Download GTU BE/B.Tech 2019 Summer 3rd Sem Old 133402 Electrical Drives And Controls Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 3rd Sem Old 133402 Electrical Drives And Controls Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? III(OLD) EXAMINATION ? SUMMER 2019
Subject Code: 133402 Date: 04/06/2019

Subject Name: Electrical Drives And Controls

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) What is an electrical drive? Draw the block diagram of electrical drives and
explain it. Also discuss it's advantages?
07
(b) Explain motors used in steel rolling mills, cranes & hoists, coal & mining
industry.
07

Q.2 (a) What are the different electrical braking methods used in electrical drives.
Explain the method applied to dc motor?
07
(b) Explain types of DC motors with equation. 07
OR
(b) Calculate the value of torque developed by the armature of a 4 pole motor
having 774 conductors, two paths in parallel, 24mWb flux per pole, when
loaded the total armature current is 50 A.
07

Q.3 (a) Derive torque equation of Induction motor, starting torque. Also explain the
condition for maximum torque.
07
(b) Explain shaded pole induction motor with neat diagram. 07
OR
Q.3 (a) Explain the starting method of slip ring induction motor? 07
(b) What are the needs of starter? Explain the 3-point starter with neat
diagram?
07

Q.4 (a) Explain the chopper control of separately excited DC motor? 07
(b) Explain plugging and regenerative braking for induction motor. 07
OR
Q.4 (a) Describe the ward-Leonard speed control method? 07
(b) Explain voltage/frequency speed control method for induction motor. 07

Q.5 (a) Compare half controlled & full controlled rectifier. 07
(b) Compare VSI and CSI. 07
OR

Q.5 (a) Explain Static slip power recovery scheme. 07
(b) Explain the method of control of three phase induction motor by
(1) Stator voltage control (2) frequency control
07

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