Download GTU BE/B.Tech 2018 Winter 5th Sem Old 151703 Electronics In Industries Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem Old 151703 Electronics In Industries Previous Question Paper

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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?V (OLD) EXAMINATION ? WINTER 2018
Subject Code:151703 Date: 11/12/2018

Subject Name: Electronics In Industries

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Discuss the differences between a p-n junction diode and a schottky diode. 07
(b) Describe switching characteristics of power BJT. Indicate clearly the turn-on and
turn-off time.
07

Q.2 (a) Discuss the different types of DIAC?s and their working. 07
(b) Describe constructional details and working of an enhancement type power
MOSFET.
07
OR
(b) Describe static V-I characteristics of SCR. 07

Q.3 (a) Describe constructional details and modes of operation of a TRIAC. 07
(b) Describe turn-on and turn-off characteristics of an IGBT. 07
OR
Q.3 (a) Describe thyristor turn-on methods in detail. 07
(b) Describe basic structure and static characteristics of UJT. 07

Q.4 (a) Describe overvoltage protection snubber circuit for thyristor. 07
(b) Draw and describe jones commutation circuit. 07
OR
Q.4 (a) With waveforms describe 1-? half-wave uncontrolled rectifier with resistive ?
inductive load.
07
(b) A voltage 220 sin (100?t) is applied to a half-wave uncontrolled rectifier with
10K?. Calculate the maximum current, rms current, average current, ac power
input, dc power output, and ripple factor.
07

Q.5 (a) With waveforms describe full-wave uncontrolled bridge rectifier with resistive
load.
07
(b) In a full-wave uncontrolled rectifier, load resistance is 5K?. Input voltage to
each diode is 200 sin (2?50t). Calculate the maximum value of the current,
the average current, the rms current, dc power output, input power output,
form factor and ripple factor.
07
OR

Q.5 (a) With waveforms describe 1-? half-wave controlled rectifier with resistive
load.
07
(b) With waveforms describe 1-? full-wave controlled bridge rectifier with
resistive load.
07




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