BSNL JTO EXAM PAPERS 2005

(PAPER) BSNL JTO Sample Test Paper

BSNL JTO Recruitment Test
0. If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is-
a) Triangularb) Trapezoidalc)) Sinusoidald) Rectangular
1. One of the following statement which is true for relative dielectric constant is -a) It is dimensionlessb) It is not equal to unity for vacuumc)) It?s value for all substances is less than oned)) None
2. Pure metals generally have-a) high conductivity and low temperature coefficientb) high conductivity and large temperature coefficientc) low conductivity and zero temperature coefficientd) low conductivity and high temperature coefficient
3. For small size, high frequency coils, the most common core material isa) Airb) Ferritec) Powdered iond) Steel
4. For an abrupt junction Varactor diode, the dependence of device capacitance (C) on applied reverse bias (V) is given by-a) C a V1/3b) C a V-1/3c) C a V1/2d) C a V-1/2

5. A superconductor is a-a) A material showing perfect conductivity and Meissner effect below a critical temperatureb) A conductor having zero resistancec) A perfect conductor with highest dimagnetic susceptibilityd) A perfect conductor which becomes resistive when the current density through it exceeds a critical value

6. When a semiconductor based temperature transducer has a temperature coefficient of ?2500 mV/0C then this transducer is indeed a-a) Thermistorb) Forward biased pn junction diodec) Reverse biased pn junction dioded) FET

7. The location of lightning arrestor is -a) Near the transformerb) Near the circuit breakerc) Away from the transformerd) None

8. Time constant of an RC circuit increases if the value of the resistance is -a) Increasedb) Decreasedc) Neither a nor bd) Both a and b

9. Intrinsic semiconductors are those which -a) Are available locallyb) Are made of the semiconductor material in its purest fromc) Have more electrons than holesd) Have zero energy gaps

10. The primary control on drain current in a JFET is exerted by -a) Channel resistanceb) Size of depletion regionsc) Voltage drop across channeld) Gate reverse bias

11. The electrical conductivity of metals which is expressed in ohm-1 m-1 is of the order of -a) 1010b) 105c) 10-4d) 10-6

12. When biased correctly, a zener diode ?a) acts as a fixed resistanceb) has a constant voltage across itc) has a constant current passing through itd) never overheats

13. The current amplification factor adc is given by ?a) IC/IEb) IC/IBc) IB/ICd) IB/IC

14. Compared to bipolars, FETs have-a) high input impedanceb) low input impedancec) same input impedanced) none

15. The source-drain channel of JFET is -a) ohmicb) bilateralc) unilaterald) both a and b

16. diac is equivalent to a -a) Pair of SCRsb) Pair of four layer SCRsc) Diode and two resistorsd) Triac width

17. When a sample of N type semiconductor has electron density of 6.25 ? 1011 /cm3 at 300K and if the intrinsic concentration of carriers in this sample is 2.5 ? 1013/cm3 then the hole density will be ?a) 106/cm3b) 103/ cm3c) 1010/ cm3d) 1012/ cm3

18. The statement 'In any network of linear impedances, the current flowing at any point is equal to the algebraic sum of the currents caused to flow at that point by each of the sources of emf taken separately with all other emf's reduced to zero? represents -a) Kirchhoff's lawb) Norton's theoremc) Thevenin's theoremd) Superposition theorem

19. One of the following modes which has the characteristics of attenuation becoming less as the frequency is increased and is attractive at icrowave frequencies of circular cylindrical wave guides is ?a) TE1 modeb) TM01 modec) TE01 moded) Higher order mode

20. A two-port network is symmetrical if ?a) z11z22 ? z12z21 = 1b) h11h22 ? h12h21 = 1c) AD ? BC = 1d) y11y22 ? y12y21 = 1

21. For transmission line load matching over a range of frequencies, it is best to use a-a) balunb) broad band directional couplerc) double stubd) single stub of adjustable position

22. The poles and zeros of a driving point function of a network are simple and interlace on the negative real axis with a pole closest to the origin. It can be realised -a) by an LC networkb) as an RC driving point impedancec) as an RC driving point admittanced) only by an RLC network

23. Poles and zeros of a driving point function of a network are simple and interlace on the jw axis. The network consists of elements ?a) R and Cb) L and Cc) R and Ld) R, L and C

24. For a two port reciprocal network, the output open circuit voltage divided by the input current is equal to ?a) Bb) Z12d) h12

25. In a short electric doublet the radiation properties are so that-a) The induction field diminishes as the square root of the distance and is only appreciable in the vicinity of the conductor.b) In the radiation, magnetic field is minimum when the current is maximum.c) The radiation resistance of a short doublet antenna is extremely high.d) Mean rate of power through a unit area of spherical sphere surrounding this doublet is proportional to the square of the elemental length, other factors remaining constant.

