Discussion
Universal motor cannot be used for _______.
Answer: D
A universal motor cannot be used as a power factor corrector. A universal motor is a series motor that runs on AC or DC and gives high speed and high starting torque, which suits a food mixer, a hand drill and a hair drier.
A power factor corrector needs a machine that can draw leading current, such as an over-excited synchronous motor (a synchronous condenser), and a series motor cannot do that. So the fourth option is correct.
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