Using Fig. 8.63, design a problem to help other students better understand finding initial and final values.
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Although there are many ways to work this problem, this is an example based on the same kind of problem asked in the third edition.
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During or following an evacuation, which of the following typically indicates a refrigerant circuit has a leak?
a. The vacuum gauge drops rapidly to 500 microns and will not go lower. b. The vacuum gauge shows a pressure rise that continues up to 0 psig when the pump is isolated. c. The vacuum gauge shows a pressure rise but levels off between 1,000 and 2,000 microns when the pump is isolated. d. A constant reading on the vacuum gauge of 500 microns is displayed when the pump is isolated.
A fixed-plate air-to-air heat exchanger used in an ERV unit _____.
a. pre-cools ventilation air in the winter b. transfers sensible heat only c. pre-cools ventilation air in the summer d. transfers latent heat only
While having a discussion, Technician A says that launch shudder occurs on acceleration from a standing start and continues until about 25 mph before it disappears. Technician B says that first order vibration occurs on acceleration from a standing start to about 25 mph before disappearing. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
What do the alternator slip rings and brushes connect to?
A. Ground. B. Stator windings. C. Alternator output circuit. D. Rotor field windings.