used for dry and wet locations

    • A.

      TW

    • B.

      MTW

    • C.

      THHN

    • D.

      THW

    Correct Answer
    D. THW
    Explanation
    THW is the correct answer because it refers to a type of building wire that has a trade name of Moisture and Heat Resistant Thermoplastic. It is specifically designed for use in both dry and wet locations, making it suitable for a variety of applications.

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