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WorksheetsElectrical revision
Total questions: 20
Worksheet time: 10mins
What is the voltage for a circuit that has a resistance of 12Ω and a current of 4A?
3 V
12 V
36 V
48 V
What colour is the insulation around the conductor designated as the neutral?
Brown
Green
Blue
Yellow
What effect does a change in temperature have on the resistance of a conductor?
Resistance increases when temperature increases
Resistance decreases when temperature increases
Resistance is not affected by temperature change
Resistance only changes at absolute zero temperature
Which of the following is not a standard conductor cross-sectional area?
1.0mm²
2.5mm²
4.5mm²
6.0mm²
What for is a the total permitted percentage voltage drop for a power circuit in an electrical installation?
25%
3%
4%
5%
What is the total circuit current ( I ) for this circuit?
2 A
6 A
12 A
72 A
What is the purpose of basic protection in an electrical circuit?
It prevents faults from happening
It prevents contact with live parts
It decreases disconnection times
It increases disconnection times
Which earthing arrangement relies on the general mass of earth as the earth return path?
TT
TN-C
TN-S
TN-C-S
What is the BS number for a plug fuse?
BS 88
BS 3036
BS 1362
BS 4343
What does HSE guidance GS38 specifically cover?
Insulated screwdrivers
Test instruments and leads
Electrician's knives
The safe isolation process
What must always be done to ensure that a circuit breaker remains securely isolated?
Place a sign over the circuit breaker
Secure the circuit breaker with PVC tape
Use a locking device to keep the circuit breaker in the off position
Use a locking device to keep the circuit breaker in the on position
What is a short circuit fault?
A fault between line(live) and earth in a circuit
An overload caused by too much equipment
A broken conductor leaving a circuit open
A fault between line(live) and neutral in a circuit
Calculate the total circuit current (I) for this circuit.
3 amp
10 amp
30 amp
100 amp
What is the recommended device for checking the correct operation of an approved voltage indicating device?
Proving unit
Multimeter
Earth tester
Neon screwdriver
When isolating a circuit at the fussed spur switch, which of the following actions is considered the safest?
Covering the switch with insulating tape
Removing and placing the fuse below the switch
Removing and retaining the fuse in your pocket
Turning the switch off
What instrument should be used under the safe isolation procedure when checking for safe isolation?
RCD tester
insulation resistance tester
Multimeter
Approved voltage indicator
Which of the following type of tests would be carried out to ensure that in the event of an electrical fault through contact with metallic pipe, the current would flow to earth?
RCD test
Polarity test
Earth continuity test
Insulation resistance test
A radiator fitted near to a shower in a bathroom could require:
Supplementary bonding
Main bonding
Minor bonding
Additional bonding
A boiler, with a rating of 1150watt, 230v has been fitted with a 13 amp fuse. What is the correct procedure?
Leave it as it is
Change it for a 5 amp fuse
Fit a 32 amp MCB to protect it
Warn customer not to touch it
When should an approved voltage indicator be proven sufficient?
Before the job starts
Once all work is complete
Before and after a circuit is being switched off
Before and after testing for polarity
