As shown in figure "A" of the illustration,...

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Question 1 of 205eccefa5bacbc34ba4d4887f

As shown in figure "A" of the illustration, assuming that the external manual "trimmer" is not fitted, what is the operational status of the comparator in terms of inputs and outputs? See illustration EL-0066.

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🔍 Key Concepts

• Comparator function in an automatic voltage regulator (AVR): it compares a sensed value with a reference set-point • Signal flow in figure A: voltage sensing → comparator → amplifier → thyristor control • Role of the set voltage adjustment / potentiometer and how the external manual "trimmer" ties into (or is bypassed from) that reference

💭 Think About

• Look at the arrows into and out of the block labeled "Comparator" and decide which blocks are directly connected to it when the external trimmer is NOT installed. • Ask yourself: what two quantities must an AVR compare in order to know whether to increase or decrease field current? Where do those two quantities originate in this diagram? • Trace where the comparator’s output must go so that any error it detects can actually change generator voltage.

✅ Before You Answer

• Verify which blocks have arrows pointing INTO the comparator box (these are inputs) when the external trimmer is absent. • Verify which single block has an arrow coming OUT OF the comparator box (this is the output) and where that signal goes next in the AVR chain. • Confirm that the set-point reference comes from the internal set voltage potentiometer, and that removing the external trimmer does not remove this internal reference path.

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