BSNL Junior Telecom Officers’ (JTO) Recruitment Exam Question Paper-2014

Section-I Engineering Stream

1. If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is

(A) Triangular

(B) Trapezoidal

(D) Rectangular.

Answer: (D)

2. One of the following statement which is true for relative dielectric constant is

(A) it is dimensionless

(B) it is not equal to unity for vacuum

(D) none of these

Answer: (A)

3. Pure metals generally have

(A) high conductivity and low temperature coefficient

(B) high conductivity and large temperature coefficient

(D) low conductivity and high temperature coefficient

Answer: (B)

4. For small size, high frequency coils, the most common core material is

(A) Air

(B) Ferrite

(D) Steel

Answer: (A)

5. For an abrupt junction Varactor diode, the dependence of device capacitance (C) on applied reverse bias (V) is given by

(A) C ∝ V^1/3

(B) C ∝ V^−1/3

(D) C ∝ V⁻^1/2

Answer: (B)

6. A superconductor is a

(A) material showing perfect conductivity and Meissner effect below a critical temperature

(B) conductor having zero resistance

(D) perfect conductor which becomes resistive when the current density through it exceeds a critical value

Answer: (A)

7. When a semiconductor based temperature transducer has a temperature coefficient of −2500 mV/℃ then this tranducer is indeed a

(A) Thermistor

(B) Forward biased pn junction diode

(D) FET

Answer: (B)

8. The location of lightning arrestor is

(A) near the transformer

(B) near the circuit breaker

(D) None

Answer: (A)

9. Time constant of an RC circuit increases if the value of the resistance is

(A) increased

(B) decreased

(D) both (A) and (B)

Answer: (A)

10. Intrinsic semiconductors are those which

(A) are available locally

(B) are made of the semiconductor material in its purest from

(D) have zero energy gaps

Answer: (B)

11. The primary control on drain current in a JPFET is exerted by

(A) Channel resistance

(B) Size of depletion regions

(D) Gate reverse bias

Answer: (D)

12. The electrical conductivity of metals which is expressed in ohm⁻¹ m⁻¹ is of the order of

(A) 10¹⁰

(B) 10⁵

(D) 10⁻⁶

Answer: (B)

13. When biased correctly, a zener diode –

(A) acts as a fixed resistance

(B) has a constant voltage across it

(D) never overheats

Answer: (B)

14. The current amplification factor α_de is given by –

(A) I_C/I_E

(B) I_C/I_B

(D) I_B/I_C

Answer: (A)

15. Compared to bipolar, FETs have-

(A) high input impedance

(B) low input impedance

(D) none

Answer: (A)

16. The source-drain channel of JFET is

(A) ohmic

(B) bilateral

(D) both (A) and (B)

Answer: (D)

17. Diac is equivalent to a

(A) pair of SCRs

(B) pair of four layer SCRs

(D) Triac width

Answer: (B)

18. When a sample of N type semiconductor has electron density of 6.25 × 10¹⁸/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/cm³

(B) 10⁷/cm³

(D) 10¹²/cm³

Answer: (B)

19. 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 law

(B) Norton’s theorem

(D) Superposition theorem

Answer: (D)

20. One of the following modes which has the characteristics of attenuation becoming less as he frequency is increased and is attractive at microwave frequencies of circular cylindrical wave guides is-

(A) TE₁mode

(B) TM₀₁ mode

(D) Higher order mode

Answer: (C)

21. A two-port network is symmetrical if –

(A) z₁₁z₂₂ – z₁₂z₂₁ = 1

(B) h₁₁h₂₂ – h₁₂h₂₁ = 1

(D) y₁₁y₂₂ – y₁₂y₂₁ = 1

Answer: (C)

22. For transmission line load matching over a range of frequencies, it is best to use a

(A) balun

(B) broad band directional coupler

(D) single stub of adjustable position

Answer: (C)

23. 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 realized.

(A) by an LC network

(B) as an RC driving point impedance

(D) only by an RLC network

Answer: (D)

24. 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 C

(B) L and C

(D) R, L and C

Answer: (B)

25. For a two point reciprocal network, the output open circuit voltage divided by the input current is equal to-

(A) B

(B) Z₁₂

(D) h₁₂

Answer: (B)

26. 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.

(D) mean rate of power through a u nit area of spherical sphere surrounding this doublet is proportional to the square of the elemental length, other factors remaining constant.

