Assignment-III -Subject-Electrical Machines

Assignment-III

Subject_ Electrical Machines

SET-A

1) What is drives? Explain in details with suitable block diagram. 

2) Compare AC drive and DC drive. 

3) Explain different selection criteria of electrical drives 

4) Explain operation of three phase full controlled converter fed separately excited DC motor.

5) What is chopper drive? Explain Two Quadrant Chopper Drive with suitable diagram? 

6) Explain different modes of operation of 4 quadrant drive. 

7) Explain V/f method of speed control of 3 phase induction motor. Why the ratio V/f is to be kept constant? 

8)Explain construction detail and V-I characteristics of DIAC.

9) Explain Construction details and draw output and Transfer characteristics of IGBT.

10)Explain construction detail, application and V-I characteristics of SCR.

                              Assignment-III

Subject_ Electrical Machines

SET-B

1)What are different applications of electric drive. State advantages of Electrical drives. 

2) What are different classification of drive? Compare individual drive and group drive. 

3) Explain operation of Single-phase full controlled converter DC drive with suitable diagram and waveform? 

4) What is chopper drive?Write its application and various advantages. 

5)Explain four Quadrant Chopper Drive with suitable diagram? 

6)Explain following speed control methods of 3 phase induction motor : a) Stator voltage control method b) V/f control method c) frequency control method .

7)Explain construction detail and V-I characteristics of TRIAC.

8)Explain and draw output and Transfer characteristics of MOSFET and IGBT.

9)Based on application and construction distinguish SCR and TRIAC.