Op-amp circuits that pass certain selected frequencies while rejecting signals outside this range are called
A) amplifiers B) processors C) filters D) converters
C
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A ____ is usually replaced as preventive maintenance during a clutch job.
A. clutch hub B. clutch fork C. release bearing D. slave cylinder
Both the delta-connected and star-connected patterns for three-phase motors involve nine leads. In the event that the lead markings are destroyed, how can an electrician determine whether the motor is delta connected or star connected?
What will be an ideal response?
Corner radius is used to cut away material at a corner to relieve stress and help in the forming process.
Answer the following statement true (T) or false (F)
Answer the following statement(s) true (T) or false (F)
1. When a circulator with the flat curve is used, the differential pressure across the circulator changes dramatically as zone circuits turn on and off. 2. The electronically commutated motors and improved hydrodynamic design of current generation variable-speed pressure-regulated circulators provide wire-to-water efficiencies that are approximately double those of standard wet-rotor circulators with permanent split capacity. 3. If a fixed-speed circulator is selected, a differential pressure bypass valve should be installed to reduce the potential for flow noise when only one or two zones are active. 4. Over the last two decades, many heating professionals have come to recognize the failure of PEX and PEX-AL-PEX tubing as universal piping materials for residential and light commercial hydronic systems. 5. Primary/secondary (P/S) piping is the only way to achieve hydraulic separation between simultaneously operating circulators.