The contacts in a potential relay are:

A) Either normally open or normally closed depending on the compressor.
B) Modulating type contacts.
C) Normally open.
D) Normally closed.


D

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____ is a gas that is produced by the ultraviolet radiation in the air in the vicinity of welding operations.

A. Argon B. Phosgene C. Ozone D. Carbon dioxide

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Before deciding to purchase or install an open-loop system, the ____________________ must be evaluated first.

Fill in the blank(s) with the appropriate word(s).

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Series-connected 20-pF and 60-pF capacitors are placed in parallel with series-connected 30-pF and 70-pF capacitors. Determine the equivalent capacitance.

What will be an ideal response?

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How should a thermostat be connected to a system that has two transformers: one in the furnace and one in the air conditioner?

A) Wire the furnace to RH and the air conditioner to RC. B) Tie the transformers together and leave off the R terminal. C) Wire both transformers to the R terminal. D) Wire the furnace to RC and the air conditioner to RH.

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