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Paper Type : Electronics-Communication-Engineering-ECEPosted By : AfzalUpdated Date : Aug 2, 2014BSNL Electronics-Communication-Engineering-ECEplacement paper Question and answersBSNL recruitment process and aptitude testexperiences

BSNL GE-JTO Recruitment Examination Test Paper - IV

1. Reactive current through the inductive load produces-a) Magnetic fieldb) Electric fieldc) Super magnetic fieldd) None2. When a piece of copper and another of germanium are cooled from room temperature to 800 Kthen the resistance of -a) each of them increasesb) each of them decreasesc) copper increases and germanium decreasesd) copper decreases and germanium increases3. A capacitance transducer has two plates of area 5 cm2 each separated by an air gap of 2mm.Displacement sensitivity in pF /cm due to gap change would be -a) 11.1b) 44.2c) 52.3d) 66.34. The critical angle in degrees, for an electromagnetic wave passing from Quartz (m = m0, Î=4Îo)into air is-a) 15b) 30c) 45d) 905. When an RC driving point impedance function has zeros at s= -2 and s=-5 then the admissiblepoles for the function would be –a) s = 0; s = -6b) s = -1; s = -3c) s = 0; s = -1d) s = -3; s = -46. A capacitor used for power factor correction in single- phase circuit decreases –a) the power factorb) the line currentc) Both the line current and the power factord) the line current and increases power factor7. The unit of inductance is –a) ohmb) inductive reactancec) inductad) Henry8. Which type of by-pass capacitor works best at high frequencies –a) electrolyticb) micac) ceramicd) plexiglass9. The usual value of the surge impedance of a telephone line is –a) 600 Wb) 500 Wc) 75 Wd) none10. Telemetering is a method of –a) counting pulses, sent over long distancesb) transmitting pictures from one place to anotherc) transmitting information concerning a process over a distanced) None11. In an unbiased P-N junction thickness of depletion layer is of the order of –a) 0.005 mm

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b) 0.5 mmc) 5 mmd) 10-10 m12. One of the semiconductor device, which behaves like two SCRs is–a) UJTb) triacc) JFETd) MOSFET13. The following, which is not an advantage of semiconductor strain gauges as compared toconventional strain gauges, is –a) excellent hysterists characteristicsb) least sensitive to temperature changesc) high fatigue lifed) smaller size 14. The fundamental ripple frequency of a half wave 3F rectifier with a 3F supply of frequency 50Hz is –a) 150 Hzb) 50 Hzc) 100 Hzd) 250 Hz. 15. For an FR biased PNP transistor –a) base is negative with respect to emitterb) collector is positive with respect to emitterc) collector is a little more positive than based) base is a little less positive with respect to emitter than collector16. With normal operation of a JFET one can get IDss –a) the maximum drain currentb) the minimum drain currentc) normal drain currentd) none17. An SCR is a semiconductor device made up of –a) Four N type layersb) Two P types and three N type layersc) Two P type and two N type layersd) Three P type and one N type layers18. For a UJT, if R1 = resistance from emitter to base 1, R2 = resistance from emitter to the base 2and RBB = R1 + R2 then the intrinsic stand off ratio (h) is –

a)

b)

c)

d) 19. As the drain voltage is increased for a junction FET in the pinch off region then the draincurrent –a) becomes zerob) abruptly decreasesc) abruptly increasesd) remains constant20. 20 When the energy gap of a semiconductor is 1.1eV then it would be –a) opaque to the visible lightb) transparent to the visible lightc) transparent to the infrared radiationd) opaque to the infrared radiation21. The equivalent capacitance across ab will be –

d.022. In the following fig. the power dissipated is maximum when the value of Rx is –

a) 33.4 Kb) 17.6 Kc) 10 K

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d) 5 K23. The transfer function of a low pass RC network is –

24. The total capacitance across points 'a' and 'b' in the given figure is –

a) 1.66 mFb) 2.66 mFc) 3.5 mFd) 4.5 mF25. The load resistance needed to extract maximum power from the following circuit is –

a) 2Wb) 9Wc) 6Wd) 18W26. Which one of the following conditions for z parameters would hold for a two port networkcontaining linear bilateral passive circuit elements –a) z11 = z22b) z12z21 = z11z22c) z11z12 = z22z21d) z12 = z2127. In the network shown, the switch is opened at t = 0. Prior to that, the network was in thesteady state, Vs(t) at t = 0 is –

a) 0b) 5Vc) 10Vd) 15V28. Which of the following statements are correct –1. Tellegen's theorem is applicable to any lumped network2. The reciprocity theorem is applicable to linear bilateral networks.3. Thevenin's theorem is applicable to two terminal linear active networks.4. Norton's theorem is applicable to two terminal linear active networks.a) 1, 2 and 3b) 1, 2, 3 and 4c) 1, 2 and 4d) 3 and 429. Which one of the following transfer functions represents the critically damped system ?

