17th Edition (2382-12) Online Exam Simulator

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 17th Edition (2382-12) Online Exam Simulator
17th Edition (2382-12) online exam simulator. 60 questions in 2 hours. Questions written by professional course tutor. Practice for the actual online 17th edition exam.

  
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  • 1. 
    Requirements are included in BS 7671 for electrical installations of
    • A. 

      Lift installations

    • B. 

      Mobile offshore electrical systems

    • C. 

      Distributor's networks

    • D. 

      Locations containing a bath or shower


  • 2. 
    Which of the following is excluded from the scope of BS 7671?
    • A. 

      Cabins containing sauna heaters

    • B. 

      Fountains

    • C. 

      Highway power supplies

    • D. 

      Lightning protection


  • 3. 
    Which of the following is not included in BS 7671?
    • A. 

      Demolition site installations

    • B. 

      Electric fences

    • C. 

      Medical locations

    • D. 

      Motor caravans


  • 4. 
    Which of the following documents is non-statutory?
    • A. 

      Electricity Safety, Quality and Continuity Regulations

    • B. 

      Electricity at Work Regulations

    • C. 

      The Building Regulations

    • D. 

      Requirements for Electrical Installations


  • 5. 
    Protective equipotential bonding is achieved by
    • A. 

      Preventing current from passing through the body

    • B. 

      Ensuring adequate continuity between extraneous conductive parts

    • C. 

      Automatic disconnection of supply in the event of a fault

    • D. 

      Separation of equipment from the supply using a safety isolating transformer


  • 6. 
     The type of earthing arrangements requiring a consumer’s earth electrode to be installed is where 
    • A. 

      No earth facility is supplied by the distributor

    • B. 

      The supply is from a low voltage generator

    • C. 

      Earthing is via the distributor’s cable armour

    • D. 

      The electrical system is TN-C


  • 7. 
    Low-voltage is defined in BS 7671 as having a value exceeding
    • A. 

      24V ac

    • B. 

      48V ac

    • C. 

      50V ac

    • D. 

      120V ac


  • 8. 
    Tables showing the classification of external influences when considering environmental conditions during the design of an installation can be found in BS 7671
    • A. 

      Chapter 32

    • B. 

      Chapter 53

    • C. 

      Appendix 4

    • D. 

      Appendix 5


  • 9. 
    An assessment must be made of harmful effects on other electrical systems when installing
    • A. 

      Large electric motors

    • B. 

      Fire alarm systems

    • C. 

      Emergency lighting circuits

    • D. 

      Reduced low voltage supplies


  • 10. 
    For a 32A ring final circuit in similar premises to a dwelling, the minimum size of thermoplastic insulated copper live conductors allowed is
    • A. 

      1.0mm2

    • B. 

      1.5mm2

    • C. 

      2.5mm2

    • D. 

      4.0mm2


  • 11. 
    In a domestic dwelling a 32A ring final circuit incorporating BS 1363 socket-outlets historically serves a floor area up to
    • A. 

      75m2

    • B. 

      100m2

    • C. 

      50m2

    • D. 

      200m2


  • 12. 
    The following final circuits are to be installed using thermoplastic insulated multicore non-armoured cables 3 x 6A lighting                      1 x 20A UPS supply                             3 x 32A ring                           1 x 40A cooker   If the cables are enclosed in a non-metalic trunking where entering the distribution board, how many live conductors would be enclosed?
    • A. 

      9

    • B. 

      16

    • C. 

      22

    • D. 

      32


  • 13. 
    The required current carrying capacity of a three-phase circuit conductor Iz  is 26A.  From the correct table, the minimum size of three single-core thermoplastic covered, heavy duty MICC cables, installed flat on a perforated cable tray and spaced by two cable diameters is
    • A. 

      1.0mm2

    • B. 

      1.5mm2

    • C. 

      2.5mm2

    • D. 

      4.0mm2


  • 14. 
    Which of the following is not a characteristic of the supply?
    • A. 

      Nominal voltage

    • B. 

      frequency

    • C. 

      Earth loop impedance Ze

    • D. 

      Power factor


  • 15. 
    The requirements for mobile or transportable units are applicable to the following types of unit
    • A. 

      Health screening services

    • B. 

      Pleasure craft

    • C. 

