Electrical Circuits and Systems Quiz

What is a radial circuit primarily used for?

• Lighting circuits
• Powering socket outlets
• Feeding high-power appliances
• Feeding a shower or cooker

What is the typical circuit protective device rating for a ring main?

• 10A
• 20A
• 30A
• 45A

Which of the following is a limitation of using ring mains?

• Higher installation cost
• Increased risk of overload
• Limited to one spur
• Requires more space

What is the maximum rating for modern electric showers mentioned in the presentation?

• 8kW
• 9kW
• 10kW
• 11kW

What type of cable is most suitable for immersion heater supplies?

• Standard PVC cable
• Heat-resistant flex
• Armoured cable
• Low-voltage cable

What is a spur in electrical circuits?

• A type of circuit breaker
• An outlet connected from an existing power circuit
• A type of lighting fixture
• A high-voltage supply line

What is the typical protective device rating for domestic lighting circuits?

• 5A
• 10A
• 15A
• 20A

Which type of motor requires a three-phase 400V supply?

• Single-phase motor
• Universal motor
• Three-phase motor
• Induction motor

What is the purpose of a contactor in a three-phase motor circuit?

• To regulate voltage
• To energize the motor
• To protect against overload
• To convert AC to DC

What is the main advantage of using a shaver socket in a bathroom?

• High power output
• Electrical isolation from earth
• Compact design
• Multiple outlets