Chapter 4, Electrical installations: Fault diagnosis and rectifi cation Video Solutions, Advanced Electrical Installation Work 2365 Edition. City and Guilds Edition

Problem 1

To diagnose and find electrical faults the ideal person will:
a. first isolate the whole system
b. use a logical and methodical approach
c. carry out the relevant tests recommended by Part 6 of the IET Regulations
d. recognize his own limitations and seek help and guidance where necessary.

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Problem 2

The 'symptoms' of an electrical fault might be:
a. there is a complete loss of power
b. nothing unusual is happening
c. there is a local or partial loss of power
d. the local isolator switch is locked off.

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Problem 3

A fault is not a natural occurrence, it is not planned and occurs unexpectedly. It may be caused by:
a. regular maintenance
b. negligence
c. misuse
d. abuse.

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Problem 4

The main lighting in a room having only one entrance would probably be controlled by a:
a. pull switch
b. intermediate switch
c. two-way switch
d. one-way switch.

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Problem 5

The main lighting in a room having two entrances would probably be controlled by a:
a. pull switch
b. intermediate switch
c. two-way switch
d. one-way switch.

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Problem 6

Electrical test equipment must always:
a. work on a.c. and d.c. supplies
b. have an in-date calibration certificate
c. incorporate a range selector switch
d. incorporate probes which comply with GS 38.

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Problem 7

A final circuit feeding socket outlets with a rated current of less than $20 \mathrm{~A}$ and used by ordinary persons for general use must always have:
a. overcurrent protection
b. $30 \mathrm{~mA}$ RCD protection
c. splash-proof protection
d. incorporate an industrial-type socket outlet.

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Problem 8

The IET Regulation test for 'continuity of conductors' tests:
a. line conductors
b. neutral conductors
c. CPCs
d. protective bonding conductors.

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Problem 9

The IET Regulation test for 'continuity of ring final circuit conductors' tests:
a. line conductors
b. neutral conductors
c. CPCs
d. protective bonding conductors.

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Problem 10

The IET Regulation test for 'insulation resistance' tests:
a. the effectiveness of conductors' insulation
b. the earth loop impedance
c. the earth conductors to the earth electrode
d. that protective devices are connected in the line conductor.

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Problem 11

The IET Regulation test for 'polarity' tests:
a. the earth loop impedance
b. the effective operation of RCDs
c. the effective operation of controls and switchgear
d. that protective devices are connected in the line conductor.

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Problem 12

The IET Regulation test for 'functional testing' tests:
a. the earth loop impedance
b. the effective operation of RCDs
c. the effective operation of controls and switchgear
d. that protective devices are connected in the line conductor.

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Problem 13

State three symptoms of an electrical fault.

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Problem 14

State three causes of electrical faults.

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04:19

Problem 15

Make a list of 10 places where faults might occur on an electrical system.

Vishal Gupta

Numerade Educator

Problem 16

List four steps involved in fault finding.

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Problem 17

State five requirements for safe working procedures when fault finding.

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03:29

Problem 18

State four factors that might influence the decision to either repair or replace faulty equipment.

Jennifer Stoner

Numerade Educator

Problem 19

State four safety features you would look for before selecting test equipment.

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02:14

Problem 20

State the advantages and dangers associated with optical fibre cables.

Ajay Singhal

Numerade Educator

07:33

Problem 21

State briefly the meaning of 'static electricity'. What action is taken to reduce the buildup of a static charge on an electrical system?

Artemisa Mazón

Numerade Educator

Problem 22

State the problems which an unexpected mains failure of IT equipment would create.

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Problem 23

Use a sketch to describe 'clean supplies', 'spikes' and 'noise' on IT supplies.

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Problem 24

Briefly describe what we mean by secure supplies and UPS with regard to IT equipment.

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00:26

Problem 25

Emergency supplies are often provided by storage batteries that are secondary cells. What is the advantage of a secondary cell in these circumstances?

David Collins

Numerade Educator

Problem 26

Use bullet points to list very briefly the requirements of testing and commissioning an installation following the repair of a fault.

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Problem 27

Use bullet points to list very briefly the six reasons for carrying out functional testing following the repair of a fault.

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Problem 28

The IET Regulation 612.13 advises us to check the effectiveness of four assemblies to show that they are properly mounted, adjusted and installed. Name them.

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Problem 29

State the reasons why it is important to make good any damage to the fabric of a building as a result of your electrical activities. State how you would make good damage to a brick wall and a concrete floor where a $100 \times 100 \mathrm{~mm}$ trunking passes through.

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Advanced Electrical Installation Work 2365 Edition. City and Guilds Edition

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Problem 2

Problem 3

Problem 4

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Problem 10

Problem 11

Problem 12

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