PEC - Random Questions 3

Card Set Information

Author:
Camskie
ID:
305039
Filename:
PEC - Random Questions 3
Updated:
2015-08-03 08:54:11
Tags:
camille
Folders:

Description:
PEC Random Questions 3
Show Answers:

Home > Flashcards > Print Preview

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


  1. Where
    a flexible cord is used to supply a room air conditioner,  the length of such cord shall not exceed
    ________mm for a nominal 120 volt
    rating
    3000 mm
  2. Where
    a flexible cord is used to supply a room air conditioner,  the length of such cord shall not exceed
    ________mm for a nominal 208- or 240
    volt rating.
    1800 mm
  3. An
    overcurrent protective device of adequate short circuit rating that will open simultaneously  all ungrounded conductors shall be applied in the grounding
    autotransformer branch circuit and shall be rated or set at a current
    not exceeding ________ percent of the
    autotransformer continuous per phase current rating
    125percent
  4. An
    overcurrent protective device of adequate short circuit rating that will open
    simultaneously  all ungrounded conductors
    shall be applied in the grounding autotransformer branch circuit and shall be
    rated or set at a current not exceeding ________ percent of the continuous current rating of any series
    connected devices in the autotransformerneutral connection
    42  percent
  5. A
    ________ system that will cause the opening of the main switch or common
    trip overcurrent device for the 3-phase,
    4wire system shall be provided to guard against single phasing or internal
    faults
    Fault-Sensing system
  6. If
    the current-interrupting device is separate from the motor compressor and its
    control circuit is operated by a protective device integral with the
    motor-compressor, it shall be ________ so that the opening of the control
    circuit will result in interruption of current to the motor-compressor
    ARRANGED
  7. Motor-compressor’s
    attachment plug and receptacle rating shall not exceed ________ amperes   at 125
    volts
    20  Amperes
  8. Motor-compressor’s
    attachment plug and receptacle rating shall not exceed ________ amperes   at 250
    volts
    15   Amperes
  9. An
    attachment plug and receptacle shall be permitted to serve as the ________ for
    a single phase room air conditioner rated 250 volts or less if the manual
    controls on the room air conditioner are readily accessible and  located within ________ mm of the floor
    • Disconnecting means   
    • 1800  mm
  10. Branch
    circuit conductors supplying a single motor-compressor shall have an
    ampacity not less than ________ percent of either the motor-compressor
    rated-load current or branch-circuit selection current, whichever is greater
    125  percent
  11. A motor-compressor controller
    shall have both a ________ full-load
    current rating and a ________ current
    rating not less than the nameplate rated-load current or branch-circuit
    selection current, whichever is greater and locked-rotor current, respectively of the compressor
    • Continuous Duty 
    • and a locked-rotor current
  12. A
    controller, serving more than one
    motor-compressor or motor-compressor
    and other loads , shall have a ________ full-load current rating and a locked-rotor current rating  not less than the ________
    • Continuous Duty 
    • Combined Load
  13. Conductors supplying one or more motor-compressorwith or without an additional loads shall have
    an ampacity not less than the sum
    of the rated load or ________
    ratings whichever is larger of all the motors plus the ________ currents of the other motors plus ________ percent of the highest motor or
    motor-compressor rating in the group
    • branch-circuit selection current
    • plus full-load currents
    • plus 25 percent
  14. The
    ampacity of the conductors supplying multi
    motor and combination load
    equipment shall not be less than the minimum circuit ampacity ________
    on the equipment
    Marked
  15. For small
    motor-compressor not having the locked-rotor current marked on the  nameplate or for small motor not
    covered by tables 4.30.14.1,  
    4.30.14.2,   4.30.14.3,   4.30.14.4,  
    the locked-rotor current shall be assumed ________ times the rated-load current.
    6 times
  16. An air
    conditioning or refrigerating system shall be considered to be
    a  ________ under the provisions of
    section 4.30.7.7
    Single Machine
  17. ________  is the value in amperes to be used instead
    of the rated load current in determining the ratings of the motor branchcircuit conductors, disconnecting mans,  controllers,
    and branch circuit short-circuit  and ground
    fault protective devicewherever the running overload protective device
    permits a sustained currents greater than the specified percentage of the rated
    load current
    Branch-circuit Selection current
  18. The
    value of branch-circuit selection current 
    willalways be ________ or
    ________ than the marked rated-load
    current
    EQUAL TO   or   GREATER THAN
  19. The value of
    branch-circuit selection current  willalways beEqual to  or  Greater than the marked ________ current
    Rated-load current
  20. A
    combination consisting of a compressor
    and motor, both of which are enclosed
    in the same housing, with no external shaft or shaft seals,
    the motor operating on the refrigerant
    Hermetic Refrigerant motor-compressor
  21. Hermetic
    Refrigerant motor-compressor is a combination consisting of a compressor and motor, both of which are enclosed in the same housing, with no
    external shaft or shaft seals, the motor operating on the________
    Refrigerant
  22. The
    Rated-Load current for a Hermetic
    Refrigerant motor-compressor is the current resulting when the motor-compressor
    is operated at the rated ________ ; rated ________; and rated ________ of the
    equipment it serves
    • Rated load  
    • Rated voltage
    • Rated Frequency
  23. The
    frames of portable motors that operates at over 150 volts to ground shall be ________ or ________
    GUARDED   or    GROUNDED
  24. Instruments
    transformer secondaries and exposed non-current carrying metals
    or other conductive parts or cases ofinstruments transformers, meters,
    instruments, and relays shall be 
    ________
    GROUNDED
  25. Controllers
    enclosures shall be grounded regardless of  
