GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
Subject Code: 2172402 Date: 23/11/2019
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Subject Name: Industrial Drives & Control-II
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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- (a) Define Power Electronics. Explain advantage and disadvantage of Power Electronics. (03)
(b) Explain the four functions 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) - (a) List and describe in brief speed control methods for AC motor. (03)
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(b) Explain why the control of a three-phase induction motor is more difficult than D.C. motors. (04)
(c) Draw and Explain block diagram of single quadrant closed loop speed control of 3-F IM using 3-F Voltage controller. (07)
OR
(c) Draw and Explain block diagram of four quadrant closed loop speed control of 3-F IM using 3-F Voltage controller. (07) - (a) Explain concept of Field Oriented Control. (03)
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(b) Draw the Speed torque curve of an IM with Unbalanced Stator Voltage and Single Phasing diagram with necessary nomenclature. (04)
(c) Compare FCCSI and LCCSI in terms of motor type, power, Speed range, accuracy, maximum speed, performance, advantage, disadvantage and application. (07)
OR
(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)--- Content provided by FirstRanker.com ---
(c) Compare Kramer Drive and PWM VSI in terms of motor type, power, Speed range, accuracy, maximum speed, performance, advantage, disadvantage and application. (07) - (a) Discuss the dynamic modeling of Induction machines in brief giving necessary equations and figures. (03)
(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)
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(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 with necessary diagram. (04)
(c) Explain the block diagram of direct vector control with rotor flux orientation. Draw necessary Phasor diagrams. (07) - (a) List different converters for SRM drives. (03)
(b) List the starting method of Induction Motor and explain star delta starter with necessary diagram. (04)--- Content provided by FirstRanker.com ---
(c) Draw and explain four phase SRM drive using waveform explaining commutation angle generation for one phase. (07)
OR
(a) Write Technical note on : Sinusoidal PMAC motor drive (03)
(b) List the starting method of Induction Motor and explain autotransformer starter with necessary diagram. (04)
(c) Explain principle of direct torque control scheme using necessary block diagram and switching logic. (07)
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