Motors Book - Chapter 4

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Motors Book Quizzes & Trivia

Questions and Answers
  • 1. 

    A ___ motor transfer energy from electric power to the load through the use of a rotating magnetic field.

    • A.

      Design

    • B.

      Single-phase

    • C.

      3-phase

    • D.

      DC

    Correct Answer
    C. 3-phase
    Explanation
    A 3-phase motor transfers energy from electric power to the load through the use of a rotating magnetic field. This type of motor is commonly used in industrial applications due to its efficiency and ability to provide high torque. The rotating magnetic field is created by the interaction of three separate phases of AC power, which allows for smooth and continuous operation of the motor.

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  • 2. 

    A ___ is the fixed, unmoving part of motor, consisting of a core and windings, that converts electrical energy to the energy of a magnetic field.

    • A.

      Motor shaft

    • B.

      Drum switch

    • C.

      Cartridge fuse

    • D.

      Stator

    Correct Answer
    D. Stator
    Explanation
    The stator is the fixed, unmoving part of a motor that consists of a core and windings. It is responsible for converting electrical energy into the energy of a magnetic field. The stator plays a crucial role in the operation of the motor by generating a magnetic field that interacts with the rotor to produce rotational motion.

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  • 3. 

    The most common types of rotors are used in squirrel-cage induction motors, ___ motors, and synchronous motors.

    • A.

      Wound-rotor

    • B.

      Open

    • C.

      Salient

    • D.

      Flux

    Correct Answer
    A. Wound-rotor
    Explanation
    The correct answer is "wound-rotor". The question asks for the most common types of rotors used in squirrel-cage induction motors, ___ motors, and synchronous motors. Among the options provided, "wound-rotor" is the only type of rotor commonly used in these types of motors. Squirrel-cage induction motors, wound-rotor motors, and synchronous motors all typically use wound-rotor type rotors.

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  • 4. 

    As the rotor begins to move, the frequency of the induced current in the rotor decreases, until the rotor approaches synchronous speed, where the rotor frequency approaches ___ Hz.

    • A.

      0

    • B.

      50

    • C.

      60

    • D.

      120

    Correct Answer
    A. 0
    Explanation
    As the rotor begins to move, the frequency of the induced current in the rotor decreases because it is influenced by the relative speed between the rotating magnetic field of the stator and the rotor. As the rotor approaches synchronous speed, the relative speed decreases and the frequency of the induced current in the rotor approaches 0 Hz. This is because at synchronous speed, the rotor frequency matches the frequency of the rotating magnetic field, resulting in no relative motion and therefore no induced current.

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  • 5. 

    A single-___ motor is a motor that operates at only one voltage level.

    • A.

      Design

    • B.

      Voltage

    • C.

      Stator

    • D.

      Torque

    Correct Answer
    B. Voltage
    Explanation
    A single-voltage motor is a motor that is designed to operate at only one specific voltage level. This means that it cannot be used with different voltage levels and is limited to operating at a fixed voltage.

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  • 6. 

    In a ___ motor, one end of each of the three phase windings is internally connected to the other phase windings.

    • A.

      Single-voltage, delta connected

    • B.

      Dual-voltage, wye connected, three-phase

    • C.

      Wye connected, single-phase

    • D.

      Wye connected, 3-phase

    Correct Answer
    D. Wye connected, 3-phase
    Explanation
    In a wye connected, 3-phase motor, one end of each of the three phase windings is internally connected to the other phase windings. This means that the three windings are connected in a star or wye configuration, with one end of each winding connected together. This type of connection allows for a balanced distribution of voltage and current across the three phases, making it suitable for three-phase power systems.

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  • 7. 

    In a ___ motor, each phase is wired end-to-end to form a completely closed circuit.

    • A.

      Single-voltage, wye connected, three-phase

    • B.

      Dual-voltage, wye connected, three-phase

    • C.

      Delta-connected, 3-phase

    • D.

      Delta-connected, single-phase

    Correct Answer
    C. Delta-connected, 3-phase
    Explanation
    In a delta-connected, 3-phase motor, each phase is wired end-to-end to form a completely closed circuit. This means that the starting point of one phase is connected to the finishing point of the previous phase, creating a continuous loop. This configuration allows for a balanced distribution of electrical current and provides higher efficiency and power output compared to other motor configurations.

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  • 8. 

    A typical dual-voltage, 3-phase motor rating is ___V.

