Modern Refrigeration Chapters 17 thru 22

Front

A megohm reading of __ or higher indicates an excellent condition.

Back

100 MQ

Front

To ensure an electronically commutated motor (ECM) is communicating with the HVACR system, what should a technician check? Options: 120 V power circuit, fan blades, control circuit, pressure values.

Back

120 V power circuit

Front

To approximate a motor's internal temperature, a technician can add__ to the temperature of the motor frame as measured by an infrared thermometer.

Back

20°F

Front

What is the maximum temperature above the ambient temperature that the hottest part inside a motor should not exceed? Options: 6°F, 20°F, 44°F, 72°F, 403

Back

72°F

Front

Indications that a motor has excessive endplay include all of the following except: a distinct knocking sound, excessive vibration, excessive heat on the motor shaft, a high pitched squeal.

Back

a high pitched squeal

Front

The centerline of the shaft on a belt-driven fan or compressor must be perfectly __ with the centerline of the motor shaft.

Back

parallel

Front

A grooved wheel with two flanges used to change rotational direction or provide mechanical advantage is a__.

Back

pulley

Front

A cylindrical sleeve bearing, typically made of bronze, is called a__.

Back

bushing

Front

Which multimeter function allows a technician to test for an unbroken path between two points in a circuit? Options: Capacitance, Inductance, Continuity, Diode check

Back

Continuity

Front

The _ _ function on a multimeter allows a technician to test devices that conduct current in only one direction.

Back

diode check