#1
August 22nd, 2016, 05:45 PM
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Sample Paper For BSNL TTA Exam
Hii Buddy , Here I m looking for Previous year BSNL Telecom Technical Assistants Recruitment Exam paper , Would you plzz Provide me ?
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#2
August 22nd, 2016, 05:59 PM
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Re: Sample Paper For BSNL TTA Exam
Friend As on your Asking Here I m Providing Sample Question Which Asked in BSNL Telecom Technical Assistants Recruitment Exam : 1) Wave guides are generally made of (a) Cast iron or steel (b) White metal or gun metal (c) bronze or aluminium (d) plastic or bakelite 2) The cut off frequency of a wave guide means (a) lower frequencies will not be propagated (b) it determines the dimensions of the wave guide (c) frequency at which zero transmission takes place (d) None of above 3) In case of matched load (a) Transmission is zero (b) reflection is zero (c) reflection is unity (d) transmission is equivalent to reflection 4) In an AM wave with 100% modulation, the carrier is suppressed. The percentage of power saving will be (a) 100% (b) 50% (c) 25% (d) 66.7% 5) The function of AM detector circuit is (a) to rectify the input signal (b) to discard the carrier (c) to provide the audio signal Sponsored Links (d) All of the above 6) In FM, the noise can be further decreased by (a) decreasing deviation (b) increasuig deviation (c) keeping deviation constant (d) none of these 7) In PPM, message resides in (a) Pulses (b) time location of pulse edges (c) none of these 8) Which of the following pulse systems is preferred for communication in presence of noise? (a) PAM (b) PDM (c) PPM (d) none of above 9) Which of the following pulse systems requires higher bandwidth (a) PAM (b)PDM (c)PPM (d)none of these 10) The audio frequency range lies between (a) 20 to 20,000 Hz (b) 20 to 20,000 KHz (c) 400 to 8,000Hz (d) 500 to 5,000 Hz 11) Maximum undistorted power output of a transmitter is obtained when its modulation is: (a) more than 100% (b) 100% (c) less than 100% (d) 50% 12) The AGC voltage in a radio receiver is proportional to (a) the amount of modulation (b) the amplitude of audio signal (c) the amplitude of IF carrier (d) none of these The Most Common Modulation System Used for telegraphy is FSK PSK PCM Single tone Modulation Two Tone Modulation VSB is an Abbreviation if vestigial Sideband, is derived by Filtering DSB AM Either (a) or (b) PM The Hartely Law State that The Maximum Rate of Information transmission depends on the Depth of Modulation The Maximum Rate of Information Depends on the channel Bandwith Only Binary Codes may be used Redundancy is Essential The FM Signal with a Modulation index mf is passed through a Frequency Tripler. The Wave is the Out Put of the Tripler will have a modulation Index of Mf 9 Mf 3 Mf 3 Mf 9 Mf In high power AM transmission, Modulation is done at Buffer Stage Oscillator Stage RF Stage IF Stage Vacuum Tube Eventually Fall at Microwave Frequencies Because of their Inter Electrode Capacitance Small Series inductance Large Shunt Capacitance Short Transit Time Increase Noise Figure The Biggest Disadvantage the IMP ATT Diode has is its Low Efficiency High Noise Low BW Inutility to provide Pulse Operation Low Power handling Ability In AM transmission the Frequency, Which is not transmitted is Carrier Frequency Audio Frequency Upper Side Frequency Lower Side Frequency FM Broadcast band lies in VHF UHF SHF HF The Modulation System inherently is most Noise Resistant in SSB Suppressed carrier FM PPM PCM |
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