Roll No. Total No. of Pages : 02
Total No. of Questions : 18
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B.Tech. (EE) (2012 Onwards) (Sem.=5)
B.Tech. (Electrical & Electronics Engg.) (2012 Onwards)
B.Tech. (Electrical Engineering & Industrial Control)/
(Electronics & Electrical Engg.) (2012 to 2017)
POWER ELECTRONICS
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Subject Code : BTEE-504
M.Code : 70557
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
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SECTION-A
Answer briefly :
- What is the function of heatsink in SCRs?
- What are the different methods to turn-off the thyristor?
- What are the applications of cycloconverter?
- Define latching current.
- Draw the circuit of snubber circuit.
- Discuss the significance of freewheeling diode.
- List various types of commutations.
- Draw the symbol and characteristics of TRIAC.
- What are line commutated inverters?
- What is resistance firing circuit?
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SECTION-B
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- Describe the principle of dc chopper operation. Derive an expression for its average dc output voltage.
- SCRs with a rating of 2000V and 200 A are available to be used in a string to handle 6KV and 2 KA. Calculate the number of series and parallel units required in case of derating factor is 0.1 and 0.2.
- What do you mean by commutation? Discuss class C and class D commutation with circuit diagram and waveforms.
- What is the use of AC voltage controller? Discuss the single-phase AC voltage controller with RL load.
- What is the use of cycloconverter? Discuss three phase to single phase cycloconverter with waveforms.
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SECTION-C
- Draw and explain single phase voltage source bridge inverter. Also give its steady state analysis.
- Draw and explain the static and dynamic characteristics of Silicon controlled rectifier.
- What do you mean by phase control rectifier? Draw and explain the voltage waveforms for three phase full converter. Also give the expressions for output voltage.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)
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