GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019
--- Content provided by FirstRanker.com ---
Subject Code: 2162003 Date: 04/12/2019Subject Name: Control of Electric Drives
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
--- Content provided by FirstRanker.com ---
2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Marks
Q.1 (a) What is power modulator? List out. 03
(b) What is electric drive? Draw block diagram. 04
--- Content provided by FirstRanker.com ---
(c) Describe the choice of electric drives. 07 Q.2 (a) What is steady state stability? 03
(b) Derive fundamental torque equation for drive. 04
(c) Derive the mathematical model of separately excited DC machine. 07
OR
--- Content provided by FirstRanker.com ---
(c) Explain the four quadrant operation of electrical drive with example. 07
Q.3 (a) Explain how to determine the moment of inertia of drive system. 03
(b) In snubber circuit why we use the resistor? 04
(c) Explain various PWM techniques for single phase inverter and three phase inverter. 07
OR
--- Content provided by FirstRanker.com ---
Q.3 (a) List out turn on methods of thyristor. 03
(b) Describe single phase inverter in-brief. 04
(c) Explain in brief various control strategies of a chopper. 07
Q.4 (a) Define the terms: (1) latching current (2) holding current (3) circuit turn-off time. 03
(b) Explain the principle of phase control rectifiers. 04
--- Content provided by FirstRanker.com ---
(c) Explain the series operation of thyristor. 07OR
Q.4 (a) Give the classification of Choppers. 03
(b) How voltage control in single phase bridge inverter. 04
(c) Explain A.C. phase control of TRIAC using DIAC. 07
--- Content provided by FirstRanker.com ---
Q.5 (a) Enlist methods of braking in DC motors. 03
(b) Explain transient analysis in DC motor drives. 04
(c) Give the comparison between various methods of braking in dc motors. 07
OR
Q.5 (a) Explain any one speed control method of 3-phase induction motor in detail. 03
--- Content provided by FirstRanker.com ---
(b) Explain with necessary diagram 3-point starter using in dc motor. 04(c) Explain the speed control method of 3-phase induction motor. 07
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University