An imaginary cylinder that passes through the threads at a point where the width of the thread and the width of the groove are equal is the:
A. Pitch
B. Pitch diameter
C. Minor diameter
D. Major diameter
Answer: B
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Phenotypic variation exists within traits due to
A) Genotype B) Environment C) Both of the above
When a manual service valve is backseated:
A) The service port is open and the system is closed to the line. B) Both the service port and the line are open to the system. C) Both the service port and the line are closed to the system. D) The service port is closed and the system is open to the line.
Low-voltage thermostats normally operate on:
A) 24 V. B) 480 V. C) 120 V. D) 277 V.
An air-cooled condenser that is operating in a climate that has four distinct seasons must ____.
A. have some type of head pressure control B. use a water regulating valve C. have a multi-circuit evaporator D. operate with zero degrees of subcooling