Unit 41

As a rule of thumb, the air leaving the evaporator will be about ____ than the air entering the evaporator.

• 17-20° cooler
• 10-15° warmer
• 10-15° cooler
• 17-20° warmer

A service valve can be used to ____.

• isolate the refrigerant so the system can be serviced
• check the electrical service to the compressor
• check the air flow across the evaporator
• check the ambient temperature at the condenser

A typical evaporator superheat reading at the evaporator outlet for a central air-conditioning system on a 95°F day would be ____°F.

• 10-12
• 8-10
• 5-7
• 12-15

On a 95°F day, the R-22 refrigerant pressure on the high side should be about ____ psig.

• 243
• 108
• 182
• 297

The liquid line temperature is used to determine the ____ of a condenser.

• subcooling
• superheat
• lowside pressure
• suction pressure

To accurately add refrigerant to a system, a condenser ambient temperature of ____°F should be simulated.

• 95
• 75
• 85
• 100

The instrument to use to check for a short in the compressor motor winding is a(n) ____.

• ohmmeter
• ammeter
• voltmeter
• milliammeter

With a rise in outdoor temperature, the head pressure will rise.

• True
• False

Superheat occurs in the condenser as well as the evaporator.

• True
• False

The best way to tell if a compressor's discharge line is at the correct temperature is to grab hold of it.

• False
• True