Electrical Engineering Quiz

A tap changer has the ability to alter

• The outgoing voltage

• The incoming voltage

• The outgoing current

• The incoming current

What is the primary function of a surge arrester in a power system?

• To protect the system from over-voltage

• To stabilize the frequency

• To decrease the current flow

• To increase the voltage level

What do you mean by 3 x 1c 300Al XLPE 11KV in a single line diagram?

• 3 times 1 centimetre 300 amps line, unearthed cable

• 3 core plus 1 core 300 amps lead sheathed 11KV cable

• 3 core 300 mm square copper sheathed 11KV cable

• 3 single core 300 mm square aluminium sheathed 11000V cable

What you mean by ‘phasing out’ term in jointing cables would be?

• A system to ensure safe isolation

• The replacement of old colour markings with new ones

• The location of high resistance joints

• A method of ensuring correct phase rotation

Cable spiking is used for

• Ensuring a cable is dead at the point of work

• Prove a cable is live and still in service

• Ensure no current surges are present

• Ensure no voltage surges are present

An expansion joint is used in some types of high voltage underground cable to counteract the effect of

• Excessive oil pressure

• Load surges

• Increased loading

• Subsidence

Which conductor would most likely be used for transmission overhead lines?

• AAAC

• ABC

• Copper

• AAC

Which of the following materials is typically used for the insulation of high-voltage cables?

• Polyethylene

• Wood

• Rubber

• Glass

The instrument used for synchronisation would be.

• Earth impedance tester

• Insulation resistance tester

• Multi-meter

• Test-lamp

Main reason for earthing a neutral point on a low voltage 4 wire system?

• Voltage stabilisation

• Overcurrent protection

• Limits currents at houses

• Prevents electrocution