WorksheetsElectrical Level 3
Total questions: 34
Worksheet time: 26mins
What type of system do most domestic properties use?
Live
3 phase
Single phase
Live & Neutral
What building regulations cover electrical work?
Part P
Part G
Part L
Part M
What is the component in the image?
RCD
MCB
Cartridge Fuse
RCBO
What size are the tails connected to the electric meter?
15mm
10mm
25mm
35mm
Resistance is measured in....
Amps
Ohms
Volts
Hertz
An inverter changes current from DC to AC?
True
False
What do you use to ensure a circuit is isolated correctly?
Neon Screwdriver
Voltage Indicator
Wet Fingers
Ask a Supervisor
What is the CSA of equipotential bonding?
10mm
16mm
25mm
6mm
What type of bonding is this?
Cross Bonding
Temporary Bonding
Equipotential Bonding
Supplementary Bonding
Bonding all metal parts of a building, including all service pipework, best describes...
Cross Bonding
Temporary Bonding
Equipotential Bonding
Supplementary Bonding
A test that confirms the correct flow of electricity is called...
Continuity
Insulation Resistance
Earth Loop Impedance
Polarity
Is this plug wired correctly?
Yes
No
What size fuse protects central heating systems?
5 Amp
13 Amp
3 Amp
30 Amp
What is the maximum time a RCD must disconnect a 32 amp circuit if a fault is detected?
40 Milliseconds
60 Milliseconds
0.4 Milliseconds
0.6 Milliseconds
An RCD will operate at not more than.......mA
16 mAmp
50 mAmp
5 mAmp
32 mAmp
Cartridge fuses are governed by what BS number?
BS 7671
BS 6700
BS 1361
BS 442
What is the maximum measurement for the exposed tips of voltage detectors?
1mm
2mm
3mm
4mm
What must be done to test equipment, usually on an annual basis?
Checked for paint damage
Cleaned
Calibrated for Accuracy
Replaced
What do you use to ensure your test equipment is working correctly?
9V Battery
Proving Unit
Voltage Indicator
Multimeter
What is a likely cause of having no heating working on an S plan system?
TRV Fault
Zone Valve Failure
Radiator Blocked
Boiler Fault
What component generates electricity in a MCHP system?
Sterling Engine
Heat Exchanger
Burner
Inverter
What process recognises the presence of a flame on modern boilers?
Fire Switch
Air Pressure Switch
Thermocouple
Flame Rectification
What component is this?
APS
PCB
Fan
Diverter Valve
What component senses a pilot flame and uses a micro-current to hold open the main gas valve?
Flame Rectification
Burner
Thermocouple
DC Detector
What earthing system is this?
TN-C-S
TNS
TT
Equipotential
What is the unit of power for an appliance?
Amp
Joule
Volt
Watt
What is this symbol?
Class 1
Class 2
Class 3
Class 4
What current does a thermocouple create?
15 mV DC
20 mV DC
15 mV AC
20 mV AC
What is the name of the cable in the image?
Rated Hardened Cable
4 Core Rigid
4 Core Flex
SWA (Steel Wired Armoured)
A gas/water pipe can be used as a main earth?
True
False
What does the brown wire do on a two port zone valve?
Acts as Neutral
Turns The Stat On
Energises The Motor
Turn The Boiler On
The frequency of the alternating current in UK household electrical outlets is...
30 Hertz
50 Hertz
70 Hertz
90 Hertz
What size is the primary earth cable connected to the MET?
6mm
10mm
16mm
25mm
Where would you find a label that reads ' Test Quarterly, Press Button'?
MCB
RCD
Rewireable Fuse
Cartridge Fuse