Answer: (D)

27. The frequency modulated (FM) radio frequency range is nearly

(A) 250 – 300 MHz

(B) 150 – 20 MHz

(D) 30 -70 MHz

Answer: (C)

28. In an underground cable the distortion in the transmission of carrier frequency can be eliminated by using

(A) Inductive loading

(B) Resistive loading

(D) Shielding

Answer: (A)

29. The characteristic impedance of a transmission line with inductance 0.294 mH/m and capacitance 60 pM/m is

(A) 49 W

(B) 60 W

(D) 140 W

Answer: (C)

30. For a quarter wavelength ideal transmission line of characteristic impedance 50 ohms and load impedance 100 ohms, the input impedance will be a-

(A) 25W

(B) 50W

(D) 150W

Answer: (A)

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 m

(B) directly proportional to r and inversely proportional to f and m

(D) inversely proportional to r and m and directly proportional to f

Answer: (B)

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) 0.44560

(B) 1.44560

(D) 3.44560

Answer: (C)

33. Lens antennas used for microwaves are usually made of

(A) Polystyrene

(B) Glass of low refractive index

(D) Dielectric media having large refractive index

Answer: (A)

34. One of the following types of instrument which is an electrometer is-

(A) Electrodynamometer

(B) PMMC

(D) Moving iron

Answer: (C)

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 5A

(B) An ac ammeter will read only 5A

(D) A dc ammeter will read zero

Answer: (A)

36. When Q factor of a circuit is high, then

(A) power factor of the circuit is high

(B) impedance of the circuit is high

(D) more narrow bandwidth

Answer: (D)

37. The resolution of a logic analyser is

(A) the maximum number of input channels

(B) the minimum duration of the glitch it can capture

(D) the minimum amplitude of input signal it can display

Answer: (D)

38. A memoryless system is a-

(A) causal

(B) not causal

(D) none

Answer: (A)

39. An air capacitor is a-

(A) time variant

(B) active device

(D) time invariant and passive device

Answer: (D)

40. Thermistors are made of

(A) pure metals

(B) pure insulators

(D) pure semiconductor

Answer: (C)

41. Pirani gauge is used to measure-

(A) very low pressures

(B) high pressures

(D) fluid flow

Answer: (A)

42. These circuits converts input power at one frequency to output power at a different frequency through one stage conversion –

(A) AC Voltage controllers

(B) Cyclo converters

(D) Inverters

Answer: (B)

43. In a forward voltage triggering thyri9stor changes from-

(A) OFF state to ON state

(B) ON state to OFF state

(D) OFF state to OFF state

Answer: (A)

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 of forward voltage

(B) peak working off state forward voltage

(D) peak non-repetitive off state forward voltage

Answer: (B)

45. Gate characteristic of a thyristor –

(A) is a straight line passing through origin

(B) is of the type V_g = a + bI_g

(D) has a spread between two curves of V_g – I_g

Answer: (D)

46. A four quadrant operation requires –

(A) two full converters in series

(B) two full converters connected back to back

(D) two semi converters connected back to back

Answer: (B)

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) V_s, P

(B) V_s/2, P

(D) 2V_s, P

Answer: (C)

48. In an enhancement type MOSFET the output V-I characteristics has-

(A) only an ohmic region

(B) only a saturation region

(D) an ohmic region at large voltage values preceded by a saturation region at lower voltages

Answer: (C)

49. The energy gap in a semiconductor

(A) increases with temperature

(B) remains constant

(D) decreases with temperature

Answer: (D)

50. In an electronic circuit matching means

(A) connecting a high impedance directly to low impedance

(B) selection of components which are compatible

(D) C coupled stages

Answer: (C)

Section – II Engineering Stream

51. P channel FETs are less superior than N channel FETs because

(A) they have higher input impedance

(B) they have high switching time

(D) mobility of electrons is greater than that of holes

Answer: (D)

52. Small increase in temperature in the CE connected transistor is the

(A) increase in I_CEO

(B) increase in ac current gain

(D) increase in output resistance

Answer: (A)

53. An amplifier has 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) 30 KHz

(D) 40 KHz

Answer: (B)

54. The output of a class B amplifier

(A) is distortion free

(B) consist of positive half cycles only

(D) comprises short duration current pulses

Answer: (B)

55. An amplifier with negative feedback

(A) lowers its lower 3 dB frequency

(B) raises its upper 3 dB frequency

(D) all of the above

Answer: (D)

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

(D) an additional local oscillator will be needed

Answer: (B)

57. The main disadvantage of Diode-Transistor logic (DTL) is its –

(A) greater speed

(B) slower speed

(D) none of the above

Answer: (B)

58. Time delay ∆t in digital signals in an SISO shift register is given by

(A) ∆t = N × F_e

(B) ∆t = N × 1/F_e

(D) ∆t = N – 1/F_e

Answer: (B)

59. The output Q_n is 1 in a JK flip 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

(D) 1 and y

Answer: (A)

