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BSNL JTO (Junior
Telecom Officers) Previous Year Question Paper with Answers
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
Answer is :- Rectangular
1. 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
c) It's value for
all substances is less than one
d) None
Answer is :- It is
dimensionless
2. Pure metals
generally have-
a) high
conductivity and low temperature coefficient
b) high
conductivity and large temperature coefficient
c) low conductivity
and zero temperature coefficient
d) low conductivity
and high temperature coefficient
Answer is :- high
conductivity and large temperature coefficient
3. For small size,
high frequency coils, the most common core material is
a) Air
b) Ferrite
c) Powdered ion
d) Steel
Answer is :- Air
4. For an abrupt
junction Varactor diode, the dependence of device capacitance (C) on
applied reverse
bias (V) is given by-
a) C a V1/3
b) C a V-1/3
c) C a V1/2
d) C a V-1/2
Answer is :- C a
V-1/3
5. A superconductor
is a-
a) A material
showing perfect conductivity and Meissner effect below a critical
temperature
b) A conductor
having zero resistance
c) A perfect
conductor with highest dimagnetic susceptibility
d) A perfect
conductor which becomes resistive when the current density through it
exceeds a critical
valueAnswer is :-A material showing perfect conductivity and Meissner effect
below a critical
temperature
6. When a
semiconductor based temperature transducer has a temperature coefficient of
"
2500 mV/0C then
this transducer is indeed a-
a) Thermistor
b) Forward biased
pn junction diode
c) Reverse biased
pn junction diode
d) FET
Answer is :-
Forward biased pn junction diode
7. The location of
lightning arrestor is -
a) Near the
transformer
b) Near the circuit
breaker
c) Away from the
transformer
d) None
Answer is :- Near
the transformer
8. Time constant of
an RC circuit increases if the value of the resistance is -
a) Increased
b) Decreased
c) Neither a nor b
d) Both a and b
Answer is :-
Increased
9. Intrinsic
semiconductors are those which -
a) Are available
locally
b) Are made of the
semiconductor material in its purest from
c) Have more
electrons than holes
d) Have zero energy
gaps
Answer is :- Are
made of the semiconductor material in its purest from
10. The primary
control on drain current in a JFET is exerted by -
a) Channel
resistance
b) Size of
depletion regions
c) Voltage drop
across channel
d) Gate reverse
bias
Answer is :- Gate
reverse bias
11. The electrical
conductivity of metals which is expressed in ohm-1 m-1 is of the order
of -
a) 1010
b) 105
c) 10-4
d) 10-6
Answer is :- 105
12. When biased
correctly, a zener diode "
a) acts as a fixed
resistance
b) has a constant
voltage across it
c) has a constant
current passing through it
d) never overheats
Answer is :- has a
constant voltage across it
13. The current
amplification factor adc is given by "
a) IC/IE
b) IC/IB
c) IB/IC
d) IB/IC
Answer is :- IC/IE
14. Compared to
bipolars, FETs have-
a) high input
impedance
b) low input
impedance
c) same input
impedance
d) none
Answer is :- high
input impedance
15. The
source-drain channel of JFET is -
a) ohmic
b) bilateral
c) unilateral
d) both a and b
Answer is :- both a
and b
16. diac is
equivalent to a -
a) Pair of SCRs
b) Pair of four
layer SCRs
c) Diode and two
resistors
d) Triac width
Answer is :- Pair
of four layer SCRs
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/cm3
b) 103/ cm3
c) 1010/ cm3
d) 1012/ cm3
Answer is :- 103/
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 law
b) Norton's theorem
c) Thevenin's
theorem
d) Superposition
theorem
Answer is :-
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 mode
b) TM01 mode
c) TE01 mode
d) Higher order
mode
Answer is :- TE01
mode
20. A two-port
network is symmetrical if "
a) z11z22 "
z12z21 = 1
b) h11h22 "
h12h21 = 1
c) AD " BC = 1
d) y11y22 "
y12y21 = 1
Answer is :-AD
" BC = 1
21. For
transmission line load matching over a range of frequencies, it is best to use
a-
a) balun
b) broad band
directional coupler
c) double stub
d) single stub of
adjustable position
Answer is :- double
stub
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 network
b) as an RC driving
point impedance
c) as an RC driving
point admittance
d) only by an RLC
network
Answer is:- 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 C
b) L and C
c) R and L
d) R, L and C
Answer is :- L and
C
24. For a two port
reciprocal network, the output open circuit voltage divided by the input
current is equal to "
a) B
b) Z12
c) "
d) h12
Answer is :- Z12
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.
