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Worksheetslevel 2 electrical mock paper 2
Total questions: 60
Worksheet time: 30mins
What is an organisational responsibility with regards to PPE?
Must be worn at all times.
Any defects must be reported.
Training and information on its use must be provided
Must be used in accordance with any training provided.
What regulation does the symbol, in Figure 1, apply to?
WEEE.
EAWR.
Control of Noise Regulations
The Pollution Prevention and Control Act.
What document sets out a systematic approach for a set task?
Permit to work
Method statement.
Risk assessment.
Job sheet.
What is the immediate action that must be taken upon discovering a colleague being exposed to an electric shock?
Pull the casualty away
Call for medical assistance.
Switch off the main supply.
Assess the situation.
Which personnel is concerned with the design and physical integrity of buildings and other large structures?
Site Manager
Safety Officer
Structural Engineer.
Site Supervisor
What job role entails checking the quality of materials and installation meets the client’s requirements?
Clerk of Works
Project Manager.
Contracts Manager.
Quantity Surveyor
What value is required to determine circuit power where only the circuit resistance is known?
I2
Zs
E
L
What value represents 1 MΩ?
1 x 10–6 Ω
1 x 10–3 Ω
1 x 103 Ω
1 x 106 Ω
According to Ohms Law, which is the correct formula?
R = V x I
R=V2+1
R = I / V
R = V / I
What is the sum of all the angles in a right angle triangle?
60.
90.
180.
360.
What is the value of angle A shown in Figure 2?
30.96
36.87
50.31
53.13
What part of the atom is negatively charged?
Proton.
Nucleus.
Electron.
Neutron.
What material is used as an insulator?
Tungsten.
Porcelain.
Mercury.
Carbon.
Which insulator is Hydroscopic?
Mica.
Bakelite.
Polyvinyl chloride.
Magnesium oxide.
How much power is dissipated by a 25 Ω resistor when 4 A flows through it?
0.4 W
40 W
0.4 kW
40 kW
What calculation would be used to calculate total resistance in a series circuit?
R1+R2+R3
R11+R21+R31
R11×R21×R31
R1×R2×R3
What is the length of a 2.5 mm2 copper conductor having a resistance of 0.207 Ω at 20 °C? The resistivity of copper is 0.0172 µΩ/m.
20 m
30 m
40 m
50 m
Three resistors of 12 Ω, 6 Ω and 4 Ω are connected in parallel. What is the total circuit resistance?
0.5 Ω
2 Ω
22 Ω
288 Ω
What is the total current for the circuit in Figure 3?
3.83 A
1.51 A
0.66 A
0.25 A
What two values does a wattmeter measure?
Voltage and resistance
Capacitance and resistance
Voltage and current.
Current and capacitance.
What is the unit of measure for magnetic flux?
Weber.
Henrys.
Kelvin.
Hertz.
What is the flux density when a conductor of effective length 0.25 m is moving at right angles through a magnetic field at a velocity of 5 m/s and is generating 1.375 V?
1.1 T
2.1 T
3.375 T
6.625 T
What is the output voltage of a transformer that is rated at 150 kVA and delivers 375 A at full load?
56 kV
525 V
400 V
225 V
How many primary turns will a 200 kVA, 3.3 kV/240 V 50 Hz single-phase transformer have, when there are 80 turns on the secondary winding?
1100 turns
833 turns.
60 turns.
3 turns.
What is Fleming’s formula for calculating force?
F = B + I + L
F=I−LB
F=I×LB
F = B × I × L
What is the unit of measurement for inductance?
Ohms.
Henrys.
Farads.
Siemens.
What is the operating principle of a double-wound transformer?
Self-induction.
Shared-induction.
Mutual induction
Opposed induction
What is the RMS voltage of a sine wave having a peak value of 90 V?
127.3 V
102.69 V
78.89 V
63.63 V
What passive component is used to reduce current in an electronic circuit?
Resistor
Thyristor
Transistor
Amplifier.
What must be performed before using the equipment shown in Figure 4, on site?
Earth leakage test.
GS 38 checks.
User checks.
