কমিউনিকেশন ইঞ্জিনিয়ারিং MCQ
1. Fiber optic cable is made of-
Glass
Copper
Plastic
None
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ব্যাখ্যা: 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
2. 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
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ব্যাখ্যা: If the coded values are transferred during the same time interval from input to output the technique is called space switching.
3. In television transmission, picture signals are transmitted by.
AM
FM
PCM
PAM
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ব্যাখ্যা: in television transmission, picture signals are transmitted by amplitude moddation (AM), AM allows to transmit picture signals.
4. Satellite power requirement is provided through-
Lead-acid batteries
Dry cell
Solar cells
Nickel-cadmium cells
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ব্যাখ্যা: 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.
5. Which one transfers data at the highest speed?
UTP
STP
co-axial cable
fiber optic cable
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ব্যাখ্যা: Fiber optic cable transmit data in the form of light at very high speed.
6. Which one is an example of DBMS?
MS Word
MS Excel
C**
MS Access
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ব্যাখ্যা: Datbase management system (DBMS) examples: My- SQL, Postgre-SQL, Microsoft Access, SQL server, Filemaker, Oracle, Foxpro.
7. SNR = ?
N 0 / S 0
S 0 / N 0
S 0 / N0
S 0/ S 0
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ব্যাখ্যা: SNR is defined as the ratio of signal power to the Nove power, often expressed in decibels
8. How many unique signs could be specified by using ASCII-8?
128
256
512
65536
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ব্যাখ্যা: 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.
9. Which of the following converts the document written by HTML?
Browser
FTP
HTPP
Web
10. In TV transmission the voice signal is modulated.
AM
FM
PM
FSK
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ব্যাখ্যা: Voice signal is FM modulated and video signal is AM modulated.
11. 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°
12. Full form of URL is-
Uniform Resource Locator
Uniform Resource Link
Uniform Registered Link
Uniform Resource Link
13. Non-coherently detection is not possible for-
PSK
ASK
FSK
Both (a) and (c)
14. একটি বেতার তরঙ্গের দৈর্ঘ্য ৩০০ মিটার। এর কম্পাঙ্ক কত?
৫ মেগাহার্টজ
১ মেগাহার্টজ
৪ মেগাহার্টজ
২ মেগাহার্টজ
15. 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
16. Waveform shown in figure is that for-
FM
PCM
AM-DSB
AM-SSB
17. 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)
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ব্যাখ্যা: Call completion rate is defined as the ratto of number of successful calls to the menber of all call attempt.
18. Which one acts as the backbone of global village?
Hardware
Software
Networks and connectivity
Data
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ব্যাখ্যা: 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.
19. What is the acceptance value of dividing point between the Wonderb and Jitter?
200Hz
50Hz
20Hz
10Hz
Himalay Sen Sir
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ব্যাখ্যা: Frequency range of/ phase variations Liner/>10Hz Wander /0-10Hz
20. The intermediate frequency in a standard AM receiver is-
455 Hz
455 kHz
4.55 MHz
None of the above