Motor Drive Protection Circuits
Authored by Andrew Harrison
Engineering
Professional Development
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8 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of relay can provide thermal protection for a motor?
Timer relay
Delay relay
Thermal relay
Pushbutton switch
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does an on-delay relay do when it is energised?
Switches immediately
Delays switching
Switches off
Remains unchanged
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which component is used for soft-starting a motor?
Pushbutton switch
Thermal relay
Delay relay
Fuse
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does the thermal protection relay connect to in the motor?
Contactor
Delay relay
Fuse
Thermistor
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the function of a star contactor in a motor control system?
To switch the motor off
To provide forward operation
To provide reverse operation
To enable soft-starting
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What happens to the switches of an off-delay relay when it is de-energised?
Switches immediately
Delays switching
Remains unchanged
Switches off
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In the control circuit, what arrangement prevents both forward and reverse contactors from being energised at the same time?
Latch
Interlock
Series
Parallel
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