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Scheme E

Sample Question Paper

Course Name : Electronics Engineering Group

Course Code : ET/EN/EJ/EX/ED/EI

Semester : Fifth

Subject : Industrial Electronics

Marks : 100 Time: 3 Hours

Instructions:

1. All questions are compulsory.2. Illustrate your answers with neat sketches wherever necessary.3. Figures to the right indicate full marks.4. Assume suitable data if necessary.5. Preferably, write the answers in sequential order.

Q.1(A) Attempt any THREE

a. Sketch vertical structure of power transistor and describe propertiesof any two regions.

b. Draw labeled circuit diagram and input/output waveform of midpoint controlled rectifier with resistive load.

c. State the purpose for which UJT is used in triggering circuit.Describe the working with circuit diagram.

d. Draw symbol ofi) IGBT ii) SBS iii)GTO iv)PUT

12 Marks

Q.1(B) Attempt any ONE

a. What is commutation? Describe operation of class C commutationwith circuit diagram and wave shape and state its applications.

b. Draw two transistor analogy of SCR and describe its working.

06 Marks

Q.2 Attempt any FOUR

a. Draw I-V characteristics of power transistor and level differentregion.

b. Compare SCR and TRIAC. (Any four points)c.

Draw circuit of step down chopper. State how o/p is related to dutycycle.

d. Draw half controlled bridge rectifier with R-L load. How o/p voltagecan be varied.

e. Draw circuit of 1 phase Halfwave controlled rectifier with waveform. Write the effects of free wheely diode.

f. Write the different turn on methods of SCR. Explain dv/dt triggeringmethod of SCR.

16 Marks

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Q.3 Attempt any FOUR

a. Draw R-firing circuit; write its drawback and how to overcome it?b. Write any two application of PUT. Draw the labeled circuit of PUT

relaxation oscillator.

c. Draw circuit and waveshape of single phase Fullwave Bridgecontrolled rectifier with resistive load.

d. Draw the circuit and write drawback of half controlled rectifier.e. Draw the characteristics of Diac. Write four application of it.

16 Marks

Q.4 (a) Attempt any THREE

a. Draw the circuit and write four applications of three phase half wavedelta-wye rectifier.

b. Compare full wave controlled rectifier and half wave controlledrectifier.(for four points)

c.

Above waveshape shows the o/p of certain circuit answer the

following questions.1. Write its name.2. Draw circuit diagram of itself.

d. Draw neat sketch of IGBT showing its construction details alsodraw its V-I characteristics.

12 Marks

Q.4 (b) Attempt any ONE

a. Draw the V-I characteristics of a TRIAC and describe four operatingmode of TRIAC.

b. Draw a suitable commutation circuit which is used in basic seriesinverter and explain it.

06 Marks

Q.5 Attempt any FOUR

a. Draw RC triggering circuit for SCR. Explain with waveform.b. Draw the circuit and write two application of parallel inverter.c. Write the necessary condition to turn on the SCR and turn off the

SCR.d. Draw center tapped full wave controlled rectifier with RL load also

draw input/ output waveform.e. Draw the output waveform of 1 phase half wave controlled rectifier

16 Marks

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O/P

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with resistive load at firing angle.

i) = 0 ii) =90

a. Compare forced and natural commutation (four points).Q.6 Attempt any FOUR

a. Draw circuit diagram of basic series inverter. Describe its workingprinciple.

b. Draw the circuit and input/output waveform of six phase half waverectifier.c. Compare controlled and uncontrolled rectifier (Any four points).d. Write various advantages of poly phase rectifier (Any four points).e. Draw the I-V characteristics of

i) SCS ii) LASCR

16 Marks