Answer is :-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
MHz
b) 150 " 200
MHz
c) 90 " 105
MHz
d) 30-70 MHz
Answer is :-90
" 105 MHz
27. In an
underground cable the distortion in the transmission of carrier frequency can
be
eliminated by using
-
a) Inductive
loading
b) Resistive
loading
c) Capacitive
loading
d) Shielding
Answer is :-
Inductive loading
28. The
characteristic impedance of a transmission line with inductance 0.294 mH /m and
capacitance 60 pF/m is -
a) 49 W
b) 60 W
c) 70 W
d) 140 W
Answer is :- 70 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) 25W
b) 50Wc) 100W
d) 150W
Answer is :- 25W
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
c) directly proportional
to f and inversely proportional to r and m
d) inversely
proportional to r and m and directly proportional to f
Answer is :-
directly proportional to r and inversely proportional to f and m
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 0
b) 1.44560
c) 2.44560
d) 3.44560
Answer is :-
2.44560
33. Lens antennas
used for microwaves are usually made of -
a) Polystyrene
b) Glass of low
refractive index
c) Paraboloid
surfaces
d) Dielectric media
having large refractive index An,
34. One of the
following types of instrument which is an electrometer is -
a)
Electrodynamometer
b) PMMC
c) Electrostatic
d) Moving iron
Answer is :-
Electrostatic
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
c) A dc ammeter
will read 10A
d) A dc ammeter
will read zero
Answer is :- An ac
ammeter will read less than 10A but more than 5A
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
c) bandwidth is
larged) none of these
Answer is :- none
of these
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
c) it's internal
clock period
d) the minimum
amplitude of input signal it can display
Answer is :- the
minimum amplitude of input signal it can display
38. A memoryless
system is "
a) causal
b) not causal
c) nothing can be
said
d) none
Answer is :- causal
39. An air
capacitor is a "
a) time variant
b) active device
c) time invariant
d) time invariant
and passive device
Answer is :-time
invariant and passive device
40. Thermistors are
made of -
a) pure metals
b) pure insulators
c) sintered
mixtures of metallic oxides
d) pure
semiconductor
Answer is :-
sintered mixtures of metallic oxides
41. Pirani gauge is
used to measure "
a) very low
pressures
b) high pressures
c) pressures in the
region of 1 atm
d) fluid flow
Answer is :- very
low pressures
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
c) Phase controlled
rectifiers
d) Inverters
Answer is :-Cyclo
converters
43. In a forward
voltage Triggering thyristor changes from "
a) off state to on
state
b) on state to off
state
c) on state to on
state
d) off state to off
state
Answer is :- off
state to on 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 voltage
b) peak working off
state forward voltage
c) peak working off
state reverse voltage
d) peak
non-repetitive off state forward voltage
Answer is :- peak
working off state forward voltage
45. Gate
characteristic of a thyristor-
a) is a straight
line passing through origin
b) is of the type
Vg = a + bIg
c) is a curve
between Vg and Ig
d) has a spread
between two curves of Vg " Ig
Answer is :-has a
spread between two curves of Vg " Ig
46. A four quadrant
operation requires-
a) two full
converters in series
b) two full
converters connected back to back
c) two full
converters connected in parallel
d) two semi
converters connected back to back
Answer is :-two
full 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, P
b) Vs/2, P
c) 2Vs, 2P
d) 2Vs, P
Answer is :- 2Vs,
2P
48. In an
enhancement type MOSFET the output V-I characteristics has "
a) only an ohmic
region
b) only a
saturation region
c) only ohmic
region at 10 W voltage value followed by a saturation region at higher voltages
d)an ohmic region
at large voltage values preceded by a saturation region at lower voltages
Answer is :- only
ohmic region at 10 W voltage value followed by a saturation region at higher
voltages
49. The energy gap
in a semiconductor -
a) increases with
temperature
b) remains constant
c) slightly
increase with temperature
d) decrease with
temperature
Answer is
:-decrease with temperature
50. In an
electronic circuit matching means -
a) connecting a
high impedance directly to low impedance
b) selection of
components which are compatible
c) transferring
maximum amount of signal between different kinds of circuits.
d) RC coupled
stages
Answer is
:-transferring maximum amount of signal between different kinds of circuits.
