Section 250.4(A) explains that electrical systems are grounded to limit the voltage imposed by lightning, line surges, or unintentional contact with higher-voltage lines and to ________ the voltage to earth during normal operation.
a. alter
b. stop
c. stabilize
d. permit
c. stabilize
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With direct-acting solenoid valves, the port size of the valve is limited by _____.
a. the power limitations of the coil b. the refrigerant type c. the operating pressure d. the ambient temperature
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What type of furnace draft uses two fans to facilitate airflow?
A. Assisted draft B. Induced draft C. Natural draft D. Balanced draft
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Which tool is best to measure valve lift?
A) Micrometer B) Caliper C) Dial indicator D) Any of these
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The purpose of the cooling tower by-pass valve is to ____.
A. route debris away from the tower sump B. prevent cavitation at the pump C. provide makeup water to the tower sump D. help maintain the correct water temperature to the condenser in mild weather
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