    • A.

      230/460

    • B.

      240/480

    • C.

      208-230/460

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The correct answer is "all of the above" because a typical dual-voltage, 3-phase motor rating can be either 230V or 460V, 240V or 480V, or 208-230V or 460V. These different voltage options allow the motor to be compatible with various power supply systems, providing flexibility in different locations or applications.

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  • 9. 

    The common types of torque related to motors are locked-rotor torque and ___ torque.

    • A.

      Full-load

    • B.

      Pull-up

    • C.

      Breakdown

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The correct answer is "all of the above" because the question states that the common types of torque related to motors are locked-rotor torque and "___" torque. Since the options provided include full-load, pull-up, and breakdown, and the question does not specify any other types of torque, it can be inferred that all of these options are correct and related to motor torque.

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  • 10. 

    ___ power is the product of the total current and voltage in a circuit.

    • A.

      Reactive

    • B.

      Apparent

    • C.

      True

    • D.

      Motor

    Correct Answer
    B. Apparent
    Explanation
    Apparent power is the product of the total current and voltage in a circuit. It represents the total power that is being supplied to a circuit, including both the real power (which is the actual power consumed by the circuit) and the reactive power (which is the power required to maintain the magnetic or electric fields in the circuit). Apparent power is measured in volt-amperes (VA) and is important in determining the sizing and capacity of electrical equipment.

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  • 11. 

    ___ loss is the total energy loss in the stator and rotor cores due to circulating currents and to the magnetic field escaping from the core.

    • A.

      Resistance

    • B.

      Core

    • C.

      Bearing

    • D.

      Hysteresis

    Correct Answer
    B. Core
    Explanation
    The correct answer is "Core" because the statement mentions that the energy loss is specifically in the stator and rotor cores. This implies that the core itself is responsible for the loss due to circulating currents and the magnetic field escaping from it.

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  • 12. 

    A ___ is a motor component used to reduce friction and maintain clearance between the stationary parts and the moving shaft.

    • A.

      Bearing

    • B.

      Motor shaft

    • C.

      Fuse

    • D.

      Eutectic alloy

    Correct Answer
    A. Bearing
    Explanation
    A bearing is a motor component that is specifically designed to reduce friction and maintain clearance between the stationary parts and the moving shaft. It is an essential part of any motor system as it helps to support and guide the rotating shaft, allowing it to move smoothly and efficiently. Without a bearing, the friction between the stationary parts and the shaft would be significantly higher, leading to increased wear and tear and decreased overall performance of the motor.

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  • 13. 

    The motor ___ indicates whether a motor is rated to operate at 50 Hz, 60 Hz, or both.

    • A.

      Label

    • B.

      Identification tag

    • C.

      Nameplate

    • D.

      Load

    Correct Answer
    C. Nameplate
    Explanation
    The nameplate of a motor typically contains important information about its specifications, including the frequency at which it is rated to operate. This information is crucial for determining whether the motor is suitable for use with a 50 Hz power supply, a 60 Hz power supply, or both. Therefore, the nameplate is the correct answer in this case.

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  • 14. 

    Motors for ___ loads are designed to give the same maximum torque at all speeds.

    • A.

      Variable-horsepower

    • B.

      Variable-torque

    • C.

      Constant-horsepower

    • D.

      Constant-torque

    Correct Answer
    D. Constant-torque
    Explanation
    Motors for constant-torque loads are designed to provide the same maximum torque at all speeds. This means that regardless of the speed at which the motor is operating, it will be able to deliver the same level of torque. This is important for applications where a consistent level of torque is required, such as in conveyor systems or lifting equipment. Constant-torque motors are designed to maintain a steady level of torque output, ensuring reliable and consistent performance.

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  • 15. 

    ___ loss is the loss of flux in the air gap because the air gap has increased reluctance compared to the cores.

    • A.

      Bearing

    • B.

      Flux-linkage

    • C.

      Windage

    • D.

      Sound

    Correct Answer
    B. Flux-linkage
    Explanation
    Flux-linkage loss refers to the loss of magnetic flux in the air gap of a magnetic circuit. This occurs because the air gap has a higher reluctance (opposition to the flow of magnetic flux) compared to the cores. As a result, the magnetic flux is reduced or lost in the air gap, leading to energy losses. This phenomenon is commonly observed in transformers, motors, and other electromagnetic devices where the magnetic circuit includes an air gap.

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