Worksheets2382-22 Mini Mock Exam
Total questions: 30
Worksheet time: 3600secs
BS 7671 applies to
Equipment on Board Ships
Lightning protection of buildings
Lift installations covered by BS5655
Electric Vehicle Charging
BS 7671 provides requirements for safety against the risk of
Electric shock on an aircraft
Shock Currents on board Ships
Arc Fault Detection in HMO building
Fire on an off shore installation
Implementation of measures to assess an electrical installation by means of which its effectiveness is proved, including ascertaining values by appropriate measurement is known as;
Testing
Verification
Inspection
Reporting
Which one of the following is a characteristic that should be assessed when considering the compatibility of equipment to avoid harmful effects upon other electrical equipment?
Ingress Protection (IP)
The rating of the protective device at the origin
Harmonic Currents
The Design Current
Which one of the following does not comply when considering the connection of final circuits?
Each final circuit should be connected to a separate way in a distribution board
The wiring of each final circuit shall be electrically separate from every other final circuit
Where there are insufficient ways, circuits may be bunched to provide protection
Due account should be taken of the consequence of the operation of a protective device
Which of the following is not recognized as a source for safety services?
Solar Photovoltaic array
Primary Cells
Generator sets independent of the normal supply
Storage Batteries
Which protective measures are not generally permitted in each part of an installation?
Electrical separation for the supply of more than one item of current-using equipment
Automatic Disconnection of Supply (ADS)
Extra-Low Voltage (SELV and PELV)
double or reinforced insulation
1The maximum disconnection time for a TN-C-S, AC circuit supplying a three-phase sub-distribution board from a 63A fused-switch is
0.4s
1s
5s
0.2s
The maximum Zs value for TN-S, 400V AC circuit supplying a sub-distribution board, protected by a 63A BS88-2 fuse is
0.78Ω
0.68Ω
0.44Ω
0.36Ω
1A 32 A type C circuit-breaker is used to give a disconnection time of 5 seconds in a reduced low voltage system with a nominal voltage to Earth (Uo) of 63.5 V. What is the maximum value of earth fault loop impedance (Zs)?
0.33Ω
0.19Ω
0.16Ω
0.17Ω
When calculating the effects of fault current, a copper conductor insulated in 90˚C thermosetting material, has a k factor of
115
103
143
141
Which of the following is not a recognized source of electromagnetic disturbances?
Electric Motors
Fluorescent Lighting
Electrode Water Boilers
Transformers
A main switch intended for operation by ordinary persons, e.g., of a household, shall
Be capable of being locked in the ‘on’ position to avoid interruption to the supply
Be capable of breaking the full load current
Interrupt both live conductors of a single-phase supply
Provide separation of the line conductor of at least 5mm for isolation purposes
A BS EN 60309 plug and socket-outlet rated at 63A may be used for which purpose
Isolation
Emergency Switching
Functional Switching
Firefighters Switch
The selection of the means of connection need not take account of which one of the following
The material of the conductor and its insulation
The cross-sectional area of the conductor
The prospective design current to be carried
The number and shape of the wires forming the conductor
Where a power cable is in the proximity of or crosses an underground telecommunications cable, there should be a minimum clearance of;
50mm
75mm
100mm
300mm
Where an RCD provides for the protection against the risk of fire, it should have a rated residual operating current not exceeding
100mA
500mA
30mA
300mA
Where protection against the effects of direct lightning strokes to a supply system is provided by the application of surge protection devices utilizing the Lightning Protection Zone concept, Critical equipment is located in
LPZ 0
LPZ 1
Boundary of LPZ 1
LPZ 2
Where an autotransformer is connected to a circuit having a neutral conductor, the common terminal of the winding shall be connected to the
Neutral conductor
Line conductor
Protective conductor
Bonding conductor
When selecting wiring systems for safety-services, the cables that could be used in fire conditions may comply with
IEC 5266
BS 60439-3
BS EN 60898
IEC 60331-2
When carrying out an inspection of a new installation, it is not necessary to verify the
Total earth fault loop impedance for each circuit
Connection of conductors
Methods of protection against electric shock
Presence of diagrams, instructions and similar information
An insulation resistance test is to be carried out on a 3-phase 400 V circuit. The test voltage and minimum acceptable reading would be
250 V a.c.
0.5 MΩ
500 V d.c.
0.5 MΩ
500 V d.c.
1 MΩ
1000 V d.c.
0.5 Ω
In a swimming pool or other basin, the metallic covering or sheath of a wiring system in zones 0, 1 or 2 shall
not be used
not be earthed
be connected
to the supplementary bonding
have reinforced insulation.
Equipment on a pontoon in a marina that is subject to impact to level AG2 should have a mechanical protection code of
IPX4
IPX8
IP55
IK08
In caravans, each final circuit shall be protected against Over-current by a device that disconnects
all live conductors in that circuit
the line conductors only
line, neutral and protective conductors
the caravan and site supply system
Electric dodgems shall only be operated at voltages not exceeding
120Va.c. or 50Vd.c.
50 V a.c. or
120 V d.c.
110 V a.c. reduced low voltage
1000 V a.c. or 1500 V d.c.
The correct Rating factor for a 90ºC thermosetting cable operating at 35ºC ambient temperature is
0.91
0 .94
0.96
1.02
The image shows an example of:
An Isolated PEI
A Individual PEI
A Shared PEI
A Collective PEI
External influences coded BE are classified as
nature of processed or stored materials
conditions of evacuation in an emergency
movement of air
capability of persons
When completing an Electrical Installation Condition Report, any observations should be given a code. The code C2 is allocated to indicate
Conforms completely with the Regulations but is out of date.
Improvement recommended
Potentially dangerous-urgent remedial action required
Danger present. Risk of injury. Immediate remedial action required
