1) The British standard relevant to the 18th Edition of the IEE wiring regulations is a) BS 6700 b) BS 6891 c) BS 7671 d) BS 8000. 2) Details of the wiring requirements for the controls of a fully pumped heating system can be found in the a) British Standard 6700 b) Manufacturer’s catalogues c) WRAS guide d) Building Regulations. 3) A branch from a ring final circuit is usually described as a a) Socket outlet b) Spur c) Consumer unit d) Residual current device. 4) Which one of the following must be connected by an unswitched fused spur socket outlet? a) Room thermostat. b) Central heating boiler. c) Central heating pump. d) Macerator WC. 5) The circuit breaker rating, in amps, for an 8 kW instantaneous electric shower would be a) 6 b) 16 c) 32 d) 40. 6) The main connection to an immersion heater should come directly from the a) Fused spur outlet b) Junction box c) Consumer unit d) Ring main. 7) The method of earthing all exposed metal pipe work in a domestic dwelling is called a) Equipotential bonding b) Earthing conductivity bonding c) Temporary earth continuity bonding d) Earth leakage detection bonding. 8) The electric meter to a domestic property is the responsibility of the a) Power supply company b) Consumer c) Local Authority d) NICEIC. 9) To test if an electric circuit is live, a plumber should use a) An electromagnetic MCB b) A neon screw driver c) A home made test lamp d) An approved voltage indicating device. 10) The size of the cable between the double pole switch and an immersion heater, should be a) 1.5 mm² twin and earth b) 2.5 mm² heat resistant flex c) 6 mm² heat resistant flex d) 6 mm² twin and earth. 11) A transformer is a device that steps up or down the a) Amperage from an ac supply b) Voltage from a dc supply c) Voltage from an ac supply d) Amperage from a dc supply. 12) Which one of the following is a suitable switching arrangement when sited in a bathroom to control an electric shower? a) Single pole pull cord switch. b) Single pole wall switch. c) Double pole wall switch. d) Double pole pull cord switch. 13) The colour coding of the wiring in a modern three-core flex is made up of, blue, yellow and green, and a) Brown b) Red c) Black d) White. 14) The size of cable used for a main bond between the cold water service pipe work and the main earthing point at the distribution board, is a) 1.5 mm² b) 2.5 mm² c) 6 mm² d) 10 mm² 15) Plastic clips for fixing electric cable in domestic dwellings are normally secured using a) Clout nails b) Masonry nails c) Brass screws d) Panel pins. 16) Where a cable is to be concealed in plaster, it should be a) Buried to a depth of at least 25 mm b) Encased in grade D metal conduit c) Wrapped in water proof insulating tape d) Covered in plastic or metal sheathing. 17) A rubber bush or grommet should be used where a cable passes through a) Holes in metalwork b) A plaster board ceiling c) A timber floor joist d) An insulated roof space. 18) A hole is to be drilled in a joist to pass a cable through it. The minimum distance from the top of the joist to the top of the hole, to guard against damage by nailing into the cable, should be a) 40 mm b) 50 mm c) 60 mm d) 70 mm. 19) When terminal connections are made with a twin pvc insulated and sheathed cable, the copper earth conductor should be a) Left bare as the earth conductor b) Sleeved with black pvc sleeve c) Sleeved with red pvc sleeve d) Sleeved with yellow / green pvc sleeve. 20) Which one of the following wires should be connected to the thermostat when making the connection to an immersion heater? a) Live. b) Neutral. c) Earth. d) Live and earth. 21) The connection shown is a a) Claw washer b) Strip connection c) Pillar terminal d) Screw head. 22) The purpose of the fitting shown is to a) Connect two or more electrical cables b) Sound an alarm if smoke is detected c) Connect a light bulb fitment at ceiling level d) Connect all controls for a large CH system. 23) Which one of the following tests would be conducted to ensure that phased conductors are not crossed? a) Polarity. b) Insulation resistance. c) Safe isolation. d) Earth continuity. 24) When working on any existing electrical system, the first action to be carried out should be a) An earth continuity test b) Safe isolation of the system c) A polarity test on the circuit d) An insulation resistance reading. 25) The item of testing equipment shown is a) An earth continuity tester b) An ohmmeter c) A voltage indicating device d) A multi-meter. 26) The residual current device (RCD) protecting an electric shower in a dwelling will usually be rated at a) 16 mA b) 30 mA c) 75 mA d) 100 mA. 27) The decommissioning of a redundant electric immersion heater sited, in a cupboard off the hallway, has been completed within an occupied domestic dwelling. On completion the plumber should advise the a) Customer b) Local Authority c) Power supply company d) NICEIC inspector. 28) The most important safety precaution to observe when working on a central heating control system, is to ensure that the supply is a) Safely isolated at the boiler thermostat b) Disconnected before the consumer unit c) Safely isolated at the consumer unit d) Disconnected before the meter. 29) The item of equipment shown would most likely be used a) As a quick method of connecting a live cable to an appliance to check if it is working following repair work b) For connecting between the live and neutral on the ring main when carrying out a circuit polarity test c) As temporary earth continuity bonding whilst removing a section of metal pipe work d) For temporarily bridging the supply prior to the consumer unit and an appliance when the mcb has tripped. 30) The minimum size of cable required for Temporary continuity bonding is a) 4 mm² b) 6 mm² c) 8 mm² d) 10 mm².

202 Electrical Principles 2

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