30. When the respective coil impedance of the circuit shown in the fig. is are Z1 = (5 + j8)W andZ2=(3+j8) then the input impedance of the circuit will be –

a) (8 + 16j)Wb) (2 + j0)Wc) (15 + 64j)Wd) (8 + 0j)W31. One of the following statement which is not correct -a) In case of an antenna, the radiation resistance and loss resistance are not two different

quantities.b) The loss resistance includes loss by eddy currents, improper earth connections, insulation

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leakages etc) but not I2R lossesc) Radiation resistance varies directly as square root of the frequencyd) None of the above32. Ultraviolet radiation emitted when electron jumps from an outer stationary orbit to -.a) first stationary orbitb) second stationary orbitc) third stationary orbitd) fourth stationary orbit33. When the signal is propogated in a waveguide which has a full wave of electric intensitychange between the two farther walls and no component of the electric field in the direction ofpropogation then the mode is –a) TE11b) TE10c) TM22d) TE2034. Consider the following statements pertaining to parabolic antenna -1.It is commonly used above 1GHz2. It get’s circularly polarized3. It’s radiation pattern is highly directional4. It’s radiation pattern is cardiodof these statements-a) 1,2 and 4 are correctb) 1 and 3 are correctc) 1,2 and 3 are correctd) 2 and 4 are correct35. When a vertical dipole antenna is used in conjunction with a loop antenna for directionfinding, then the field pattern obtained will be-

36. When one end of a loss less transmission line of length 3/8 l and characteristic impedance R0is short circuited and the other end is terminated in Ro then the impedance at l/8 away from theend terminated in R0 is-a) Zerob) R0c) R0/2d) Infinite37. For transmission of wave from a dielectric permittivity Î1 into dielectric medium of lowerpermittivity Î2 (Î1 > Î2) the critical angle of incidence Qc ( relative to the interface ) is given by-

38. A transmission line has primary constants R, L, G and C and secondary constants Z0 and g (=a + jb) if the line is loss less then .

39. The intrinsic impedance of a free space is-

40. One of the following which is a low gain but omni directional antenna is-a) disconeb) log-periodicc) loopd) helical41. Electronic voltmeters have –a) high input impedance

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b) low input impedancec) zero input impedanced) none42. Which of the following statement about impulse voltage is true ?a) An impulse voltage is an unidirectional voltage.b) In chopped impulse voltage, flashover does not occur.c) Time taken to rise is exactly equal to the time taken to fall.d) RMS value of impulse voltage is always less than 50% of average value.43. The precision of an instrument indicates its ability to reproduce a certain reading with a given–a) driftb) resolutionc) shift.d) consistency44. In heterodyne digital conductor, the input signal is heterodyned to a –a) higher frequencyb) lower frequencyc) both a and b)d) none45. In a digital measuring device, if the input electrical signal is in the frequency range dc to fmaxHz, then it must be sampled at a rate of –a) fmax times/secb) fmax times/sesc) every 2fmax/secd) 2 fmax times/sec .46. Moving Iron intruments measures the rms value of –a) a direct quantityb) an alternating quantityc) a virtual quantity.d) none.47. One of the following intruments which is used almost exclusively to measure radio frequencycurrent is-a) Moving coil meterb) Rectifier-type moving coil meterc) Iron-vane meterd) Thermocouple meter.48. A good ohmic contact on a p- type semiconductor chip is formed by introducing –a) gold as an impurity below the contactb) a high concentration of donors below the contractc) a high concentration of acceptors below the contactd) a thin insulator layer between the metal and semiconductor.49. The use of thermocouple meters for ac measurement leads to a meterscale which is –a) linearb) square lawc) logarithmicd) exponential50. If low pressure of the order of 10-6mm of Hg is to be measure then the instrument of choicewould be-a) compound pressure gaugeb) thermocouple vacuum gaugec) pirani gauged) ionization type vacuum gaugeIn the given circuit if the power dissipated in the 6W resister is zero then V is –a)

