District of Columbia Contractors License Exams

District of Columbia Journeyman Refrigeration AC Mechanic

Sample Questions for the District of Columbia Journeyman Refrigeration AC Mechanics Exam

  1. What is the purpose of a “vacuum pump”?
    1. Charge the unit
    2. Adds oil to the compressor
    3. Removes oil from the compressor
    4. Removes noncondensible gases from the system
  2. Which of these is NOT a heat transfer method?
    1. Radiation
    2. Compression
    3. Conduction
    4. Convection
  3. For a fluid to flow from one point to another there must be a difference in _____ between the two points to cause the flow?
    1. Flow elevations
    2. The tubing
    3. pressure
    4. resistance
  4. What are the indications of bad valves in a compressor?
    1. Short cycling
    2. Long run cycling
    3. High suction and low head pressure
    4. Low suction and high head pressure
  5. What is a gauge manifold used for?
    1. Checking pressures
    2. Charging
    3. Adding oil
    4. All of the above
Answers: Click Here to show the answers.