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Answer: b
Explanation: The excitation which is provided is the series excitation in the small
universal commutator motors. The type of supply provided is dc or ac supply.
Small universal commutator motors typically use series excitation. They can operate on both AC (alternating current) and DC (direct current) supply.
Universal commutator motors typically use series excitation. They are designed to operate on both alternating current (AC) and direct current (DC) supplies.