Discussion
What is the possible cause if the mixer motor runs on one speed only?
Answer: C
A mixer-grinder with a universal motor gets its different speeds from tappings on the field winding. If the motor runs on only one speed, the likely cause is that part of the field winding, which carries the tappings, is burnt out, so the speed taps no longer work. Loose brushes would cause sparking and noise, overloading would slow or stall the mixer at every setting, and absence of an earth connection is a safety fault, not a speed fault. The answer is Partially burnt out field winding, option (C).
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