Fault Finding Quiz

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

• access arrangement

• availability of parts required

• total cost

• materials required

Answer explanation

When initially discussing the work involved in fault finding with the client, an area of consideration should be the access arrangement, as it is crucial for reaching the faulty components efficiently.

A fault has been reported on a bottling 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 manufacturer's instructions

Answer explanation

The manufacturer's instructions would be most useful in fault finding as they provide specific guidance on how the machine should operate and how to troubleshoot issues.

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

Answer explanation

To prove isolation on a three-phase pillar drill, 10 tests are required to ensure correct completion of isolation procedures.

Which of the following information is not required when diagnosing a fault?

• The Electrical Installation Certificate

• Events leading up to the fault

• Maintenance records

• The manufacturer's instructions

Answer explanation

The Electrical Installation Certificate is not required when diagnosing a fault as it pertains to the installation process, not the fault itself.

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

Answer explanation

The expected delivery/repair date should be given to the client when a non-stock item needs to be ordered for repair.

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

Answer explanation

The most likely fault is an overload, causing the circuit breaker to trip after 25 minutes of running.

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

Answer explanation

A loose connection is the most likely cause of the crackling noise after new USB sockets are fitted in the kitchen.

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

Answer explanation

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

Answer explanation

An Electrical Installation Certificate should be completed after installing a new length of cable to document the work done.

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

Answer explanation

The cause of the fault in the RCD tripping out is a fault to earth, which leads to the protection device detecting the fault and disconnecting the circuit.