Download GTU BE/B.Tech 2019 Winter 6th Sem New 2162003 Control Of Electric Drives Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2162003 Control Of Electric Drives Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2162003 Date: 04/12/2019

Subject Name: Control of Electric Drives

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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
(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
(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
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
(c) Explain the series operation of thyristor. 07
OR
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
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
(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

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