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BSNL JTO (Junior Telecom Officers) Examination Question Paper - Part - 2

Posted By : Kalidoss Rating : +14, -4
BSNL JTO (Junior Telecom Officers) Examination Question Paper - Part - 2
BSNL Recruitment of Junior Telecom Officers (Telecom.), Junior Telecom Officers (Civil) and Junior Telecom Officers (Electrical) Previous Year Question Papers.

51. P channel FETs are less superior than N channel FETs because
  a) They have higher input impedance
  b) They have high switching time
  c) They consume less power
  d) Mobility of electrons is greater than that of holes


52. Small increase in temperature in the CE connected transistor is the -
  a) Increase in ICEO
  b) Increase in ac current gain
  c) Decrease in ac current gain
  d) 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 KHz
  b) 30KHz
  c) 10KHz
  d) 40KHz


54. The output of a class B amplifier -
  a) is distortion free
  b) consists of positive half cycles only
  c) is like the output of a full wave rectifier
  d) comprises short duration current pulses


55. An amplifier with negative feedback -
  a) lowers its lower 3 dB frequency
  b) raises its upper 3 dB frequency
  c) increases its bandwidth
  d) all of the above


56. What changes would be necessary in block C if FM signals are to be received -
  a) Block becomes redundant
  b) A FM detector would be required
  c) A high frequency signal generator
  d) An additional local oscillator will be needed


57. The main disadvantage of Diode-Transistor logic (DTL) is its-
  a) greater speed
  b) slower speed
  c) average speed
  d) none of the above


58. Time delay Dt in digital signals in an SIS O shift register is given by ?
  a) Dt = N ? Fc
  b) Dt = N ? 1/Fc
  c) Dt = 1/N ? Fc
  d) 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 0
  b) y and 1
  c) 0 and y
  d) 1 and y


60. Basic memory cell of dynamic RAM consists of ?
  a) a flip flop
  b) a transistor acting as a capacitor
  c) a transistor
  d) a capacitance


61. The 2's complement of 10002 is ?
  a) 0111
  b) 0101
  c) 1000
  d) 0001


62. Master slave flip-flop is made up of ?
  a) two flip flops connected in series
  b) two flip flops connected in parallel
  c) a debouncer circuit
  d) a-D- latch


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


64. The intrinsic impedance of free space-
  a) is independent of frequency
  b) decreases with increase of frequency
  c) increases with increase of frequency
  d) 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/decade
  b) ?240 dB/decade
  c) ?230 dB/decade
  d) ?320 dB/decade


66. Considering the conditions-
  1. High loop gain 2. Less ringing
  3. Greater damping 4 Negative dB gain margin
  System stability requirements would include
  a) 1 and 3
  b) 1, 2 and 3
  c) 1 and 4
  d) 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 orbit
  b) stationary satellite
  c) global communication
  d) zero-gravity environs


68. Radio Broadcasting is an example of ?
  a) space multiplexing
  b) time multiplexing
  c) frequency multiplexing
  d) none of the above


69. PAM signals can be demodulation by using a ?
  a) Low pass filters (LPE) alone
  b) A Schmitt trigger followed by a LPF
  c) A differentiator followed by a LPF
  d) A clipper circuit by a LPF


70. In an FDM receiver channels can be separated by using ?
  a) AND gates
  b) Band pass
  c) differentiation
  d) Integration


71. The most common modulation system used for telegraphy is-
  a) frequency shift keying
  b) two ? tone modulation
  c) pulse code modulation
  d) single tone modulation


72. Use of varoctor diode in generation of modulated segial be-
  a) FM generation only
  b) 100AM generation only
  c) PM generation only
  d) both PM and AM generation


73. In colour picture tube shadow mask is used to-
  a) reduce x-ray emission
  b) ensure that each beam strikes only its own dots
  c) increase screen brightness
  d) provide degaussing for the screen


74. The circuit that separates composite video warefore from the sync pulses is-
  a) the keyed AGC amplifar
  b) a clipper
  c) an integrator
  d) a sawtooth current


75. Band width of microwaves is-
  a) 1GHz -103 GHz
  b) 1GHz ?100 GHz
  c) 1 GHz ?10 GHz
  d) 1 GHz ? 106 GHz


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


77. Signal transmission in sky wave propagation is due to ?
  a) Reforction of wave
  b) Reflection of wave
  c) Pierus through Inosphere
  d) None


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


79. The transmission does not have -
  a) Partition noise
  b) Flicker noise
  c) resistance
  d) Short noise


80. Varoctor diode has non linearity of -
  a) capacitance
  b) Inductance
  c) Resistance
  d) Is a linear device


81. Noise figure is calculated as ?
  a) i/p signal to noise ratio X o/p signal to noise ratio
  b) i/p S/N Ratio / O/P S/N Ratio
  c) i/p S/N Ratio / O/P S/N Ratio X 100
  d) 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 chart
  b) Nyquist plot
  c) Bode plot
  d) 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, 1
  b) ?2.5, 1
  c) ?5,0-5
  d) ?5, 2


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


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


86. The first determining factor in selecting a satellite system is its-
  a) EIRP
  b) Antenna size
  c) Coverage area
  d) Antenna gain


87. Equalizing pulses in TV are sent during-
  a) horizontal blanking
  b) vertical blanking
  c) the serrations
  d) the horizontal retrace


88. The son seems to have """ from his father a somewhat gloomy and moody manner-
  a) washed
  b) inherited
  c) admired
  d) attempt


60. Basic memory cell of dynamic RAM consists of ?
  a) a flip flop
  b) a transistor acting as a capacitor
  c) a transistor
  d) a capacitance


