# Download GTU B.Tech 2020 Summer 6th Sem 2160913 Control Of Electrical Drives Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 6th Sem 2160913 Control Of Electrical Drives Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? VI EXAMINATION ? SUMMER 2020
Subject Code: 2160913 Date:04/11/2020
Subject Name: CONTROL OF ELECTRICAL DRIVES
Time: 10:30 AM TO 01:00 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) Define the Electrical drives system with appropriate diagram.
03

(b) Explain four quadrant operation of electrical
04
drives.

(c) Identify the characteristics of load torque for different application.
07

Q.2 (a) List the different speed control technique for DC series control.
03

(b) Discuss the steady state analysis of electrical drive. Derive limit of
04

(c) Explain the dynamic model of the dc motor drive.
07

OR

(c) A 220 V ,1500 rpm , 10 a separately excited dc motor is fed from 1
07
phase fully controlled rectifier with a source voltage 230 volt 50
hz and Ra = 2 ohm conduction can be assumed to be continuous.
calculate firing angle at half rated torque and 500 rpm.
Q.3 (a) Compare FOC and DTC drives.
03

(b) Explain the closed loop speed control technique for DC motor.
04

(c) Explain the motoring and regenerative operation of dc series motor
07
connected with diode and transistor based dc chopper circuits.

OR

Q.3 (a) Define the principle of vector control.
03

(b) Explain the Clarke transformation technique.
04

(c) Explain dynamics of motor load coupled with transmission gear
07
system.
Q.4 (a) List the different effects of harmonics on operation of induction
03
motor.

(b) Compare the CSI and VSI types inverters.
04

(c) Apply V / F control of induction motor drives
07

OR

Q.4 (a) List advantages of V/F control over other control technique
03

(b) Compare scalar control and vector control.
04
1

(c) Apply the slip recovery scheme for speed controlling of induction
07
motor drive.
Q.5 (a) Discriminate the constant torque and constant power region from
03
torque speed characteristics of 3 phase induction motor.

(b) Discuss the types of servo motor drive
04

(c) Explain direct torque control of induction motor drive
07

OR
Q.5 (a) List out the different types of references frame used in induction
03
motor modeling.
(b) Explain the different electrical breaking system.
04
(c) Utilize solar powered drive for solar water pump application.
07

2