26. The frequency modulated (FM) radio frequency range is nearly -a) 250 ?300 MHzb) 150 ? 200 MHzc) 90 ? 105 MHzd) 30-70 MHz

27. In an underground cable the distortion in the transmission of carrier frequency can be eliminated by using -a) Inductive loadingb) Resistive loadingc) Capacitive loadingd) Shielding

28. The charachteristic impendance of a transmission line with inductance 0.294 mH /m and capacitance 60 pF/m is -a) 49 Wb) 60 Wc) 70 Wd) 140 W

30. For a quarter wavelength ideal transmission line of characteristic impedance 50 ohms and load impedance 100 ohms, the input impedance will be ?a) 25Wb) 50Wc) 100Wd) 150W

31. The depth of penetration or skin depth for an electromagnetic field of frequency ?f? in a conductor of resistivity r and permeability m is-a) inversely proportional to r and f and directly proportional to mb) directly proportional to r and inversely proportional to f and mc) directly proportional to f and inversely proportional to r and md) inversely proportional to r and m and directly proportional to f

32. When an antenna has a gain of 44dB then assuming that the main beam of the antenna is circular in cross-section the beam width will be -a) 0.4456 0b) 1.44560c) 2.44560d) 3.44560

33. Lens antennas used for microwaves are usually made of -a) Polystyreneb) Glass of low refractive indexc) Paraboloid surfacesd) Dielectric media having large refractive index

34. One of the following types of instrument which is an electrometer is -a) Electrodynamometerb) PMMCc) Electrostaticd) Moving iron

35. When an ac current of 5A and dc current of 5A flow simultaneously through a circuit then which of the following statement is true ?a) An ac ammeter will read less than 10A but more than 5Ab) An ac ammeter will read only 5Ac) A dc ammeter will read 10Ad) A dc ammeter will read zero

36. When Q factor of a circuit is high, then -a) power factor of the circuit is highb) impedance of the circuit is highc) bandwidth is larged) none of these

37. The resolution of a logic analyser is -a) the maximum number of input channelsb) the minimum duration of the glitch it can capturec) it's internal clock periodd) the minimum amplitude of input signal it can display

38. A memoryless system is ?a) causalb) not causalc) nothing can be saidd) none

39. An air capacitor is a ?a) time variantb) active devicec) time invariantd) time invariant and passive device

40. Thermistors are made of -a) pure metalsb) pure insulatorsc) sintered mixtures of metallic oxidesd) pure semiconductor

41. Pirani gauge is used to measure ?a) very low pressuresb) high pressuresc) pressures in the region of 1 atmd) fluid flow

42. These circuits converts input power at one frequency to output power at a different frequency through one stage conversion ?a) AC voltage controllersb) Cyclo convertersc) Phase controlled rectifiersd) Inverters
43. In a forward voltage Triggering thyristor changes from ?a) off state to on stateb) on state to off statec) on state to on stated) off state to off state

44. A thyristor, when triggered, will change from forward blocking state to conduction state if its anode to cathode voltage is equal to -a) peak repetitive off state forward voltageb) peak working off state forward voltagec) peak working off state reverse voltaged) peak non-repetitive off state forward voltage

45. Gate characteristic of a thyristor-a) is a straight line passing through originb) is of the type Vg = a + bIgc) is a curve between Vg and Igd) has a spread between two curves of Vg ? Ig

46. A four quadrant operation requires-a) two full converters in seriesb) two full converters connected back to backc) two full converters connected in paralleld) two semi converters connected back to back

47. If for a single phase half bridge inverter, the amplitude of output voltage is Vs and the output power is P, then their corresponding values for a single phase full bridge inverter are ?a) Vs, Pb) Vs/2, Pc) 2Vs, 2Pd) 2Vs, P

48. In an enhancement type MOSFET the output V-I characteristics has ?a) only an ohmic regionb) only a saturation regionc) only ohmic region at 10 W voltage value followed by a saturation region at higher voltagesd)an ohmic region at large voltage values preceded by a saturation region at lower voltages

49. The energy gap in a semiconductor -a) increases with temperatureb) remains constantc) slightly increase with temperatured) decrease with temperature

