Download GTU BE/B.Tech 2019 Summer 7th Sem New 2172402 Industrial Drives And Control Ii Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem New 2172402 Industrial Drives And Control Ii Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2172402 Date:10/05/2019

Subject Name:Industrial Drives & Control-II

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) Compare CSI with VSI giving three points. 03
(b) Explain CSI control for Induction Motor. 04
(c) Describe the analysis of Induction Motor with (1) Unbalanced rotor impedances &
(2) Non-sinusoidal voltage supply.
.
07
Q.2 (a) Explain induction motor drive fed from VSI. 03
(b) Discuss drawback of IM Drive fed from a stepped wave Inverter. 04
(c) What are the similarities between a brushless dc motor and a conventional dc motor?
Why it is known as a brushless dc motor? Enlist its advantages over a conventional
dc motor.
07
OR
(c) Discuss trapezoidal PMAC motor drive for servo application. 07
Q.3 (a) Discuss advantages of stator voltage control method for constant load-torque. 03
(b) Discuss advantages of stator voltage control method for Fan type loads. 04
(c) Discuss IM?s behavior for non-sinusoidal source voltages. 07
OR
Q.3 (a) Draw block diagram of a dc link converter for multi-motor ac drive. 03
(b) Explain the derivation of stator reference frame model. 04
(c) Explain the principle behind the variation of the speed of a 3-? IM by v/f method.
Discuss this for the operation below and above rated frequency.
07
Q.4 (a) Draw the circuit for self-controlled synchronous motor drive using load commutated
thyristor-based inverter.
03
(b) Discuss reference frame theory for induction motor in brief. 04
(c) Draw and explain the thyristor configuration for a stator voltage controlled
reversible-speed Induction Motor Drive. Also draw the speed-torque characteristics
for a reversible induction motor drive.
07
OR
Q.4 (a) Draw the block diagram of feed-forward vector control for IM. 03
(b) Explain the basic principle of DTFC for Voltage fed PWM inverter drives. 04
(c) Explain variable-frequency operation of Induction Motor. Also draw torque
characteristics for this motor at constant volts / Hz.
07
Q.5 (a) Discuss on sensitivity of vector-controlled Induction Motor 03
(b) Discuss on compensation of vector-controlled Induction Motor 04
(c) Explain the concept of direct vector control of Induction Motor Drive. 07
OR
Q.5 (a) Brief the idea about speed control of synchronous motor by vector control method. 03
(b) Discuss dynamic d-q model of Induction Motor. 04
(c) Discuss Principle of indirect vector control with necessary diagram. 07

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