Name: 
 

Chapter 7



True/False
Indicate whether the sentence or statement is true or false.
 

 1. 

Electronic leak detectors can detect nitrogen when used to pressurize a refrigeration system.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 2. 

Which type of bearings do most residential fan motors use?
a.
ball
c.
sleeve
b.
reed
d.
nylon
 

 3. 

Which of the following is not a condition of the belt being too tight on a blower?
a.
bearing damage
c.
excessive noise
b.
belt slippage
d.
excessive belt breakage
 

 4. 

Which of the following is a condition of an air conditioning system that is overcharged?
a.
increased evaporator superheat
c.
low operating pressures
b.
reduced evaporator efficiency
d.
evaporator coil frosting
 

 5. 

Which type of leak detection involves burning refrigerant?
a.
halide
c.
soap bubbles
b.
electronic
d.
ultraviolet light
 

 6. 

When pressurizing a system to check for refrigerant leaks, which type of refrigerant should be used regardless of the system charge?
a.
R12
c.
R502
b.
R410a
d.
R22
 

 7. 

Which type of leak detection uses a refrigerant additive charged into the refrigeration system?
a.
halide
c.
electronic
b.
soap bubbles
d.
UV leak detection
 

 8. 

Which of the following could be the reason that the subcooling would be below 8 degrees on an air conditioning system?
a.
dirty or blocked condenser coil
b.
system operating in low ambient conditions
c.
refrigerant-flow restriction
d.
noncondensable gas in the system
 

 9. 

If, while troubleshooting a residential air conditioning system, the operating pressures are 40 psig low side and 116 psig high side, what would be the most likely problem?
a.
overcharge of refrigerant
d.
defective condenser fan motor
b.
dirty condenser
e.
normal operation
c.
refrigerant leak
 

Short Answer
 

 10. 

List four possible fan motor mechanical problems.
 



 
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