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WorksheetsElectrical Scientific Principles and Technologies Quiz
Total questions: 10
Worksheet time: 5mins
How can water stored in a reservoir be used to produce electricity?
By using the water to create a magnetic field
By using the water to cool down electrical equipment
By using the water to directly generate electricity
By using the water to generate steam and turn a turbine
For the typical voltage values used in the United Kingdom, what is 400 kV used for?
Household appliances
Low voltage transmission
High voltage transmission
Industrial machinery
List three methods of generating electricity using renewable energy.
Tidal, Nuclear, Geothermal
Coal, Natural Gas, Oil
Solar, Wind, Biomass
Hydroelectric, Nuclear, Geothermal
Why is AC used in preference to DC for most electrical distribution in the UK?
AC is safer for electrical distribution
DC is safer for electrical distribution
DC is more efficient for long-distance transmission
AC is more efficient for long-distance transmission
List three types of AC motor controller.
Starter, Inverter, Regulator
Switch, Amplifier, Converter
Rectifier, Capacitor, Resistor
Relay, Diode, Transistor
Why do three-phase motor circuits not usually include a neutral conductor?
Because the three phases provide a balanced load
Because the neutral conductor is not necessary for motor circuits
Because the three phases provide an unbalanced load
Because the neutral conductor is only used for DC circuits
Protection against electric shock can be provided by?
Grounding, Overload protection, Short circuit protection
Insulation, Overvoltage protection, Surge protection
Voltage regulation, Current limiting, Power factor correction
Fusing, Earthing, Residual current device
Describe what happens to an RCD under a fault condition?
It regulates the voltage to prevent overloading
It shuts off the power if the voltage exceeds a certain limit
It disconnects the circuit if there is an imbalance in the current
It increases the current flow to stabilize the circuit
Determine the impedance of the circuit with a coil of inductance 0.2H and resistance 50Ω connected to a 230V 50Hz supply.
60.5 ohms
50.2 ohms
45.6 ohms
55.8 ohms
Determine the power factor for a 2kW load that draws 9 A from a 230 V supply.
0.86
0.90
0.82
0.78
