ICIT: Electrical Power Systems Quiz

What is the principle of operation of a generator?

• Conversion of light energy into electrical energy

• Conversion of sound energy into electrical energy

• Conversion of mechanical energy into electrical energy

• Conversion of heat energy into electrical energy

Answer explanation

The principle of operation of a generator involves the conversion of mechanical energy into electrical energy.

What is the main function of the rotor in an alternator or AC generator?

• To convert mechanical energy into electrical energy

• To house the windings

• To step-down the voltage

• To produce the magnetic field

Answer explanation

The main function of the rotor in an alternator or AC generator is to produce the magnetic field.

Which type of power station uses fuel such as oil, natural gas, or coal to heat water into steam to rotate turbines and generate electricity?

• Wind Power Station

• Thermal Power Station

• Atomic Power Station

• Hydro-Electric Power Station

Answer explanation

A Thermal Power Station uses fuel like oil, natural gas, or coal to heat water into steam, which rotates turbines to generate electricity.

What is the purpose of a condenser in a thermal power station?

• To convert steam energy into electrical energy

• To condense steam back into water

• To remove solid particles from the burning fuel

• To rotate the turbines

Answer explanation

The purpose of a condenser in a thermal power station is to condense steam back into water.

What is the advantage of an underground electrical power transmission system?

• Cheaper maintenance cost

• Easier repair in case of lightning strikes

• Higher efficiency in energy conversion

• Does not spoil the landscape with unsightly poles

Answer explanation

The advantage of an underground electrical power transmission system is that it does not spoil the landscape with unsightly poles.

What is the purpose of a distribution system in electrical power supply?

• To store excess electricity

• To step-up the voltage

• To generate electricity

• To convey power from a power station to consumers

Answer explanation

To convey power from a power station to consumers

What is the voltage range for a 3-phase, 4-wire supply system in Singapore?

• 400 V, 50 Hz

• 300 V, 50 Hz

• 200 V, 50 Hz

• 230 V, 50 Hz

Answer explanation

The correct voltage range for a 3-phase, 4-wire supply system in Singapore is 400 V, 50 Hz.

What is the purpose of a rising main distribution system in a multi-storey building?

• To connect various floors to the main switchboard

• To reduce the currents on the supply side

• To evenly distribute load currents

• To provide a backup power supply

Answer explanation

The purpose of a rising main distribution system in a multi-storey building is to connect various floors to the main switchboard.

What is the permitted voltage variation for a 3-phase 400 V supply according to Electricity Regulations?

• ± 10%

• ± 6%

• ± 20%

• ± 15%

Answer explanation

The permitted voltage variation for a 3-phase 400 V supply according to Electricity Regulations is ± 6%, making the correct answer choice ± 6%.

What is the function of a feeder in a distribution system?

• To connect one substation to another substation

• To distribute electricity to consumers

• To remove solid particles from the electricity

• To step-down the voltage

Answer explanation

The function of a feeder in a distribution system is to connect one substation to another substation.