G063A Quiz No 8
Electrical Safety and Protection Quiz
Test your knowledge on electrical safety, motor operations, and protection devices with our comprehensive quiz. Brush up on important concepts in electrical engineering and become more informed about how to protect equipment and ensure safe practices.
Key topics covered include:
- Motor voltage characteristics
- Undervoltage protection
- Surge protection components
- Current ratings and circuit protection
If the voltage supply to an electric motor is lower than the rated voltage, which of the following are true:
The motor will draw excessive current
The motor speed will increase
The motor may overheat
The motor will slow and cool
Which of the following would protect against undervoltage?
Alternate supply
Undervoltage relay
Circuit breaker
Surge diverter
The essential component in a surge diverter is a:
Thermistor
Varistor
Thyristor
Transistor
A fault current limiter is:
Resistive component which limits the maximum circuit current
Reactive component designed to oppose current rise when a fault occurs
Circuit opening device to limit the let through energy when a fault occurs
Parallel capacitor which smooths large current fluctuations
An isolating switch installed to isolate a three-phase machine must interrupt:
All conductors
The neutral conductors
At least two phases of a three-phase supply
All active conductors
Answer the following question with reference to the fuse rupturing characteristic graph attached:
For a 63A HRC service fuseto disconnect the supply in 0.4 seconds, how much current is needed to flow through the fuse?
50 amps
150 amps
350 amps
400 amps
A domestic range is being upgraded from a 7.8kW unit to a 9.6kW unit. The cable is sufficient to carry the load but the circuit breaker size needs to be increased. What is an appropriate size breaker for this load?
16A
20A
25A (I=P/V) for three-phase
32A (I=P/V) for single-phase
What does "30mA" marked on a RCD/MCB represent?
Residual tripping current
Overload current
Nominal current
Fault current
What does "6kA" marked on a RCD/MCB represent?
Residual tripping current
Overload current
Nominal current
Fault current
What does "C10" marked on a RCD/MCB represent?
Type C 10A nominal current
Type C 10A fault current
Circuit breaker 10A
Current rating 10A
An over voltage transient in an electrical installation can be caused by:
Switching operations
High bay lights
High power factor loads
A low power factor
Select from the following. List two (2) causes of undervoltage:
Fault in supply system
Voltage drop due to overload
Being too close to the supply transformer
Lightning strike
Which of the following would protect against undervoltage?
Alternate supply
Undervoltage relay
Circuit breaker
Surge diverter
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