ESCO AIR CONDITIONING FINAL EXAM
PAPER 2026 QUESTIONS AND VERIFIED
ANSWERS GUARANTEED PASS SCORE
⩥ 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
PAPER 2026 QUESTIONS AND VERIFIED
ANSWERS GUARANTEED PASS SCORE
⩥ 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