60. Basic memory cell of dynamic RAM consists of –

(A) a flip flop

(B) a transistor acting as a capacitor

(D) a capacitance

Answer: (B)

61. The 2’s complement of 1000₂ is-

(A) 0111

(B) 0101

(D) 0001

Answer: (C)

62. Master slave flip-flop is made up of-

(A) two flip flops connected in series

(B) two flip flops connected in parallel

(D) a D-latch

Answer: (A)

63. Number of nibbles making one byte is

(A) 2

(B) 4

(D) 16

Answer: (A)

64. The intrinsic impedance of free space –

(A) is independent of frequency

(B) decreases with increase of frequency

(D) varies as square root of frequency

Answer: (A)

65. A system consists of 12 poles and 2 zeroes. It high frequency asymptote in its magnitude plot has a slope of

(A) −200 dB/decade

(B) −240 dB/decade

(D) −320 dB/decade

Answer: (A)

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

(D) 2, 3 and 4

Answer: (D)

67. In the equatorial plane only Geosynchronous satellite are launched because it is the only plane which provides –

(A) 24 hour orbit

(B) stationary satellite

(D) zero-gravity environs

Answer: (B)

68. Radio Broadcasting is an example of-

(A) space multiplexing

(B) time multiplexing

(D) none of the above

Answer: (C)

69. PAM signals can be demodulation by using a

(A) Low Pass Filters (LPE) alone

(B) Schmitt trigger followed by a LPF

(D) clipper circuit by a LPF

Answer: (D)

70. In a FDM receiver channels can be separated by using –

(A) AND gates

(B) Band pass

(D) Integration

Answer: (A)

71. The most common modulation system used for telegraphy is –

(A) Frequency Shift Keying

(B) Two – Tone Modulation

(D) Single Tone Modulation

Answer: (A)

72. Use of varactor diode in generation of modulated signal be

(A) FM generation only

(B) 100 AM generation only

(D) both PM and AM generation

Answer: (A)

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

(D) provide degaussing for the screen

Answer: (C)

74. The circuit that separates composite video waveform from the sync pulses is –

(A) the keyed AGC amplifier

(B) a clipper

(D) a sawtooth current

Answer: (D)

75. Band width of microwaves is –

(A) 1 GHz – 103 GHz

(B) 1 GHz – 100 GHz

(D) 1 GHz – 106 GHz

Answer: (A)

76. In transverse Magnetic mode –

(A) no electric line is in direction of propagation

(B) no magnetic line is in direction of propagation

(D) neither magnetic nor electric lines in direction of propagation

Answer: (B)

77. Signal transmission on sky wave propagation is due to-

(A) Refraction of wave

(B) Reflection of wave

(D) None

Answer: (A)

78. According to Barkhausen Criterion Phase shift of signal should be-

(A) 60°

(B) 90°

(D) 360°

Answer: (D)

79. The transmission does not have

(A) Partition noise

(B) Flicker noise

(D) Short noise

Answer: (A)

80. Varoctor diode has non linearity of

(A) capacitance

(B) inductance

(D) is a linear device

Answer: (A)

81. Noise figure is calculated as –

(A) i/p S/N Ratio × o/p S/N Ratio

(B) i/p S/N Ratio / o/p S/N Ratio

(D) i/p S/N Ratio + o/p S/N Ratio

Answer: (B)

82. You can determine quickly the effect of adding poles and zeros by-

(A) Nicholas chart

(B) Nyquist plot

(D) Root locus

Answer: (C)

83. The polar plot of intercepts real axis at w = w_o. Then, the real part and wo are given by

(A) −5, 1

(B) −2.5, 1

(D) −5, 2

Answer: (A)

84. Laplace transform F(s) of a function of f(E) is given by The initial and final values of F(t) will be respectively –

(A) zero and 1

(B) zero and 10

(D) 70 and 80

Answer: (C)

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 incoming signal

(D) maximize antenna gain.

Answer: (B)

86. The first determining factor in selecting a satellite system is its-

(A) EIRP

(B) Antenna size

(D) Antenna gain

Answer: (C)

87. Equalizing pulses in TV are sent during –

(A) horizontal blanking

(B) vertical blanking

(D) the horizontal retrace

Answer: (B)

88. Silicon has a preference in IC technology because

(A) it is an indirect semiconductor

(B) it is a covalent semiconductor

(D) of the availability of nature oxide SiO

Answer: (D)

89. The R.M.S. value of a half wave rectified sinusoidal alternating current with peak value I_m is

(A) I_m/1

(B) I_m/√2

(D) I_m/√3

Answer: (C)

