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MECHANICAL AND ELECTRICAL SYSTEMS EXAM 4 QUESTIONS AND ANSWERS | EXAM PREP & PRACTICE TEST 2026/2027

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MECHANICAL AND ELECTRICAL SYSTEMS EXAM 4 QUESTIONS AND ANSWERS | EXAM PREP & PRACTICE TEST 2026/2027

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MECHANICAL AND ELECTRICAL SYSTEMS EXAM 4 QUESTIONS AND ANSWERS | EXAM PREP &
PRACTICE TEST 2026/2027



meter location - ANS ✔✔homeowners can find the main shut off valve where



Building Supply

Water Meter

Building Main

Riser

Fixture Branch

Fixture Connection - ANS ✔✔which of these is not apart of the water supply system



an unsatisfactory connection or arrangement of piping that can cause nonpotable water to
enter the potable water system. - ANS ✔✔what is a cross connection



Building Supply

Water Meter

Building Main

Riser

Fixture Branch

Fixture Connection - ANS ✔✔what makes up a water supply system



the presence of excess calcium (Ca) and/or magnesium (Mg) mineral ions in water results in the
water being referred to as hard water.

soft water has a hardness of 3.5 gpg

hard water has a hardness of 7 gpg

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