Earth bond test.
What is the minimum distance required, from the top of a floor joist, for a hole used to pass cables through?
50 mm
60 mm
70 mm
80 mm
What is the most suitable cable for a fire alarm sounder installation?
Cat 5.
Fibre optic
Cat 6.
MIMS.
What is the item shown in Figure 5 used for?
Drawing in.
Dressing in.
Filling in.
Forming in.
What type of conduit set is shown in Figure 6?
Double set.
Bubble set.
180 bend.
Kick.
What type of cable would be supported by the item shown in Figure 7?
PVC SWA.
MICC.
SY Flex
Twin and cpc.
What is the minimum height that cables must be installed at, on a catenary system above a walkway?
2.5 m
3 m
3.5 m
4 m
What External Influence within BS 7671 would affect the selection of a containment system?
Capacity.
Utilisation.
Suitability.
Affordability.
What support system would be most suitable for running a large SWA up a building electrical riser?
Trunking.
Basket.
Ladder.
Conduit.
What factor will affect the minimum permissible csa of a cable?
Cost.
Load.
Aesthetics.
Practicality.
What is the nominal voltage (AC) indicated by a red BS EN 60309 socket?
400 V
230 V
110 V
50 V
What termination method is used to connect a conductor to a large busbar system?
Solder.
Crimp.
Welded.
Brazed.
What is a transmission voltage?
11 kV
25 kV
33 kV
400 kV
Who is responsible for the electrical meter in a domestic installation?
The owner
The electrician.
The energy supplier
The occupant.
What device provides Additional Protection against electric shock?
RCD
MCB.
BS 88 Fuse
BS 3036 Fuse.
Which supply system uses a Protective Earth and Neutral conductor?
TT
TN-S
IT
TN-C-S
Which supply system would have a RA value?
TT
TN-S
TN-C
TN-C-S
Which protective device requires a rating factor of 0.725?
BS 88-3
BS 3036
BS 1362
BS 88-2
Which of the following is a Protective Measure against faults as given in BS 7671?
ADS.
Barriers.
RCD.
Insulation.
Which of the following must be Earthed?
Metallic service pipe.
Metallic luminaire.
Steel air ducting.
Structural steel.
What is the purpose of Basic Protection?
To protect cables.
To protect equipment.
To prevent electric shock
To prevent damage to installation
Why are Earthing conductors installed?
To connect together exposed and extraneous conductive parts
To provide a link between all extraneous conductive parts.
To achieve basic protection.
To achieve fault protection.
What accessible parts would require a Protective Bonding Conductor connection?
Steel structural beams
Metallic conduit system.
Steel trunking system.
Metallic cable tray.
A circuit supplying a 13 A load is wired using a cable having a stated voltage drop of 11 mV/A/m and a length of 32 m. What would be the voltage drop for this circuit?
0.45 V
3.52 V
4.58 V
9.15 V
What does Part M of the Building Regulations give guidance on?
Heights of socket-outlets
Fire compartments in buildings.
Energy efficiency of lighting circuits
Depths of cables chases in walls.
What type of drawing is commonly used to show the positioning of electrical equipment?
Circuit.
Layout.
Wiring.
Schematic.
Why is compartmental trunking utilised within this installation?
To keep different coloured cables apart.
To separate Band I and Band II circuits.
To separate cables to reduce eddy currents.
To keep lighting and power circuits apart.
When a ladder is only anchored at ground level, what is the required minimum length to enable the inspection of the solar photovoltaic panels?
6.2 m
7.2 m
8.2 m
9.2 m
Which part of the RCBO operates under overload conditions?
Residual current trip
Electro-magnetic trip
Chemical trip.
Thermal trip.
What is the Zs. value for circuit 5, shown in Table 1, if the installation conditions result in the conductors operating at their maximum operating temperature?
0.39 Ω
0.68 Ω
0.74 Ω
0.82 Ω
Why does BS 7671 recommend neutrals to be installed at light switches?
To facilitate electronic switching devices
To ensure short circuits are avoided.
To enable lights to be fully isolated.
To provide emergency lighting test facilities
