Question Paper: Mechatronics : Question Paper Dec 2012 - Mechanical Engineering (Semester 6) | Mumbai University (MU)
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## Mechatronics - Dec 2012

### Mechanical Engineering (Semester 6)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1 (a) Explain mechatronics system used for domestic cloth washing machine using following components -
i) Mechanical systems
ii) Electrical systems
iii) Computer systems
iv) Sensors and actuators
v) Logic
(5 marks)
1 (b) What are the parameters you will consider for selection of an actuation system for any Physical Industrial System?(5 marks) 1 (c) Determine kp, kv and ka (position, velocity and acceleration errors respectively) for a system with the following transfer function and H(s)=1.
(5 marks)
1 (d) Write short note on Variable Reluctance Stepper Motor.(5 marks) 2 (a) How would you classify the control systems based on the TYPE of system? A unity feedback system has

Determine
i) Type of the system
ii) All error coefficients
iii) Error for ramp input with magnitude 4
(10 marks)
2 (b) Explain the functional block diagram of 8051.(10 marks) 3 (a) Design a pneumatic circuit for work clamping on a milling table, the sequence is: A+,B+,B-,A-.(10 marks) 3 (b) How DAC is specified? Explain interfacing of DAC with block diagram.(10 marks) 4 (a) The unit impulse response of a certain system is found to be e-4t.Determine its transfer function.(10 marks) 4 (b) Construct an electropneumatic circuit with following conditions:
A transport cylinder A should automatically reciprocate to and fro. But another cylinder B is to be actuated by cylinder A just after it starts its forward motion and the cylinder B should retract before cylinder A completes its forward journey after which cylinder A returns.
(10 marks)
5 (a) Explain the factors to be considered for selection of a PLC for a control system. What is the use of ladder logic diagram in PLC programming?(10 marks) 5 (b) Sketch the root locus for the system with
(10 marks)
6 (a) A unity feedback control system has

Draw the Bode Plot. Determine G.M., P.M., ωgc and ωpc. Comment on stability.
(10 marks)
6 (b) Explain interfacing of:
i) Stepper motor
ii) LCD display
(10 marks)
7 (a) A second order system is given by

Find its rise time, peak time, peak overshoot, and settling time if subjected to unit step input. Also calculate expression for its output response.
(10 marks)
7 (b) Compare:
i) Hydraulic and pneumatic systems
ii) Routh and Hurwitz criterions
(10 marks)