Question 358Electricity & Electronics - Assistant Engineer

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As shown in figure "A" of the illustrated PLC sub-circuit, what type of circuit is depicted? Illustration EL-0230

Diagram for USCG Electrical Assistant: As shown in figure "A" of the illustrated PLC sub-circuit, what type of circuit...
AAC input unit
BAC output unit
CDC input unit
DDC output unit
AI Explanation

The correct answer is C) DC input unit. The illustration EL-0230 shows a PLC (Programmable Logic Controller) sub-circuit, and the depiction in figure "A" represents a DC input unit. This is because the circuit has direct current (DC) terminals, which are used to connect sensors, switches, or other DC-powered devices to the PLC for data input and processing. The other options are incorrect because AC input units utilize alternating current (AC) terminals, while AC output units and DC output units are used to control AC-powered or DC-powered devices, respectively, rather than for data input.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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