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Exam 23: Ac Inverter Drives

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Question 1

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The feedback device used in a pulse-width modulated variable voltage inverter is called a _____.

A) buffer amplifier
B) tachometer-generator
C) comparator
D) thermistor

E) None of the above
F) B) and D)

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Question 2

Multiple Choice

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With respect to electrical power in an industrial environment, frequent outages, voltage spikes and sags, and electrical ____ are normal operating occurrences.

A) overheating
B) overhauling
C) noise
D) regulation

E) A) and D)
F) A) and C)

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Question 3

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An AC drive has three basic sections: the converter, the DC filter, and the output.

In an AC inverter drive, the four main areas of possible problems are the same as those in a DC drive.

A typical DC link, also called a DC filter or DC bus, is a filter circuit composed of an inductor and a capacitor.

Flux vector drives operate by monitoring rotor position and changing the rotor's position as compared to its orientation to the ____.

If the signal wires from feedback devices are routed next to high-power cables, ____ can occur.

The ____ is a type of inverter drive in which the current is controlled while the voltage is varied to satisfy the motor's needs.

In a variable voltage inverter, the DC voltage is controlled, and the DC is free to respond to the motor needs.

An inverter converts the applied DC voltage to a(n) ____ DC voltage.

Inverters are used not only to vary the speed of the squirrel-cage motor, but also to vary its ____, start the motor slowly and smoothly, and increase the motor's efficiency.

All variable voltage inverters lack ____ protection, and they cannot handle oversized motors.

The sensors used to sense motor temperatures consist of a nonadjustable ____ switch that is normally closed and opens when the temperature rises to a certain level.

For proper motor operation, the V/Hz ratio (also called the V/f ratio) must be kept equal to one.

In a current source inverter, a large ____ is used in the DC link section.