basic communication engineering solved objective questions Electronics & Telecommunication Engineering – Solved MCQ Quiz olved question papers on electronics and telecommunication engineers Problems and Solutions in Electronics & Communication Engineering 1.Communication is a process of a) transfer of information b) transfer of energy c) transfer of channel d) none of these Ans:a 2. An example of communication service a) printer b) television c) both(a)&(b) d) none of these Ans:b 3. Channel is a) medium b) signal c) carrier d) none of these Ans:a 4. Analog signal varies with a) sampling time b) time continuously c) sampling frequency d) none of these Ans:b 5. Discrete signal is represented by a) coding b) modulation c) demodulation d) sequence of samples Ans:d 6. Carrier signal has a) constant magnitude b) constant frequency c) variable frequency d) variable time Ans:a 7.Modulating signal has a) low frequency b) low modulation c) high frequency d) none of these Ans:a 8. Modulation index is a) Vm/Vc b) Vc/Vm c) Vm/Ic d) None of these Ans:a 9. fc +fm is a) upper band frequency b) lower band frequency c) mid band frequency d) none of these Ans:a 10. fc –fm is a) upper band frequency b) lower band frequency c) mid band frequency d) none of these Ans:b 11.In amplitude modulation, frequency is a) constant b) zero c) variable d) one Ans:a 12. In amplitude modulation, amplitude is a) constant b) zero c) variable d) none of these Ans:c 13.In frequency modulation, frequency is a. constant b. zero c. variable d.one Ans:c 14. In frequency modulation, amplitude is a.constant b.zero c.one d.variable Ans:a 15. frequency modulation has a) one carrier b) one carrier with two side band frequencies c) one carrier with infinite frequencies d) none of these Ans:c 16. Amplitude modulation has a) one carrier b) one carrier with two side band frequencies c) one carrier with infinite frequencies d) none of these Ans:b 17.FM signal is less affected by a) loss b) temperature c) frequency d) noise Ans:d 18. FSK is a) frequency shift keying b) frequency shine keying c) frequency shine keyboard d) none of these Ans:a 19. ASK is a) Amplitude shift keying b) Amplitude shift keyboard c) Amplitude shine keying d) none of these e) Ans:a 20. HPA is a) high power audio b) high port audio c) high power amplifier d) none of these Ans:c 21. Word ‘SCANNING’ is used in in a) telecost b) telephone c) radio d) TV Ans:d 22. The frequency range of 1GHZ to 30GHZ are referred as a) sound waves b) micro waves c) mini waves d) none of these Ans:b 23 . IF is a) interference frequency b) interconnection frequency c) intermediate frequency d) none of these Ans:c 24. Low pass filter attenuates a) high frequencies b) low frequencies c) medium frequencies d) none of these Ans:a 25 . high pass filter attenuates a) high frequencies b) low frequencies c) medium frequencies d) none of these Ans:b 26. Low pass filter allows a) high frequencies b) medium frequencies c) zero frequency d) low frequencies Ans:d 27. High pass filter allows a) high frequencies b) medium frequencies c) zero frequency d) low frequencies Ans:a 28. Primary component of uplink section of satellite is a) transformer b) transistor c) earth station transmitter d) power station transmitter Ans:c 29. Micro wave communication is used in a) TNEB b) telephone networks c) industries d) none of these Ans:b 30. Non electric signal is converted into electrical signal by a) transmitter b) receiver c) line d) none of these Ans:a 31. In order to reduce interference, the signal should be a) amplified b) multiplied c) demodulated d) modulated Ans:d 32. An example for an analog signal a) Sine wave b) impulse signal c) sample signal d) None of these Ans:a 33. Messages travel from transmitter to receiver with help of a) Transmitter b) Receiver c) channel d) antennas Ans:c 34. Bandwidth of FM signal is —than AM signal a) lesser b) either lesser or larger c) larger d) none of these Ans:c 35. In AM modulation ,when the modulation index increases, transmitted power is a) constant b) increased c) decreased d) none of these Ans:b 36. In FM modulation ,when the modulation index increases, transmitted power is a) constant b) increased c) decreased d) none of these Ans:a 37. Sound signalsin TV are a) amplitude modulated b) dc modulated c) frequency modulated d) a and c Ans:c 38. Video signals in TV are a) amplitude modulated b) de modulated c) frequency modulated d) none of these Ans:a 39. In optical communication, carrier is a) electromagnetic waves in optical frequency b) electromagnetic waves in maximum frequency c) electromagnetic waves in minimum frequency d) none of these Ans:a 40. Optical detector is a) diode b) PIN photo diode c) transistor d) none of these Ans:b 41.Optical fibre has—diameter a.small b.large c.zero d.none of these Ans:a 42. Optical fibre is fabricated by a) glass b) copper c) aluminium d) none of these Ans:a 43.An earth station receiver consists of a.RF to IF down converter b. IFto RF converter c.either (a)&(b) d.none of these Ans:a 44. An earth station transmitter consists of a.RF to IF down converter b. IFto RF converter c. either (a)&(b) d.none of these Ans:b 45.VHF is a.very low frequency b.very high frequency c.very hot frequency d.none of these Ans:b 46. TRF is nothing but a.TV radio frequency b.Tuned radio frequency c.Tube radio frequency d.none of these Ans:b 47.which one of the following is the type of ‘superheterodyning’ a.Radio transmitter b.TV c.radio receiver d.radar Ans:c 48.AFC is nothing but a.Audio frequency control b.Automatic frequency control c.Amplitude frequency control d.none of these Ans:b 49.The maximum power in AM,when modulation index is a.0 b.0.5 c.0.7 d.1 Ans:d 50.Primary colours are a.red,blue.green b.green,white.blue c.blue,red.yellow d.none of these Ans:a
Posted on: Fri, 28 Jun 2013 21:32:25 +0000
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