All of the Following Statements About DC Brushless (DCBL) Motors

question 12

Multiple Choice

All of the following statements about DC brushless (DCBL) motors are true EXCEPT:

• A) A typical DCBL motor is 85-90 percent efficient, and higher efficiencies have been produced.
• B) As a DCBL rotor turns, its permanent magnetic fields interact with the stator's electromagnetic fields.
• C) Magnetic attraction pulls the rotor along in its continuing rotation, causing torque output.
• D) Maximum torque production of a DCBL motor occurs immediately, from when it starts until about 3,000 rpm.

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Definitions:

Treatments

The specific conditions applied to experimental units in research to investigate potential causative effects.

T-statistic

A statistical measure used to determine the significance of the difference between two sample means compared through their standard error.

F-statistic

A value calculated in statistical analysis to assess the significance of group differences in a data set.

Alternative Hypothesis

A statement in statistics that is tested against the null hypothesis, suggesting that there is a significant difference or effect.