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TL;DR

Study ratio and proportion concepts used in scaling, voltage dividers, and material calculations. Proportional reasoning appears throughout electrical work.

By Valenke Exam Prep Team·Last updated 2026-06-03

Free A/C & Refrigeration (Art. 440) Practice Questions

Master Electrician License Exam · Special Equipment

This module covers A/C & Refrigeration (Art. 440) as part of the Special Equipment section, testing your understanding of core concepts and their practical application.

ExamMaster Electrician License Exam
Pass Rate45%
Duration300 minutes
ModuleA/C & Refrigeration (Art. 440)

Why A/C & Refrigeration (Art. 440) matters

A/C & Refrigeration (Art. 440) is a commonly tested topic on the Master Electrician License Exam because it covers fundamental knowledge required for competent professional practice.

Sample Practice Questions (5)

1. Two A/C compressors are supplied by a single feeder. Compressor 1 has an RLA of 30A and Compressor 2 has an RLA of 45A. Both are single-phase. Per NEC 440.33, what is the minimum feeder conductor ampacity?

  • 86.25 amperes
  • 75 amperes
  • 93.75 amperes
  • 56.25 amperes

2. A rooftop A/C package unit has a compressor RLA of 65A and a BCSC of 80A. Per NEC 440.22(A), what is the maximum circuit breaker size permitted for branch circuit protection?

  • 150 amperes
  • 113.75 amperes
  • 100 amperes
  • 175 amperes

3. A 3-phase A/C unit has a compressor RLA of 40A and a condenser fan motor FLA of 5A. The nameplate BCSC is 50A. Per NEC 440.33, what is the minimum conductor ampacity for the circuit supplying this unit?

  • 55 amperes
  • 50 amperes
  • 56.25 amperes
  • 45 amperes

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4. Per NEC 440.22(A), the rating of the branch circuit short-circuit and ground-fault protective device for a motor-compressor shall not exceed what value?

  • 175% of the rated-load current or branch circuit selection current, whichever is greater
  • 125% of the rated-load current
  • 250% of the rated-load current
  • 200% of the branch circuit selection current

5. A single-phase A/C compressor has a rated-load current (RLA) of 28 amperes and a branch circuit selection current (BCSC) of 35 amperes on the nameplate. Per NEC 440.32, what is the minimum conductor ampacity?

  • 43.75 amperes
  • 35 amperes
  • 28 amperes
  • 56 amperes

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Frequently Asked Questions

How many A/C & Refrigeration (Art. 440) questions are on the Master Electrician License Exam?▼
The Special Equipment section, which includes A/C & Refrigeration (Art. 440), typically represents a significant portion of the exam. Focus on understanding core concepts rather than memorizing exact question counts, as the exam uses adaptive testing.
What is the best way to study A/C & Refrigeration (Art. 440)?▼
Use active recall and spaced repetition rather than passive reading. Practice with realistic exam questions, review explanations for both correct and incorrect answers, and focus on understanding the reasoning behind each concept.
What topics within A/C & Refrigeration (Art. 440) should I focus on most?▼
Focus on the concepts that appear in our practice questions and any areas where you consistently score below 70%. The adaptive practice mode will automatically target your weak areas for efficient study.