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Mechatronics Question Paper - Dec 18 - Electronics And Telecomm (Semester 5) - Pune University (PU)
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Mechatronics - Dec 18
Electronics And Telecomm (Semester 5)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a.
Write a Short note on servomechanism.
(6 marks)
00
1.b.
If the spring tranducer deflects 0.075 m when a force of 15KN is applied, find the input force for a displacement of 0.1 m.
(4 marks)
00
1.c.
With the help of a suitable diagram explain the working principle of unbalanced vane pump.
(5 marks)
00
1.d.
Describe the working of epicyclical gear train with the help of neat diagram
(5 marks)
00
2.a.
A potentiator which is used to measure the rotatinal position of a shaft has 850 turns of wire. the input range is from $-120^{0}$ to $160^{0}$ . The output range is from 0 to 12V . Determine
(6 marks)
00
i) Span of potentiometer
ii) Sensitivity
iii) Average resolution in volts
2.b.
Explain the working of absolute encoder with a neat diagram.
(6 marks)
00
2.c.
Determine the force needed to a piston of 2 cm radius in order to result a force of 6000N at the working piston of radius 6cm. Calculate the hydraulic pressure in bar.
(4 marks)
00
1.d.
Define the following terms with respect to hydraulic pump:
(4 marks)
00
i) Volumetric efficiency
ii) Power efficiency
3.a.
Explain the working of dyanmic compressor with a neat sketch.
(6 marks)
00
3.b.
Demonstrate the working of the non- relieving pressure regulator.
(6 marks)
00
3.c.
What is the difference between free air and standard air?
(4 marks)
00
OR
4.a.
With a suitable diagram explain how double axcting piston compressor delivers air twice than single acting piston compressor.
(8 marks)
00
4.b.
A pneumatic cylinder is required to move a 750N load 150mm in 0.5s . What is the output power?
(4 marks)
00
4.c.
List two advantages and two disadvantages of pneumatic system over hydraulic system.
(5 marks)
00
5.a.
Explain the following specifications of stepper motor.
(4 marks)
00
i) phase
ii) Step angle
5.b.
WIth a suitable sketch, explain the working of single acting cylinder.
(8 marks)
00
5.c.
Explain the input pulse rate if the stepper motor has $10^{0}$ per step and rotating at 300 rpm.
(6 marks)
00
6.b.
Explain the construction and working of 5/2 - way pilot operated valve. Draw its symbol
(8 marks)
00
6.c.
How relay is used as an electromagnetical switch? Explain with suitable sketch.
(6 marks)
00
7.a.
A train is subjected to lateral forces when it passes horizontal curves. This causes severe discomfort to the passengers. Devise a solutio to tackle this problem.
(8 marks)
00
7.b.
Design an antilock brake system to prevent the wheels of motor vehicle from locking while braking.
(8 marks)
00
8.a.
List six points of comparison between NC, CNC, and conventional system.
(12 marks)
00
8.b.
Explain the need of following sensors in engine management system.
(4 marks)
00
i) Knock sensor
ii) Mass airflow sensor.
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