GTU BE 2020 Summer Question Papers || Gujarat Technological University
Subject Name: CONTROL OF ELECTRICAL DRIVES
Time: 10:30 AM TO 01:00 PM Total Marks: 70
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI EXAMINATION — SUMMER 2020
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Subject Code: 2160913 Date:04/11/2020Subject Name: CONTROL OF ELECTRICAL DRIVES
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | |
| Q.1 (a) Define the Electrical drives system with appropriate diagram. | 03 |
| (b) Explain four quadrant operation of electrical drives. | 04 |
| (c) Identify the characteristics of load torque for different application. | 07 |
| Q.2 (a) List the different speed control technique for DC series control. | 03 |
| (b) Discuss the steady state analysis of electrical drive. Derive limit of steady state condition. | 04 |
| (c) Explain the dynamic model of the dc motor drive. | 07 |
| OR | |
| (c) A 220V,1500 rpm, 10 a separately excited dc motor is fed from 1 phase fully controlled rectifier with a source voltage 230 volt 50 hz and Ra = 2 ohm conduction can be assumed to be continuous. calculate firing angle at half rated torque and 500 rpm. | 07 |
| Q.3 (a) Compare FOC and DTC drives. | 03 |
| (b) Explain the closed loop speed control technique for DC motor. | 04 |
| (c) Explain the motoring-and regenerative operation of dc series motor connected with diode and transistor based dc chopper circuits. | 07 |
| OR | |
| Q.3 (a) Define the principle of vector control. | 03 |
| (b) Explain the Clarke transformation technique. | 04 |
| (c) Explain dynamics of motor load coupled with transmission gear system. | 07 |
| Q.4 (a) List the different effects of harmonics on operation of induction motor. | 03 |
| (b) Compare the CSI and VSI types inverters. | 04 |
| (c) Apply V/F control of induction motor drives | 07 |
| OR | |
| Q.4 (a) List advantages of V/F control over other control technique | 03 |
| (b) Compare scalar control and vector control. | 04 |
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| Q.5 (a) Discriminate the constant torque and constant power region from torque speed characteristics of 3 phase induction motor. | 03 |
| (b) Discuss the types of servo motor drive | 04 |
| (c) Explain direct torque control of induction motor drive | 07 |
| OR | |
| Q.5 (a) List out the different types of references frame used in induction motor modeling. | 03 |
| (b) Explain the different electrical breaking system. | 04 |
| (c) Utilize solar powered drive for solar water pump application. | 07 |
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