Electrical Systems and Overcurrent Protection Quiz

What is the purpose of circuit protective devices?

• To increase the current flow in the circuit

• To reduce the voltage in the circuit

• To protect the units and the wires in the circuit

• To generate heat in the circuit

What are the three major categories of overcurrent?

• Overload, short-circuit, ground-fault

• Overcurrent, undercurrent, ground-fault

• Overvoltage, short-circuit, ground-fault

• Overload, underload, ground-fault

What is an overload overcurrent?

• A circuit protective device

• A short-circuit condition affecting only one of the circuit conductors

• A high-magnitude fault overcurrent

• A controlled overcurrent situation, normally of low magnitude

What is a short-circuit overcurrent?

• A controlled overcurrent situation, normally of low magnitude

• A circuit protective device

• A high-magnitude fault overcurrent

• A short-circuit condition affecting only one of the circuit conductors

What is a ground-fault overcurrent?

• A controlled overcurrent situation, normally of low magnitude

• A circuit protective device

• A high-magnitude fault overcurrent

• A short-circuit condition affecting only one of the circuit conductors

What is the function of a fuse in an electrical circuit?

• To increase the current flow in the circuit

• To monitor the current that passes through the circuit

• To reduce the voltage in the circuit

• To generate heat in the circuit

What is the most important rating of a fuse?

• Power rating

• Current rating

• Resistance rating

• Voltage rating

How does a thermal circuit breaker work?

• By developing a magnetic field

• By using a thermal bimetallic strip

• By cooling down before it can be reset

• By sensing temperature rise in the activator's element

What is the function of a distribution board in an electricity supply system?

• To divide an electrical power feed into subsidiary circuits

• To measure the amount of electric energy

• To increase the power feed into subsidiary circuits

• To reduce the power consumption

What is the purpose of an electric meter?

• To divide an electrical power feed into subsidiary circuits

• To measure the amount of electric energy by a consumer

• To control light, heat, or power circuits

• To reduce the power consumption