What are the two basic types of distribution voltage regulators?

The correct answer focuses on the types of distribution voltage regulators used in electrical systems. Induction regulators and step regulators are both integral to maintaining voltage levels within acceptable ranges in distribution networks.

Induction regulators operate by utilizing electromagnetic induction to adjust voltage levels quickly based on demand and can maintain consistent voltage in varied load conditions. This regulation is particularly useful in complex distribution systems where power demand fluctuates throughout the day.

Step regulators function by providing incremental changes in voltage. They adjust the output voltage in discrete steps, allowing for controlled voltage adjustments as load conditions change. This type of regulator is typically used in scenarios where the voltage supply needs to be finely tuned for optimal performance, particularly in longer distribution lines.

The other options mention types or categories that do not directly pertain to the basic classification of voltage regulators in the context of electrical distribution systems. For example, step up and step down refer to a general principle of transformer operation rather than specific types of voltage regulators. Similarly, polyphase and monophase refer to types of electrical systems rather than regulators themselves, while induction and toroidal are more concerned with transformer design rather than the regulation function.