When designing a piping system, select a circulator that delivers up to ____ more head than required at the desired flow rate.
a. 5%
b. 10%
c. 25%
d. 50%
b. 10%
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By the end of the 1700s, what was the percentage of people living in rural areas of colonial America?
A. 25 percent B. 40 percent C. 60 percent D. 75 percent E. 90 percent
The crankcase pressure regulating valve is _____.
a. used in systems with multiple evaporators that operate at different temperatures to control the evaporator temperatures b. used to control the maximum pressure at the compressor suction line in order to protect the compressor motor from overload c. used to control system capacity in addition to limiting evaporator temperature d. adjusted for the minimum pressure specified by the manufacturer
A growler is used to test what starter component?
A) Solenoid B) Armature C) Commutator D) Field coils
The function of a thermocouple in a gas valve is to _____
a. ignite the fuel when the gas valve opens b. turn the pilot off when the thermostat is satisfied c. convert heat from the pilot into an electric current d. sense the flame of the main burner