Why do some technicians recommend using a separate refrigerant tank when purging hoses?
A) To maintain pressure levels B) To preserve system charge
C) To preserve coolant D) To continue refrigerant flow
B
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Guardrails, toe boards, and midrails should be on all steel scaffolds ______ .
A. at elevations of at least 5' B. at elevations of 6' or more C. at any elevation greater than 4' D. regardless of elevation
If you want to increase your shop's gross profit percentage you can ________.
A) Change your mix of technicians B) Give your technicians raises C) Decrease your fixed expenses D) More than one of the above are correct
What will a Zener diode do at breakdown voltage?
A. Allow reverse current to flow B. Stop the flow of reverse current C. Sustain damage as a result of current overload D. Stop the flow of either forward or reverse current
Large rooftop package AC units often use ________ to help draw in fresh air to meet code requirements and to cool if temperature and humidity permit
A) low pressure B) airflow C) enthalpy D) an economizer