Match the symptom with all possible causes. Note: The choices can be used more than once.
A. refrigerant overcharge
B. refrigerant undercharge
C. blocked/dirty filter
D. non-condensable gas in system
E. defective condenser fan motor
F. defective evaporator fan motor
G. improper system balancing
H. dirty condenser coil
I.
J.
K.
A. high operating pressures
B. low operating pressures
C. low operating pressures
D. high operating pressures
E. high operating pressures
F. low operating pressures
G. uneven cooling
H. high operating pressures
I. frozen evaporator coil
J. low superheat
K. high superheat
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The abbreviation for refrigerants containing chlorine, fluorine, and carbon is ____.
A. HFC B. HCFC C. CFC D. HFAC
Pure aluminum melts at ____ Fahrenheit.
A. 1200° B. 1500° C. 1800° D. 2200°
Smoke precipitators charge the smoke particles, which are then collected on ____ charged screens.
a. negatively b. oppositely c. positively d. similarly
How does a hot gas defrost system work?
A) Hot compressor discharge gas is routed to the evaporator. B) Gas flames provide the heat to melt the ice. C) A warm glycol solution is sprayed on the coil. D) The superheated gas leaving the evaporator is used to melt the ice.