WorksheetsFault finding Mock exam!
Total questions: 30
Worksheet time: 3600secs
What is the most appropriate method to protect against electric shock when carrying out fault diagnosis work?
A. Comply with COSHH.
B. Comply with the WEEE regulations.
C. Comply with the EaWR 1989.
D. Comply with ESQCR 2002.
Why would a method statement be used by an experienced operative before undertaking work on an installation to diagnose a fault?
A. To reduce the cost implications of the work to be undertaken.
B. Ensure effective billing of the work procedure or process.
C. Ensure Health and Safety requirements are considered.
D. To monitor customer satisfaction for trade reviews.
Which standard must test leads comply with in order to help avoid electric shock when undertaking fault finding and diagnosis work?
A. GN3
B. BS 7671
C. GS38
D. BS 3036
Which document should be completed when replacing an existing faulty fan isolator switch?
A. An Electrical Installation Certificate.
B. A Condition Report Inspection Schedule.
C. An Electrical Installation Condition Report.
D. A Minor Electrical Installation Works Certificate
Who would an operative need to keep informed of serious faults found on the lighting circuits in a fully functioning commercial unit?
A. Manufacturers of the test instruments.
B. Specialist equipment manufacturers.
C. The Health and Safety Executive.
D. The clients or their representative.
A client has reported that a number of space heaters have stopped working following extensive use during a cold spell. Which of the following items would be the most likely to be checked during testing for fault diagnosis purposes?
A. Prospective short circuit current.
B. External earth fault loop impedance.
C. Phase sequencing and insulation resistance.
D. Circuit supply voltage and protective device status.
What is the most likely outcome following a small leakage between neutral and earth due to water ingress in the connections of a luminaire?
A. High earth fault currents causing the main DNO fuse to operate.
B. Phase sequencing becoming reversed causing machinery faults.
C. High short circuit currents causing circuit fuses to operate.
D. Residual current flow to earth causing the operation of an RCD.
What is the most likely reason for the sound of arcing within a contactor, controlling heaters, each time the load is on and running?
A. A loose connection.
B. A transient overvoltage.
C. A low resistance joint.
D. A dead short in the circuit.
Where is a short circuit in a cable most likely to be located?
A. Where the containment has mechanical damage.
B. An over tightened termination in an accessory.
C. At the joint on the top of the circuit breaker.
D. Where ambient temperature decreases
What fault would an experienced operative suspect if the final socket-outlet on a radial circuit was not operating but the rest of the outlets on the circuit were?
A. Open circuit at the origin of the circuit.
B. Short circuit at the origin of the circuit.
C. Open circuit at the final socket-outlet on the circuit.
D. Short circuit at the final socket-outlet on the circuit.
What is the most likely reason for 15 A re-wireable fuse, protecting a radial socket outlet circuit that is reported to ‘blow every so often’?
A. Transient overvoltage
B. Open circuit in the line.
C. Occasional overloading.
D. Poor metering at the intake.
What precautions would an inspector need to consider when undertaking fault diagnosis work to stairway lighting, in an occupied multi-storey building that has back up supplies?
A. Ensure that the emergency lights are functioning correctly.
B. Ensure the risk assessments are completed and followed.
C. Ensure the standby generators are connected to the DNO supply.
D. Ensure that all access equipment is non-metallic and tagged as ‘safe’.
Which one of the following is the most likely test that will cause damage to sensitive equipment when testing to identify faults within an installation?
A. A continuity of protective conductors test.
B. An earth fault loop impedance test.
C. A prospective fault current test.
D. An Insulation resistance test.
What is the main risk when an operative undertakes live fault diagnosis work on an old piece of equipment containing electronic components?
A. Noxious fumes.
B. Electric shock.
C. That RCD testing may not be suitable.
D. That continuity testing may cause damage.
Why is it important to have a logical sequence in respect of the stages of fault diagnosis and correction?
A. To ensure compliance with the EaWR 1989.
B. To avoid inconvenience to other contractors.
C. To ensure compliance with BS 7671.
D. To avoid wasting time and effort.
At what minimum voltage must an operative consider the use of GS 38 test leads?
A. Between 4 V and 24 V DC.
B. < 50 V AC and > 120 V DC.
C. High voltage only.
D. > 50 V AC and > 120 V DC.
Which one of the following instruments is most appropriate when verifying the isolation of a three-phase AC supply to a motor?
A. A clamp meter.
B. A phase rotation tester.
C. A loop / PSC tester compliant to GS 38.
D. An approved voltage indicator to GS 38
What is the correct unit that would be displayed on an RCD tester when confirming compliance with additional protection?
A. mA
B. I∆N
C. ms
D. mΩ
What is the most appropriate method of finding the location of an open circuit in the cpc of a radial socketoutlet circuit supplying a number outlets?
A. Using a prospective earth fault test at the end of the circuit.
B. Using an earth fault loop impedance tester at the origin.
C. Using a continuity tester at the mid-point of the circuit.
D. Using an insulation resistance tester on the supply to the circuit.
What type of circuit would have a minimum acceptable insulation resistance value of 0.5 MΩ between live conductors?
A. PELV.
B. FELV.
C. Reduced-Low voltage.
D. Low voltage.
What would be the approximate voltage drop on a 35 m long radial circuit that has a combined live conductor resistance of 0.54 Ω at 20 °C, and a load current of 16 A?
A. 35.54 V
B. 18.91 V
C. 10.36 V
D. 4.64 V
What is the most significant factor to consider when needing to replace a DOL starter switch on an old lathe in a small workshop?
A. Ability to test the old parts.
B. Accessibility of old test data.
C. Provision of temporary supplies.
D. Availability of replacement parts.
What is the most significant factor when deciding upon whether to replace or repair a faulty component on a production line in a meat packing factory with a 24 hour, 7 day week shift pattern during the fault finding process?
A. Supply earthing arrangements.
B. Access to welfare facilities.
C. Packing staff availability.
D. Loss of production.
Which one of the following is the main consideration when carrying out major fault diagnosis work in the freezer section in a supermarket?
A. Emergency lighting and access equipment.
B. The cost of the replacement equipment.
C. Suitable high visibility and warm clothing.
D. Temporary power supplies for the freezers.
What is the main consideration after fault diagnosis and rectification work has been undertaken in a small 10 year old commercial installation?
A. The designer has signed the original certificate.
B. Access to and size of the installation.
C. All diagnosis is undertaken out of hours.
D. All repairs are correctly certificated.
What testing must the home owner be encouraged to undertake every 6 months, following the rectification of a fault on an RCD protecting a socket-outlet rated at 13 A for outdoor use?
A. Earth fault loop impedance.
B. Insulation resistance.
C. Electrical separation.
D. Functional tests.
What test result would an experienced operative be looking for, when verifying continuity, following the successful replacement of a short main protective bonding conductor to metallic gas pipe within an installation due to damage?
A. < 1 kΩ but > 1000 Ω
B. > 1 kΩ but < 1 MΩ
C. < 1 kΩ but > 1 Ω
D. > 10 mΩ but < 1 Ω
Which test instrument setting would be used to test an RCD for Additional Protection?
A. 0.5 x I∆N
B. 1 x I∆N
C. 2 X I∆N
D. 5 x I∆N
What is the correct symbol to verify on a data plate when checking to see if a new three-phase piece of equipment is compatible for supply voltage before it is installed?
A. MV
B. mV
C. U0
D. U
Which one of the following regulations must be considered when disposing of compact fluorescent lamps?
A. RiDDOR.
B. COSHH. .
C. WEEE.
D. EaWR
