Children's Health | Electrical System Troubleshooting 301

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Question 1 of 8

1. Question
Which of the following steps should be the first course of action when working on a faulty transformer?
- Check the incoming voltage and amperage.
- Check the voltage at the supply breaker.
- Check the outgoing voltage and amperage.
- Check the temperature of the windings with a thermal thermometer.
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Question 2 of 8

2. Question
Normal power is restored after a brief power outage. What would cause a generator to continue to run after is has cooled down?
- automatic transfer switch (ATS) breaker failure
- generator engine malfunction
- active generator alarm panel (hasn’t been silenced/reset)
- load bank testing failure
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Question 3 of 8

3. Question
Which of the following troubleshooting procedures should be followed when determining a short in a motor winding?
- (1) disconnect all the leads, (2) Meg the motor to ground, and (3) if the reading is 0.00 between either the positive or negative motor lead to ground, then the motor has shorted
- (1) disconnect power, (2) Meg the motor across the positive and negative terminals, and (3) if the reading is 0.00, then the motor is shorted
- (1) disconnect all the leads, (2) Meg the motor to ground, and (3) if the reading is ∞ between either the positive or negative motor lead to ground, then the motor has shorted
- (1) disconnect power, (2) Meg the motor across the positive and negative terminals, and (3) if the reading is ∞, then the motor is shorted
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Question 4 of 8

4. Question
The patient wing air handler fan motor is tripping the overcurrent protection device (OCPD). The amperage measurement is higher than normal and the motor is overheating. Which of the following is most likely causing this problem?
- failed motor bearings
- shunt winding is open
- motor winding is grounded
- motor winding is open
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Question 5 of 8

5. Question
Which of the following will result in a variable frequency drive (VFD) becoming overheated?
- failed variable frequency drive (VFD) cooling fan
- failed variable frequency drive (VFD) control board
- overloaded motor
- ground fault
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Question 6 of 8

6. Question
Which of the following will cause a contactor to hum or chatter?
- voltage drop at the coil when closing
- high room temperature is detected
- contacts are welded together
- contact pigtail connection is open
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Question 7 of 8

7. Question
Which of the following would cause a single phase induction motor with a capacitor start to continue running after power is disconnected?
- winding is grounded
- rotor problems
- capacitor is defective
- armature winding is shorted
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Question 8 of 8

8. Question
Which of the following would cause a compressor motor to draw excessive current?
- one of three phases is not available
- line conductors too large
- capacitor is defective
- start winding is open
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Children’s Health | Electrical System Troubleshooting 301

Children’s Health | Electrical System Troubleshooting 301

Children’s Health | Electrical System Troubleshooting 301

Assessment Summary

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