GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (OLD) EXAMINATION - WINTER 2018
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Subject Code:151703 Date: 11/12/2018Subject Name: Electronics In Industries
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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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)
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(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)
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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)
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OR
Q.4 (a) With waveforms describe 1-F half-wave uncontrolled rectifier with resistive-inductive load. (07)
(b) A voltage 220 sin (100pt) is applied to a half-wave uncontrolled rectifier with 10kO. 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 5kO. Input voltage to each diode is 200 sin (2p50t). 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)
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OR
Q.5 (a) With waveforms describe 1-F half-wave controlled rectifier with resistive load. (07)
(b) With waveforms describe 1-F full-wave controlled bridge rectifier with resistive load. (07)
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