Download GTU BE/B.Tech 2019 Summer 6th Sem New 2162003 Control Of Electric Drives Question Paper

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Subject Code:2162003

GUJARAT TECHNOLOGICAL UNIVERSITY

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SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019

Subject Name:Control of Electric Drives

Time:10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. Discuss the characteristics of SCR with necessary diagrams. [03]
2. Enlist the advantages of electrical drives. [04]

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3. Classify different types of Drives. Also Discuss the closed loop control of electrical drives in general. [07]

Q.2

1. Compare three point starter and four point starter. [03]
2. Discuss the nature and classification of load torques. [04]
3. Illustrate the four quadrant operation of electrical drive for hoist load. [07]

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OR

1. What are the control strategies for chopper? Explain in brief. [07]

Q.3

1. An electrical motor has a rotational load directly connected to its shaft. The torque speed characteristics of motor and load are:
   T=15-0.5?,
   

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   T_L = 0.5 ?²
   Find the operating speed ?_o, and Check the steady state stability. [03]
2. Discuss turn on methods of SCR. [04]
3. Write a short note on DIAC and TRIAC. [07]

OR

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1. Explain the working of type B chopper. [07]

Q.4

1. Discuss various performance parameters of inverter. [03]
2. Which type of chopper is suitable to drive a lift (elevator)? Illustrate the working of the same chopper. [04]
3. Explain regenerative braking of dc motor in detail. [07]

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OR

1. List the advantages of PWM Techniques. [03]
2. Explain the working of single phase inverter with RL load. [04]
3. Discuss the operation of three phase full wave rectifier with necessary waveforms. [07]

Q.5

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1. Discuss operation of IM under Non-Sinusoidal voltage supply. [03]
2. Discuss about stepper motor drives. [04]
3. Explain the working of single phase inverter with RLE Load. [07]

OR

1. Give the disadvantages of phase controlled rectifier fed DC motor drive. [03]

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2. List out Starters used for induction Motor? Explain any one of them. [04]
3. Illustrate the working of linear induction motor. [07]

Date:10/05/2019

Total Marks: 70

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