In Spite of Countless Time­saving Devices-Automobiles,telephones,photocopiers,fax Machines,and So On-Most of Us

question 77

Multiple Choice

In spite of countless time­saving devices-automobiles,telephones,photocopiers,fax machines,and so on-most of us complain about a relative lack of

• A)time.
• B)money.
• C)information.
• D)work.

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Definitions:

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.

Operating Characteristics

The specific features or parameters that define the performance of a system or device under specific conditions.