Approximately How Often Do Lunar Eclipses Occur

question 91

Multiple Choice

Approximately how often do lunar eclipses occur?

• A) twice every year
• B) three times every year
• C) once per month
• D) twice every 11 months
• E) once every 11 years

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Definitions:

Stator Core

The stationary part of an electric generator or motor, especially the magnetic core, around which the winding is arranged.

Small Wire

A conductor of electricity characterized by a relatively small cross-sectional area, affecting its resistance and current-carrying capacity.

Single-phase Synchronous Motor

A type of AC motor that operates at a constant speed, synchronized with the frequency of the supply current.

Hysteresis Motor

A type of synchronous motor that operates using the hysteresis loss principle in the rotor to achieve torque, known for quiet operation and precise speed control.