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কমিউনিকেশন ইঞ্জিনিয়ারিং MCQ
1. If the voice channel is free in PSTN then what would be the maximum data rate supported by 3.1 kHz bandwidth of voice channel?
4000 bps
5000 bps
6000 bps
8000 bps
2. Waveform shown in figure is that for-
FM
PCM
AM-DSB
AM-SSB
3. If the vertical and horizontal components of geomagnetic field in a place is 32µT and 20µT respectively. How much is the dip?
32°
58°
51°
57°
4. Which kind of switching technique indicates the transfer of coded values from input to output during the same interval of time?
Space Switching
Time Switching
Combination Switching
None of the above
If the coded values are transferred during the same time interval from input to output the technique is called space switching.
5. Which of the following converts the document written by HTML?
Browser
FTP
HTPP
Web
6. Fiber optic cable is made of-
Glass
Copper
Plastic
None
নোট: A fiber optic cable is made of a glass or plastic core that carries light surrounded by the glass cladding that reflects "escaping" light back into the core, resulting in the light being guided along the fiber
7. SNR = ?
N 0 / S 0
S 0 / N 0
S 0 / N0
S 0/ S 0
SNR is defined as the ratio of signal power to the Nove power, often expressed in decibels
8. একটি বেতার তরঙ্গের দৈর্ঘ্য ৩০০ মিটার। এর কম্পাঙ্ক কত?
৫ মেগাহার্টজ
১ মেগাহার্টজ
৪ মেগাহার্টজ
২ মেগাহার্টজ
9. Satellite power requirement is provided through-
Lead-acid batteries
Dry cell
Solar cells
Nickel-cadmium cells
Different electrolyte is used in different storage syten and every electrolyte has limited life time. In solar cell there is no electrolyte. That's why solar cell is much greater than any other storage device or batteries.
10. What is the acceptance value of dividing point between the Wonderb and Jitter?
200Hz
50Hz
20Hz
10Hz
Frequency range of/ phase variations Liner/>10Hz Wander /0-10Hz
11. How many unique signs could be specified by using ASCII-8?
128
256
512
65536
ASCII is a computer code which uses 128 different encoding combinations of a group of seven bits (2 128) to represent, characters A to Z. both upper and lower case special characters, <, etc.
12. The intermediate frequency in a standard AM receiver is-
455 Hz
455 kHz
4.55 MHz
None of the above
13. Which one is an example of DBMS?
MS Word
MS Excel
C**
MS Access
Datbase management system (DBMS) examples: My- SQL, Postgre-SQL, Microsoft Access, SQL server, Filemaker, Oracle, Foxpro.
14. The ratio of number of successful calls to the number of all call attempts is known as:
Call Back Rate (CBR)
Call Completion Rate (CCR)
Busy Hour Call Rate (BHCR)
Effective Call Rate (ECR)
Call completion rate is defined as the ratto of number of successful calls to the menber of all call attempt.
15. Non-coherently detection is not possible for-
PSK
ASK
FSK
Both (a) and (c)
16. In TV transmission the voice signal is modulated.
AM
FM
PM
FSK
Voice signal is FM modulated and video signal is AM modulated.
17. Which one acts as the backbone of global village?
Hardware
Software
Networks and connectivity
Data
Networks and connectivity is termed as the backbone of global village. Using network, people can connect each other from one place to another place and all over the world.
18. In television transmission, picture signals are transmitted by.
AM
FM
PCM
PAM
in television transmission, picture signals are transmitted by amplitude moddation (AM), AM allows to transmit picture signals.
19. Full form of URL is-
Uniform Resource Locator
Uniform Resource Link
Uniform Registered Link
Uniform Resource Link
20. Which one transfers data at the highest speed?
UTP
STP
co-axial cable
fiber optic cable
Fiber optic cable transmit data in the form of light at very high speed.