EDC Important Questions for Univesity Exam Nov/Dec 2016

EDC-Important Questions for Univesity Exam-Nov/Dec 2016

EE6365 Electrical Drives & control. Important Questions for Univesity Exam Nov/Dec 2016

EE6365:  Electrical Drives & control.

EDC Important Questions for Univesity Exam Nov/Dec 2016

EE6365:  Electrical Drives & control.

Model Exam, Oct 2016

Time: 3 hours                                                     Semester: III                                                    Total marks 100

Part – A (10 x 2 =20)

• Define cooling time constant
• Draw the block diagram of electrical drive
• Mention any four factors influencing the choice of electric drives
• What is the basic difference between a 3point starter and a four point starter
• What are the advantages of three phase slip ring induction motor
• What is a dc chopper?
• Mention the advantages of slip power recovery scheme
• Define duty cycle of a dc motor
• What are the main features of v/f control
• List the applications of a.c. regulator based variable speed induction motor

Part – B (65Marks)

• a) (i)         Discuss in detail the factors influencing the choice of electric drive.                         (6)

(ii)        Explain the method of estimating equivalent continuous power rating of a motor for                                  short time load applications                                                                                        (7)

(Or)

1. a)         (i)         Derive the expression for a thermal model of motor for cooling curve.                      (8)

(ii)        Explain the classes of duty of motor.                                                                                      (5)

• a) Derive the different methods of braking of dc motor with a neat sketch.                            (13)

(Or)

1. b)         (i)         Draw and explain the speed characteristics of 3 phase induction motor                     (5)

(ii)        Explain the principle of operation of capacitor start and run single phase induction                                     motor                                                                                                                          (8)

• a) Explain the three point starter operation with neat sketch                                                    (13)

(Or)

1. b)         Sate and explain the various starting methods of squirrel cage induction motor                  (13)

• a) (i)         Sate and explain various methods of controlling speed of d. c. shunt motor             (7)

(ii)        Explain in detail the single phase semiconverter speed control for D.C. drive for                            separately excited motor                                                                                              (6)

(Or)

1. b) Discuss the Ward-leonard speed control system with a neat circuit diagram. Also write the                        advantages and disadvantages                                                                                              (13)

• a) Sate and explain the various schemes adopted for speed control of induction motor using voltages source inverter                                                                                                            (13

(Or)

1. b) What is meant by slip power recovery scheme? Explain with necessary diagram?              (13)

Part – c (15Marks)

• Devive the torque equation of three phase induction motor and derive torque slip characteristics

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