Fault Diagnosis and Rectification Paper 2

When initially discussing the work involved in fault finding with the client, an area of consideration should be?

• access arrangements

• availability of parts required

• total cost

• materials required

A fault has been reported on an unfamiliar machine. Which information would be of most use in fault finding?

• The Electrical Installation Certificate

• Maintenance records

• The workers using the equipment when it went wrong

• The manufacturers instructions

When preparing to work on a three-phase pillar drill, the number of tests required to prove isolation has been correctly completed is?

• 3

• 9

• 10

• 12

Which of the following information is not required when diagnosing a fault on a circuit that has no previous certificates in place?

• The existing Electrical Installation Certificate

• Events leading up to the fault

• Maintenance records

• The manufacturers instructions

A component has been identified as the cause of the fault but is not a stock item and requires ordering. What information should be given to the client?

• The supplier’s phone number to chase delivery

• The expected delivery/repair date

• The part number of the item ordered

• The way to bypass the faulty part, although safety will be impaired

An upgraded piece of equipment has been installed but repeatedly after 25 minutes of running, it trips out the circuit breaker. What is the most likely fault?

• A short circuit

• An overload

• An undervoltage

• A fault to earth

A customer has had new USB sockets fitted in the kitchen but can now hear a crackling noise. What is the most likely cause?

• An insulation resistance fault between neutral and earth

• An overvoltage outside the specification of the socket installed

• A loose connection

• Overloading the socket

An area in a factory has been subjected to a flood and you are working with two other colleagues to replace damaged equipment. To ensure the supply is safely isolated, which of the following should you do?

• Isolate the supply and keep the key yourself, as you are the senior electrician on site

• Isolate the supply and put the key somewhere you can all access it in case any of you need to re-energise the supply

• Fit a lock with multiple keys so you can all re-energise the supply

• Fit a multi-lock adaptor and all fit individual locks and retain your own keys

After diagnosing a fault as a damaged length of cable between two socket outlets, a new length of cable is installed. What documentation should be completed?

• A minor works certificate

• An Electrical Installation Certificate

• A condition report

• A schedule of test results

An RCD is tripping out. What is the cause of the fault?

• A fault to earth

• A short circuit between line and neutral

• An overload of the circuit

• Undervoltage