DC MACHINES AND TRANSFORMERS EE205 KTU B TECH QUESTIONS FOR SECOND YEAR [S3] STUDENTS | QUESTION BANK


APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

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DC MACHINES AND TRANSFORMERS
 QUESTION PAPERS


PART A

(Answer All Questions)

1.What is the Role of dummy coils in a wave wound d.c. machine?

2.Why are the brushes given a backward shift in a d.c. motor?

3.Explain the critical resistance of a dc machine.

4.Explain the voltage building up process in a dc shunt generator.

5.Explain the conditions to be satisfied for the parallel operation of d.c generators.

PART B

(Answer Any Two Questions)


6.What is Communication ? What are the Methods to improve the Communication?

7.Derive an expression for demagnetizing and cross magnetizing AT/pole.

8.What are the speed control methods in a dc shunt motor?Explain with diagrams.

9.The open circuit characteristics of a dc shunt generator driven at 300 rpm is as follows:

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The field resistance is adjusted to 354.5 ohm and the speed is 300 rpm.

Determine the following:

1) Graphically the no-load voltage

2) Critical field resistance

3) Critical speed for the given field resistance

4) Additional resistance inserted in the field circuit to reduce the no-load voltage to 175v.

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