What is the purpose of the zinc rod used in steel boilers?
A) It acts as a flame safety device
B) It prevents corrosion by reacting with corrosive elements before they attack the boiler
C) It acts as an electrical ground for safety purposes
D) It cycles the burner by sensing the water temperature
B
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Explain where datum shift is additive to a geometric tolerance and where it is not.
What will be an ideal response?
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867.6 - 269.8 = ?
A. ?597.8 B. ?602.2 C. ?608.8 D. ?692.2
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Any instrument with a digital readout will have ____________________.
Fill in the blank(s) with the appropriate word(s).
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Two 1.5 V cells rated at 60 mA are connected in series. The maximum current flow is
A) 0 mA B) 120 mA C) 30 mA D) 60 mA
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