Describe the construction and operation of a vacuum circuit breaker.

What will be an ideal response?


The contacts of a vacuum circuit breaker are contained inside a sealed enclosure.   By removing the air inside the enclosure, ionization of air cannot take place and without ionization an arc cannot form.  Any arc that may form by a small amount of air that remains inside the enclosure is rapidly extinguished by the separation between the movable and stationary contact.  The contacts of a vacuum circuit breaker typically have a clearance of ½ to ¾ inch when open.

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Active direct systems use pumps and ____ sensors to circulate water from the collectors to the storage tank as needed.

A. wind B. solar C. water D. temperature

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What does the "O" thermostat terminal energize on most heat pumps?

A) The compressor contactor B) The indoor fan C) The electric heat strips D) The reversing valve

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Which one of these areas is the water jacket?

image
A) A
B) B
C) C
D) D

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A problem statement is developed because a need exists. The statement should:

A) be considered the blueprint for development. B) include every need. C) develop as the project begins to take shape. D) be specific and include all known obstacles.

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