The manufacturer's data on a split AC system indicates that the normal temperature drop should be 15F at the current operating conditions. If the evaporator entering air temperature is 80F and the leaving air temperature is 55F, the technician knows that the system:
A) Most likely is overcharged because it is cooling better than it is supposed to.
B) Is working great, even better than manufacturer's specifications.
C) Most likely has higher than normal airflow because of the higher-than-normal temperature drop.
D) Most likely has low air flow because of the higher-than-normal temperature drop.
[Ques. 2] The contactor on most residential split-system condensing units controls:
A) The compressor.
B) The compressor and the condenser fan motor.
C) The condenser fan motor.
D) The compressor, condenser fan motor, and evaporator fan motor.
[Ques. 3] How does a closed expansion tank work?
A) It uses a flexible diaphragm with an air charge above the diaphragm.
B) The walls of the tank are made of a flexible material.
C) The top of the tank is open to the atmosphere.
D) Air is trapped at the top of the tank.
[Ques. 4] How is the tubing used in ground-source systems joined?
A) Flare fittings B) CPVC cement C) Threaded fittings D) Thermal fusion
[Ques. 5] Why is low water a dangerous condition for a boiler?
A) A boiler that is low on water will have higher-than-normal internal mineral deposits.
B) A boiler that is low on water can cause excessive energy bills.
C) A boiler that is low on water can create steam pressure and explode as a result.
D) A boiler that is low on water can cause the burners to overheat.
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