The most common refrigerant used in older room air conditioners is ____.
A. R-12
B. R-22
C. R-410A
D. R-500
Answer: B
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The thermal overload unit of the motor starter is located below the ____ contractor.
a. spring b. magnetic c. load d. overhead
A substance called _____ is absorbed by noninfected cells where it inhibits the growth of viruses
a. Penicillin c. Interferon b. Amoxicillin d. Antigen
Technician A says that the fuel system should be diagnosed first in a no-start condition. Technician B says that the ignition system trigger device is used to synchronize fuel injection. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
The pressure of a low-pressure chiller is raised for leak testing by:
A) Adding nitrogen to the chiller bundle. B) Circulating warm water through the chiller bundle. C) Adding refrigerant to the chiller bundle. D) Operating the chiller.