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VFDs are motor controllers which drive the motor by adjusting the voltage and frequency supplied to it. VFDs feature converter which consists 6 diodes, just like the check valves of a plumbing system. These diodes allow the flow of current in a single direction which is mentioned in the diode symbol.
8. Electronic variable frequency drive (VFD) connected to motors: a) provide variable speed with high efficiency b) induces eddy-current in the secondary member of the clutch mechanism c) is not suitable for variable torque load d) does not provide variable speed and has low-efficiency 9. Variable speed can not be obtained with ____.