Download GTU BE/B.Tech 2018 Winter 8th Sem Old 181702 Motion Control Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 8th Sem Old 181702 Motion Control Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VIII (OLD) EXAMINATION ? WINTER 2018
Subject Code: 181702 Date: 15/11/2018

Subject Name: Motion Control

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 are the advantages and disadvantages of Step motors? Explain the step
motor performance characteristics in detail.
07
(b) Give the difference between the PLL and PLS systems. Derive the linearized
model for the phase-locked servo systems.
07

Q.2 (a) Explain Bipolar PWM DC motor amplifiers. 07
(b) Explain effect of lead angle in closed-loop control of Step motors. 07
OR
(b) Explain the effect of backlash and dead zone in incremental motion. Draw and
explain the displacement and velocity waveforms for backlash with low and high
friction.
07
07
Q.3 (a) Why Incremental encoders are needs? What are the types of it? Explain each parts
of the Incremental encoder in details.
07
(b) Explain the role of speedup capacitor in active suppression controller. 07
OR
Q.3 (a) Explain the working of position control system using with and without tachometer
feedback.
07
(b) List the selection criteria of DC motor as Incremental motion application. Discuss
at least any two criteria with justification.
07

Q.4 (a) Draw and explain D.C. position control system with potentiometers as error
detector.
07
(b) List out the selection criteria for Stepper motor. Explain step angle resolution and
torque requirements.
07
OR
Q.4 (a) Explain Resolvers and Magnetic pickups as Encoders. 07
(b) What do mean by Optimal control, suboptimal and non-optimal control for IMC?
Explain it with appropriate mathematical justification.
07

Q.5 (a) What is torsional resonance? Explain its effect in three-body structure. Explain
the techniques for minimizing torsional resonance effect in brief.
07
(b)
Enumerate the types of Pulse sources used in motion control. Explain the digital
technique based Rate multiplier type pulse sources in detail.
07
OR

Q.5 (a) Draw and explain bidirectional four-phase single and two phase on logic
sequencer circuit with waveform of output phase for each pulses.
07
(b) Why over drive circuits are required for Step motors? Explain dual voltage control
circuit
07

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