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Reg No.:_. Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SEVENTH SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019

Course Code: ME407
Course Name: MECHATRONICS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 9) Compare the working of resolver and synchro. (6)
b) Suggest two applications of Hall effect sensor in mechatronic systems. (2)
c) Describe the terms hysteresis error and non-linearity error. (2)
2 2) Differentiate between absolute and incremental encoders (2)

b) Explain the working of an optical absolute encoder. How the number of tracks (5)
and sectors of absolute encoder is related to the resolution of the encoder?

€) Draw the encoder wheel layout of a grey coded absolute encoder with 45degree (3)

resolution
3 a) Explain the working of a double acting hydraulic actuator (4)
b) Why cushioning is necessary for pneumatic actuators (2)
c) Explain how cushioning is achieved in pneumatic actuators with a sketch. (4)
4 ஐ What is a 4/3 way valve? When is it used in place of 4/2 way valves (4)

b) Design a hydraulic circuit to operate a winch fitted with a hydraulic motor. The (6)
motor should be run clockwise, counter clockwise and stopped. Use a manually

operated valve.

PART ‏تا‎
‎Answer any three full questions, each carries 10 marks.
5 ஐ) List any 2 controlling factors in wet etching. (2)
b) Differentiate between immersion etching and spray etching. (2)
c) Describe the dry etching process in MEMS micromachining (6)
6 Explain the LIGA process in MEMS fabrication with neat sketches. (10)
7 ഒ) Mention any 2 functions of guide ways in machine tools. (2)
b) Comment on the stick-slip phenomenon associated with friction guide ways. (2)
c) Explain the working of LM guide ways (6)
8 Develop a PLC ladder program for the following sequence: Start a motor with (10)

push switch, and then after a delay of 90s, starta pump. When the motor is

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