GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019
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Subject Code: 2160913 Date: 12/12/2019
Subject Name: Control of Electrical Drives
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 (a) What is an Electric Drive? Give the classification of Electric Drive. | 03 |
| (b) Draw the basic block diagram of Electric Drive and Explain the function of any three blocks. | 04 |
| (c) Explain nature and classification of load torques. | 07 |
| Q.2 (a) Explain the method to determine the moment of Inertia (J). | 03 |
| (b) Explain drive parameters for the load with rotational motion. | 04 |
| (c) Discuss the four quadrant operation of electrical drive for hoist load. | 07 |
| OR | |
| (c) Explain how static rotor resistance control is achieved during starting of induction motor. | 07 |
| Q.3 (a) A 200V DC series motor has armature and field resistance of 0.2 O and 0.1O respectively. It takes a current of 20 A from supply while running at 1300 rpm. If an external resistance of 2 O is added in series with the motor, calculate the new speed. Assume load torque remains constant. | 03 |
| (b) Draw and explain the dynamic model of DC motor. | 04 |
| (c) Discuss the Single ‘phase fully controlled converter for continuous conduction mode with diagram and waveforms. Also derive the equation for speed in terms of firing angle. | 07 |
| OR | |
| Q.3 (a) A 200V, 875 rpm, 150 A separately excited DC motor has an armature resistance of 0.06 O. It is fed from a single phase fully controlled rectifier with an AC source of 220 V, 50 Hz. Calculate the firing angle for rated motor torque and 750 rpm. Assume continuous conduction mode. | 03 |
| (b) Compare DC Drive with AC Drive. | 04 |
| (c) Discuss chopper controlled Separately excited DC motor drive operation for motoring mode. | 07 |
| Q.4 (a) Compare CSI fed induction motor drive with VSI fed induction motor drive. | 03 |
| (b) Discuss the effect of harmonics on induction motor. | 04 |
| (c) Explain closed loop slip control scheme for induction motor. | 07 |
| OR | |
| Q.4 (a) Explain operation of doubly fed induction machine in sub synchronous mode. | 03 |
| (b) What are the advantages of V/f control over other scalar control techniques? | 04 |
| (c) Explain constant volts/hertz control method for induction motor drives. | 07 |
| Q.5 (a) Write advantages of BLDC motor over conventional DC motor. | 03 |
| (b) Compare Direct torque control method and field oriented control method. | 04 |
| (c) Explain the d-q model of induction motor. | 07 |
| OR | |
| Q.5 (a) State application of synchronous motor drive. | 03 |
| (b) State the advantages and disadvantages of electric traction drives. | 04 |
| (c) Explain basic structure of solar and battery operated drives. | 07 |
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