No. of Pages:2

Max. Marks: 60

1.

2.

3.

b. Explain static & dynamic characteristics of Power Diodes

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FIRST SEMESTER M.TECH DEGREE EXAMINATION, DECEMBER 2017
Electrical and Electronics Engineering

Specialization-Control Systems and Electrical Machines

01EE6303 Power Electronic Circuits

Answer any two full questions from each part
Limit answers to the required points.
Duration: 3 hours
PART A
(3)

a. Compare the characteristics of ideal and practical switches
(6)

a. Describe about the conduction & switching losses in an MOSFET (4)

b. Explain the operation of single phase voltage controller with RL load and derive

the expressions for the rms output voltage, rms and average thyristor current.

(5)

a. Explain how to implement two quadrant and four quadrant switches using power

electronics components. (4)
b. An ac voltage controller with On-Off control has a resistive load of 5-100 and the
rms input voltage is Vs. =120V, 60 Hz. The thyristors switch is on for 20 cycles
and off for 80 cycles. Determine (a) the rms output voltage,(b) the input power

factor and (c) the average and rms current of thyristors (5)
PART B

a. Explain the operation of boost converter and determine the value of inductance

and capacitance for continuous conduction mode. (4)

b. Explain the working principle of C uk converter and analyze the ripple in output

voltage (5)