Name: 
 

Chapter 6



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

 1. 

When the low side operating pressure on an R22 central air conditioning system is 57 psig, the evaporator coil can freeze.
 

 2. 

Most residential condensing units come pre-charged with refrigerant.
 

 3. 

Most residential evaporator coils come precharged with refrigerant.
 

 4. 

Blended refrigerants must be added to a refrigeration system in the vapor state.
 

 5. 

When measuring superheat on a residential air conditioning system, the suction line pipe temperature should always be lower than the suction line pressure converted to a temperature.
 

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

 6. 

In a perfect vacuum of 29.92, the micron gauge will read ____.
a.
25,400
c.
250
b.
500
d.
25
 

 7. 

When calculating high-side pressure on a standard-efficiency condensing unit, ____ degrees should be added to the ambient temperature and then converted to a pressure.
a.
30 to 35
c.
10 to 15
b.
20 to 25
d.
5 to 10
 

 8. 

When calculating high-side pressure on a high-efficiency condensing unit, ____ degrees should be added to the ambient temperature and then converted to a pressure.
a.
30 to 35
c.
10 to 15
b.
20 to 25
d.
5 to 10
 

 9. 

If the temperature difference between the return and supply air of a residential air conditioning system is lower than the acceptable range, refrigerant should be ____.
a.
added
b.
removed
 

 10. 

A sling psychrometer is used to measure which air condition?
a.
wet bulb temperature
c.
relative humidity
b.
dry bulb temperature
d.
all of the above
 



 
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