unit 41

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

• 10-15° warmer

• 10-15° cooler

• 17-20° cooler

• 17-20° warmer

A service valve can be used to ____.

• check the electrical service to the compressor

• isolate the refrigerant so the system can be serviced

• 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.

• 5-7

• 8-10

• 10-12

• 12-15

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

• 108

• 182

• 243

• 297

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

• superheat

• lowside pressure

• suction pressure

• subcooling

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

• 75

• 85

• 95

• 100

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

• ohmmeter

• ammeter

• voltmeter

• millimeter

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.

• true

• false