STUPIDSID
Solve any one question from Q1 and Q2
1 (a)
Temperature of a hot plate is to be measured using Thermocouple. For this, draw the set- up and explain the principle of working.
6 M
1 (b)
From the block diagram in Figure 1, determine the transfer function: C/R.
4 M
2 (a)
A capacitive type proximity sensor is to be used for displacement measurement. Discuss the criterion for selection of this sensor.
6 M
2 (b)
Discuss the role played by following four elements in a Mechatronic system:
i) Actuator
ii) Sensor
iii) Signal Conditioner
iv) Digital Architecture.
i) Actuator
ii) Sensor
iii) Signal Conditioner
iv) Digital Architecture.
4 M
Solve any one question from Q3 and Q4
3 (a)
For a DAC that is converting a voltage level ranging 0 -12 V into a single
byte of 6 bits, determine the equivalent decimal as well as analog values
and complete Table 1 below.
| Digital | Decimal | Analog |
| 010000 | ? | ? |
| 111110 | ? | ? |
8 M
3 (b)
Draw a suitable block diagram to depict the principle of operation of open loop control.
2 M
4 (a)
In the process of sampling, define as well as discuss the importance of:
i) Sampling Theorem
ii) Aliasing
i) Sampling Theorem
ii) Aliasing
8 M
4 (b)
Write two distinct points of comparison between open loop and closed loop control system.
2 M
Solve any one question from Q5 and Q6
5 (a)
Using suitable example, draw a ladder diagram and explain how Latching is implemented.
8 M
5 (b)
Write ladder logic for a simple traffic light controller for the following sequence of operations as below:
Step 1: Turn Green ON for 35 seconds.
Step 2: Turn Yellow ON for 5 seconds,
Step 3: Turn Red ON for 40 seconds,
Step 4: Repeat the sequence i.e. Step 1-Step 2-Step 3.
Step 1: Turn Green ON for 35 seconds.
Step 2: Turn Yellow ON for 5 seconds,
Step 3: Turn Red ON for 40 seconds,
Step 4: Repeat the sequence i.e. Step 1-Step 2-Step 3.
8 M
6 (a)
Using suitable example, draw a ladder diagram and explain how timer is implemented
8 M
6 (b)
Discuss the role played by following four elements in a PLC:
i) Input Module
ii) Memory
iii) CPU
iv) Bus.
i) Input Module
ii) Memory
iii) CPU
iv) Bus.
8 M
7 (a)
For the system in Figure 2, assume m=mass=1kg. k=spring stiffness=2 N/m and b=damping=0.5 Ns/m. Also. x is the system output and y is the system input, Which is motion of the base on which the system rests.
For this system:
i) Determine the transfer function: x(s)/y(s)
ii) Identify the location of the Poles and zeros.
iii) Comment on the stability of the system.
For this system:
i) Determine the transfer function: x(s)/y(s)
ii) Identify the location of the Poles and zeros.
iii) Comment on the stability of the system.
10 M
Solve any one question from Q7 and Q8
7 (b)
Draw suitable sketch to depict the unit step response of a second order system when:
i) System poles are negative and real
ii) System poles are complex conjugate pair with negative real part
iii) System poles are a imaginary pair with no real part
i) System poles are negative and real
ii) System poles are complex conjugate pair with negative real part
iii) System poles are a imaginary pair with no real part
6 M
8 (a)
Define the following terms:
i) Steady State Error
ii) Gain Margin
iii) Phase Margin
iv) Rise Time
v) Damping Frequency
vi) % Overshoot
i) Steady State Error
ii) Gain Margin
iii) Phase Margin
iv) Rise Time
v) Damping Frequency
vi) % Overshoot
6 M
8 (b)
Estimate the approximate transfer function of a system. of which the bode plot is shown in Figure 3.
10 M
Solve any one question from Q9 and Q10
9 (a)
Figure 4 shows an error time graph. Sketch the PID controller (parallel form) output w.r.t time. Assume Kp=10, K1=2, Kd=0.5 and Po=0 i.e the controller output is zero when the error is zero.
10 M
9 (b)
A second order system is under damped. inherently. Discuss the step by step procedure for manual tuning of a PID controller so that the behaviour of the system becomes that of a critically damped one.
8 M
10 (a)
Figure 5 shows an error time graph. Sketch the PID controller (series form) output w.r.t time. Assume Kp=10, K1=2, KD=0.5 and P0=0 i.e the controller output is zero when the error is zero.
10 M
10 (b)
Using a suitable block diagram explain the working of PID control in Parallel form.
8 M
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