Download PTU B.Tech 2020 March EE 5th Sem Power Electronics Question Paper

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Roll No.

Total No. of Pages : 02

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Total No. of Questions : 09

B.Tech. (EE) (Sem.-5)

POWER ELECTRONICS

Subject Code : EE-309

M.Code : 57026

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Time : 3 Hrs.

Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Write briefly :
   1. What is TRIAC?
   2. What is holding current?
   3. What do you mean by dv/dt triggering?

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   4. What is load commutation?
   5. What is the need of a chopper?
   6. List the advantages and disadvantages of cycloconverters.
   7. Discuss the need of an Inverter.
   8. What do you mean by PWM control?

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   9. What do you mean by steady state analysis? Discuss.
   10. Explain the importance of phase angle control.

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SECTION-B

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2. Explain the operation of a SCR with the help of its static VI characteristics.
3. Explain the operation of a Single phase half wave controlled rectifier.
4. Describe the working of class D commutation with relevant diagrams.
5. Explain the reduction of harmonics in the inverter output voltage using PWM.
6. Explain the basic circuit and operation of a single-phase cycloconverter.

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SECTION-C

7. Explain:
   1. Series operation of SCR
   2. Parallel operation of SCR
8. Explain:
   1. Class B commutation

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   2. Two quadrant chopper
9. Discuss :
   1. Series inverter
   2. Dual Converter

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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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