To prevent the system refrigerant from quickly dropping in temperature and pressure, refrigerant recovery should:
A) Always take place while the system is operating.
B) Begin with liquid.
C) Only be attempted in the summer.
D) Begin with vapor.
[Ques. 2] What are free electrons?
A) Electrons that flow without any energy input
B) Electrons that escape from conductors into the surrounding air
C) Electrons that are no longer bound to their atoms
D) Electricity that the power company does not charge for
[Ques. 3] In refrigeration and air conditioning, safety controls are wired:
A) In either series or parallel with the load they protect.
B) In series with the load they protect.
C) In parallel with the load they protect.
D) In parallel with the power supply.
[Ques. 4] Select the characteristics of a flake ice maker. You may select more than one.
A) Uses hot gas bypass to release ice from the evaporator
B) Continuous ice making and delivery
C) Alternating ice making and harvest cycles
D) Uses a slow-turning auger to crack off the ice
E) Large rectangular evaporator
F) Cylindrical evaporator
[Ques. 5] The condensate drain on a rooftop unit:
A) Does not require any type of drain line.
B) Is normally run through the curb to an inside drain connection.
C) Does not require a trap because of the short distance.
D) Must include a trap unless the unit has an integral trap.
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