Question 1

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

Accepted Answer

A)   5-7
B)   8-10
C)   10-12
D)   12-15 C

Question 2

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

Accepted Answer

A)   108
B)   182
C)   243
D)   297 C

Question 3

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

Accepted Answer

A)   ohmmeter
B)   ammeter
C)   voltmeter
D)   milliammeter A

Question 4

Reducing the CFM through the evaporator will cause the head pressure to ____________________.

Accepted Answer

The answer of Reducing the CFM through the evaporator will...

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Why is the head pressure raised to 278 psig to check the subcooling of the system?

Accepted Answer

The answer of Why is the head pressure raised to...

Question 7

What is the process that normally begins the electrical troubleshooting of the system?

Accepted Answer

The answer of What is the process that normally begins...

Question 8

If a technician finds the circuit protection for an air-conditioning component has been tripped, what should the technician do?

Accepted Answer

The answer of If a technician finds the circuit protection...

Question 9

Two types of fixed-bore metering devices are capillary tubes and _________________________.

Accepted Answer

The answer of Two types of fixed-bore metering devices are...

Question 10

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

Accepted Answer

A)   75
B)   85
C)   95
D)   100

Question 11

Why do we measure temperatures at the evaporator rather than the suction pressure?

Accepted Answer

The answer of Why do we measure temperatures at the...

Question 12

Temperature difference is used to describe the difference in the inlet and _________ temperature of a heat exchanger.

Accepted Answer

The answer of Temperature difference is used to describe the...

Question 13

If a compressor has a partially shorted winding, it could run for a while, overheat, and shut off.

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A)   10-15° warmer
B)   10-15° cooler
C)   17-20° cooler
D)   17-20° warmer

Question 15

Where is the correct location for a sight glass in order to check the charge?

Accepted Answer

The answer of Where is the correct location for a...

Question 16

A service valve can be used to ____.

Accepted Answer

A)   check the electrical service to the compressor
B)   isolate the refrigerant so the system can be serviced
C)   check the air flow across the evaporator
D)   check the ambient temperature at the condenser

Question 17

Match between columns
                        Premises: non-condensable gas in system
refrigerant undercharge
improper system balancing
dirty condenser coil
defective condenser fan motor
defective evaporator fan motor
refrigerant overcharge
blocked/dirty filter

Accepted Answer

The Answer of low superheat and low operating pressures and is...

Question 18

When is it necessary to connect gauges onto a system?

Accepted Answer

The answer of When is it necessary to connect gauges...

Question 19

Why should a technician visually inspect the equipment before installing gauges?

Accepted Answer

The answer of Why should a technician visually inspect the...

Question 20

On most gauge manifolds, the suction or low side gauge is located on the ____________________.

Accepted Answer

The answer of On most gauge manifolds, the suction or...

Exam 41: Troubleshooting