D 04000ME407052001 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Seventh semester B.Tech examinations (S), September 2020

Course Code: ME407
Course Name: MECHATRONICS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 a) Define the following sensor characteristics (1) Time constant (ii) Hysteresis (4)

b) Explain the principle of Hall effect. How a proximity sensor works on the basis (6)

of Hall effect?
2 93) Illustrate the working principle of incremental and absolute rotary encoders. (7)
b) Compare binary and grey code encoders (3)

3 a) With a neat sketch explain the working of diaphragm operated process control (5)

valve
b) Explain the working of any one type of rotary actuator with a neat sketch (5)
4 ஐ Distinguish between pilot operated and direct operated DCVs (3)

b) A double acting cylinder is to be advanced either by operating a push button or (7)
by a foot pedal. Once the cylinder is fully advanced, it is to be retracted to its
initial position. A 3/2-way roller lever valve is to be used to detect the full
extension of the cylinder. Design a pneumatic circuit for this application.
PART ‏تا‎
‎Answer any three full questions, each carries 10 marks.
5 ഒ) Distinguish between bulk micromachining and surface micromachining with (5)
sketches
0) Illustrate the sequence of operations in LIGA process with neat sketches (5)
6 a) Distinguish between wet chemical etching and dry plasma etching. What are the (5)
advantages of dry plasma etching over wet chemical etching
b) Explain the fabrication of MEMS based pressure sensor (5)
7 ഒ) Explain the mechanism of recirculating ball screw with neat sketch. How (10)
backlash can be avoided? What are the advantages of recirculating ball screw?

8 ച What is latching? Draw a simple latched circuit (2)

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