      Mobile machinery to BS EN 60204-1

    • D. 

      Traction equipment of electric vehicles


  • 16. 
    Basic protection by means of obstacles is intended to prevent 
    • A. 

      Ordinary persons from operating equipment

    • B. 

      Intentional contact with exposed parts

    • C. 

      Intentional bodily approach to a live part

    • D. 

      Unintentional bodily approach to a live part


  • 17. 
    Which of the following is a method of fault protection?
    • A. 

      Electrical separation

    • B. 

      Barriers or enclosures

    • C. 

      Insulation of live parts

    • D. 

      Placing out of reach


  • 18. 
     The value of the external earth loop impedance Ze  can be obtained by measurement at
    • A. 

      The supply point and subtracting the value of internal loop impedance (R1 + R2)

    • B. 

      The furthest socket-outlet from the supply

    • C. 

      The origin of supply

    • D. 

      both the supply and at the furthest socket-outlet, and subtracting one result from the other


  • 19. 
    In a TN system, final circuits not exceeding 32A supplying fixed equipment are subject to a maximum disconnection time of
    • A. 

      0.4s

    • B. 

      0.8s

    • C. 

      4.0s

    • D. 

      5.0s


  • 20. 
    The temperature limit for metalic equipment which is intended to be touched but not hand-held is
    • A. 

      30 degrees Celsius

    • B. 

      55 degrees Celsius

    • C. 

      65 degrees Celsius

    • D. 

      70 degrees Celsius


  • 21. 
    Overload current is defined as an overcurrent
    • A. 

      Due to low insulation resistance

    • B. 

      In a circuit which is electrically sound

    • C. 

      Due to a fault of negligible impedance

    • D. 

      In a line conductor in contact with earth


  • 22. 
    The prospective fault current at the origin of a single-phase installation is the greater of the prospective
    • A. 

      Maximum demand and diversity value

    • B. 

      Short circuit and overload current

    • C. 

      Design current and distributor’s main fuse

    • D. 

      Short circuit and earth fault currents


  • 23. 
    To meet the requirements of BS 7671, all overcurrent devices without upstream backup protection must
    • A. 

      Be rated lower than the design current

    • B. 

      Meet the requirements of BS 7846

    • C. 

      Be able to withstand the prospective fault current

    • D. 

      Not operate due to a line to earth fault


  • 24. 
    Which of the following devices can not be used for emergency switching?
    • A. 

      A push-button controlling an all-pole contactor

    • B. 

      A manually operated switch

    • C. 

      A circuit-breaker

    • D. 

      A luminaire support coupler


  • 25. 
    Which of the following arrangements of a firefighter’s switch controlling a discharge lighting installation would comply with BS 7671?
    • A. 

      Switch with off position at the bottom and mounted at 2.75m from the ground

    • B. 

      Switch with off position at the top and mounted at 3.75m from the ground

    • C. 

      Switch with off position at the bottom and mounted at 3.75m from the ground

    • D. 

      Switch with off position at the top and mounted at 2.75m from the ground


  • 26. 
    Where overvoltage protection is to be provided in a household appliance, the minimum impulse withstand voltage for Category II equipment would be
    • A. 

      1.5kV

    • B. 

      2.5kV

    • C. 

      4.0kV

    • D. 

      6.0kV


  • 27. 
    In locations with risk of fire due to the nature of processed or stored materials (conditions BE2), a wiring system which requires protection by a suitably rated RCD is
    • A. 

      Overhead busbar trunking

    • B. 

      Powertrack systems

    • C. 

      90 degrees Celsius thermosetting cables

    • D. 

      MICC cables


  • 28. 
    Which of the following external influences would likely require an increase in the current rating of cables above that normally required?
    • A. 

      Exposure to flooding

    • B. 

      An ambient temperature below 0 degrees Celsius

    • C. 

      Exposure to mechanical damage

    • D. 

      An ambient temperature of 40 degrees Celsius


  • 29. 
    Precautions must be taken against the spread of flammable liquid from electrical equipment such as a transformer, if the liquid is
    • A. 

      Less than 25 litres in capacity

    • B. 

      Of a type where combustion produces smoke and gas

    • C. 

      Of quantity 25 litres and above

    • D. 

