The start and termination of the defrost mode is usually based on _____.
a. time and/or coil temperature
b. ice thickness and/or time
c. suction pressure and/or coil temperature
d. suction pressure and/or time
[Ques. 2] In which of the following modes would you expect to find hot, high-pressure refrigerant flowing through
the outdoor coil?
a. Cooling only
b. Cooling and defrost
c. Heating only
d. Heating and defrost
[Ques. 3] When the emergency heat feature of a heat pump is activated, the usual effect on the heat pump is _____.
a. only the supplemental heaters and the blower operate
b. electric heaters operate if the compression heat is inadequate
c. the compressor and electric heaters operate together
d. the gas or oil furnace is disabled
[Ques. 4] To ensure the welding current will not pass through seals, bearings, or other contacting surfaces that could
be damaged from arcing, make sure to correctly position the _____.
a. electrode
b. air hose
c. workpiece clamp
d. arc torch
[Ques. 5] To keep molten metal from splattering nearby equipment or personnel during A-CAC cutting activities,
make sure that _____.
a. both a compressed air supply and a water-source are on hand
b. barrier tape marks off the area
c. cones are set within 25 feet (7.6 m) of the work area
d. flame-resistant shields or curtains are erected
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