50. In an electronic circuit matching means -a) connecting a high impedance directly to low impedanceb) selection of components which are compatiblec) transferring maximum amount of signal between different kinds of circuits.d) RC coupled stages

51. P channel FETs are less superior than N channel FETs becausea) They have higher input impedanceb) They have high switching timec) They consume less powerd) Mobility of electrons is greater than that of holes

52. Small increase in temperature in the CE connected transistor is the -a) Increase in ICEOb) Increase in ac current gainc) Decrease in ac current gaind) Increase in output resistance

53. An amplifier has a band width of 20 KHz and a midband gain of 50 without feedback. If a negative feedback of 1% is applied then bandwidth with feedback is -a) 13. 3 KHzb) 30KHzc) 10KHzd) 40KHz

54. The output of a class B amplifier -a) is distortion freeb) consists of positive half cycles onlyc) is like the output of a full wave rectifierd) comprises short duration current pulses

55. An amplifier with negative feedback -a) lowers its lower 3 dB frequencyb) raises its upper 3 dB frequencyc) increases its bandwidthd) all of the above

56. What changes would be necessary in block C if FM signals are to be received -a) Block becomes redundantb) A FM detector would be requiredc) A high frequency signal generatord) An additional local oscillator will be needed

57. The main disadvantage of Diode-Transistor logic (DTL) is its-a) greater speedb) slower speedc) average speedd) none of the above

58. Time delay Dt in digital signals in an SIS O shift register is given by ?a) Dt = N ? Fcb) Dt = N ? 1/Fcc) Dt = 1/N ? Fcd) Dt = N ? 1/Fc

59. The output Qn is 1 in a JK flip flop and it does not change when clock pulse is applied) The possible combination of Jn and Kn can be ?(y denotes don't care)a) y and 0b) y and 1c) 0 and yd) 1 and y

60. Basic memory cell of dynamic RAM consists of ?a) a flip flopb) a transistor acting as a capacitorc) a transistord) a capacitance

61. The 2's complement of 10002 is ?a) 0111b) 0101c) 1000d) 000162. Master slave flip-flop is made up of ?a) two flip flops connected in seriesb) two flip flops connected in parallelc) a debouncer circuitd) a-D- latch

63. Number of nybbles making one byte is ?a) 2b) 4c) 8d) 16

64. The intrinsic impedance of free space-a) is independent of frequencyb) decreases with increase of frequencyc) increases with increase of frequencyd) varies as square root of frequency

65. A system consists of 12 poles and 2 zeroes. Its high frequency asymptote in its magnitude plot has a slope of -a) ?200 dB/decadeb) ?240 dB/decadec) ?230 dB/decaded) ?320 dB/decade

66. Considering the conditions-1. High loop gain 2. Less ringing3. Greater damping 4 Negative dB gain marginSystem stability requirements would includea) 1 and 3b) 1, 2 and 3c) 1 and 4d) 2, 3 and 4

67. In the equatorial plane only Geosychronous satellite are launched because it is the only plane which provides ?a) 24 hour orbitb) stationary satellitec) global communicationd) zero-gravity environs

68. Radio Broadcasting is an example of ?a) space multiplexingb) time multiplexingc) frequency multiplexingd) none of the above

69. PAM signals can be demodulation by using a ?a) Low pass filters (LPE) aloneb) A Schmitt trigger followed by a LPFc) A differentiator followed by a LPFd) A clipper circuit by a LPF

70. In an FDM receiver channels can be separated by using ?a) AND gatesb) Band passc) differentiationd) Integration

71. The most common modulation system used for telegraphy is-a) frequency shift keyingb) two ? tone modulationc) pulse code modulationd) single tone modulation

72. Use of varoctor diode in generation of modulated segial be-a) FM generation onlyb) 100AM generation onlyc) PM generation onlyd) both PM and AM generation

73. In colour picture tube shadow mask is used to-a) reduce x-ray emissionb) ensure that each beam strikes only its own dotsc) increase screen brightnessd) provide degaussing for the screen

74. The circuit that separates composite video warefore from the sync pulses is-a) the keyed AGC amplifarb) a clipperc) an integratord) a sawtooth current

75. Band width of microwaves is-a) 1GHz -103 GHzb) 1GHz ?100 GHzc) 1 GHz ?10 GHzd) 1 GHz ? 106 GHz

76. In transverse Magnetic mode-a) no electric line is in direction of propagationb) no magnetic line is in direction of propagationc) bath magnetic & electric lines are is direction of propagationd) neither magnetic nor electric lines in direction of propagation

