Motor Protection Quiz

What is the main purpose of motor protection systems?

• To prevent electrical faults
• To enhance motor speed
• To minimise fire risk and motor damage
• To reduce motor noise

Which device needs to be replaced after it breaks due to high current?

• Circuit breaker
• Thermal relay
• Fuse
• Motor temperature sensor

Which device can be reset and does not need replacement after tripping?

• Fuse
• Circuit breaker
• Motor temperature sensor
• Thermal relay

Which device uses thermistors to detect high temperatures in motors?

• Circuit breaker
• Fuse
• Thermal relay
• Motor temperature sensor

What is the function of a contactor in motor protection systems?

• To disconnect the load directly
• To sense temperature
• To turn the motor on and off
• To melt and break under high current

How can thermal circuit breakers be reset?

• By replacing them
• By turning the switch from 'tripped' to 'on'
• By pressing a 'reset' button only
• Both automatically and manually

Which motor protection device contains load current sensors and a switch?

• Fuse
• Circuit breaker
• Motor temperature sensor
• Thermal relay

What describes failsafe operation in motor protection systems?

• The system remains operational, even if there is a partial failure
• If there is any sort of failure within the system, it shuts down
• The system is safe because it is resistant to failure
• The system is safe because it is prone to failure