Technician Asays the conventional theory of current flow states that current flows positive to negative. Technician B says current flows randomly. Who is correct?

A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B


Answer: A

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A molecular sieve desiccant dryer is used _____________________________

A. in a DDC system to keep the computer chips from developing static charges B. to control bacteria in cooling towers C. to remove moisture from compressed air used in pneumatic controls D. to remove CO? from boiler stack gas

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Which of the following would be true of current flow when a circuit is open?

A. high amperage and overheating B. low resistance and overheating C. current shorts directly to ground D. no current flow

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Polymer sealing elements may include: o-rings, "V" packs, loaded "U" rings, and rod wipers.

Answer the following statement true (T) or false (F)

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