77. Signal transmission in sky wave propagation is due to ?a) Reforction of waveb) Reflection of wavec) Pierus through Inosphered) None

78. According to Barkhausen Criterion Phase shift of signal should be ?a) 600b) 900c) 1800d) 3600

79. The transmission does not have -a) Partition noiseb) Flicker noisec) resistanced) Short noise

80. Varoctor diode has non linearity of -a) capacitanceb) Inductancec) Resistanced) Is a linear device
81. Noise figure is calculated as ?a) i/p signal to noise ratio X o/p signal to noise ratiob) i/p S/N Ratio / O/P S/N Ratioc) i/p S/N Ratio / O/P S/N Ratio X 100d) i/p S/N Ratio + O/P S/N Ratio

82. You can determine quickly the effect of adding poles and zeros by ?a) Nicholas chartb) Nyquist plotc) Bode plotd) Root locus.

83. The polar plot of G(S) = intercepts real axis at w = wo. Then, the real part and wo are given by-a) ?5, 1b) ?2.5, 1c) ?5,0-5d) ?5, 2

84. Laplace transform F (s) of a function f (E) is given byThe initial and final values of F (t) will be respectively-a) zero and 1b) zero and 10c) 10 and zerod) 70 and 80

85. A satellite link uses different frequencies for receiving and transmitting in order to ?a) avoid interference from terrestrial microwave linksb) avoid interference between its powerful transmitted signals and weak in coming signalc) minimize free-space lossesd) maximize antenna gain

86. The first determining factor in selecting a satellite system is its-a) EIRPb) Antenna sizec) Coverage aread) Antenna gain

87. Equalizing pulses in TV are sent during-a) horizontal blankingb) vertical blankingc) the serrationsd) the horizontal retrace

88. The son seems to have -------- from his father a somewhat gloomy and moody manner-a) washedb) inheritedc) admiredd) attempt

60. Basic memory cell of dynamic RAM consists of ?a) a flip flopb) a transistor acting as a capacitorc) a transistord) a capacitance

61. The 2's complement of 10002 is ?a) 0111b) 0101c) 1000d) 000162. Master slave flip-flop is made up of ?a) two flip flops connected in seriesb) two flip flops connected in parallelc) a debouncer circuitd) a-D- latch

63. Number of nybbles making one byte is ?a) 2b) 4c) 8d) 16

64. The intrinsic impedance of free space-a) is independent of frequencyb) decreases with increase of frequencyc) increases with increase of frequencyd) varies as square root of frequency

65. A system consists of 12 poles and 2 zeroes. Its high frequency asymptote in its magnitude plot has a slope of -a) ?200 dB/decadeb) ?240 dB/decadec) ?230 dB/decaded) ?320 dB/decade

66. Considering the conditions-1. High loop gain 2. Less ringing3. Greater damping 4 Negative dB gain marginSystem stability requirements would includea) 1 and 3b) 1, 2 and 3c) 1 and 4d) 2, 3 and 4

67. In the equatorial plane only Geosychronous satellite are launched because it is the only plane which provides ?a) 24 hour orbitb) stationary satellitec) global communicationd) zero-gravity environs

68. Radio Broadcasting is an example of ?a) space multiplexingb) time multiplexingc) frequency multiplexingd) none of the above

69. PAM signals can be demodulation by using a ?a) Low pass filters (LPE) aloneb) A Schmitt trigger followed by a LPFc) A differentiator followed by a LPFd) A clipper circuit by a LPF

70. In an FDM receiver channels can be separated by using ?a) AND gatesb) Band passc) differentiationd) Integration

71. The most common modulation system used for telegraphy is-a) frequency shift keyingb) two ? tone modulationc) pulse code modulationd) single tone modulation

72. Use of varoctor diode in generation of modulated segial be-a) FM generation onlyb) 100AM generation onlyc) PM generation onlyd) both PM and AM generation

73. In colour picture tube shadow mask is used to-a) reduce x-ray emissionb) ensure that each beam strikes only its own dotsc) increase screen brightnessd) provide degaussing for the screen

74. The circuit that separates composite video warefore from the sync pulses is-a) the keyed AGC amplifarb) a clipperc) an integratord) a sawtooth current

75. Band width of microwaves is-a) 1GHz -103 GHzb) 1GHz ?100 GHzc) 1 GHz ?10 GHzd) 1 GHz ? 106 GHz

76. In transverse Magnetic mode-a) no electric line is in direction of propagationb) no magnetic line is in direction of propagationc) bath magnetic & electric lines are is direction of propagationd) neither magnetic nor electric lines in direction of propagation

