PEC - Chapter4 (Sheet3-Part1)

Card Set Information

Author:
Camskie
ID:
306458
Filename:
PEC - Chapter4 (Sheet3-Part1)
Updated:
2015-08-17 07:15:47
Tags:
camille chapterfour
Folders:

Description:
Chapter4
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user Camskie on FreezingBlue Flashcards. What would you like to do?


  1. ____ is a combination of the power converter, motor, and motor mounted auxiliary devices such as encoders, tachometers, thermal switches and detectors, air blowers, heaters, and vibration sensors
    Adjustable Speed Drive
  2. ____ is an interconnected combination of equipment that provides a means of adjusting the speed of a mechanical load coupled to a motor. A drive system typically consists of an adjustable speed drive and auxiliary electrical apparatus.
    Adjustable-Speed Drive System
  3. ____is any switch or device that is normally used to start and stop a motor by making and breaking the motor circuit current.
    Controller
  4. ____ is the circuit of a control apparatus or system that carries the electric signals directing the performance of the controller but does not carry the main power current.
    Motor Control Circuit
  5. ____ is a redundantly monitored, remotely operated contactor-isolating system, packaged to provide the disconnection/isolation function, capable of verifiable operation from multiple remote locations by means of lockout switches, each having the capability of being padlocked in the “off” (open) position.
    System Isolation Equipment
  6. ____ or ___ is one that is arranged for starting by first energizing part of its primary (armature) winding and, subsequently, energizing the remainder of this winding in one or more steps.
    Part-winding Start Induction or Synchronous Motor
  7. Exception: A short-circuit and ground-fault protective device shall be permitted for both windings if the device will allow the motor to start. Where time-delay (dual-element) fuses are used, they shall be permitted to have a rating not exceeding __ percent of the motor full load current
    150
  8. Motors built for low speeds (less than __ RPM) or high torques may have higher full-load currents, and multispeed motors will have full-load current varying with speed, the nameplate current ratings shall be used to determine the ampacity of conductors or ampere ratings of switches, branch-circuit short-circuit and ground fault protection, instead of the actual current rating marked on the motor nameplate
    1 200
  9. For torque motors, the rated current shall be __ current
    locked-rotor
  10. If the maximum operating current does not appear on the nameplate, the ampacity determination shall be based on __ percent of the values given in Table 4.30.14.3 and Table 4.30.14.4
    150
  11. Code letter or locked-rotor amperes if an alternating-current motor rated __ hp or more. On polyphase wound-rotor motors, the code letter shall be omitted
    ½
  12. Fractional horsepower dc motors __ mm or less in diameter shall not be required to be marked. (Winding)
    180
  13. Exception No. 4: Short-circuit ratings are not required for controllers rated less than __ hp at __ V or less and listed exclusively for general-purpose branch circuits
    • 2
    • 300
  14. Control circuit devices with screw-type pressure terminals used with __ mm2 (__ mm dia.) or smaller copper conductors shall be torqued to a minimum of __ Nm unless identified for a different torque value
    • 2.0 mm2 (1.6 mm dia.)
    • 0.8 Nm
  15. Exception: Ventilation shall not be required for __ types of motors
    submersible
  16. Conductors that supply a single motor used in acontinuous duty application shall have an ampacity of not less than __ percent of the motor’s full-load current rating as determined by 4.30.1.6(a)(1)
    125
  17. Exception: For dc motors operating from a rectified single-phase power supply, the conductors between the field wiring terminals of the rectifier and the motor shall have an ampacity of not less than the following percent of the motor full-load current rating:

    (a) Where a rectifier bridge of the single-phase half-wave type is used, __ percent.

    (b) Where a rectifier bridge of the single-phase full-wave type is used, __ percent
    • 190
    • 150
  18. For a wye-start, delta-run connected motor, the selection of branch-circuit conductors on the line side of the controller shall be based on the motor full-load current. The selection of conductors between the controller and the motor shall be based on __ percent of the motor full-load current
    58
  19. For a part-winding connected motor, the selection of branch-circuit conductors on the line side of the controller shall be based on the motor full-load current. The selection of conductors between the controller and the motor shall be based on __ percent of the motor full-load current
    50
  20. A 15-Minute Rated Motor operates at intermittent duty has nameplate current rating of 20A, what must be the ampacity of conductors serving the motor?
    20A x 85% = 17A
  21. The conductors between a stationary motor rated 1 hp or less and the separate terminal enclosure permitted in 4.30.13.5(b) shall be permitted to be smaller than __ mm2 (__ mm dia.) but not smaller than ___mm2, provided they have an ampacity as specified in 4.30.2.2(a)
    • 2.0 mm2 (1.6 mm dia.)
    • 0.75 mm2
  22. For continuous duty, the conductors connecting the secondary of a wound-rotor ac motor to its controller shall have an ampacity not less than __ percent of the full-load secondary current of the motor
    125

What would you like to do?

Home > Flashcards > Print Preview