A round to rectangular fitting is called a(n) ______________________________.
Fill in the blank(s) with the appropriate word(s).
square to round transition
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A load consisting of induction motors is drawing 80 kW from a 220-V, 60 Hz power line at a pf of 0.72 lagging. Find the capacitance of a capacitor required to raise the pf to 0.92.
What will be an ideal response?
When troubleshooting single-phase compressor motors, it is important that the technician:
A) Measure the phase displacement between the two power legs. B) Check the frequency of the power source. C) Check the start relay, start capacitor, and run capacitor. D) Check for phase reversal between L1 and L2.
What is the advantage of using multiple compressors on a supermarket rack system?
A) System capacity can match refrigeration loads, which vary over a wide range. B) Extra compressors provide backup in case one quits working. C) Using multiple parallel compressors makes the use of multiple refrigerants possible. D) The compressors can operate at a higher compression ratio as a parallel group.
Compare heat-transfer rates through layers of human skin, human muscle, and human fat tissue. Assume a 5-mm-thickness and a temperature difference of 2 ºC across each layer.
What will be an ideal response?