PEC - Random Questions 2

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Camskie
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305011
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PEC - Random Questions 2
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2015-08-03 08:54:25
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PEC - Random Questions
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  1. Phase
    converter without rotating parts
    sized for a given 3-phase load to permit operation from a single phase
    supply
    STATIC-PHASE CONVERTER
  2. 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
  3. 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
  4. 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
  5. The
    floors of transformer vaults in contact with the earthshall be of concrete that is not less than  _____mm thick
    100 mm thick
  6. 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
  7. The
     floors of transformer vaults in
    contact with the earth shall be of ________that is not less than 100mm thick
    CONCRETE
  8. (EXCEPTION:)   Where transformers are protected with automatic sprinkler, water spray, carbon dioxide, or halon, construction of  ________ hour 
    rating shall be permitted
    1 HOUR
  9. FPN No. #2    A typical 3-hour constructionof 
    transformer vaults  walls,  roof, 
    and   floors is  ________ mm thick             reinforced concrete
    150 mm thick
  10. Each
    doorways leading into a transformer
    vault from the building interior shall be provided with a ________  fitting door
    TIGHT fitting door
  11. Each
    doorways leading into a transformer
    vault from the building interior shall be provided with a  tight fitting door that has  a minimum fire rating of ________  hour
    3 HOURS
  12. A doorsill or curb that is of sufficient height to confine the oil from the
    largest transformer within the vault shall be provided, and in no case
    shall the height be less than ________mm
    100 mm
  13. A
    ________or ________ that is of sufficient height to confine the oil from the
    largest transformer within the vault shall be provided, and in no case shall the height be less than
    100 mm
    DOOR SILL  or  CURB
  14. Ventilation openings of transformer’s vault  shall be located as ________  as possible from doors, windows, fire escapes and combustible materials
    FARAWAY
  15. A transformer vault ventilated  by natural circulation of airshall be
    permitted to have  roughly  ________ of the total area of the openings
    required for ventilation
    HALF
  16. A transformer
    vault ventilated  by natural circulation
    of air shall be permitted to have 
    roughly  halfof the total area of the openings required for
    ventilation in one or more openings near 
    the ________ and the remainder
    in one or more openings in the ________ or in the sidewalls near the roofs or all of the area required for
    ventilation, shall be permitted in one or more openings in or  near the roof
    • Floors
    • Roofs
  17. For
    a transformer vault  ventilated  by natural circulation of air to an outdoor
    area, the combined net area of all ventilating openings after deducting the
    area occupied by screen, gratings, or louvers, shall not
    be less than  ________ cm2 per KVA of transformer capacity in
    service
    20 cm2 per KVA
  18. For a transformer vault  ventilated 
    by natural circulation of air to an outdoor area, the combined net
    area of all ventilating openings after deducting the area occupied by screen, gratings, orlouvers,
    shall not be less than 20 cm2 per KVA
    of transformer capacity in service, and in no case shall the net area be
    less than 1000cm2 for any capacity under
    ________
    50 KVA
  19. 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
  20. 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
  21. Practicable
    , transformer vaults containing more
    than  ________ KVAtransformer capacity shall be provided with drain or other means that will carry off any accumulation
    of oilor  water
    in the vault    unless  local condition make this impracticable
    100  KVA
  22. 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
  23. Any
    Pipe or duct system foreign to the electrical installation shall not enter
    or pass through a transformer vault. 
    Piping or other facilities
    provided for vault fire protection or for transformer cooling, shall ________considered   foreign to the
    electrical installation
    SHALL   NOT   BE
  24. Where
    the loads to be supplied are variable,
    the Conductor Ampacityshall be set
    at not more than ________ percent of the phase converter nameplate single phase
    input full load amperes
    125 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 currentshall 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. Dry-type transformers installed indoors and rated 112  ½ KVA   or   less shall have a separation of at
    least ________  mm from combustible
    material unless separated from combustible material by a fire resistant heat
    insulated barrier
    300 mm
  29. Individual Dry-type transformers  of  more than  
    112  ½ KVA rating shall be installed in a  ________of 
    fire-resistant construction
    Transformer room
  30. Unless
    specified otherwise in article 4.50 Transformers  and 
    Transformers  vaults(including SECONDARY TIES)   the term FIRE RESISTANT means a construction
    having a minimum fire rating  
    of  ________hour
    1  HOUR
  31. Dry-type transformers rated over 35 000 volts shall be installed in a ________ complying
    with part 4.50.3
    in a VAULT
  32. Dry-type
    transformers installed outdoors shall have a ________ enclosure
    Weatherproof enclosure
  33. Transformer
    exceeding  112 
    ½   KVAshall not be located
    within 300mm of combustible materials of buildings unless the transformer
    has ________ insulation systems or higher and is completely enclosed
    except for ventilating openings
    CLASS 155 insulation system
  34. Oil – insulated transformer installed indoors shall be installed in a vaultconstructed as specified in part 4.50.3.
    Exception, where the nominal voltage does not exceed ________ volts a vault shall not be required
    600 volts
  35. Grounding
    autotransformer  covered by
    section4.50.1.5 are ________ or ________ transformer connected to 3-phase, 3
    wire ungrounded system
    ZIGZAG    or     T- Connected   transformers
  36. 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 a  ________ distribution
    system
    3-phase , 4 wire distribution system
  37. 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 a3-phase , 4 wire distribution system or to provide a ________
    reference for grounding purposes
    Neutral reference
  38. The
    autotransformer shall have a continuous
    ________ rating that is sufficientto
    handle the maximum possible neutral
    unbalanced load current  of  the  4
    wire system
    Neutral-Current rating
  39. 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
  40. 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
  41. Each auto transformer 600 volts, nominal 
    or  less shall be protected
    by an individual over current device installed
    in serieswith each ungrounded inputconductors.  Such over current device shall be rated or
    set at not more than ________percent of the rated full load input current of
    the transformer
    125 percent
  42. Voltage
    transformers  installed indoors or
    enclosed shall be protected with ________
    Primary Fuses
  43. (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
  44. 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
  45. 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
  46. 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
  47. The
    overload sensing device shall
    ________ permitted to be connected to an annunciator  oralarm supervised by authorized
    personnel instead of interrupting the generator circuit
    shall  BE  permitted
  48. A  room air conditioner (with or  without provisions for heating) shall be
    considered as an ________ of the air cooled window, console, or
    in wall type that is installed in the conditioned room and that incorporates
    a hermetic refrigerant motor-compressor
    AC appliance
  49. 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
  50. 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

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