____________________________ heat pumps utilize two coaxial heat exchangers, as compared to only one on the water-to-air configuration.
Fill in the blank(s) with the appropriate word(s).
Water to water
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Electricity can be generated electromagnetically for heavy power consumption only if the following are present: a magnetic field, a conductor, and the ____ motion of the two.
a. relative b. down c. centrifugal d. up
Sometimes called the ____, the portable electric circular saw is used by the carpenter more than any other portable power tool.
a.Skilsaw b.hacksaw c.ripsaw d.coping saw
Placing equipment directly on ceiling joists:
A) Is against code. B) Causes structural damage. C) Amplifies the equipment noise. D) Voids the warranty.
Answer the following statement(s) true (T) or false (F)
1. In order for an SCR to gain complete control of the waveform it must be phase shifted. 2. An SCR that has not been phase shifted can control all of the positive waveform. 3. An SCR that has not been phase shifted has the voltage, which is applied to the gate locked in phase with the voltage applied to the anode. 4. To obtain full control of the AC half cycle applied to the anode, the voltage applied to the gate must be in-phase with the voltage applied to the anode. 5. If the variable resistor is adjusted so that the gate current leads the voltage by a greater amount, the SCR fires later.