Fault Diagnosis and Rectification Paper 1

What dangers are associated with electricity when undertaking fault diagnosis?

• Fire and freezing

• Arcing and freezing

• Trips, slips and falls

• Electric shock and burns

What safety standard applies to test instruments used for fault finding?

• BSEN 60898

• BSEN 61010

• BSEN 61009

• BSEN 61008

During fault diagnosis, you discover extensive melted insulation on a cable.  What should you do before replacing the damaged cable?

• Report the potential danger to your supervisor

• Carry out a continuity test

• Carry out an EFLI test

• Carry out an insulation test

Which two safety methods should be used to protect members of the public when carrying out live tests during fault diagnosis?

• Safe isolation and GS38 test leads

• Barriers and warning notices

• Barriers and GS38 test leads

• GS38 test leads and warning notices

Which document is necessary for unfamiliar electrical equipment and what information will be found in this document that would be useful for fault diagnosis?

• Maintenance schedule / Power supplies

• Permit to work / Isolation requirements

• IET Wiring Regulations 17th Edition / Location of isolators

• Manufacturers instruction manual / Troubleshooting guide

What additional problems may a customer experience due to fault diagnosis work?

• Increased efficiency of equipment

• Removal of faulty equipment

• Temporary loss of other circuits for safety

• Installation of replacement equipment

When arriving at a large industrial installation to carry out fault diagnosis, who should to speak to first about the work to be completed?

• Factory Health & Safety officer

• The manager of the area you are going to work in

• The machine operator who reported the fault

• Company secretary

What could likely happen where there is voltage drop on a machine control circuit?

• Machine operation is unaffected

• Machine runs slower

• Machine output runs in start / stop motion

• The circuit automatically switches off

What is a dangerous consequence of a bearing failure in an electric motor?

• Motor runs at a lower speed

• Motor becomes noisy in operation

• Excessive speed at the output shaft

• Excessive heat leading to fire

What is the most probable cause of a loose connection on a large industrial machine and what is the most likely consequence of this loose connection?

• Wear and tear / Machine runs slower

• Poor workmanship / Increased power usage

• Vibration / Arcing at the terminal

• Incorrect fasteners / Machine runs slower