Which brushes are not insulated?
A) Power B) No brushes are insulated
C) Ground D) None of these
C
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Which control is designed to remove air that is dissolved in water from a hydronic system?
a. air vent b. expansion tank c. compression tank d. air separator
All of the following statements are true EXCEPT:
A. if mineral oil is mistakenly installed in an R-134A system, it will not lubricate the compressor properly and will separate in the accumulator. B. moisture causes fewer problems in R-134A systems because it mixes with the PAG oil. C. moisture control in R-134A is provided by the desiccant in the receiver/dryer or the evaporator. D. commercial refrigeration units use ester oils, which are hygroscopic.
For the circuit in Fig. 9.69, find the input impedance Zin at 10 krad/s.
 FIGURE 1.png)
The wiper terminal and one of the two outside terminals of a 100 k? potentiometer are soldered together. If the wiper is set at the center position, what resistance exists between the two outside terminals?
A) 100 k? B) 50 k? C) 0 ? D) 80 k?