MU Mechatronics - December 2013 Exam Question Paper

MU Mechanical Engineering (Semester 6)
Mechatronics
December 2013

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Differentiate between microprocessor and microcontroller.

5 M

1 (b) How steady state error of a control system is determined? How it can be reduced?

5 M

1 (c) Obtain the transfer function of the system defined by the following state-space equations:

$\begin{bmatrix}x_1\\x_2 \\x_3 \end{bmatrix} = \begin{bmatrix} 0 &1 &0 \\0 &0 &1 \\-5 &-25 &-5 \end{bmatrix} \begin{bmatrix}x_1\\x_2 \\x_3 \end{bmatrix}+ \begin{bmatrix} 0\\25 \\-120 \end{bmatrix} u \\ y= \begin{bmatrix} 1 & 0 & 0 \end{bmatrix} \begin{bmatrix} x_1\\x_2 \\x_3 \end{bmatrix}$

5 M

1 (d) Write short note on pneumatic actuator.

5 M

2 (a) Explain the architecture of 8051 microcontroller with neat sketch.

10 M

2 (b) For a system,

$G(s) h(s) = \dfrac {k}{s^2 (s+2)(s+3) }.$ Find the value of k to limit steady state error to 10 when input to system is

$\left \{ 1+10t + \dfrac {40}{2} t^2 \right \}$

10 M

3 (a) Two double acting pneumatic cylinders A and B are selected for an industrial application. The sequence of movement for cylinder is as indicated below. A+B+, (AB)- Draw pneumatic circuit for the above sequence of operation.

10 M

3 (b) Draw Bode plot for a unity feedback system with

$G(S) H(S) = \dfrac {3 (s+1) (s+6) }{s^2 (s^2 = 18 s + 400)}$ Comment on G.M, P.M, and stability.

10 M

4 (a) Describe the Architecture of PLC with block diagram with suitable industrial applications.

4 M

4 (b) Sketch the complete root locus for the system having,

$G(S) H(S) = \dfrac {K} {s(s+1) (s+2)(s+3)}$

8 M

4 (c) Consider the liquid-level system shown in the fig. 1. In the system Qt is steady-state flow rate, H₁ and H₂ are steady-state heads. h₁ and h₂ small deviation of head from its steady state value q and q₂ are small deviations of inflow and outlflow rate from its steady values. Obtain the transfer function of the system.

8 M

5 (a) Two double acting hydraulic cylinders A, B are selected for an industrial application. The sequence of movement for cylinder is as indicated below-
Delay B+A+, Delay(AB)-
Draw the electro-hydraulic circuit using 4/3 double solenoid ass final directional control valves. The auxiliary condition is that single cycle or multi-cycle can be selected.

10 M

5 (b) The open loop T.F. of unity feedbacks system is

$G(S) = \dfrac {K}{S(1+TS)}$ for this system overshot reduces from 0.6 to 0.2 due to change in "K" only. Show that-

$\dfrac {T K_1-1} {TK_2-1} = 43.33$ where K₁ and K₂ are values of K for 0.6 and 0.2 overshot respectively.

10 M

6 (a) For a system with characteristics equation, F(S)=s⁶+3S⁵+4S⁴+6S³+5S²+3S+2=0, examine stability using Routh's criterion.

6 M

6 (b) Define (a) Gain Margin and (b) Phase Margin.

6 M

6 (c) Differentiate between stepper motor and servo motor.

8 M

Write short notes on:

7 (a) Advantages of PI controller

5 M

7 (b) Transient response of a control system.

5 M

7 (c) Polar plot.

5 M

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