PEC - Random Questions 4

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Camskie
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305040
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PEC - Random Questions 4
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2015-08-03 08:52:56
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PEC - Random Questions 4
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  1. A Controller is any switch or device that
    is normally used to Start  andStopa
    motor by ________ and ________ the motor circuit current
    • MAKING and
    • BREAKING
  2. A
    ________is any switch or device that is normally used to Start  andStopa motor by   Making  and   Breaking   the motor circuit current
    CONTROLLER
  3. Any
    motor application shall be considered to be for 
    ________ duty unless the nature of the apparatus it drives is such that
    the motor cannot operate continuously with load under any condition of use
    CONTINUOUS DUTY
  4. ________
    in electrical apparatus is an operating 
    OVERCURRENT    that, when it
    persist for a sufficient length of time, would cause damage or dangerous
    overheating of the apparatus
    OVERLOAD
  5. It does not include  Short circuits  or Ground faults in electrical apparatus
    OVERLOAD
  6. OVERLOAD  in electrical apparatus is an operating  ________  
    that, when it persist for a sufficient length of time, would cause
    damage or dangerous overheating of the apparatus. It does not include  Short
    circuits  or Ground faults in electrical
    apparatus
    OVERCURRENT
  7. For continuous duty,  the conductors
    connecting thesecondary of a wound-rotor ac motorto its controller
    shall have an ampacity not less than ________ percent of the full-load
    secondary current of the motor
    125 percent
  8. Conductors supplying
    several motors, or a motor(s) and other loads shall have an ampacityat least equal to the sum of the  ________ of all the motors, plus 
    ________ percent of the highest rated motor in the group, plus the ampere ratings of the  Other loadsdetermined in accordance with
    article 2.20 and other applicable article
    • Full-Load currents
    • plus  25  percent
  9. Motor of larger ratings or Over 1 Horsepower
    shall be permitted to be connected to General-Purpose branch circuits only where,  ________ motor is protected by overload protection selected to protect the motor as specified in section 4.30.3.2
    EACH motor
  10. Where
    fuses are used for motor overload protection, a fused shall be inserted in each
    ungrounded conductor and also in the grounded conductor if the
    supply system is ________
    3-phase,  3wire AC    with   One conductor  GROUNDED
  11. Control circuit
    devices with screw-type pressure terminals used with 2.0mm2 or smaller copper
    conductors shall be torque to a minimum ________ N-m,      unless identified for different torque value
    0.79  N-m
  12. Control circuit
    devices
    with screw-type pressure terminals used with ________mm2 or smaller copper conductors shall
    be torque to a minimum ________ N-m,     
    unless identified for different torque value
    • 2 .0 mm2
    • 0.79  N-m
  13. Metal-Enclosed Switchgear and Substation that utilize high-voltage fuses shall be provided with a  ________ Disconnecting switch
    Gang-Operated
  14. Where
    fuses are used for motor overload protection, a fused shall be inserted in each
    ungrounded conductor and also in the grounded conductor if the
    supply system is ________
    3-phase,  3wire AC    with   One conductor  GROUNDED
  15. Conductors supplying
    several motors, or a motor(s) and other loads shall have an ampacityat least equal to the sum of the  ________ of all the motors, plus 
    ________ percent of the highest rated motor in the group, plus the ampere ratings of the  Other loadsdetermined in accordance with
    article 2.20 and other applicable article
    Full-Load currents  plus  25  percent
  16. ________
    in electrical apparatus is an operating 
    OVERCURRENT    that, when it
    persist for a sufficient length of time, would cause damage or dangerous
    overheating of the apparatus
    OVERLOAD
  17. (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
  18. 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
  19. Disconnecting
    means for torque motors shall
    have an ampere rating of at least 
    ________ percent of the motors
    nameplate current
    115 percent
  20. 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
  21. 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
  22. A FAULT –SENSING  system that will cause the opening of the
    main switch or common trip overcurrent device for the3-phase, 4wire system shall be provided to guard
    against________ or ________
    Single phasing or Internal faults
  23. The
    total marked rating of a cord and attachment plug-connected room air
    conditionershall not exceed
    ________ percent of the rating of the branch circuit where no other loads are supplied
    80  percent
  24. The
    total marked rating of a cord and attachment plug-connected room air
    conditionershall not exceed
    ________ percent of the rating of the branch circuit where lighting units or other appliance are also supplied
    50  percent
  25. Where
    the phase converter supplies specific
    fixed loads, and the conductor ampacity
    is less than 125 percent of the phase converter nameplate single
    phase input full load amperes, the conductors shall have the ampacity not
    less than  ________ percent  of the sum of the Full Load,  3-phase current ratings of the motors
    and other loads served
    where  the Input and  Output voltages of the phase converter
    are ________
    • 250 percent
    • IDENTICAL
  26. Where
    the phase converter supplies specific
    fixed loads,  the conductor ampacity is less than 125 percent
    of the phase converter nameplate single phase input full load amperes
    and the input and output voltages are different, the current shall be
    multiplied by the ratio of  ________  to  
    ________voltage
    OUTPUT   TO   INPUT   voltage
  27. ________   is a circuit operating at 600volts, nominal,
    or  less, between  phases that connects two power sources or power supply points, such as the secondary’s  of  two  transformer
    SECONDARY TIES
  28. All transformer vault  ventilation
    openings to the indoors shall be provided with automatic
    closing ________ dampers that operates
    in response to a vault fire.
