Unit 263 Transmission/Distribution Voltages Quiz

Why are higher transmission voltages needed?

• To transmit power over short distances

• To transmit small amounts of power

• To transmit power over long distances

• To transmit power without any economic reasons

What factors decide the voltage of transmission?

• Power to be transmitted and distance of transmission

• Power to be transmitted and type of power

• Distance of transmission and type of power

• Type of power and economic reasons

What is the main reason for higher transmission voltages?

• To transmit bulk power over a short distance

• To transmit small amounts of power over a long distance

• To transmit bulk power over a long distance

• To transmit power without any technical reasons

What happens to some of the energy when a current flows through a wire?

• It is completely used up.

• It is stored in the wire.

• It is wasted as heat.

• It is converted to light.

Why is more power lost when the current is higher?

• Because power is proportional to voltage.

• Because power is proportional to current squared.

• Because power is inversely proportional to resistance.

• Because power is inversely proportional to current.

How does the National Grid reduce energy losses during electricity transmission?

• By using thicker wires.

• By transmitting electricity at a high current.

• By transmitting electricity at a low current.

• By using more transformers.

What voltage is used for heavy industry according to the diagram?

• 11,000 volts

• 33,000 volts

• 132,000 volts

• 230 volts

At what voltage do power stations generate electricity?

• 25,000V

• 400,000V

• 275,000V

• 132,000V

Which of the following voltages is NOT used to transmit electricity through the National Grid cables?

• 400,000V

• 275,000V

• 132,000V

• 50,000V

Why do step-up transformers at power stations produce very high voltages?

• To increase the speed of electricity

• To improve efficiency by reducing heat loss in the power lines

• To decrease the cost of electricity

• To reduce the size of power lines