90. The transient current in lossless L-C circuit when exited from AC source is, _____ sine wave

(A) Critically damped

(B) Underdamped

(D) Undamped

Answer: (D)

91. A transmission line is terminated at its characteristic impedance. The reflection coefficient is

(A) 1

(B) −1

(D) ∞

Answer: (C)

92. In a series RLC circuit operation below the resonant frequency the current

(A) I leads V_s

(B) I lags V_s

(D) None of these

Answer: (A)

93. To distinguish between signals having very close values, we need an instrument with

(A) high accuracy

(B) high resolution

(D) high linearity

Answer: (B)

94. The semiconductor used for LEDs emitting in the visible range is

(A) GaAs

(B) GaAℓAs

(D) GaAsP

Answer: (D)

95. Which of the following pairs of crystal structure possesses the same atomic packing density?

(A) Simple Cubic & Body Centred Cubic

(B) Body Centred Cubic & Face Centred Cubic

(D) Body Centred Cubic & Hexagonal Close Packed

Answer: (C)

96. The colouor bands on a carbon composition resistor occur in the sequence:

yellow, violet, yellow and silver.

Its resistance is

(A) 470 KΩ ± 47%

(B) 470 KΩ ± 23.5%

(D) 47 KΩ ± 5%

Answer: (C)

97. A radio receiver is placed at one corner of a table and again placed at some other corner of the same table. Loudspeaker output is changed because

(A) image interference is reduced

(B) adjacent channel interference is increased

(D) line of sigh propagation is not utilized

Answer: (C)

98. In a Klystron amplifier, the RF voltage producers

(A) Amplitude Modulation

(B) Frequency Modulation

(D) Velocity Modulation

Answer: (D)

99. For an antenna to be frequency-independent it should expand or contract in proportion to the

(A) gain

(B) directivity

(D) impedance

Answer: (D)

100. In class-A power amplifier, the collector dissipation is maximum when

(A) MOV A, A

(B) ANI 00H

(D) CMP A

Answer: (A)

Section – III General Ability Test

101. The son seems to have ____ from his father a somewhat gloomy and moody manner.

(A) washed

(B) inherited

(D) attempt

Answer: (B)

102. Essayist works with words as sculptor with

(A) water

(B) stone

(D) hills

Answer: (B)

103. What is a collection of sheep called?

(A) bunch

(B) flock

(D) comet

Answer: (B)

104. Join these sentence meaningfully by choosing the correct alternative from the following You can buy a book. You can read it.

(A) and

(B) nor

(D) neither

Answer: (A)

105. What is the opposite of Asperity –

(A) gentility

(B) superiority

(D) clarity

Answer: (B)

106. The Election Commission functions under –

(A) Ministry of Home Affairs

(B) Ministry of Law

(D) None of these

Answer: (D)

107. Article 352 of Indian Constitution needs to be revoked in case –

(A) President’s Rule is to be imposed

(B) Emergency is declared

(D) A political party of national level is to be banned

Answer: (B)

108. Radio-activity was first discovered by-

(A) Becquerel

(B) Madam Curie

(D) Jenner

Answer: (A)

109. Ninth Five Year Plan in India ranges from –

(A) 1995 – 2000

(B) 1996 – 2001

(D) 1998 – 2003

Answer: (C)

110. How much electricity does India propose to generate through nuclear power by the year 2014 AD?

(A) 15,000 MW

(B) 35,000 GW

(D) 40,000 GW

Answer: (B)

111. In which year did the fall of Bastille take place?

(A) 1769

(B) 1789

(D) 1869

Answer: (B)

112. 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

(D) 1/5th of total membership

Answer: (A)

113. How many countries are non-permanent members of the Security Council?

(A) 6

(B) 7

(D) 10

Answer: (D)

114. The International Date Line is represented by

(A) 100° meridian

(B) 0° meridian

(D) 90° meridian

Answer: (C)

115. India’s first satellite was launched from –

(A) Sriharikota

(B) Cape Kennedy

(D) Soviet cosmodrome

Answer: (D)

116. Name of the author of the famous book “Politics” –

(A) Aristotle

(B) Socrates

(D) None of these

Answer: (A)

117. “Guernica” is Picasso’s painting on –

(A) The Spanish Civil War

(B) The American Civil War

(D) The Russian Revolution

Answer: (A)

118. 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

(D) None of these

Answer: (A)

119. Which country in July’99 officially announced mastering of indigenously developed neutron bomb technology?

(A) Korea

(B) France

(D) China

Answer: (D)

120. Shifting cultivation is commonly used in which of the following states?

(A) Tamil Nadu

(B) Maharashtra

(D) Nagaland

Answer: (D)

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