IDA-101 End of unit 14

What is the first step in troubleshooting any system or component?

• Checking the power supply

• Rebooting the system

• Consulting the user manual

• Replacing the hardware

Open-type electric motors will fail in which of the following three areas?

• windings, bearings, and centrifugal switch

• windings, bearings, and contactor

• windings, centrifugal switch, and contactor

• centrifugal switch, contactor, and mobile module

Electric motor windings fail in which of the following conditions?

• open

• shorted

• grounded

• all of the choices are correct

How can bearing failure be determined in a hermetic compressor motor?

• current draw, noise, and seized

• vibration analysis, temperature rise, and oil leakage

• visual inspection, pressure drop, and overheating

• lubrication check, alignment issues, and unusual smells

True or False: The best way to check the contacts of a contactor is by visual inspection.

• True

• False

In troubleshooting contactors and relays, three areas must be checked: the __________, __________, and __________.

• contacts, coil, and mechanical.

• wiring, voltage, and resistance.

• temperature, humidity, and pressure.

• frequency, amplitude, and phase.

How do you make a voltage check to diagnose the condition of a set of contacts in a relay or contactor?

• By measuring the voltage across the contacts when the relay is energized

• By checking the resistance of the contacts

• By observing the physical condition of the contacts

• By measuring the current through the contacts

What is the major cause of contact misalignment?

• coil failure

• pitted contacts

• faulty mechanical linkage

• faulty wiring connections

If the coil of a relay is shorted, the resistance reading will be ohms.

• 0
• 500

• 10,000

• infinite

If the coil of a relay is open, the resistance reading will be ohms.

• 0

• 500

• 10,000

• infinite