Question 1
A 480-volt, three-phase commercial feeder supplies a balanced load drawing 85 amperes at a power factor of 0.88 lagging. What is the total real power consumed by this three-phase load in kilowatts (kW)?
Correct Answer:
62.2 kW
Question 2
A 480V, 3-phase, 3-wire branch circuit feeds a continuous load of 60 A over a distance of 250 feet. If THHN copper conductors with a circular mil area of 26,240 CM (1 AWG) are used, what is the calculated voltage drop assuming a K-factor of 12.9?
Correct Answer:
12.7 V
Question 3
In a 480Y/277-volt, 3-phase AC system, what is the peak-to-peak voltage of the line-to-neutral sinusoidal waveform?
Correct Answer:
783.5 V
Question 4
A 75 kVA, 3-phase step-down transformer has a 480V delta primary and a 208Y/120V wye secondary. What is the maximum full-load secondary line current rating?
Correct Answer:
208.2 A
Question 5
A series circuit operating at 60 Hz contains a 15-ohm resistance, an inductive reactance of 25 ohms, and a capacitive reactance of 17 ohms. What is the total impedance (Z) of the circuit?
Correct Answer:
17.0 ohms
Question 1
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Prepare with the AZ ROC C-11 Electrical (Commercial) Practice Questions - Arizona ROC C-11 CR-11 Electrical (Commercial) Examination Exam practice quiz. This question bank includes 100 questions covering commercial, section, conductors, article, and copper. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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AZ ROC C-11 Electrical (Commercial) Practice Questions - Arizona ROC C-11 CR-11 Electrical (Commercial) Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on commercial, section, conductors, article, and copper. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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