Question

Recently you had an appointment for passport form submission in Agargaon. In the passport office’s

biometric acquiring chamber, only 4 people are allowed in a queue while maintaining a three feet distance
between them. There is a yellow line in front of the chamber to mark it as a no crossing. If more than 2
people cross the line at the same time an alarm goes off. Each awaiting applicant has one digital token with
a sensor to detect their presence in the chamber.
Your task is to:
i. Outline the necessary steps in correct sequence of the standard procedure to design a digital
system for alarm circuit and design the system. Also show the outlined steps, which will trigger
the alarm and implement the system with CMOS logic.
ii. The human audible ranges from 20Hz – 20kHz. However, any sound below 250Hz is
disturbingly low pitched and any sound above 4500Hz is disturbingly high pitched. Design the
alarm timer circuit with a frequency of P5 Hz and a duty cycle of Q% [where P= N+O+I+S+E
and Q = 100 – P]. However, if P5 Hz is not within soothing is hearing limits, take frequency, f
=400Hz. Choose the capacitor value from the given list based on the suitability of your
requirements. (C = 50uF/250uF/470uF)
iii. State the limitations of this developed system and explain the effect of increasing the frequency
above 4500Hz.

Answer 1

the chamber indicating where the queue starts. However, when you arrived at the passport office, you noticed that there were already 6 people waiting in the queue, all standing closer than three feet apart.

You approached the person at the end of the queue, a middle-aged man wearing a blue shirt, and politely informed him about the social distancing guidelines. He seemed unaware of the distance requirement and apologized for the oversight. The man then proceeded to inform the others in the queue, and they all rearranged themselves, making sure to maintain the required distance.

After the adjustment, there were still 6 people in the queue, but now they were standing in a proper and socially distanced manner. You thanked the man for his cooperation, and he expressed gratitude for bringing it to their attention.

As time passed, the queue gradually moved forward. You patiently waited for your turn, making sure to maintain the required distance from the person in front of you. Eventually, you reached the front of the queue and entered the biometric acquiring chamber.

Inside, you were greeted by a staff member who guided you through the process. They checked your documents, verified your identity, and proceeded with the biometric acquisition. The staff member ensured that all necessary precautions were taken, including sanitizing the equipment before and after each use.

Once the biometric acquisition was completed, you were given a receipt and informed about the next steps in the passport application process. You thanked the staff member for their assistance and exited the chamber, feeling relieved that everything went smoothly.

Leaving the passport office, you reflected on the importance of following safety guidelines, especially during these challenging times. It was reassuring to see that the passport office had implemented measures to ensure the safety and well-being of its visitors.