Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2160910 Electrical Drives Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2160910 Date:04/12/2018
Subject Name:Electrical 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.
Q.1 (a) Give advantages of PWM inverter. 03
(b) What is meant by steady state stability of an electrical drive? Explain
and state the two conditions for and electrical drive to have steady state
stability from explanations
.
04
(c) Explain the Dynamic model of DC motor Drive. 07
Q.2 (a) Explain any one speed control method of 3-Phase Induction motor. 03
(b) Explain Synchronous motor drive with block diagram in brief. 04
(c) Explain single phase full wave bridge type controlled converter with
RLE load and with freewheeling diode. Also draw all the necessary
waveforms and derive equations of output DC voltage and current.
07
OR
(c) Explain the four quadrant operation of chopper ( type-E) 07
Q.3 (a) Give classification of AC to DC Converters. 03
(b) What are the factor affecting the selection of electrical drives. 04
(c) Explain d-q model of Induction motor 07
OR
Q.3 (a) Explain type A chopper circuit. 03
(b) Draw block diagram of electric drive and give function of each block. 04
(c) Explain the principle of vector control model for induction motor
drives.
07
Q.4 (a) What is self tuning control? Explain 03
(b) What is sliding mode control? State its advantages. 04
(c) Explain the torque equation for D.C motor. 07
OR
Q.4 (a) Draw torque-speed characteristics of different DC motors. 03
(b) Explain the field control and armature control methods of speed control
for DC shunt motor.
04
(c) Explain model referencing adaptive control. 07
Q.5 (a) State the advantages of three phase rectifier over single phase rectifier
for drive system.
03
(b) What is load equalization? Why is it required? 04
(c) Explain basic structure of solar and battery powered drives. 07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2160910 Date:04/12/2018
Subject Name:Electrical 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.
Q.1 (a) Give advantages of PWM inverter. 03
(b) What is meant by steady state stability of an electrical drive? Explain
and state the two conditions for and electrical drive to have steady state
stability from explanations
.
04
(c) Explain the Dynamic model of DC motor Drive. 07
Q.2 (a) Explain any one speed control method of 3-Phase Induction motor. 03
(b) Explain Synchronous motor drive with block diagram in brief. 04
(c) Explain single phase full wave bridge type controlled converter with
RLE load and with freewheeling diode. Also draw all the necessary
waveforms and derive equations of output DC voltage and current.
07
OR
(c) Explain the four quadrant operation of chopper ( type-E) 07
Q.3 (a) Give classification of AC to DC Converters. 03
(b) What are the factor affecting the selection of electrical drives. 04
(c) Explain d-q model of Induction motor 07
OR
Q.3 (a) Explain type A chopper circuit. 03
(b) Draw block diagram of electric drive and give function of each block. 04
(c) Explain the principle of vector control model for induction motor
drives.
07
Q.4 (a) What is self tuning control? Explain 03
(b) What is sliding mode control? State its advantages. 04
(c) Explain the torque equation for D.C motor. 07
OR
Q.4 (a) Draw torque-speed characteristics of different DC motors. 03
(b) Explain the field control and armature control methods of speed control
for DC shunt motor.
04
(c) Explain model referencing adaptive control. 07
Q.5 (a) State the advantages of three phase rectifier over single phase rectifier
for drive system.
03
(b) What is load equalization? Why is it required? 04
(c) Explain basic structure of solar and battery powered drives. 07
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2
OR
Q.5 (a) State the advantages of electric traction drive. 03
(b) Derive fundamental torque equation. 04
(c) Explain the servo motor drive requirement, control and
implementation.
07
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This post was last modified on 20 February 2020