Motors & Drives: A Practical Technology Guide

Chapter 9: Check Your Knowledge

This is the final exam for the book. Reviewing the "Check Your Knowledge" questions in each chapter would be helpful before taking this final set of questions.

1.

How is line notching corrected in a DC drive system?

2.

What is RFI and how is it controlled in a DC drive system?

3.

What are harmonics and what are the corrective actions to reduce them?

4.

What are the effective shielding and grounding methods used with AC drives?

5.

What is PID and how is it used?

6.

Name three factors that cause the efficiency of an AC motor to improve.

7.

What are the two separate electrical circuits in a DC drive system?

8.

What is the purpose of the commutator?

9.

What is the V/Hz ratio?

10.

Why are the laminations in the armature skewed?

11.

Where would an operator look in a drive to obtain specific information on status or fault conditions?

12.

For current to flow, what must be added to overcome resistance?

13.

What is a pulse tach and how does it work?

14.

Describe the difference between static and dynamic performance of a closed-loop system.

15.

What is the difference between a series wound and shunt wound DC motor?

16.

Why is proper tension control important in a web-fed system?

17.

Describe what the following circuits are used for in a DC drive:

  • summing circuit

  • current controller

  • current measuring/scaling

18.

What NEMA design class would provide the highest amount of starting torque, when connected...

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