BTCL Assistant Manager Exam 2021 — Question Solution | বিটিসিএল সহকারী ব্যবস্থাপক নিয়োগ পরীক্ষা ২০২১ — প্রশ্ন সমাধান

For the following description of various IP networking protocols write down the protocol name and its full form in the following table:

Description	Answer
Sending mail from sender computer to receivers mail server.
Network management protocol used to automate the process of configuring devices on IP networks.
Mapping a dynamic Internet Protocol address (IP address) to a permanent physical machine address in a local area network (LAN).
Messages are typically used for diagnostic or control purposes or generated in response to errors in IP operations.

Answer the following:

Question	Answer
(i) 192.168.10.0/23, How many usable address?
(ii) 192.168.10.0/23, Find subnet mask.
(iii) 192.168.10.0/23, Find Broadcast Address.
(iv) 192.168.10.0/23, What is last usable host?

Given an integer number the following C program finds the sum of the digits of the number using recursion. You need to complete the recursive function in the following program. So that it does the intended task.

#include<stdio.h>
int someDigits(int num){
    ________________________
    ________________________
    ________________________
    ________________________
}
int main(){
int n;
scanf("%d",&n);
printf("%d", sumDigits(n));
return 0;
}

Assuming Ideal Op Amps, Find The Voltage Gain V₀/Vᵢ of the following circuit.

The circuit:

• The input v_i is applied through a 10 kΩ resistor to node X.
• Node X is connected to the inverting (−) input of the op amp.
• A second 10 kΩ resistor connects node X to ground.
• A 100 kΩ feedback resistor connects the op-amp output to node X.
• The non-inverting (+) input is connected to ground.
• The output v_o is taken at the op-amp output.

Assume a TDMA based communication system having 8 transmission receiver pairs. Each source is sampled at 8KHz. That generates 16bits per sample if two synchronization bits are added to each frame calculate the data rate of TDMA line.

A PCM system has a step resolution of 2V. Sinusoidal signal amplitude 10V. SNR=? And total number of bits=?

Where are the low loss transmission windows of silicon based optical fiber and Which window is the most popular in communication and wave. Draw diagram of a long haul WDM Transmission system.

A 1550nm fiber optic transmission Link if of 50km length without repeating with a signal mode fiber having loss of 0.2dB/km. The fiber is joined ever 2km with conductor each with 0.5dB loss. Determine the minimum average power which should be lunched in to the fiver in order to Tarantion an average optical power level of 10 micro-watts at the receiver.