Simplify the Expression

question 17

Multiple Choice

Simplify the expression.

• A) 49
• C) 6
• D) 36
• E) 81

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Definitions:

PWM

Pulse Width Modulation, a technique used to control the amount of power delivered to an electrical device by varying the duty cycle of a pulse signal.

Four-quadrant

Refers to operating modes of a drive or control system that can handle both positive and negative directions of both power and torque in all four quadrants of operation.

Magnetic Motor

An electric motor that uses magnetic fields generated by electromagnets or permanent magnets to produce rotation.

NEMA Design

Refers to standards set by the National Electrical Manufacturers Association for various types of electrical equipment, including motors.