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
Answer is :-
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
Answer is :-
Increase in ICEO
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
Answer is :- 30KHz
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
Answer is :-
consists of positive half cycles only
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
Answer is :- 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
1d) An additional
local oscillator will be needed
Answer is :- A FM
detector would be required
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
Answer is :- slower
speed
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
Answer is :- ?t = 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
Answer is :- y and
0
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
Answer is :- a
transistor acting as a capacitor
61. The 2's
complement of 10002 is "
a) 0111b) 0101
c) 1000
d) 0001
Answer is :-1000
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
Answer is :-two
flip flops connected in series
63. Number of
nybbles making one byte is "
a) 2
b) 4
c) 8
d) 16
Answer is :- 2
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
Answer is :-is
independent 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
Answer is :-
"200 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
Answer is :-2, 3
and 4 swer is :- Polystyrene,
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
c) global communication
d) zero-gravity
environs
Answer is :-
stationary satellite
68. Radio
Broadcasting is an example of "
a) space
multiplexing
b) time
multiplexing
c) frequency
multiplexing
d) none of the
above
Answer is :-
frequency multiplexing
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
Answer is:- 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
Answer is :- AND
gates
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
Answer is :-
frequency shift keying
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
Answer is :- FM
generation only
73. In colour
picture tube shadow mask is used to-
a) reduce x-ray
emission
b) ensure that each
beam strikes only its own dotsc) increase screen brightness
d) provide
degaussing for the screen
Answer is :-
increase screen brightness
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
Answer is :- 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
Answer is :- 1GHz
-103 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
Answer is :- no
magnetic line is 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
Answer is :-
Reforction of wave
78. According to
Barkhausen Criterion Phase shift of signal should be "
a) 6000
b) 9000
c) 18000
d) 36000
Answer is :- 3600
79. The
transmission does not have -
a) Partition noise
b) Flicker noise
c) resistance
d) Short noise
Answer is :-
Partition noise
80. Varoctor diode
has non linearity of -
a) capacitance
b) Inductance
c) Resistance
d) Is a linear
device
Answer is :-
capacitance
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
Answer is :- 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.
Answer is :- Bode
plot
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
Answer is :-
"5, 1
84. Laplace
transform F (s) of a function f (E) is given by F(s)=10s(s+7)/(s+1)(s+8)(s+10)
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
Answer is :-10 and
zero
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
Answer is :- avoid
interference between its powerful transmitted signals and weak in coming signal
86. The first
determining factor in selecting a satellite system is its-
a) EIRP
b) Antenna size
c) Coverage area
d) Antenna gain
Answer is :-
Coverage area
87. Equalizing
pulses in TV are sent during-
a) horizontal
blanking
b) vertical
blanking
c) the serrations
d) the horizontal
retrace
Answer is
:-vertical blanking
88. The son seems
to have """ from his father a somewhat gloomy and moody manner-
a) washed
b) inherited
c) admired
d) attempt
Answer is
:-inherited
89. Essayist works
with words as sculptor with-
a) water
b) stone
c) air
d) hills
Answer is :- stone
90. What is a
collection of sheep called ?
a) bunch
b) flock
c) herd
d) comet
Answer is :- flock
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
Answer is :- and
92. What is the
opposite of Asperity "
a) gentility
b) superiority
c) kindness
d) clarity
Answer is :-
superiority
93. The Election
Commission functions under-
a) Ministry of Home
Affairs
b) Ministry of Law
c) Prime Minister's
Secretariat
d) None of these
Answer is :-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
Answer is :-
Emergency is declared
95. Radio-activity
was first discovered by-
a) Becquerel
b) Madam Curie
c) Rutherford
d) Jenner
Answer is :-
Becquerel
96. Ninth Plan in
India ranges from-
a) 1995-2000
b) 1996-2001
c) 1997-2002
d) 1998-2003
Answer is :-
1997-2002
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
Answer is :- 10,000
MW
98. In which year
did the fall of Bastille take place?
a) 1769
b) 1789c) 1889
d) 1869
Answer is :- 1789
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
Answer is :- 1/10th
of total membership
100. How may
countries are non-permanent members of the Security Council?
a) 6
b) 7
c) 9
d) 10
Answer is :- 10
101. The
International Date Line is represented by-
a) 1000
meridian
b) 000
meridian
c) 1800
meridian
d) 900
meridian
Answer is :- 1800
meridian
102. India's first
satellite was launched from-
a) Sriharikota
b) Cape Kennedy
c) Bangalore
d) A Soviet cosmodrome
Answer is :- A
Soviet cosmodrome
103. Name the
author of the famous book "Politics-
a) Aristotle
b) Socrates
c) Plato
d) None of them
Answer is :-
Aristotle
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
Answer is :- The
Spanish Civil War
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
Answer is :- To put
a limit on Parliament's amendatory powers
106. Which country
in July '99 officially announced mastering of indigenously
developed neutron
bomb technology?
a) N. Korea
b) France
c) India
d) China
Answer is :- China
107. Shifting
cultivation is commonly used in which of the following states?
a) Tamil Nadu
b) Maharashtra
c) Jammu and
Kashmir
d) Nagaland
Answer is :-
Nagaland
108) The polar plot
of G(S) = 10/s(s+1) 2 intercepts real axis at w = wo. Then, the real part and
wo are given by?
Answer is :-
"5, 1
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