77. Signal transmission in sky wave propagation is due to ?a) Reforction of waveb) Reflection of wavec) Pierus through Inosphered) None

78. According to Barkhausen Criterion Phase shift of signal should be ?a) 600b) 900c) 1800d) 3600

79. The transmission does not have -a) Partition noiseb) Flicker noisec) resistanced) Short noise

80. Varoctor diode has non linearity of -a) capacitanceb) Inductancec) Resistanced) Is a linear device

81. Noise figure is calculated as ?a) i/p signal to noise ratio X o/p signal to noise ratiob) i/p S/N Ratio / O/P S/N Ratioc) i/p S/N Ratio / O/P S/N Ratio X 100d) i/p S/N Ratio + O/P S/N Ratio

82. You can determine quickly the effect of adding poles and zeros by ?a) Nicholas chartb) Nyquist plotc) Bode plotd) Root locus.

83. The polar plot of G(S) = intercepts real axis at w = wo. Then, the real part and wo are given by-a) ?5, 1b) ?2.5, 1c) ?5,0-5d) ?5, 2

84. Laplace transform F (s) of a function f (E) is given byThe initial and final values of F (t) will be respectively-a) zero and 1b) zero and 10c) 10 and zerod) 70 and 80

85. A satellite link uses different frequencies for receiving and transmitting in order to ?a) avoid interference from terrestrial microwave linksb) avoid interference between its powerful transmitted signals and weak in coming signalc) minimize free-space lossesd) maximize antenna gain

86. The first determining factor in selecting a satellite system is its-a) EIRPb) Antenna sizec) Coverage aread) Antenna gain

87. Equalizing pulses in TV are sent during-a) horizontal blankingb) vertical blankingc) the serrationsd) the horizontal retrace

88. The son seems to have -------- from his father a somewhat gloomy and moody manner-a) washedb) inheritedc) admiredd) attempt

89. Essayist works with words as sculptor with-a) waterb) stonec) aird) hills

90. What is a collection of sheep called ?a) bunchb) flockc) herdd) comet

91. Join these sentences meaningfully by choosing the correct alternative from the following :You can buy a book. You can read it.a) andb) norc) eitherd) neither

92. What is the opposite of Asperity ?a) gentilityb) superiorityc) kindnessd) clarity

93. The Election Commission functions under-a) Ministry of Home Affairsb) Ministry of Lawc) Prime Minister's Secretariatd) None of these

94. Article 352 of Indian Constitution needs to be revoked in case-a) President's Rule is to be imposedb) Emergency is declaredc) Services of a Government servant are to be terminated without any enquiryd) A political party of national level is to be banned

95. Radio-activity was first discovered by-a) Becquerelb) Madam Curiec) Rutherfordd) Jenner

96. Ninth Plan in India ranges from-a) 1995-2000b) 1996-2001c) 1997-2002d) 1998-2003

97. How much electricity does India propose to generate through nuclear power by the year 2000 AD?a) 5,000 MWb) 10,000 MWc) 15,000 MWd) 20,000 MW

98. In which year did the fall of Bastille take place?a) 1769b) 1789c) 1889d) 1869

99. To form a quorum how many members of the Lok Sabha or Rajya Sabha should be present?a) 1/10th of total membershipb) 1/6th of total membershipc) 1/4th of total membershipd) 1/5th of total membership

100. How may countries are non-permanent members of the Security Council?a) 6b) 7c) 9d) 10

101. The International Date Line is represented by-a) 1000 meridianb) 00 meridianc) 1800 meridiand) 900 meridian

102. India's first satellite was launched from-a) Sriharikotab) Cape Kennedyc) Bangalored) A Soviet cosmodrome


103. Name the author of the famous book "Politics"-a) Aristotleb) Socratesc) Platod) None of them

104. "Guernica" is Picasso's painting on-a) The Spanish Civil Warb) The American Civil Warc) The French Revolutiond) The Russian Revolution


105. The object of the Supreme Court's Keshvanand Bharati ruling is -a) To put a limit on Parliament's amendatory powersb) To give unlimited powers to Parliament to amend the Constitutionc) To give precedence to Directive Principles over Fundamental Rightsd) None of these

106. Which country in July '99 officially announced mastering of indigenously developed neutron bomb technology?a) N. Koreab) Francec) Indiad) China

107. Shifting cultivation is commonly used in which of the following states?a) Tamil Nadub) Maharashtrac) Jammu and Kashmird) Nagaland