IDA-101 End of unit 14

Front

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

Back

Checking the power supply

Front

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

Back

windings, bearings, and centrifugal switch

Front

Electric motor windings fail in which of the following conditions? open, shorted, grounded, all of the choices are correct

Back

all of the choices are correct

Front

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

Back

current draw, noise, and seized

Front

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

Back

True

Front

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

Back

contacts, coil, and mechanical.

Front

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

Back

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

Front

What is the major cause of contact misalignment? Options: coil failure, pitted contacts, faulty mechanical linkage, faulty wiring connections

Back

faulty mechanical linkage

Front

If the coil of a relay is shorted, the resistance reading will be $0$ ohms.

Back

0

Front

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

Back

infinite