Transmission and Distribution of Electricity

2-pin plugs are not connected to the earth wire.

• TRUE

• FALSE

Choose the step-up transformer

• A

• B

• C

Which of the following wire returns electric current to the branch substation?

• Neutral wire

• Live wire

• Earth wire

Which of the following cuts off the electricity in the house when excessive current flows through it?

• ELCB circuit breaker

• MCB circuit breaker

• Main switch

• Electric meter

What is the colour of earth wire?

• Brown

• Red

• Yellow and green stripes

• Blue

The main supply of electrical energy in a house has a voltage of

• 33 kV

• 415 V

• 240 V

• 11 kV

Which of the following fuse cannot be replaced when melted?

• Replaceable fuse

• Irreplaceable fuse

• Cartridge fuse

Name the component labelled D

• Power station

• National Grid Network

• Switch zone

• Step-down transformer

What is the function of live wire?

• To carry electrical current from electrical appliance to substation

• To carry leaked current to the ground

• To carry electrical current from station to electrical appliance

What is the name of the wire in blue colour that labelled by number 2?

• Live wire

• Neutral wire

• Earth wire