51. The equivalent circuit of a resistor is shown in the given figure. The resistor will be noninductive if –

a)

b) c) d) 52. SCR turns OFF from conducting state to blocking state on –a) reducing gate currentb) reversing gate voltagec) reducing anode current below holding current valued) applying ac to the gate 53. Static V-I characteristics of an SCR with different gate drives applied to the gate are indicatedby-a) I92 > I 91 > I 90b) V92 > V91 > V90c) P92 > P91 > P90d) either a or b 54. Each diode of a 3 phase, 6-pulse bridge diode rectifier conducts for-

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a) 60o

b) 1200

c) 1800

d) 900

55. A load, consisting of R = 10W and wL = 10W is being fed from 230 V, 50 Hz source through a1 phase voltage controller. For a firing angle delay of 300 , the rms value of load current wouldbe- a) 23 A

56. The total number of SCRs conducting simultaneously in a 3 phase full converter with overlapconsidered has the sequence of-a) 3,3, 22b) 3, 3, 3, 2c) 3, 2, 3, 2d) 2, 2, 2, 3 57. A single phase voltage controller, using two SCRs in antiparallel is found to be operating as acontrolled rectifier. This is becausea) load is R and pulse gating is usedb) load is R and high frquendy carrier gating is usedc) load is RL and pulse gating is usedd) load is RL and continuous gating is used 58. The inverse Fourier Transform of

59. In a GTO anode current begins to fall when gate current-a) is negative peak at time t = 0b) is negative peak at t = shortage period tsc) just begins to become negative at t = 0d) is negative peak at t = (ts + fall time)60. Power amplifiers and Audio usea) Ferrite coreb) Air corec) Solid iron cored) Laminated iron core 61. The amplifiers which are inserted at intervals amplify the signal and compensate fortransmission less on the cable are called-a) Line amplifiersb) Equalizing amplifiersc) Rep eatersd) Compandors62. A solid state device named TRIAC acts as a ----- switcha) 3 terminal unidirectionalb) 2 terminal unidirectionalc) 3 terminal bi-directionald) 2 terminal bi-directional 63. Identify the fastest logic circuit when speed of operation is concerned-a) TTLb) RTL

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c) DTLd) ATL 64. An amplifier CE is characterized by-a) Low voltage gainb) Moderate power gainc) Very high output impedanced) Signal phase reversal 65. The standard symbol for EX-OR gate is –

a) b)

c) d) 66. Boolean algebra is based on –a) numbersb) logicc) truthd) symbols 67. Magnetic amplifiers are used for –a) voltage amplificationb) power amplificationc) current amplificationd) frequency amplification 68. Number of resistors required for an N bit D/A converter in R-2R ladder D/A converter is-a) 4Nb) 1Nc) 3Nd) 2N 69. 'Not allowed' condition in NAND gate SR flip flop is –a) s = 0, R = 0b) s = 1, R = 1c) s = 0, R = 1d) s = 1, R = 0 70. In a PID controlles the transfer function G(s) is

71. A time invariant linear stable system is forced with an input x(t) = A sin wt under steady stateconditions, the output Y(t) of the system will be –a) A sin (wt + f), where f = tan-1|G(jw) |b) A G (jw) | A sin [wt + G(jw)]c) | G (jw) | A sin [2 wt + G (jw)]d) | G (jw) A sin [wt + G (jw)] x(t)-------G(s)---------y(t) 72. Mark the wrong statement for two phase servo motor –a) The rotor diameter is smallb) The rotor resistance is lowc) The applied voltages are seldom balancedd) The torque speed characterstic are linear. 73. The gain phase plot of open loop transfer function of four different systems labelled A, B, C,and Dare shown in the figure. The correct sequence of the increasing order of stability of the foursystems will be-

a) A, B, C, Db) D, C, B, Ac) B, A, D, C,d) B, C, D, A

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74. A unity feedback system has G(S) = . In the loot locus, the break away pointoccurs betweena) S = 0 and –1b) S = -1 and ¥c) S = -1 and –2d) S =-2 and – ¥ 75. Twice in a year a few minute disturbance occurs in space communication during sun-blindingwhen --- are in linea) Sun and satelliteb) Sun and earth stationc) Satellite and earth stationd) Sun, satellite and earth station76. The traffic handling capacity of an Earth station on the up link depends on-a) It’s EIRPb) Satellite antenna gainc) Noise associated with the satellited) All of the above 77. A supergroup pilot is –a) applied at each multiplexing bayb) used to regulate the gain of individual repeatersc) applied at each adjustable equalizerd) fed in at a GTE 78. If the antenna diameter in a radar system is increased by a factor of 4, the maximum rangewill be increased by a factor ofa) Ö2b) 2c)

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