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3.18

3.18
13問 • 1年前
  • Guevara Official
    • 通報

    問題一覧

  • 1

    An AC motor rotates at the same speed as the supply frequency:

    Synchronous motor

  • 2

    In a 2 phase motor the phases are electrically at

    90 degrees from each other

  • 3

    The poor starting torque of a three induction motor can be improved :

    increasing the rotor resistance to increase the power factor toward unity

  • 4

    The synchronous speed a 8-pole motor, built to operate on 400 hertz.115 VAC=

    6000RPM

  • 5

    What NP stands for in the following formula RPM = 120*frequency/NP:

    number of poles

  • 6

    An AC motor to find out the polarity of coil we use :

    left hand rule

  • 7

    The advantage in the used of AC motor besides the wide availability of AC power is :

    less cost

  • 8

    To change the direction of the three phase induction motor:

    swap two of the stator connections

  • 9

    The phases in supply 2 phases motor are electrically:

    90 degrees apart from each other

  • 10

    Majority of the motors used throughout the aircraft are design to operate on:

    AC

  • 11

    The induction motor is :

    the most commonly used type of AC motor

  • 12

    If a three phase synchronous AC motor is working with a constant load, if one of these phases is disabled then the motor speed will:

    decrease by a third

  • 13

    A three phase actuator is often controlled by changeover contactor:

    reversing two of the three-phases allowing it to operate in both direction

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    15問 • 1年前
    Guevara Official

    問題一覧

  • 1

    An AC motor rotates at the same speed as the supply frequency:

    Synchronous motor

  • 2

    In a 2 phase motor the phases are electrically at

    90 degrees from each other

  • 3

    The poor starting torque of a three induction motor can be improved :

    increasing the rotor resistance to increase the power factor toward unity

  • 4

    The synchronous speed a 8-pole motor, built to operate on 400 hertz.115 VAC=

    6000RPM

  • 5

    What NP stands for in the following formula RPM = 120*frequency/NP:

    number of poles

  • 6

    An AC motor to find out the polarity of coil we use :

    left hand rule

  • 7

    The advantage in the used of AC motor besides the wide availability of AC power is :

    less cost

  • 8

    To change the direction of the three phase induction motor:

    swap two of the stator connections

  • 9

    The phases in supply 2 phases motor are electrically:

    90 degrees apart from each other

  • 10

    Majority of the motors used throughout the aircraft are design to operate on:

    AC

  • 11

    The induction motor is :

    the most commonly used type of AC motor

  • 12

    If a three phase synchronous AC motor is working with a constant load, if one of these phases is disabled then the motor speed will:

    decrease by a third

  • 13

    A three phase actuator is often controlled by changeover contactor:

    reversing two of the three-phases allowing it to operate in both direction