Multiple Choice Questions Electronic Communication Systems

Multiple Choice Questions Electronic Communication Systems

The Multiple Choice Questions Electronic Communication Systems are as below:

01. In Amplitude Modulation, only amplitude of carrier is varied; ________ and _____ remains the same

02. __________ antenna is a metallic conductor (of suitable shape & size) which radiates electromagnetic waves when AC is passed through it.

03. In Ground Wave Propagation, absorption of radiowaves by earth / atmosphere is high for _____ frequency

05. The wireless frequency band for Satellite Communication (Uplink) is _______ to _____ GHz04. True or False: In Ground Wave Propagation, only vertically polarized EM waves can travel along surface; horizontally polarized gets short circuited when in contact with earth

06. In Sky Wave Propagation, radiowaves gets reflected from ___________, which acts like reflecting surface.

07. _________ Frequency is the maximum frequency of radiowaves which can be totally reflected from ionosphere.

08. In Sky Wave Propagation, ____________ is the maximum angle made by radiowaves with horizontal, above which no waves are reflected back

09. Amplitude of AM carrier wave is equal to sum of amplitudes of _______ and ______ waves

10. In Sky Wave Propagation, ______ is the disappearance of signals for short time due to variations of height and density of ions in ionosphere

Multiple Choice Questions Electronic Communication Systems
Earth’s Atmosphere

11. True or False: In Amplitude Modulation, stereo sound transmission is possible

12. In Space Wave Propagation, space waves have three components:
a. Direct Wave
b. ___________ Wave
c. Tropospheric Wave

13. A ________ system is a device or setup used in transmission of information from one place to another

14. Bandwidth of Co-Axial cable is __________

15. True or False: Ground Wave Propagation is suitable for long-range transmission

16. In Amplitude Modulation, the modulated signal consists of the carrier wave of frequency (ωc) plus two sinusoidal waves each with a frequency slightly different from (ωc), known as ___________

17. A device which converts one form of energy to another form is called as _________

18. True or False: Amplitude Modulation has high efficiency of transmission

19. The Frequency Bands for Standard AM broadcast is ____ to _____ kHz

20. The electromagnetic waves of high frequency and constant amplitude over which signal are superimposed so as to carry from place to another are called _________

21. Atmosphere is envelope of gases surrounding Earth containing ____% oxygen

22. True or False: Amplitude Modulation has noisy reception.

23. The medium through which the transmitter and receiver are connected is called _________

24. The modes of Space communication are:
a. Ground Wave Propagation
b. Sky Wave Propagation
c. ______ Wave Propagation

25. The wireless frequency band for Television (UHF) is _______ to _____ MHz

26. A signal in which current or voltage varies continuously with time is called ______ Signal

27. Find odd one out: Troposphere, Stratosphere, Hydrosphere, Mesosphere, Ionosphere, and Exosphere

Multiple Choice Questions Electronic Communication Systems

28. The loss of strength of a signal while propagating through a medium is known as ____________

29. The wireless frequency band for Satellite Communication (Downlink) is _______ to _____ GHz

30. In Amplitude Modulation, as long as the broadcast frequencies are sufficiently spaced out, the sidebands do not _______ so that different stations can operate without interfering each other.

Answers: Multiple Choice Questions Electronic Communication Systems

01. frequency, phase
02. Transmitting
03. high
04. True
05. 5.925 – 6.425 GHz
06. ionosphere
07. Critical
08. Angle of Radiation
09. carrier and signal
10. Fading
11. False {Due to limited bandwidth, stereo sound transmission is not possible}
12. Ground Reflected
13. communication
14. 750 MHz
15. False {not suitable}
16. side bands
17. Transducer
18. False {low efficiency (20-30% useful)}
19. 540 – 1600 kHz
20. Carrier Waves
21. 21
22. True {AM signals are easily affected by external atmosphere and electrical disturbances}
23. Channel
24. Space
25. 174 – 216 MHz
26. Analog
27. Hydrosphere {Rest are layers of Atmosphere}
28. Attenuation
29. 3.7 – 4.2 GHz
30. overlap

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