1. In a star connected three phase transformer the
* a) Three phases are connected together at the start point
* b) Three phases are separate
* c) Neutral conductor is connected to a single phase
* d) Neutral conductor is electrically separated
Answer - a
2. A single-phase double-wound transformer consists of
* a) A single core mounted winding
* b) A winding that carries the difference between IP and IS
* c) A single solid core
* d) Two electrically separated coils
Answer - d
3. One method of insulating windings is to use
* a) Shelac
* b) High reluctance silicon steel
* c) Low frequency dust cores
* d) PVC
Answer - a
4. The usual method of insulating core laminations is
* a) Low reluctance silicon steel
* b) Surface oxidization
* c) High frequency air cores
* d) Cellulose paper
Answer - b
5. If a motor is required to start against a large starting current, it is usual to use
* a) Direct on line starter
* b) Face plate starter
* c) Step down centre tapped starter
* d) Rotor resistance starter
Answer - d
6. In a shunt-wound motor the field coil is connected in
* a) Series with the armature
* b) Series with the motor
* c) parallel with the armature
* d) parallel with the motor
Answer - c
* a) Self- excited
* b) Polyphase
* c) Separately-excited
* d) Synchronous
Answer - c
* a) VL ÷ v3
* b) VL x v3
* c) VPhase ÷ v3
* d) VPhase x v3
Answer - a
9. Particular starting arrangements are used when a motor has a rating greater than
* a) 370 microwatts
* b) 0.37 watts
* c) 37 watts
* d) 370 watts
Answer - d
10. An isolator built into a panel is used for
* a) Normal load switching
* b) Fault load switching
* c) Short circuit protection
* d) No load switching
Answer - d
11. A device with a BS EN number has been
* a) Agreed for use only within the UK
* b) Agreed for operational use within the EU
* c) Standardized for all operational uses only in the UK
* d) Standardized for use in the EU
Answer - d
12. Q8 BS 7671 provides appropriate advice on
* a) Heights of panels
* b) Design of panels
* c) Environmental conditions
* d) Instrumentation
Answer - c
13. What degree of protection is specified for protection against a BS finger?
* a) IP4XB
* b) IP5XB
* c) IP6XB
* d) IPXXB
Answer - d
14. Which of the following is statutory?
* a) BS 7671
* b) On-Site Guide
* c) Electricity at Work Regulations
* d) GS 38
Answer - c
15. Which of the following are appropriate tests for a completed panel?
* a) Flash testing of components
* b) Insulation resistance and polarity
* c) Inspection of conductors for current carrying capacity
* d) Identification of conductors
Answer - b
16. The purpose of a switch is to open or close a circuit
* a) In the event of a fault current
* b) Under load conditions
* c) Under overload conditions
* d) Automatically after a fault has been repaired
Answer - b
17. A common type of cable termination used for ribbon cables in panel building is
* a) Pin
* b) Lug
* c) Insulation displacement
* d) Screw
Answer - c
18. A moving coil meter is not used on an ac circuit because
* a) It cannot read very small variations
* b) The direction of the deflection depends upon the direction of the current
* c) It is non linear
* d) It does not use the damping effect
Answer - b
19. To ensure safe isolation, voltage indicating devices
* a) Must comply with BS 7671
* b) Are used to prove the circuit dead only
* c) Are used to prove the circuit was alive only
* d) Must be “proved” prior to and “re-proved” after isolation
Answer - d
20. Which of the following is not a factor, which would affect the type of termination?
* a) Circuit design current
* b) Physical space around terminations
* c) Presence of solid foreign bodies
* d) Size of conductor
Answer - c
21. Which of the following has an adverse effect on installed equipment?
* a) Eddy current damping
* b) Air damping
* c) Ambient temperature
* d) Operating temperature
Answer - c
22. The purpose of a visual inspection is to ensure compliance with BS 7671, Section
* a) 601
* b) 712
* c) 413
* d) 314
Answer - b
23. The purpose of a method statement is to
* a) Ensure compliance with BS 7671
* b) Identify a safe working practice
* c) Provide a training document for staff
* d) Provide instructions to be followed at all times
Answer - b
24. Electrostatic sensitive equipment, in transit, need not be protected against damage from
* a) High temperature
* b) Dust and fibers
* c) Moisture ingress
* d) Day light
Answer - d
25. To facilitate ease of installation and assembly of equipment reference is made to
* a) BS 7430
* b) Manufacturer's catalogues
* c) GS 38
* d) Data charts
Answer - d
26. When a voltmeter is connected in a circuit it is essential that it
* a) Has a very low resistance
* b) Has a very high resistance
* c) Is connected in series with the supply
* d) Is connected in series with the load
Answer - b
27. When an ammeter is connected in a circuit it is essential that it
* a) Has a very low resistance
* b) Has a very high resistance
* c) Is connected across the supply
* d) Is connected across the load
Answer - a
28. Which of the following has an impact upon earthing?
* a) BS EN 60439-01
* b) BS 4491
* c) BS 4444
* d) BS EN 60898
Answer - c
29. Which of the following is a statutory piece of legislation?
* a) BS 7671
* b) IEE Guidance Notes
* c) Electricity at Work Regulations
* d) IEE On-Site Guide
Answer - c
30. Which of the following lamps would not normally form part of a highway electrical system?
* a) Low pressure mercury (T8-T12)
* b) Low pressure mercury (MBF)
* c) Metal halide (MBI)
* d) Incandescent Lamp (100W)
Answer - d
* a) BS 7671
* b) Guidance Notes 3
* c) On-Site Guide
* d) The Electricity at Work Regulations
Answer - d
32. To facilitate safe isolation, voltage indicating devices
* a) Must comply with BS 7671
* b) Are used to prove the circuit was dead only
* c) Are used to prove the circuit was alive only
* d) Are “proved” prior to and “re-proved” after isolation
Answer - d
33. Instruments should be regularly calibrated to
* a) Support local industry
* b) Ensure accuracy when testing
* c) Ensure operative is up to date
* d) Provide a training exercise for operatives
Answer - b
34. Relevant information for re commissioning street furniture can be found in
* a) IEE Guidance Notes 7
* b) Works instructions
* c) The Electricity Supply Regulations
* d) The Petroleum (Consolidation) Act 1928
Answer - b
35. Voltage indication devices need to be proved to ensure
* a) That the lamp has not gone
* b) That the highway furniture has been installed correctly
* c) Safe working conditions
* d) The correct operation of street furniture
Answer - c
