Maharashtra State Board of Technical Education 2012-6th Sem Diploma Electronics Engineering (DEE) for Electrical Engineering Subject Power Electronics and Drives(12232) - Question Paper
MSBTE Sample ques. Paper for Electrical Engineering
Sixth Semester
Subject Power Electronics and Drives(12232)
Sample Question Paper
Scheme - E
Course Name : Electrical Engineering Group Course Code : EE.EP
12232
: Sixth
: Power Electronics and Drives
: 100
Time: 3 Hrs.
Semester Subject Title Marks
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 m sequential order
Q.l A) Attempt any THREE of the following: 12 Marks
a) Describe the construction of SCR with neat sketch also draw- its symbol.
b) State & explain the specification of SCR.
c) List the factors required for selection of heat sink used for SCR.
d) Draw and explain the characteristics of SCR.
Q.l B) Attempt any ONE of the following: 06 Marks
a) Describe the step up and step down chopper with neat diagram.
b) Explain with waveforms the constant & variable frequency system for chopper
control.
Q.2 Attempt any FOUR of the following:
16 Marks
a) Draw' circuit diagram of single phase fully controlled Full wave converter with RL load & explain its workmg.
b) What is the effect of source impedance on performance of 1 phase fully controlled bridge converter?
c) Draw' circuit diagram 3 phase fully controlled bridge converter with R-L load.
d) Differentiate between single and three phase controlled converter on the basis of no. of SCR, current capacity, application and cost.
e) Draw* neat diagram of cycloconverter for speed control of 3 phase induction motor.
f) Describe the operation of speed controls of 3 phase induction motor using variable frequency variable voltage method.
Q. 3 Attempt any FOUR of the following: 16 Marks
a) Describe the pulse width modulated and sinusoidal pulse width modulated inverter.
b) Explain with circuit diagram the application of SCR for VAR compensation in power system.
c) Draw the circuit diagram of single phase half and full bridge inverter.
d) With the block diagram describe the function of SCR static excitation system for alternator.
e) Compare series and parallel inverter on the basis of circuit components, current rating, type of communication and type of O/P waveforms.
Q.4 A) Attempt any THREE of the following: 12 Marks
a) Draw circuit diagram and describe the operation of D.C. series motor speed control using step up chopper.
b) Describe the working of A.C. servomotor with neat diagram.
c) Draw the circuit diagram of 3 phase series inverter and explain its working.
d) Describe the speed control of D.C. series motor using single phase fully controlled converter
Q.4 B) Attempt any ONE of the following: 06 Marks
a) Describe the operation of single phase and three phase cycloconverter with neat circuit diagram.
b) Describe the operation of 3 phase cycloinverter with circuit diagram. Also draw waveforms.
Q.5 Attempt any TWO of the following: 16 Marks
a) Draw the neat diagram and describe the working of single phase fully controlled HW converter with RL load.
b) Describe the operation of basic series inverter. State its limitation.
How the limitation is overcome in modified series inverter.
c) With neat diagram describe the working of static A.C. and D.C. circuit breaker.
Q.6 Attempt any FOUR of the following: 16 Marks
a) Explain dv/dt triggering and light triggering of SCR.
b) Explain Jones chopper with neat diagram.
c) Describe the operation of basic parallel inverter with neat diagram.
d) Explain with diagram external control of A.C. voltage and internal control of inverter.
e) Explain with diagram of speed control of D.C. servomotor.
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| Earning: Approval pending. |
