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#1
December 27th, 2013, 11:25 AM
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 BSNL JTO Electronics and Communication paper
Will you please provide here the BSNL JTO Electronics and Communication paper?
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#2
December 27th, 2013, 02:30 PM
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| Re: BSNL JTO Electronics and Communication paper
You are looking for the BSNL JTO Electronics and Communication paper, some questions i am giving here: Q-meter works on the principle of a. series resonance b. parallel resonance c. mutual inductance d. self inductance Which one of the following is a ceramic insulator? a. Mica b. Porcelain c. Liquid crystal d. Synthetic fiber Which one of the following represents a direct band-gap material? a. Si b. Ge c. GaP d. GaAs Which one of the following statements is NOT true? a. Rochelle salt exhibits ferroelectric property. b. Spontaneous polarization is a characteristic property of ferroelectric material. c. Spontaneous polarization of ferroelectric materials usually vanishes below ferroelectric Curie temperature. d. Ferroelectric materials exhibit hysteresis effect. Which one of the following diodes contains a metal-semiconductor junction? a. Tunnel diode b. Zener diode c. Schottky diode d. Gunn diode Which one of the following statements is TRUE for an ‘ideal’ power diode? a. Forward voltage drop is zero and reverse saturation current is non-zero. b. Reverse recovery time is non-zero and reverse saturation current is zero. c. Forward voltage drop is zero and reverse recovery time is zero. d. Forward voltage drop is non-zero and reverse recovery time is zero. The phenomenon of injection electroluminescence is the basis of working of a. photodiodes b. light emitting diodes c. phototransistors d. solar cells for detailed paper here is attachment: |
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#3
February 18th, 2015, 02:56 PM
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| Re: BSNL JTO Electronics and Communication paper
Ok, as you want the question paper of Electronics and Communication of BSNL JTO exam so here I am providing you. BSNL JTO exam Electronics and Communication question paper Q.1.Which of the following is the ideal characteristics of OP-AMP Bandwidth is zero Offset voltage is infinite Output voltage is infinite CMMR is infinite Q.2.A signal has frequency components from 300Hz to 2 kHZ.The minimum possible rate at which the signal has to be sampled 600Hz 900Hz 2kHz 4Khz Q.3.Negative feed back in amplifiers is used to Improves the SNR at the input Improves the SNR at the output Reduces distortion Doesn’t effect the SNR at the output Q.4.In PCM system, if the quantization levels are increased from 2 to 8, the relative bandwidth requirement will. remain same be doubled be tripled become four times Q.5.Fulladder consists of 1 half adder and 1 AND gate 2 Half adders and 1 XOR gate 1 Half adder and 1 OR gate 2 Half adders and 1 OR gate Q.6.Flipflop is a Monostable Bistable Astable None of these Q.7.For a 8 bit counter the number of filp flops required is 2 4 3 1 Q.8.In 8085 microprocessor The data bus has Unidirectional Bi-directional Both None of these Q.9.The number of hardware interrupts in 8085 Microprocessors 2 4 3 D. 5 Q.10.Which of the following is used for Wider bandwidth in amplifiers Cascade connection Darlington Cascode connection Both A and B Q.11.When modulation changed from 0 to 1 then power increases by 20% 40% 50% 90% Q.12.The highest modulation frequency typically used in AM broadcast is 5KHz 10kHz 15kHz 22kHz Q.13.Time division multiplexing used in Analog communication Digital communication Both A and B None of these Q.14.In a delta modulation the slope overload and Granular noise occurs when small an ? small ? large and ? small ? small and ? large ? large and ? large Q.15.Convert decimal number (0.8125)10 to a binary number (0.1101)2 (0.1001)2 (0.1100)2 (0.1111)2 Q.16.Gray code is also called as Cyclic code Reflected code Both A and B None of these Q.17.Common base amplifier has High input impedance High output impedance Low output impedance None Q.18.In negative feedback the distortion will Increase Decrease Some times increase some times decrease None of the above Q.19.Barkausens criteria is Aß=1 Aß=-1 Both A and B None Q.20.Which of the following is more stable Wien bridge oscillator Crystal oscillator RC oscillatory Colpitts Oscillator Q.21.The forbidden energy gap for germanium atom 1.1 ev 0.7 ev 0.3 ev None Q.22.Maxwell’s curl equation for state magnetic field is given by ?xB=µ0J ?xB=0 ?.B=µ0J ?xB=µ0/J Q.23.For reflection coefficient ?=0.5,VSWR is 2 3 4 8 Q.24.The unit of µ0e0 is Farad henry Meter2/sec2 Amp-sec None Q.25.A low loss transmission line has R=wl, G=wC R< None Q.26.Which of the following has longest wavelength HF VHF UHF SHF Q.27.For a good conductor, the skin depth varies: Directly as frequency f Directly as √f Inversely as √f None Q.28.An antenna that is circularly polarized is Helical Yagi-uda Parabolic Small circular loop Q.29.In series resonance circuit the voltage source is Low resistance High resistance Zero resistance None of the above Q.30.A network is non linear if it doesn’t satisfy Homogeneity Superposition theorem Associative condition Both A and B Q.31.The gray code for number 6 is 1100 1001 0101 0110 Q.32.What is the addressing mode used in instruction LDA 0345 Direct Indirect Immediate Indexed Q.33.How many modes of operations are there in 8255 PPI? 1 2 3 4 Q.34.Which of the following has lowest efficiency Class A Class B Class AB Class C Q.35.The differential amplifier has a differential gain of 20000 CMRR=80dB. The common mode gain is 2 1 0.5 0 Q.36.Super-beta transistor is a Cascade configuration Cascode configuration Darlington configuration Matched pair Q.37.To eliminate ghosts in the picture Use a longer transmission line Connect a booster Change the antenna orientation or location Twist the transmission line Q.38.Vividh bharati programme is transmitted in Short waves Medium frequency Very high frequency None Q.39.The double energy transients occur in the R-L circuit R-C circuit Pure inductive circuit R-L-C circuit Q.40.The unit of flux is Weber Tesla Joule Weber/m2 Q.41.The transfer function H(s)=(s2-5s+100)/s2+5s+100 represents A high pass filter A band elimination filter A resonator An all pass filter Q.42.Double spotting in superhetrodyne receiver is caused by Poor front-end rejection Misalignment of receiver Detuning of one or more IF stages Non-functioning of AGC Q.43.The ratio of distance between cochannel to radius of the cell (D/R)is N √N 3√N √(3N) Q.44.MAHO stands for Mobile additive hand off Mobile assisted Hand off Mounted additive hand off None of the above Q.45.Traffic intensity is measured by Traffic Erlangs Seconds Decibels Q.46.Frequency selective fading means Band width of the signal is greater than the band width of the channel Delay speed is greater than symbol speed Both A and B None of these Q.47.HLR stands for Home localized rectifier Home location register Home loyality register None Q.48.A receiver has poor if selectivity,it will therefore also have poor Blocking Double spotting Diversity reception Sensitivity Q.49.The number of lines per second in the US monochrome TV system 31,500 15,750 63.5 525 Q.50.An LED made using GaAs emits radiation in Visible region Ultraviolet region Infrared region Microwave frequency region
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