The SCR can control all of the positive waveform through the use of ____ shifting.

A. diode
B. phase
C. rectifier
D. gate


Answer: B

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Voltage ____ are series circuits in which the source voltage is divided among the resistors proportionally to their ohmic values.

a. subtractors b. multipliers c. additions d. dividers

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Reversing valves are used to change the ____ of refrigerant in a heat-pump system.

a. amount of flow b. temperature c. pressure d. direction of flow

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?Which letter represents a normal distribution?   

A. ?A B. ?B C. ?C D. ?D

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How do the various types of construction affect the cost of the plumbing work?

What will be an ideal response?

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