Fault Diagnosis and Rectification

Identify the action most appropriate to protect operatives from the risk of electric shock when carrying out fault diagnosis.
1. compliance with EaW regulations
2. compliance with COSHH regulations
3. compliance with PUWER regulations
4. compliance with Hasaw
Identify the purpose of a Method Statement when used during fault diagnosis activities.
1. to help reduce costs for the work done
2. to help ensure accurate invoicing for the work done
3. to help ensure health and safety requirements are followed
4. to help provide useful feedback to the customer
Identify the appropriate standard to which all test leads should comply to help reduce the risks of electric shock.
1. GN1
2. BS7671
3. GS38
4. BS61009
Identify the document to be completed following the replacement of a faulty socket outlet within an installation.
1. minor electrical installation works certificate
2. condition report
3. electrical installation certificate
4. schedule of test results form
A serious fault has been found on a lighting circuit during routine inspection work at a commercial premises. Who would need to be informed.
1. manufacturers of the lighting points
2. test instrument manufacturer
3. the client
4. the HSE
identify the most likely outcome should a leakage current flow between Neutral and cpc due to insulation failure.
1. operation of the RCD due to residual current flow
2. operation of the circuit MCB
3. operation of fuses within the circuit
4. mains supply failure
Identify the likely reason for an 'arcing' sound within an motor controller whenever the motor is turned on.
1. loose connection
2. transient voltage spikes
3. low resistance conductor connections
4. a short circuit in the conductors
Identify the most likely location for a 'short circuit' fault in a circuit cable.
1. where mechanical damage has happened to the containment system
2. where a conductor terminal has been overtightened
3. where a conductor termination has become loose
4. where the circuit runs through lower ambient temperature areas
Identify the most likely cause for a spur on a ring circuit to be not working when the rest of the ring is.
1. open circuit at the origin of the ring circuit
2. short-circuit at the origin of the ring circuit
3. open circuit at the last socket on the circuit
4. open circuit at the last socket on the circuit
Identify the most likely reason for the repeated 'blowing' of a 16A MCB protecting a Radial heating circuit.
1. voltage 'spikes' on the mains supply
2. Open circuit of the Line conductor
3. Occasional overloading
4. poor quality fuse
Identify the main precaution that an Inspector should consider when fault diagnosing on a complex lighting circuit in the stairwell of a multi-storey block of flats.
1. make sure EM lighting is left alone
2. make sure Risk Assessment is adhered to
3. ensure any back-up supplies are left connected
4. only undertake work when the occupants are out
Identify the test most likely to cause damage to sensitive electronic accessories, during testing after rectifying a fault.
1. continuity checks
2. polarity checks
3. insulation resistance checks
4. prospective fault current checks
Identify the main risk when fault-finding on old electronic equipment.
1. risk of fumes being given off
2. risk of electric shock
3. continuity test may give false readings
4. old equipment not starting up correctly
Identify the reason for having a 'logical approach' to faultfinding.
1. to ensure full compliance with EaW regulations
2. to avoid unnecessary time wastage
3. to avoid inconveniencing other workers on site
4. to ensure compliance with BS7671 regulations
Identify the voltage level that test leads need, to comply with GS38.
1. >50v AC and >120v DC
2. >110v AC and <1000v DC
3. 230v AC
4. between 4v DC and 50v DC
Identify the appropriate test instrument used to verify the isolation of a 3-phase supply.
1. approved voltage indication device to G38
2. earth fault loop impedance tester to GS38
3. phase rotation meter
4. current clamp meter
Identify the correct scale measure used by an RCD test instrument.
1. mS
2. mA
3. m OHM
4. m ohm
Identify the most appropriate method for finding a suspected open circuit conductor fault within a radial cooker circuit.
1. short-circuit current test
2. continuity test at mid-point in circuit
3. insulation resistance check at end of circuit
4. earth loop impedance check at origin of circuit
Identify the circuit voltage type having a minimum acceptable insulation resistance value of 0.5 M ohm.
1. 230v
2. 400v
3. ELV
4. low voltage
Identify a main factor to consider when replacing a DOL starter unit on an old item of machinery.
1. availability of replacement parts
2. available back-up power supply
3. availability of test equipment
4. available operator to test the machine
Identify a main factor to consider when deciding to repair OR replace a faulty component on a machine in a high-volume manufacturing process run over a 3-shift with 7-day production.
1. loss of production
2. available back-up power supply
3. availability of test equipment
4. available operators to test the machine after
Identify a main factor to consider when diagnosing a fault within the circuits of a 'cold-store' in a large supermarket.
1. temporary power supply for freezers
2. cost of replacement parts
3. suitable warm clothing
4. suitable access
Identify a main consideration after the fault diagnosis and rectification work has been completed on a 5 year old commercial building.
1. the designer for the building has signed the original installation certificates
2. access to the building
3. repairs are correctly documented
4. special certificate is required due to age of building
Identify the testing that a homeowner is encouraged to carry out quarterly, following the replacement of a faulty RCBO.
1. functional tests
2. earth fault loop impedance tests
3. insulation resistance tests
4. prospective fault current tests
Identify the expected test reading range for a continuity check on a recently replaced bonding conductor.
1. 10m Ohms - 0.05 Ohms
2. 1 Ohm - 2 Ohms
3. 20 Ohms - 1k Ohms
4. > 1 M Ohms
Identify the appropriate maximum disconnection time for a 30mA AC RCD (non time delay) used as 'additional protection'
1. 40mS
2. 200mS
3. 300mS
4. 500mS
On some equipment 'nameplates', identify the symbol used to denote the 'supply voltage' to equipment prior to installation.
1. U
2. Uo
3. kV
4. AC
Identify the regulations that deal with the safe disposal of faulty CFL (compact fluorescent lamps) at the end of their life.
1. COSHH
2. WEEE
3. HaSaW
4. PUWER
Identify the most appropriate method for helping locate a suspected short-circuit fault within an A1 RING socket circuit.
1. short-circuit current test
2. insulation resistance test at mid-point in circuit
3. insulation resistance check at end of circuit
4. earth loop impedance check at origin of circuit
Identify the test to be carried out to determine the correct rotation of a newly installed (replacement) 3-phase motor on an industrial machine.
1. Continuity test
2. Phase sequence test
3. Insulation Resistance test
4. Voltage test
Identify the correct scale of measure used by a continuity test instrument.
1. ohm
2. mA
3. M Ohm
4. A
Records of any repairs carried out on equipment in a commercial installation, become...
1. service history
2. installations reports
3. installation records
4. equipment nomenclature
During repairs, when would this strap be required to be worn by the electrician doing the repairs?
1. when repairing equipment containing sensitive semiconductors
2. when repairing small conductor terminations
3. when repairing industrial equipment
4. when repairing equipment containing passive electronic components

Fault Diagnosis and Rectification

Fault diagnosis and rectification 3 - 16 questions from a large bank of questions