23053 - SPECIAL ELECTRICAL MACHINES - IMPORTANT QUESTIONS

DIPLOMA IN ELECTRICAL AND ELECTRONICS ENGINEERING

SUBJECT CODE      : 23053

SEMESTER               : V SEMESTER

SUBJECT TITLE      : SPECIAL ELECTRICAL MACHINES

STAFF-IN-CHARGE: N.SURESH KUMAR

IMPORTANT QUESTIONS

UNIT-I

PART-A

1.     State Any Two Properties Of Synchronous Reluctance Motors-Oct 2013

2.     Write Down Torque Equation Of PMSM-Oct 2013

3.     List Any One Application Of SyRM-Oct 2013

4.     Give EMF Equation Of PMSM-Oct 2013

5.     Write down the torque of permanent magnet synchronous motor.-April 2014

6.     How electronic circuit control the proper operation of permanent magnet synchronous motor. -April 2014

7.     Write any two application of PMSM. -April 2014

8.     Write one disadvantage of synchronous reluctance motor. -April 2014

9.     State the difference between permanent magnet motor and pure reluctance motor?

10.            What type of supply is given for permanent magnet synchronous motor?

11.            Give the EMF equation of permanent magnet synchronous motor.

12.            Mention any two advantages of pure reluctance motor.

PART-B

1.     Derive From The First Principles The EMF Equation Of PMSM (12) -Oct 2013

2.     Explain How Static Torque Is Produced In SyRM(12) -Oct 2013

3.     Draw and explain the speed torque characteristics of permanent magnet synchronous motor. (12) -April 2014

4.     Explain the construction and operation of synchronous motor. (12) -April 2014

5.     With neat sketch explain the constructional features and operating principle of permanent magnet synchronous reluctance motor.(12)

6.     Draw and explain the phasor diagram of permanent magnet synchronous motor. (12)

UNIT-II

PART-A

1.     What Is The Principle Of SRM? -Oct 2013

2.     List Any Two Applications Of SRM-Oct 2013

3.     Mention Any Two Drawbacks Of SRM-Oct 2013

4.     Draw Torque-Speed Characteristics Of SRM-Oct 2013

5.     What do you mean by switch reluctance motor? -April 2014

6.     Write any control method for switched reluctance motor. -April 2014

7.     Mention any two disadvantages of position sensor in switched reluctance motor. -April 2014

8.     Write any two application of switched reluctance motor. -April 2014

9.     State any two advantages of switched reluctance motor.

10.                        Give the relationship between fundamental switching frequency and speed of SRM.

PART-B

1.     Explain How Static Torque Produced In SRM (12) -Oct 2013

2.     Explain In Details Sensorless Operation Of SRM (12) -Oct 2013- April 2014

3.     Draw and explain the torque speed characteristics of switched reluctance motor. (12) -April 2014

4.     With neat sketch explain the construction and principle of operation of SRM. (12)

5.     Draw and explain SRM drive circuits for 3 phase SRM. (12)

UNIT-III

PART-A

1.     What Is Hybrid Stepper Motor?-Oct 2013

2.     Define Holding Torque-Oct 2013

3.     Draw The Dynamic Characteristics Of Stepper Motor-Oct 2013

4.     Mention The Different Types Of Stepper Motor-Oct 2013

5.     Mention the name of the two type of variable reluctance stepper motor. -April 2014

6.      Define step angle of stepper motor. -April 2014

7.     What are the two characteristics of stepper motor? -April 2014

8.      Define holding torque of stepper motor. -April 2014

9.     Mention few application of stepper motor.

10.                        State the principle of stepper motor.

11.                        List any two applications of stepper motor.

PART-B

1.     Explain The Construction And Operation Of Stepper Motor (12) -Oct 2013

2.     Draw The Block Diagram Of Closed Loop Control Of Stepper Motor And Explain (12) -Oct 2013

3.     Explain the working of a hybrid stepper motors. (12) -April 2014

4.     Draw the dynamic characteristics of stepper motor and explain. (12) -April 2014

5.     Explain at least any five applications of stepper motor. (12)

UNIT-IV

PART-A

1.     Give The EMF Equation Of Permanent Magnet BLDC Motor-Oct 2013

2.     Draw The BH Curve Of Permanent Magnet-Oct 2013

3.     Mention Any Two Applications Of Permanent Magnet BLDC Motor-Oct 2013

4.     What Are The Salient Features Of BLDC Motor? -Oct 2013

5.     What are the types of permanent magnet brushless motor? -April 2014

6.     Write down the EMF equation of brushless permanent magnet. -April 2014

7.     Draw the torque speed characteristics and indicate rated torque and peak torque of permanent magnet brushless DC motor. -April 2014

8.     Compare permanent magnet brushless DC motor with conventional DC motor. -April 2014

9.     Draw the demagnetization characteristic curve of permanent magnet.

10.                        What are the disadvantages of brushless DC motor as compared to - PMDC commutator motor?

11.                        Name the materials used for permanent magnet.

12.                        Write down the torque equation of Brushless D.C motor.

PART-B

1.     With neat sketches and waveforms explain the operation of Brushless DC motor with 180° and 120° magnet arcs. (12) -Oct 2013

2.     Draw the schematic of controller for brushless D.C motor and explain its (12) -Oct 2013

3.     Derive the EMF equation of permanent magnet brushless motor. (12) -April 2014

4.     With necessary sketch explain the operation of operation of brushless DC motor with 120  magnet arc. (12) -April 2014

5.     Draw the magnetic equivalent circuit of PMBLDC motor and Discuss on various parameters there in (12)

6.      (1) Bring about EMF and Torque equation of permanent magnet brushless D.C motor. (6) (2) Draw and explain Torque speed characteristics of brushless DC motor.(6)

UNIT-V

PART-A

1.     Which Type Of Supply Used In Hysteresis Motor?-Oct 2013

2.     Mention The Applications Of AC Series Motor. -Oct 2013

3.     State The Principle Of Linear Motor-Oct 2013

4.     State The Principle Of PMDC Motor-Oct 2013

5.     At synchronous speed what type of torque is present in hysteresis motor? -April 2014

6.     Write two applications Ac series motor. -April 2014

7.     Give the expression for synchronous speed of linear induction motor. -April 2014

8.     State two advantage of permanent magnet AC motor. -April 2014

9.     Where is linear motor used?

10.            What is the type of supply used in permanent magnet A.C. motor?

11.            What is linear motor?

12.            Give an application of permanent magnet D.C motor.

13.                                                                                                                     State the principle of hysteresis motor?

PART-B

1.     Briefly explain the principle of operation and characteristics of Hysteresis motor. Mention its applications..(12) - Oct 2013 -April 2014

2.     Construction And Operation Of AC Series Motor (12) -Oct 2013

3.     Draw and explain the torque current and torque  speed characteristics of permanent magnet DC motor. Also write the advantage of permanent magnet DC motor. (12) -April 2014

4.     Write short notes on 1. Permanent magnet AC motor. 2. Linear motor. (12)

5.     Write short notes on (12) 1. Linear motor. 2. A.C series motor          (12)

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