    FIRE DAMPERS
  29. All transformer vault  ventilation
    openings to the indoors shall be provided with automatic
    closing fire dampersthat operates in response to a vault fire. Such
    damper shall possess a standard fire
    rating of not less than ________ hour
    1  ½ hour
  30. Practicable
    , transformer vaults containing more
    than  ________ KVAtransformer capacity shall be provided with drain or other means that will carry off any accumulation
    of oil   or  water in the vault    unless 
    local condition make this impracticable
    100  KVA
  31. Practicable
    , transformer vaults containing more
    than  100KVAtransformer capacity
    shall be provided with drain
    or other means that will carry off any accumulation of ________  or ________ in the vault  unless  local condition make this impracticable
    Oil    or    Water
  32. (EXCEPTION) :   where the rated INPUT current of the auto transformer is less than ________
    amperes  an over current device rated or
    set at not more than 167 percentof
    the input current shall be permitted
    9  Amperes
  33. An
    over current device shall not be
    installed in series with the ________ windings  ( the windings common to both the input and
    the output circuits ) of the auto transformer between points A and B
    Shunt Windings
  34. Live parts of
    generators operated at more than ________ volts
    to ground shall not be exposed to accidental contact where accessible to
    unqualified persons
    50 Volts
  35. The
    ampacity  of 
    the  conductors from the
    generators terminal to the first over current device shall not  be less than ________ percent of the
    nameplate current of the generator
    115  percent
  36. Section 4.90.3.9 Door
    stops and Cover Plates. External hinged doors at cover shall be provided with stops to hold them in the open
    position. Cover plates intended to be removed for inspection of energized parts
    or wiring shall be equipped with lifting handled and shall not exceed in area
    _____ or  27kg in weight unless they are hinged and bolted or locked
    1.2m²
  37. The
    ampacity of conductors that connect a
    capacitor to the terminals of the motor or to motor circuit conductors shall not 
    be less than _____ the ampacity of the motor circuit conductors and in
    no case shall be less than 135 percent of the rated current  of the capacitor
    ONE - THIRD
  38. The
    walls and roofs of vaults shall be constructed of materials that
    have structural strength for the conditions with a  minimum
    fire resistance of  _____ hours
    3 HOURS
  39. The  floors of transformer vaults in
    contact with the earth shall be of concrete
    that is not less than  _____mm thick
    100 mm thick
  40. But
    where The transformer vault  is constructed with a vacant space
    or other stories below it,
    the floor shall have adequate structural strength for the load imposed thereon
    and a minimum fire resistance of  _____
    hours
    3 HOURS
  41. The
     floors of transformer vaults in
    contact with the earth shall be of ________ that is not less than 100mm thick
    CONCRETE
  42. The
    value of branch-circuit selection current 
    willalways be Equal to  or  Greater than the marked ________ current
    Rated-load current
  43. 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
  44. 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 ________.
  45. The
    autotransformer shall have a continuous
    ________ rating that is sufficient
    to handle the maximum possible
    neutral unbalanced load current 
    of  the  4 wire system
    Neutral-Current rating
  46. The autotransformer shall have a ContinuousNeutral-Current rating that
    is sufficient to handle the maximum possible neutral unbalanced load current 
    of  the   ________.
    4 Wire System
  47. Each auto transformer 600 volts, nominal 
    or  less shall be protected
    by an individual over current device installed
    in serieswith each ungrounded 
    ________ conductors
    INPUT conductors
  48. Grounding
    auto transformer  covered by
    section4.50.1.5 are ZIGZAG     or    
    T- Connected  transformerconnected to 3-phase, 3 wire ungrounded system
    for the purpose of creating a  ________ distribution system
    3-phase , 4 wire distribution system
  49. Grounding auto transformer  covered by section4.50.1.5  are   ZIGZAG     or     T- Connected  transformer   connected to 3-phase,  3 wire ungrounded system for the purpose of creating a3-phase , 4 wire distribution
    system or to provide a ________ reference for grounding purposes
    Neutral reference
  50. Controllers enclosures shall be grounded regardless of  
    ________
    regardless of VOLTAGE

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