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Thyristor Drive Drawbacks Quiz

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Questions and Answers

What is an advantage of using thyristors for controlled rectification?

Production of electromagnetic interference due to switching action
Ability to constitute a firing circuit with digital electronic devices (correct)
Higher overload capability compared to M-G set
Lower maintenance requirements and compact size

What is a drawback of thyristor drives according to the text?

Fast response and reliable operation
Compact size and low maintenance requirements
Ability to adjust supply power factor with synchronous motor
Higher ripple content causing motor heating and commutation problems (correct)

How can the power factor in the AC supply be kept high under high firing angle operating conditions?

By adopting regenerative braking
Adding a reactor in the armature circuit
By adjusting the field excitation of the synchronous motor in an M-G set system (correct)
Using digital electronic devices for gate control

What is a potential issue caused by the switching action of thyristors?

<p>Distortion of the supply voltage and electromagnetic interference (B)</p> Signup and view all the answers

What characteristic makes thyristorized rectifier circuits suitable for applications involving regenerative braking?

<p>Ability to change firing instant for inversions (B)</p> Signup and view all the answers

Flashcards

Thyristor Firing Circuits

Using digital circuits to control when the thyristor turns on, allowing for precise control of the DC output.

Thyristor Drive Drawback

The rapid switching of thyristors causes fluctuations in the DC output, which can lead to motor heating and problems with commutation.

High Power Factor in Thyristor Drives

Adjusting the excitation of the synchronous motor in an M-G set helps to maintain a high power factor, even when the firing angle is high.

Thyristor Switching Problems

The switching action of thyristors can create distortions in the AC voltage and generate electromagnetic interference (EMI).

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Regenerative Braking with Thyristors

The ability to adjust the firing instant allows thyristor circuits to reverse the power flow, enabling energy recovery during braking.