61. The 2's complement of 10002 is ?
  a) 0111
  b) 0101
  c) 1000
  d) 0001


62. Master slave flip-flop is made up of ?
  a) two flip flops connected in series
  b) two flip flops connected in parallel
  c) a debouncer circuit
  d) a-D- latch


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


64. The intrinsic impedance of free space-
  a) is independent of frequency
  b) decreases with increase of frequency
  c) increases with increase of frequency
  d) 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/decade
  b) ?240 dB/decade
  c) ?230 dB/decade
  d) ?320 dB/decade


66. Considering the conditions-
  1. High loop gain 2. Less ringing
  3. Greater damping 4 Negative dB gain margin
  System stability requirements would include
  a) 1 and 3
  b) 1, 2 and 3
  c) 1 and 4
  d) 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 orbit
  b) stationary satellite
  c) global communication
  d) zero-gravity environs


68. Radio Broadcasting is an example of ?
  a) space multiplexing
  b) time multiplexing
  c) frequency multiplexing
  d) none of the above


69. PAM signals can be demodulation by using a ?
  a) Low pass filters (LPE) alone
  b) A Schmitt trigger followed by a LPF
  c) A differentiator followed by a LPF
  d) A clipper circuit by a LPF


70. In an FDM receiver channels can be separated by using ?
  a) AND gates
  b) Band pass
  c) differentiation
  d) Integration


71. The most common modulation system used for telegraphy is-
  a) frequency shift keying
  b) two ? tone modulation
  c) pulse code modulation
  d) single tone modulation


72. Use of varoctor diode in generation of modulated segial be-
  a) FM generation only
  b) 100AM generation only
  c) PM generation only
  d) both PM and AM generation


73. In colour picture tube shadow mask is used to-
  a) reduce x-ray emission
  b) ensure that each beam strikes only its own dots
  c) increase screen brightness
  d) provide degaussing for the screen


74. The circuit that separates composite video warefore from the sync pulses is-
  a) the keyed AGC amplifar
  b) a clipper
  c) an integrator
  d) a sawtooth current


75. Band width of microwaves is-
  a) 1GHz -103 GHz
  b) 1GHz ?100 GHz
  c) 1 GHz ?10 GHz
  d) 1 GHz ? 106 GHz


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


77. Signal transmission in sky wave propagation is due to ?
  a) Reforction of wave
  b) Reflection of wave
  c) Pierus through Inosphere
  d) None


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


79. The transmission does not have -
  a) Partition noise
  b) Flicker noise
  c) resistance
  d) Short noise


80. Varoctor diode has non linearity of -
  a) capacitance
  b) Inductance
  c) Resistance
  d) Is a linear device


81. Noise figure is calculated as ?
  a) i/p signal to noise ratio X o/p signal to noise ratio
  b) i/p S/N Ratio / O/P S/N Ratio
  c) i/p S/N Ratio / O/P S/N Ratio X 100
  d) 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 chart
  b) Nyquist plot
  c) Bode plot
  d) 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, 1
  b) ?2.5, 1
  c) ?5,0-5
  d) ?5, 2


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


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


86. The first determining factor in selecting a satellite system is its-
  a) EIRP
  b) Antenna size
  c) Coverage area
  d) Antenna gain


87. Equalizing pulses in TV are sent during-
  a) horizontal blanking
  b) vertical blanking
  c) the serrations
  d) the horizontal retrace


88. The son seems to have """ from his father a somewhat gloomy and moody manner-
  a) washed
  b) inherited
  c) admired
  d) attempt


89. Essayist works with words as sculptor with-
  a) water
  b) stone
  c) air
  d) hills


90. What is a collection of sheep called ?
  a) bunch
  b) flock
  c) herd
  d) comet


91. Join these sentences meaningfully by choosing the correct alternative from the following :
  You can buy a book. You can read it.
  a) and
  b) nor
  c) either
  d) neither


92. What is the opposite of Asperity ?
  a) gentility
  b) superiority
  c) kindness
  d) clarity


93. The Election Commission functions under-
  a) Ministry of Home Affairs
  b) Ministry of Law
  c) Prime Minister's Secretariat
  d) None of these


94. Article 352 of Indian Constitution needs to be revoked in case-
  a) President's Rule is to be imposed
  b) Emergency is declared
  c) Services of a Government servant are to be terminated without any enquiry
  d) A political party of national level is to be banned


95. Radio-activity was first discovered by-
  a) Becquerel
  b) Madam Curie
  c) Rutherford
  d) Jenner


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


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


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


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


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


101. The International Date Line is represented by-
  a) 1000 meridian
  b) 00 meridian
  c) 1800 meridian
  d) 900 meridian


102. India's first satellite was launched from-
  a) Sriharikota
  b) Cape Kennedy
  c) Bangalore
  d) A Soviet cosmodrome


103. Name the author of the famous book "Politics¯-
  a) Aristotle
  b) Socrates
  c) Plato
  d) None of them


104. "Guernica¯ is Picasso's painting on-
  a) The Spanish Civil War
  b) The American Civil War
  c) The French Revolution
  d) The Russian Revolution


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


106. Which country in July '99 officially announced mastering of indigenously developed neutron bomb technology?
  a) N. Korea
  b) France
  c) India
  d) China


107. Shifting cultivation is commonly used in which of the following states?
  a) Tamil Nadu
  b) Maharashtra
  c) Jammu and Kashmir
  d) Nagaland


108. If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is-
  a) Triangular
  b) Trapezoidal
  c)) Sinusoidal
  d) Rectangular



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