WorksheetsElectrical Supply Quiz
Total questions: 15
Worksheet time: 8mins
What are the two types of electrical current?
DC and DC
BC and AC
AC and DC
AC and AC
How is power generated in a power station?
By using solar panels
By using wind turbines
By using electromagnetism
By using batteries
How many degrees are there between phases in a three-phase supply?
360 degrees
180 degrees
120 degrees
90 degrees
Calculate the line current on a delta connected system when the phase current is 40A.
120A
69.28A
38.46A
40A
Calculate the line current on a star connected system when the phase current is 40A.
40A
80A
160A
120A
Calculate the phase voltage on a delta connected system when the line voltage is 400V.
400V
200V
230V
430V
What is the voltage supplied for domestic heating pump?
230V single phase
12V DC
400V three phase
24V, 50V or 110V DC
What is the typical voltage supply for LED lighting?
230V single phase
24V, 50V or 110V DC
400V three phase
12V DC
What is the typical voltage supply for air conditioning fan?
400V three phase
12V DC
230V single phase
24V, 50V or 110V DC
What is the typical voltage supply for hot water heater?
230V single phase
12V DC
24V, 50V or 110V DC
400V three phase
What is the typical voltage supply for fire exit signs & emergency lights?
24V, 50V or 110V DC
12V DC
230V single phase
400V three phase
What is a source of renewable power that requires the construction of large dams?
Geothermal power
Hydroelectric power
Solar power
Wind power
What is a disadvantage of solar power?
High set up cost
Tariffs are not set by the government
Solar cells have an infinite life
Works at night
What is a characteristic of hydroelectric power?
Is not renewable
Requires the construction of large dams
Generates electricity from sunlight
Requires the construction of wind turbines
What is the purpose of a rectifier in wind power generation?
To convert variable speed AC to DC which an inverter converts into stable AC
To convert DC to AC which an inverter converts into stable DC
To increase the generated voltage to the correct voltage for transmission
To store excess energy for transmission into the grid.
