Electrical revision

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