Download GTU BE/B.Tech 2019 Summer 3rd Sem New 2133402 Electrical Drives And Controls Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 3rd Sem New 2133402 Electrical Drives And Controls Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2133402 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.

Marks

Q.1 (a)
What are the factors influencing the choice of electrical drives?
03
(b)
What is a Group Electric Drive (Shaft Drive)? What are the advantages and
disadvantages of Group drive (Shaft drive)?
04
(c)
Compare A.C and D.C drives.
07

Q.2 (a) Discuss in detail the determination of power rating of motors. 03
(b)
Draw and explain Torque-Speed characteristic of DC shunt motor
04
(c)
Discuss different methods of electrical braking of DC Machines
07
OR
(c)
Draw and explain torque/speed curve of 3-phase induction motor
07
Q.3 (a)
Explain characteristics of DC shunt motor.
03
(b)
Draw and explain Torque-Speed characteristic of DC series motor
04
(c)
What is the need of starter in DC motor. Explain 3-point starter with diagram.
07
OR
Q.3 (a)
Write a note on construction of 3-phase induction motor.
03
(b)
Explain rotor rheostat control of slip-ring induction motor.
04
(c)
A 230 V, 10 hp d.c. shunt motor delivers power to a load at 1200 r/min. The armature
current drawn by the motor is 200 A. The armature circuit resistance of the motor is
0.2 ohms and the field resistance is 115 ohms. If the rotational losses are 500W, what
is the value of the load torque?
07
Q.4 (a)
Draw and explain rotor rheostat control of slip-ring induction motor in brief
03
(b)
Explain how the speed of a DC Shunt Motor can be varied both above and below the
speed at which it runs with full field current
04
(c)
Discuss the Ward-Leonard speed control system with a neat circuit diagram. Also
mention its advantages and disadvantages
07
OR
Q.4 (a)
Why DC series motor should not be started without loaded conditions?
03
(b)
Explain working of Star-Delta starter in brief.
04
(c)
Explain with neat sketch Type-A & Type-B chopper control method of speed control
of DC Motors
07
Q.5 (a)
Explain the working of Conventional Scherbius system with neat circuit diagram.
03
(b)
Write down the merits and demerits of AC Drives.
04
(c)
Explain the V/f control method of AC drive with neat sketches
07
OR

Q.5 (a)
Explain the working of Conventional Kramer system with neat circuit diagram.
03
(b)
Draw the power circuit arrangement of three phase variable frequency inverter for
the speed control of three phase induction motor and explain its working
04
(c)
Explain in detail about the various methods of solid state speed control techniques
by using inverters
07

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