Oregon Contractors License Exams

Oregon Electrical Contractor

Sample Questions for the Oregon Electrical Contractors Exam

  1. What is the term for the winding of the transformer which is connected to the source of power?
    1. High-tension winding
    2. Primary winding
    3. Secondary winding
    4. Core winding
  2. What is the largest number of two-pole circuit breakers that can be used on a lighting and appliance branch circuit panel board in a single cabinet?
    1. 14
    2. 21
    3. 34
    4. 42
  3. An electrical conductor is made up of 19 strands each with a diameter of 0.0837 inches. The approximate circular mil area of the conductor is:
    1. 105,600 circular mils
    2. 133,100 circular mils
    3. 184,200 circular mils
    4. 211,600 circular mils
  4. Wiring which is installed to meet minimum requirements of the National Electrical Code is:
    1. adequate to meet future needs
    2. adequate for present needs
    3. always the most efficient wiring
    4. for all practical purposes safe & free from hazard
  5. A single family dwelling living are is 2,680 square feet, with all 120 volt general illumination circuits rated 15 amperes. The minimum number circuits required is:
    1. four
    2. five
    3. six
    4. seven
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