This is a mechanical device, often in the form of a helical coil, that yields by expansion or contraction due to pressure, force, or stress applied.
a. screw thread
b. retaining ring
c. key
d. spring
d. spring
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What is the normal frequency of AC power in the United States?
A) 90 cycles per second B) 60 cycles per second C) 25 cycles per second D) 50 cycles per second
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Push button type manual starters are ____________________, not fractional, horsepower starters.
Fill in the blank(s) with the appropriate word(s).
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In the ____________________ process, current is passed through a thin semiconductor material while a magnetic field passes through it.
Fill in the blank(s) with the appropriate word(s).
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Manufacturers recommend pressurizing VRF piping to ________ with nitrogen and performing a 24 hour standing leak test
A) 400 — 500 psig B) 200 — 300 psig C) 500 — 600 psig D) 300 — 400 psig
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