1) What tool is used for removing the outer copper cladding (sheathing) from MI cable? a) stripping tool b) side-cutters c) stanley knife d) junior hacksaw 2) How are the cores of a MI cable 'usually' identified once the installation is complete? a) identification is not required b) the use of coloured sleeving c) use of number markers d) identification is not required 3) What is the main disadvantage when using MI cable? a) it is hygroscopic b) it requires special tools to work with c) its difficult to work with d) its expensive 4) why should cut edges of cable tray be 'made good' ? a) it helps maintain tray strength b) to minimise risk of damage to conductor insulation c) it makes fitting the cable tray together easier d) if makes to finished installation look better 5) which one of the following 'finishes' would require an additional coating to ensure protection against corrosion ? a) stainless steel b) PVC c) galvanising d) red oxide 6) why is cable tray NOT to be used as an 'earthing conductor' ? a) because electrical continuity cannot be guaranteed b) cable tray CAN be used as an earthing conductor c) because cable tray cannot conduct electricity d) because electrical insulation cannot be guaranteed 7) what type of tray may be used for carrying large power cables in a factory environment, due to its exceptionally high strength ? a) ladder rack b) uni-strut steelwork c) cable basket d) standard tray 8) why is it important to provide spacing behind cable tray fixed flat to a wall ? a) to help keep the tray straight b) to provide rigidity c) to make the tray easier to fit d) to allow cable-ties to be used 9) What colour is a neutral conductor in a single phase supply? a) brown b) blue c) black d) grey 10) What colour is a neutral in a three phase four wire suppy a) brown b) black c) grey d) blue 11) Which one of the following cable system is used for underground supply cables in older installations? a) PVC/PVC b) SWA c) XLPE d) Paper Insulated Lead Clad (PILC) 12) What is the internal insulating medium (material) in a M.I cable ? a) magnesium oxate b) magnesium oxide c) manganese oxide d) manganese dioxide 13) What is 'arctic' cable insulation ? a) 'special' white coloured cable b) 'special' PVC insulation able to operate/be handled at very low temperatures c) 'special' cable for hot environments d) 'special' extra-flexible cable 14) What is the main advantage of thermosetting materials in cable insulation? a) They are recyclable b) They soften at high temperatures c) They do not soften or melt d) They are cheaper than PVC 15) What does XLPE stand for? a) Extra Low Power Efficiency b) Cross-Linked Polyethylene c) X-ray Light Polymer Element d) Extended Line Power Equipment 16) Which of the following is NOT a limitation of thermosetting cables? a) Heavier than thermoplastic cables b) Cannot be recycled c) More flexible than thermoplastic cables d) Harder to strip for termination 17) What is the operating temperature of thermosetting cables? a) 90°C b) 160°C c) 200°C d) 250°C 18) What is a key requirement when connecting aluminium conductors to terminals? a) Use of copper lugs b) Use of zinc or cadmium plating c) Use of plastic insulation d) Use of silver solder 19) What is the purpose of the 'tug test' during termination inspection? a) To test the cable's flexibility b) To check if the conductor is loose c) To measure voltage d) To test insulation resistance 20) Which of the following is a thermoplastic material? a) XLPE b) Silicone rubber c) PVC d) EPDM 21) What is the main disadvantage of PVC cables in fire conditions? a) They are too flexible b) They release toxic fumes c) They are too expensive d) They are not flame retardant 22) What is the typical maximum operating temperature for PVC cables? a) 70°C b) 90°C c) 100°C d) 200°C 23) What is the main function of the steel wire armour in SWA cables? a) To increase flexibility b) To provide UV protection c) To provide mechanical protection d) To reduce cost 24) What is the main difference between SY and SWA cables? a) SY cables are waterproof b) SY cables use steel wire braid c) SWA cables are more flexible d) SY cables are used for underground installations 25) What is the main advantage of crimped terminations over soldered ones? a) They are cheaper b) They are easier to undo c) They are more vibration-resistant d) They require no tools 26) Which of the following is a non-screw compression connector? a) Choc block b) Wago 221 c) RJ45 d) Crimp lug 27) What is a common cause of high resistance joints? a) Proper torque application b) Use of copper conductors c) Loose or damaged connections d) Use of XLPE insulation 28) Compartment separators are used in trunking wiring systems to a) provide magnetic screening b) strengthen the trunking c) provide circuit segregation d) reduce thermal effects. 29) The purpose of the capacitor connected between the input terminals of fluorescent luminaires is to a) reduce interference with radios b) prevent surges affecting computers c) produce a high voltage at starting d) improve the power factor 30) Which one of the following is an exposed conductive part? a) A water pipe b) The casing of Class II equipment c) The metal framework of a building. d) The metal casing of a central heating pump 31) An effectively-earthed electrical installation gives protection against a) high voltage b) over-current c) electric shock d) mechanical damage 32) The minimum permitted cross-sectional area (CSA) of a supplementary bonding conductor having mechanical protection is a) 1.5 b) 2.5 c) 4.0 d) 6.0 33) In the formula Zs = Ze + (R1 + R2) the values of R1 and R2 refer to the resistance of the a) phase and neutral conductors b) phase and protective conductors c) neutral and protective conductors d) supply authority cables. 34) Where protection against overload is provided by a semi-enclosed (rewirable) fuse to BS 3036, the current rating of the cable must be at least a) 0.725 times the current rating of the fuse b) the nominal current rating of the fusedivided by 0.725 c) the same rating as the design current ofthe circuit d) 0.725 times the design current of the circuit.

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