This document contains information about an exam for the position of Assistant Manager (Technical) at Bangladesh Telecommunication Company Limited (BTCL). It includes 10 multiple choice questions covering topics like protocols, fiber optic transmission, and signal processing. It also contains information about a previous exam for the position of Assistant Engineer (CSE) at BTCL from 2017, including 18 questions on topics such as data structures, SQL queries, pipelining, and IP addressing.

1. Bangladesh
Telecommunicaiton
Compnay Limited
Written Part
Exam 1: AM-2021
Exam 2: AM-2017
S
E
T
7

2. Bangladesh Telecommunicaiton Company Limited
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BTCL
Recruitment Test-2021
Assistant Manager (Technical)
Date: 05-02-2021 Exam Taker: BUET
1. Find Rab? [Stack IT Job Solution-1341]
2. Determine the load impedance ZL that maximizes the
average power drawn from the circuit of Figure.(2).
What is the maximum average power? [Stack IT Job
Solution-1358]
3. Sketch the time Variation of output voltage(VoVst)
for given input voltage Vi. Assume Vz =3.
4. The measured equivalent DC Resistance between two
line for the HT winding of a 11/0.415kv 200kva, 3φ Δ-Y
Conductor distribution Transformer is 6 ohm at 200
C .
Calculate the DC Resistance of each phase winding in
the HT Side of Transformer for 750
C. Where
temperature co efficient α =0.00393/0
C [Stack IT Job
Solution-1398]
5. Find Vo/Vin [Stack IT Job Solution-1312]
6. Consider PCM system with a uniform quantize at
step size 2 v . The input is a sinusoidal signal with
amplitude of 10v. Calculate the signal to quantification
noise ration in dB and number of bits per sample to be
used in the system. [Stack IT Job Solution-1604]
7. Assume a TDMA Communication system having 8
transmitter-Receiver pairs. Each is sampled at 8khz that
generated 16 bit per sample. If two synchronous bits are
used in each frame. Calculate the data rate of the
TDMA Link. [Stack IT Job Solution-1597]
8. 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.
9. A 1550nm fiber optic transmission Link if of 50km
length without repeating with a single mode fiber having
loss of 0.2dB /km. The fiber is joined every two km with
conductors each with 0.5dB loss. Determine the
minimum average power which should be lunched in to
the fiver in order to Tarantian an average optical power
level of 10 micro-Watt at the receiver. [Stack IT Job
Solution-1610]
10.Identify the Protocols
1. Sending Mail from sender computer to
receivers mail server.
2. Dynamically assign IP Address
3. IP Address to MAC Address
4. Send error to the source ip of the originating
packet.
Solution:
1. Sending Mail from sender computer to receivers
mail server. -SMTP
2. Dynamically assign IP Address-DHCP
3. IP Address to MAC Address-ARP
4. Send error to the source ip of the originating
packet.-ICMP
11. An IP Address 192.168.10.0/23. Find- [Stack IT
Job Solution-1461]
1. Subnet Mask
2. Unique ID(Host)
3. Broadcast ID
4. Last usable host address.
12. Write a function sumdigits to find output like below
Input: 123
Output: 6
#include <stdio.h>
int main()
{
int n, sum;
printf("Enter an integern");
scanf("%d", &n);
sum= sumdigits(n);

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printf("Sum of digits of %d = %dn", n, sum);
return 0;
}
Solution:
int sumdigits(int num){
if(num==0)
return 0;
else
return num%10+sumdigits(num/10);
}
13. 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
SMTP- Simple Mail
Transfer Protocol
Network management
protocol used to automate
the process of configuring
devices on IP networks
DHCP- Dynamic Host
Configuration Protocol
Mapping a dynamic
internet protocol address
address (IP address) to a
permanent physical
machine address in a local
area network(LAN)
ARP- Address Resulation
Protocol
Messages are typically
used for diagnostic or
control purpose or
generated in response to
errors in IP operations
ICMP- Internet Control
Message Protocol
Bangladesh Telecommunications Company Limited
(BTCL)
Assistant Engineer (CSE)-2017
Exam Taker-BUET; Exam Date: 2017
Total Marks-100[Dept. 40 Written, Non Dept. 60 MCQ]
1. Design 4x1 MUX with two selection line & 4 input
(A,B,C,D).
2. Find the smallest and second smallest elements in an
array.
3. Salesperson (ID, Name, Age, Salary), Customer (ID,
Name, City, Industry, Type) Orders (Number,
order_date, cust_id, salesperson_id, Amount). Given
table above find the following:
a) The names of all salespeople that have an order
with Samsonic.
b) The names of all salespeople that do not have
any order with Samsonic.
c) The name of all salespeople that have 2 or more
orders.
4. What is pipelining? Explain execution stages?
5. Linux command explain with example: mkdir, passwd,
telnet, cat, Is, ping, su, nslookup.
6. Find the output of the following program
#include<stdio.h>
#define N 7
int main() {
Char str[] = “abpqxn”;
int i = 0;
for(i=0; i<N-2; i++)
if(i%2)
printf(“%c”, str[i]++);
else
printf(“%c”, str[i]--);
return 0;
}
7. What’s MAC flood in switch? How to prevent the MAC
Flooding Attack?
8. What are the disadvantages of manual/static IP? Name
the protocol of dynamic IP assigning. DHCP how
work?
9. What is query to display even rows from the employees
table?
10. How to get distinct records from the employees table
without using distinct keyword.
11. Write an SQL query to print the name of employees
having the highest salary in each department.
12. Subnet the class C IP address 195.1.1.0 So that you
have at least 2 subnets each subnet must have room for
48 hosts. What are the two possible subnet masks?
13. (a) The attenuation of a signal is 10dB. What is the
final signal power of it was originally 5W?
(b) A signal has passed through three cascaded
amplifiers, each with a 4dB gain.
(c) If the bandwidth of the channel is 5Kbps, how
long does it take to send a frame of 100000 bits
out of this device?
14. Given an IP address 10.2.3.20/22, Find out the number
of host and subnet mask.
15. Write a program to find out the minimum number from
a series.
16. Using pipeline calculate the value of fetch and
execution cycle.
17. Given a database table with some column
a) find out the min salary from table
b) find out a matched string
18) Probably a SQL query
a) show the branch name with the minimum balance
b) select all dept_name, roll from Student

4. Bangladesh Telecommunicaiton Company Limited
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IT
Question
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01789741518,
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Exam:
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