ACR108-Unit 41 Practice Test (CRF) - Mr. Graham

When performing mechanical troubleshooting on an air-conditioning system, a technician should have _________.

• gauges and temperature-testing equipment

• an ohmmeter and a digital manometer

• a digital manometer and a megger

• an ohmmeter and megohmmeter

The difference in temperature between the refrigerant condensing temperature and the ambient air blowing over the condenser coil is called _______.

• subcooling

• superheat

• Delta T

• temperature split

During standard operating conditions, there will be approximately a ____°F wet-bulb drop from the evaporator inlet to the evaporator outlet.

• 20

• 5

• 10

• 15

The humidity in the air at the evaporator outlet will be at almost ____%.

• 90

• 50

• 70

• 80

For a system that utilizes a R-410A compressor, the discharge line may be as hot as ____°F under normal conditions. Care must be taken when attaching a thermometer.

• 150

• 200

• 250

• 175

Manufacturers report that a fairly high percentage of compressors returned to them under warranty are actually not defective but were reported by the technician as defective.

• True

• False

A standard efficiency system usually has a refrigerant boiling temperature of about ____ °F cooler than the entering-air temperature at standard operating conditions.

• 35
• 45

• 15

• 25

If a condenser is located under a deck, air may be circulated back through the condenser and cause ________.

On small systems, a technician should not connect a gauge manifold every time the system is serviced.

• True

• False

The gauge manifold displays low- and high-side pressures that can be converted to _________ temperatures using a T/P chart.

• vacuum

• ambient

• Celsius

• saturation