The Unified Model of AGN Suggests That Quasars, Seyfert Galaxies

question 15

Multiple Choice

The unified model of AGN suggests that quasars, Seyfert galaxies, and radio galaxies are

• A) unrelated, although they are all very luminous galaxies at radio wavelengths.
• B) powered by differring mass accretion rates onto supermassive black holes.
• C) driven by violent mergers of two gas-rich spiral galaxies.
• D) similar phenomena but viewed from different orientation angles.
• E) all powered by high rates of star formation and supernova explosions.

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Definitions:

Exciter Ring

Preferred term by one OEM for the toothed reluctor used in a wheel speed sensor.

Tone Wheel

Tone wheel, in automotive contexts, refers to a component that works with sensors to monitor the speed of rotating parts like the wheels or crankshaft, generating a signal that varies with speed.

Electrical Principle

Fundamental laws or concepts in electricity, such as Ohm's law, which govern the behavior and operation of electrical systems and components.

Wheel Speed Sensor

Reluctor-type electromagnetic device used to signal wheel speed data to an antilock controller. Consists of a permanent magnet and toothed reluctor. As the reluctor wheel cuts through a magnetic field, AC is generated and a frequency signal produced.