Rock wool slabs can be used for a period of ____________________
Fill in the blank(s) with correct word
2 years.
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A meter set to read ohms and connected to light bulb terminals reads "OL". This reading means the bulb is _______
A) Bad B) Is reading what it should (good) C) Bulb filament is electrically open D) Both A and C
Radiant floor heating systems typically operate at temperatures of
A) 280°F to 300°F B) 200°F to 250°F C) 85°F to 140°F D) 180°F to 200°F
Why are time-delay fuses or HVACR-rated circuit breakers used?
A) They are required to meet current electrical codes. B) They are cheaper than standard fuses and circuit breakers. C) They are easier to install than standard fuses and circuit breakers. D) They are used to prevent nuisance tripping when the compressor starts.
A wye three-phase power supply provides:
A) 24 V between the legs. B) 240 V between the legs. C) 208 V between the legs. D) 120 V between the legs.