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Exam 23: Ac Inverter Drives

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Question 1

Multiple Choice

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

A) overspeed
B) overheating
C) short-circuit
D) open-circuit

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

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verified

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Question 2

Multiple Choice

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

A) capacitor
B) inductor
C) resistor
D) current source

E) A) and C)
F) A) and B)

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B

Question 3

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

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.

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

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

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

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.

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.

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

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

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

What is the feedback device used in a pulse-width modulated variable voltage inverter called?