What is the impedance (Z) of a coil with 84 ohms resistance (R) and 500 ohms reactance (X)? Round the answer to the nearer ohm.
Fill in the blank(s) with the appropriate word(s).
507
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Answer the following statement(s) true (T) or false (F)
1.Overhead service conductors are permitted to be attached to trees for support. 2.Outdoor light fixtures are permitted to be attached to trees. 3.A metal underground water pipe in contact with the earth for 10 feet or more is permitted to be the only grounding electrode needed to meet NEC® requirements. 4.The enclosure housing a temporary service entrance disconnecting means must be dust-tight. 5.If a single grounding electrode that is a rod, pipe, or plate does not have resistance to earth of 25 ohms or less, an additional electrode must be installed.
The operation of a thermostatic expansion valve can best be described as:
A) Spring pressure = bulb pressure + evaporator pressure. B) Bulb pressure = evaporator pressure + spring pressure. C) Bulb pressure = evaporator pressure = spring pressure. D) Evaporator pressure = evaporator pressure + bulb pressure.
A load study that treats the whole house as one big room is called:
A) A unified load calculation. B) A multiroom load calculation. C) A shell load calculation. D) A monolithic load calculation.
The diagram displayed on an OW that includes equipment and flow is a(n) _____
A) alarm graphic B) process graphic C) control graphic D) discrete graphic