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Electrical Engineering
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Explain possible communication strategies and presentation methods that could be used to inform the stakeholders of the recommended solution

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Related questions

Q1. Consider a VLC (Visual Light Communication) system. In which LED is used as a Transmitter to send
the information and PD (Photo Detector) is used as a Receiver to decode the signal. Suppose you insert
a slowly varying information signal V(t) that is a voltage signal to the LED, which produces a time
varying light signal P(t). If the light signal is propagated through an ideal channel with no noise, it
produce a voltage signal at the PD VPD(t)= 3.5sin(20t + π/2).
1. Draw the important block diagram of the communication system.
2. Sketch or Label the IP/OP signals in the diagram.
3. Draw VPD(t)
4. Suppose that channel has an ambient light (Noise) which generated by another light source.
That noise is generated 1V DC voltage at the PD.It is a Noise and additive to the desired
signal.
Draw the block diagram of the new communication systems and Sketch or Label the IP/OP
signals in the diagram.
5. Draw VPD(t) with the additive noise.
6. Propose a method to eliminate this ambient light noise.

Consider a VLC (Visual Light Communication) system. In which LED is used as a Transmitter to send
the information and PD (Photo Detector) is used as a Receiver to decode the signal. Suppose you insert
a slowly varying information signal V(t) that is a voltage signal to the LED, which produces a time
varying light signal P(t). If the light signal is propagated through an ideal channel with no noise, it
produce a voltage signal at the PD VPD(t)= 3.5sin(20t + π/2).
1. Draw the important block diagram of the communication system.
2. Sketch or Label the IP/OP signals in the diagram.
3. Draw VPD(t)
4. Suppose that channel has an ambient light (Noise) which generated by another light source.
That noise is generated 1V DC voltage at the PD.It is a Noise and additive to the desired
signal.
Draw the block diagram of the new communication systems and Sketch or Label the IP/OP
signals in the diagram.
5. Draw VPD(t) with the additive noise.
6. Propose a method to eliminate this ambient light noise.

Question 5  (IEIIQ18)

A simple Zener shunt voltage regulator is to supply a 10 V to load of 100 mA, the input supply voltage varies between 15 V and 20 V.

5.1    Draw the circuit diagram.

5.2    Calculate the minimum power for the Zener that could be used safely in this circuit.

5.3    Using a Zener diode with a power rating of twice this minimum value.

5.4    Calculate the range of series resistance that may safely be used in this circuit and suggested a suitable standard resistance value.

Question 6  (IEIIQ19)

A voltage regulator is required to provide a regulated terminal voltage of 25 V at a maximum load of 150 mA. The input volage varies between 50 V and 75 V dc.

6.1    Calculate the minimum power for the Zener that could be used safely in this circuit.

6.2    If a 30 W rated Zener is used, calculate the range of possible series resistance, RS. values and suggest a suitable standard E12 resistor value.

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