A digital storage oscilloscope is set to begin displaying a waveform when a certain voltage is detected. This minimum voltage is called _________

A) Threshold B) Trigger level C) Trip D) None of these


B

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A flange that is welded both inside and outside the pipe end is called a _____.

a. Van Stone flange b. weld-neck flange c. slip-on flange d. stubby flange

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Describe standard deviation.

What will be an ideal response?

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A high temperature rise across a furnace heat exchanger may cause _____

a. condensation in the vent b. higher flue gas temperatures c. carbon monoxide formation d. lower flue gas temperatures

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Why is outside air mixed with return air?

What will be an ideal response?

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