A common practice in condensing units is to use a contactor with only one set of contacts opening only one side of the power to the unit. This is to ____.
A. reduce the cost of the contactor
B. make it easier to wire the unit
C. teach the service technician not to put hands in the unit with the power on
D. provide off-cycle heat to the compressor
Answer: D
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____________________ or lash is necessary to allow for heat expansion, oil clearance, and for proper sealing of the valve.
Fill in the blank(s) with the appropriate word(s).
Which of the following is the most important advantage of SSB systems?
A. Reducing the noise present at receiver by half. B. All information is contained within varying-amplitude sidebands. C. More effective utilization of the available frequency spectrum. D. The carrier amplitude and frequency always remain constant.
What is the purpose of checking the supply voltage before operating the system?
A) To determine the voltage drop in the wire B) To verify that the supplied voltage is within manufacturer's specifications C) To determine which power leg is positive and which is negative D) To figure out where to connect the power wiring to the unit
The part of a DC generator that transmits the current from the generator to its external circuit is(are) the
_____. a. brushes b. commutator c. armature d. slip rings