When the mercury bulb-type float switch changes position, ____.
a. the mercury contacts multiply
b. the mercury bulb-type float switch is no longer usable
c. the pump begins operation
d. the state of the contacts in the mercury switch are changed
d. the state of the contacts in the mercury switch are changed
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The ____________________ is used in water circuits and is a quick-shutoff valve? as it only needs to be turned one-quarter turn from on to off, like a ball valve.
Fill in the blank(s) with the appropriate word(s).
The temperature of the water formed by melting ice is:
A) 33°F. B) 32°F. C) 31°F. D) Ambient temperature.
Add the following numbers to obtain the correct sum.17 + 42 + 51 + 42 + 464 + 1,353 + 409 =
What will be an ideal response?
A motor enclosure that minimizes the entrance of rain and airborne particles to the electrical parts is considered
_____. a. drip-proof b. dust-proof c. sealed d. weather-protected