    ________
    regardless of VOLTAGE
  26. Where
    no rated-load current is shown on the equipment nameplate, the ________ current
    shown on the compressor nameplate shall be used
    Rated-Load current
  27. EXCEPTION:     where so marked, the Branch-circuit Selection current shall be used instead
    of  ________ current   in determining the highest rated  ( Largest ) motor- compressor
    Rated-Load current
  28. Dry-type transformers rated over ________ volts shall be installed in a vault
    complying with part 4.50.3
    35 000 volts
  29. Section 4.90.5
    Electrode-Type Boiler. (Ground
    Current Detection). Means shall provided for detection of the sum of the neutral and
    ground currents and shall trip the circuit interrupting device if the sum of those currents exceeds the
    greater of5 amperes or ________ percentof
    the boiler  full load current for ________ seconds or exceeds an instantaneous value of 25percent
    of the boiler full load current
    • 7 ½ percent
    • 10 seconds
  30. Section 4.90.5
    Electrode-Type Boiler. (Ground
    Current Detection). Means shall provided for detection of the sum of the neutral and ground
    currents and shall trip the circuit interrupting device if the sum of those currents exceeds the greater of         ________amperes or 7 ½ percentof the
    boiler  full load current for 10 seconds
    or exceeds an instantaneous value of ________ percent of the boiler full load
    current
    • 5 Amperes ,  25
    • percent
  31. A separate overload
    relay
    protecting a single motor-compressor against overload and failure to start
    shall be selected to trip at not more than ________ percent of the
    motor-compressor rated-load current
    140 percent
  32. The  ________ markings
    of cord and plug connected equipment
    rated not greater than 250 volts, single
    phase, such as household refrigerators and freezers, Drinking
    water cooler and beverage dispenser, shall be used in determining
    the branch circuits requirements and each unit shall be considered as a  ________
    unless the nameplate is marked otherwise
    • Nameplate Markings
    • Single Motor
  33. The
    ampere rating of hermetic refrigerant motor-compressor’s disconnecting means shall be at least ________ percent of the
    rated-load current or branch circuit selection current, whichever is greater
    115 percent
  34. A  room air conditioner shall be considered as
    a  ac appliance unit in determining its branch circuits and its rating is not more than ________ ampere and ________ volts
    • 40 ampere
    • 250 volts
  35. Where
    live parts of motors or controllers operating at over 150 volts to ground
    are GUARDED against accidental contact only by location as specified
    in  section 4.30.12.2 and where
    adjustments or other attendance maybe necessary during the operation of the
    apparatus, suitable ________ or ________ shall be provided so that the
    attendant cannot readily touchlive parts unless standing on the MATS or PLATFORMS
    INSULATING MATS  or   PLATFORMS
  36. Ultimate trip current of overcurrent
    (overload) relays or other motor protective devices used for the motor control
    apparatus shall not exceed ________ percent of the controllers continuous
    current rating
    115 percent
  37. Where
    the motor branch circuit disconnecting means is separate from the controller,  the disconnecting means current rating shall
    not be less than the  ________ setting of
    the overcurrent relays in the circuit
    115 percent
  38. Flexible metal
    conduit or
    liquid tight Flexible metal conduitnot
    exceeding  ________ mm in length shall be
    permitted to be employed for raceway connection to a motor terminal
    enclosure
    1800 mm
  39. (GENERAL) :       The disconnecting means  for motor circuits rated 600 volts, nominal
    or less, shall have an ampere rating of at least   ________ percent of the full-load current
    rating of the motor
    115 percent
  40. GENERAL : ( Exception)     a
    listed non-fused motor circuit switch having a horse power rating equal to or
    greater than the motor horse power shall be permitted to have an ampere rating
    less than ________ percent of the full-load current rating of the motor
    115  percent
  41. Disconnecting
    means for torque motors shall
    have an ampere rating of at least 
    ________ percent of the motors
    nameplate current
    115  percent
  42. Disconnecting
    means for torque motors shall
    have an ampere rating of at least 115
    percent of the motors  ________
    Nameplate current
  43. In phase arrangements of Bus
    Bars and Conductors, the
    ________ phase shall be that phase having the HIGHER VOLTAGE to ground on 3-phase, 4wire delta-connected
    system
    B  phase
  44. In phase arrangements of Bus
    Bars and Conductors, the   “B   phase”  
    shall be that phase having the ________on 3-phase, 4wire
    delta-connected system
    Higher Voltage to Ground
  45. In phase arrangements of Bus
    Bars and Conductors, the “B   phase”  
    shall be that phase having the HIGHER
    VOLTAGE to ground on 
    ________system
    3-phase, 4wire delta-connected
  46. The
    phase arrangement on 3-phase horizontal common power and vertical buses shall
    be  ________,  ________, ________ from Front to Back,
    Top to Bottom or Left to Right , as viewed from the front of the
    Motor Control Center
    A,  B,  C
  47. The
    phase arrangement on 3-phase horizontal common power and vertical buses shall
    be   A,  B,   C  from Front to Back,Top to BottomorLeft
    to Right , as viewed from the________ of the Motor Control Center
    FRONT
  48. The
    phase arrangement on 3-phase horizontal common power and vertical buses shall
    be  A,  B,  C
    from________,  ________, ________  , as viewed from the front of the Motor Control Center
    • Front to Back
    • Top to Bottom or
    • Left to Right
  49. (Exception)  :Rear-mounted
    units connected to vertical bus that is common to front- mounted units,  shall be permitted to have a ________
    phase arrangement where properly
    identified
    C,  B,  A phase arrangement
  50. Where
    used as service equipment,  each motor
    control center shall be provided with a single main disconnecting means to disconnect all ________ service
    conductors
    UNGROUNDED Service Conductor

What would you like to do?

Home > Flashcards > Print Preview