      In a location under supervision of instructed persons


  • 30. 
    The symbol used to denote the rating or setting of a protective device is
    • A. 

      I2

    • B. 

      In

    • C. 

      Ib

    • D. 

      Iz


  • 31. 
    For 5-core flexible cables in three-phase four wire systems, the alphanumeric marking of conductors as L1, L2,  L3 and N would correspond to the following conductor colour identification in accordance with BS 7671 
    • A. 

      Brown, black, black, blue

    • B. 

      Black, brown, grey, blue

    • C. 

      Brown, black, grey, blue

    • D. 

      Brown, blue, grey, black


  • 32. 
    At which of the following protective conductor terminations would a warning notice not need to be fixed
    • A. 

      An earth electrode

    • B. 

      A connection to exposed structural metalwork

    • C. 

      A gas service metal pipe

    • D. 

      Main earthing terminal in a distribution board


  • 33. 
    A device capable of making and breaking load current and automatically breaking fault current is a
    • A. 

      BS 88-2 fuse

    • B. 

      Residual current device to BS EN 61008

    • C. 

      Circuit-breaker

    • D. 

      Disconnector


  • 34. 
    Extraneous-conductive-parts require protective equipotential bonding to ensure that
    • A. 

      The exposed parts are isolated from earth

    • B. 

      No dangerous potential difference can occur

    • C. 

      Utility pipes can be used as earth electrodes

    • D. 

      No connection with a cpc is required


  • 35. 
    Where the supply to a caravan park is PME, a TT system of earthing must be used in the supply to
    • A. 

      Underground cables

    • B. 

      Pitch socket-outlets

    • C. 

      Lighting circuits

    • D. 

      Instantaneous water heaters


  • 36. 
    Except where PME conditions apply, main protective bonding conductors shall have a cross-sectional area not less than
    • A. 

      Half the c.s.a. of the earthing conductor of the installation subject to a minimum of 6.0mm2

    • B. 

      The c.s.a. of the earthing conductor of the installation subject to a minimum of 6.0mm2

    • C. 

      Twice the c.s.a. of the earthing conductor

    • D. 

      Half the c.s.a. of the earthing conductor of the installation subject to a minimum of 10.0mm2


  • 37. 
    When using a Class II electric drill outdoors, BS 7671 requires that
    • A. 

      The earth loop impedance at the drill is not less than that shown in Table 41.1

    • B. 

      It is supplied from a BS EN 60898 protected socket-outlet

    • C. 

      An earth connection is made to the drill casing

    • D. 

      It is supplied from an RCD protected socket-outlet


  • 38. 
    A 13A socket outlet in a garage of a domestic dwelling must have the following
    • A. 

      Basic protection, fault protection and RCD protection not exceeding 30mA

    • B. 

      Protection by a 30mA RCBO

    • C. 

      Basic protection and additional protection

    • D. 

      Ingress protection to IP56


  • 39. 
    Socket-outlets supplying 230V equipment used in the garden must be protected by a residual current device.  This device is fitted because the equipment is being used 
    • A. 

      Within the equipotential zone and requires additional protection

    • B. 

      Where the earth loop impedance Zs can not be determined

    • C. 

      Where the overload tripping time exceeds 5 seconds

    • D. 

      Outside the equipotential zone and requires additional protection


  • 40. 
    Starters incorporating overload protection must be provided for electric motors with a rating exceeding
    • A. 

      3.7W

    • B. 

      37W

    • C. 

      0.37kW

    • D. 

      3.7kW


  • 41. 
    The circuit of a safety service should be
    • A. 

      Coloured red

    • B. 

      Independent of any other circuit

    • C. 

      Housed in compartmentalised trunking

    • D. 

      Unprotected


  • 42. 
    Where an installation and generator are not permanently fixed, every circuit must be protected by a residual current device with a maximum I∆n rating of
    • A. 

      10mA

    • B. 

      30mA

    • C. 

      100mA

    • D. 

      500mA


  • 43. 
    In Zone 1 of a bathroom, the following fixed equipment may not be installed
    • A. 

      Whirlpool units

    • B. 

      Towel rails

    • C. 

      Shaver supply units

    • D. 

      luminaires


  • 44. 
    The correct temperature rating of the insulating material for flexible cables installed in a hot air sauna is?
    • A. 

      60 degrees Celsius

    • B. 

