Cochin University of Science and Techology (CUST) 2008 B.Tech Electronics and Communications Engineering Btec EC 406 INDUSTRIAL AND POWER ELECTRONICS - Question Paper

406 INDUSTRIAL AND POWER ELECTRONICS

RTSiC>-IV 08 016-A

B. Tech Degree IV Semester Examination, April 2008 .

EB/EC/EE/EI 406 INDUSTRIAL AND !()WKR ELECTRONICS \

(2006 Scheme)

rime : 3 Hours    Maximum Marks: 101)

HART-A (Answer ALL questions)

.(# x 5 40)

I. (a) Kxplain the turn-off characteristics of an SCR.    

(c)    Briefly explain single-phase half wave controlled rectifier with R-l.. lotul.

(d)    Briefly explain any one scheme for the speed control of a separately excited DX! motor.

(c) Explain auxiliary commutation scheme for SCRs.

(g)    Explain dvdt protection of SCR's.

(h)    Briefly explain the applications of induction heating.    t ,

*

i*\r r - b

II    Explain the constructional details and operation of a TRIAC. What are different modes

OK

III,    Explain the series operation of SCRs. Also explain static and dynamic equalizing

circuits used in the series operation.    (15)

IV,    With relevant waveforms, discuss the operation of a single-phase full-wave fully controlled rectifier without free-wheeling diode and feeding an RL load.    (15)

OR

V,    Draw the circuit of a 3 phase full-wave rectifier with R load and explain its working

with suitable waveforms.    <15)

VI (a) Explain the working of Jones Chopper.    Oty

OR

VU, Explain slip-power recovery scheme in the speed control ol induction motors.    (15)

VIII    (,a) Explain the working of a Boost converter with the help of necessary diagrams.    (10)

OK

IX    ( a) Explain online and offline UPS with the help of Block diagram.    (9)

(b) Explain the principle and theory of dielectric heating,    (6)

Attachment: cochin-university-of-science-and-techology--cust--2008-b-tech-electronics-and-communications-engineering-37119-1.JPG

Earning:   Approval pending.