Air Conditioning Certification Exam
Questions With Verified Solutions.
A faulty condenser fan motor on an air conditioning system will cause these symptoms..... - Answer
High suction pressure and high discharge pressure
When connecting copper to steel the recommended brazing filler alloy is a... - Answer 45 percent silver
alloy
A partially iced over evaporator can be caused by... - Answer An undercharge
Heat added to the refrigerant in vapor state after the evaporation process is called.... - Answer
Superheat
Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - Answer
Prevent liquid slugging of the compressor
Heat which causes a change of temperature of substance is called.... - Answer Sensible heat
The thermostatic expansion valve has three operating pressures.... - Answer Evaporator pressure,
spring pressure, and sensor bulb pressure
What is the maximum operating pressure setting for an acetylene torch? - Answer 15 psig
Heat added to a substance without a rise in temperature; (example: liquid refrigerant to gas) this process
is called? - Answer Latent heat of vaporization
An automatic expansion valve is best suited.... - Answer When the load remains fairly constant
, If the cut-off plate is removed from a blower assembly, how would this effect blower performance? -
Answer It would reduce air flow
When using an electronic leak detector, the sensor probe.... - Answer Should be moved approximately
1 inch every two seconds
A thermostatic expansion valve is designed to maintain... - Answer Constant evaporator superheat
A refrigerant gives up heat when... - Answer It condenses
10 lbs of refrigerant passing through a water cooled condenser will lose 20 Btu's of heat per lb. If 10 lb of
water passes through the condenser with an entering temperature of 80 degrees F. The temperature of
the water leaving the condenser is..... - Answer 100 degrees F
Which of the following symptoms would be indicative of an oil logged condenser? - Answer High
discharge line pressure and low liquid line pressure
A compressor that has a broken valve will cause these symptoms.... - Answer High suction pressure and
low discharge pressure
The state of the refrigerant in the suction line should be... - Answer Low pressure / low temperature
vapor
The heat removed from the refrigerant by the condenser is.... - Answer Both sensible and latent heat
The first function of a condenser must perform is to __________ the refrigerant before condensing can
occur. - Answer De-superheat
A dirty evaporator in an air conditioning system will cause these symptoms... - Answer Low suction
pressure and low discharge pressure
Questions With Verified Solutions.
A faulty condenser fan motor on an air conditioning system will cause these symptoms..... - Answer
High suction pressure and high discharge pressure
When connecting copper to steel the recommended brazing filler alloy is a... - Answer 45 percent silver
alloy
A partially iced over evaporator can be caused by... - Answer An undercharge
Heat added to the refrigerant in vapor state after the evaporation process is called.... - Answer
Superheat
Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - Answer
Prevent liquid slugging of the compressor
Heat which causes a change of temperature of substance is called.... - Answer Sensible heat
The thermostatic expansion valve has three operating pressures.... - Answer Evaporator pressure,
spring pressure, and sensor bulb pressure
What is the maximum operating pressure setting for an acetylene torch? - Answer 15 psig
Heat added to a substance without a rise in temperature; (example: liquid refrigerant to gas) this process
is called? - Answer Latent heat of vaporization
An automatic expansion valve is best suited.... - Answer When the load remains fairly constant
, If the cut-off plate is removed from a blower assembly, how would this effect blower performance? -
Answer It would reduce air flow
When using an electronic leak detector, the sensor probe.... - Answer Should be moved approximately
1 inch every two seconds
A thermostatic expansion valve is designed to maintain... - Answer Constant evaporator superheat
A refrigerant gives up heat when... - Answer It condenses
10 lbs of refrigerant passing through a water cooled condenser will lose 20 Btu's of heat per lb. If 10 lb of
water passes through the condenser with an entering temperature of 80 degrees F. The temperature of
the water leaving the condenser is..... - Answer 100 degrees F
Which of the following symptoms would be indicative of an oil logged condenser? - Answer High
discharge line pressure and low liquid line pressure
A compressor that has a broken valve will cause these symptoms.... - Answer High suction pressure and
low discharge pressure
The state of the refrigerant in the suction line should be... - Answer Low pressure / low temperature
vapor
The heat removed from the refrigerant by the condenser is.... - Answer Both sensible and latent heat
The first function of a condenser must perform is to __________ the refrigerant before condensing can
occur. - Answer De-superheat
A dirty evaporator in an air conditioning system will cause these symptoms... - Answer Low suction
pressure and low discharge pressure