      105 degrees Celsius

    • C. 

      90 degrees Celsius

    • D. 

      170 degrees Celsius


  • 45. 
    A reduced low-voltage supply is strongly preferred on a construction site to supply portable equipment with a loading less than
    • A. 

      0.375kW

    • B. 

      1.0kW

    • C. 

      2.0kW

    • D. 

      3.75kW


  • 46. 
    In agricultural premises, a residual current device is required for protection against fire.  The RCD operating current must not exceed
    • A. 

      30mA

    • B. 

      150mA

    • C. 

      300mA

    • D. 

      500mA


  • 47. 
    The main wiring installed in a frequently used touring caravan should preferably be inspected and tested at intervals not exceeding
    • A. 

      1 year

    • B. 

      3 years

    • C. 

      5 years

    • D. 

      Change of owner


  • 48. 
    The maximum disconnection time for circuits supplying fixed equipment used in highway power supplies is
    • A. 

      0.1s

    • B. 

      0.4s

    • C. 

      0.5s

    • D. 

      5.0s


  • 49. 
    Where a protective conductor current is likely to be 15mA in a ring final circuit, it must be provided with
    • A. 

      Protective conductors of minimum csa 2.5mm2

    • B. 

      A high integrity protective conductor connection

    • C. 

      Connection to the supply via a PME facility

    • D. 

      Connection via socket-outlets to BS EN 60309


  • 50. 
    Which of the following requirements is not part of the inspection of fixed equipment, when inspecting and testing an installation in accordance with BS 7671?
    • A. 

      Presence of BS mark or certification

    • B. 

      Correct selection and erection

    • C. 

      No visible damage

    • D. 

      Type acceptable to the electrical distributor


  • 51. 
    A legible diagram, chart or table relating to an installation must provide information
    • A. 

      Necessary for testing the characteristics of protective devices

    • B. 

      Necessary for the identification of protective devices

    • C. 

      Detailing the maximum earth fault loop impedance values

    • D. 

      That enables the maximum demand to be determined


  • 52. 
    A test simulating a fault condition would be used when testing
    • A. 

      Residual current devices

    • B. 

      Polarity

    • C. 

      Insulation of non-conducting floors

    • D. 

      Insulation resistance


  • 53. 
    In agricultural and horticultural premises all circuits other than for socket-outlets must be protected by an RCD with an operating current not exceeding
    • A. 

      30mA

    • B. 

      300mA

    • C. 

      500mA

    • D. 

      1.0A


  • 54. 
    The test voltage required to carry out an insulation resistance test on an installation where the nominal supply voltage is 750V is
    • A. 

      250V dc

    • B. 

      500V dc

    • C. 

      1000V dc

    • D. 

      1500V dc


  • 55. 
    No alteration, temporary or permanent, shall be made to an existing installation unless the   
    • A. 

      Electricity distributor has been informed

    • B. 

      Building Control has been informed

    • C. 

      Existing equipment is adequate for any additional load

    • D. 

      Existing equipment meets UL and CSA standards


  • 56. 
    A signed Electrical Installation Certificate must indicate responsibility for the installation’s
    • A. 

      Design, construction, inspection & testing

    • B. 

      Design, material standards and construction

    • C. 

      Construction, environment and design

    • D. 

      IP Ratings, design, inspection & testing


  • 57. 
    An Electrical Installation Condition Report together with appropriate schedules shall be given to the
    • A. 

      Original installer

    • B. 

      Person ordering the inspection

    • C. 

      Representative of the distributor

    • D. 

      Installation designer


  • 58. 
    Which of the following classifications of external influence would be appropriate for electrical equipment installed where subject to ‘splashes of water’?
    • A. 

      AB

    • B. 

      BC1

    • C. 

      AD4

    • D. 

      AG1


  • 59. 
    If a 63A BS 88-2 protective device operates 5 seconds after a fault develops, the approximate value of fault current will be
    • A. 

      30A

    • B. 

      63A

    • C. 

      280A

    • D. 

      500A


  • 60. 
    Trunking is required to carry the cables of six three-phase circuits.  When determining the live conductor csa, which of the following grouping factors would be used?
    • A. 

      0.39

    • B. 

      0.45

    • C. 

      0.57

    • D. 

      0.69


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