GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
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Subject Code:2172402 Date:19/01/2021
Subject Name:Industrial Drives & Control-II
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) List the difference between Active and Passive Load Torque. 03
(b) Explain the four function of Power Electronics Modulator in Electric Motor Drive 04
(c) Define Electric Motor Drive. Draw the detailed block diagram of AC Motor Drive and explain its advantages and disadvantages over DC Motor Drive. 07
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Q.2 (a) List and describe in brief speed control methods for AC motor with block diagram. 03
(b) Compare Scalar Control and Vector Control of Induction Motor drive with necessary diagram of graph. 04
(c) Draw and Explain block diagram of single quadrant closed loop speed control of 3- F IM using 3-F Voltage controller. 07
Q.3 (a) Explain concept of Field Oriented Control. 03
(b) Draw the Speed torque curve of an IM with Unbalanced Stator Voltage and Single Phasing diagram with necessary nomenclature. 04
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(c) Compare FCCSI and LCCSI in terms of motor type, power, Speed range, accuracy, maximum speed, performance, advantage, disadvantage and application. 07
Q.4 (a) Explain concept of Direct Torque Control. 03
(b) Draw the Open Circuit and Closed Circuit Transition of Auto Transformer Starter diagram with necessary nomenclature. 04
(c) Compare Kramer Drive and PWM VSl in terms of motor type, power, Speed range, accuracy, maximum speed, performance, advantage, disadvantage and application. 07
Q.5 (a) Discuss the dynamic modeling of Induction machines in brief giving necessary equations and figures. 03
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(b) List the breaking method of Induction Motor and explain Plugging with necessary diagram. 04
(c) Draw and explain indirect vector control block diagram with open loop flux control 07
Q.6 (a) State why is dynamic model required to derive over steady state model and the necessary assumptions made to derive the dynamic model. 03
(b) List the breaking method of Induction Motor and explain Regenerative braking with necessary diagram. 04
(c) Explain the block diagram of direct vector control with rotor flux orientation. Draw necessary Phasor diagrams. 07
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Q.7 (a) List different converters used for SRM drives and explain any one in brief. 03
(b) List the starting method of Induction Motor and explain any one with necessary diagram. 04
(c) Draw and explain four phase SRM drive using waveform explaining commutation angle generation for one phase. 07
Q.8 (a) Write Technical note on : Sinusoidal PMAC motor drive 03
(b) List the starting method of Induction Motor and explain any one with necessary diagram. 04
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(c) Explain principle of direct torque control scheme using necessary block diagram and switching logic. 07
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