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Showing posts with label TTA OLD EXAM PAPERS. Show all posts
Showing posts with label TTA OLD EXAM PAPERS. Show all posts

Wednesday, 29 May 2013

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BHARAT SANCHAR NIGAM LIMITED
Telecom Technical Assistant
Network & Transmission Line Model Paper
Q.1.Pick up wrong statement
  1. A group of interconnected individual components known as circuit elements is called a network.
  2. A humped network is an arrangement of physically separate resistors, inductors and capacitors.
  3. Distributed network is one, which the resistive, inductive and capacitive effects are inseparable for network analyses.
  4. A branch is a network having four elements.
Q.2.Kirchoff's laws for networks are:
  1. The algebraic sum of branch currents meeting at any node is zero.
  2. The algebric sum of voltage drops in any set of branches forming a closed circuit or loop must be equal to zero.
  3. Both (a) and (b)
  4. Neither (a) and (b)
Q.3.Mutually coupled circuit is a circuit which is:
  1. Bilateral
  2. Unilateral
  3. None of these
  4. Either (a) or (b)
Q.4.Duality is a
  1. Transformation in which current and voltages are interchanged
  2. Active sources become passive sources
  3. Passive sources become active sources
  4. Both (b) and (c)
Q.5.Combined inductance of two inductors L1 and L2 connected & voltages are interchanged
  1. L1 + L2
  2. (L1 + L2)/ L1
  3. (L1 + L2) / (L1.L2)
  4. (L1.L2) / (L1 + L2)
Q.6.Normal analysis techniques are based on
  1. Thevenin's theorem
  2. Tellegan's theorem
  3. Superposition theorem
  4. Kirchoff's Law
Q.7.Two voltage sources can be connected in parallel when they are equal in
  1. Magnitude
  2. Frequency
  3. Phase
  4. All the above
Q.8.The kirchoff's law fail in
  1. Linear circuits
  2. Non-linear circuits
  3. Lumped parameter circuits
  4. Distributed parameter circuits
Q.9.Which of the following is a nonreciprocal network ?
  1. A network consisting of all resistances
  2. A network consisting of all capacitance
  3. A network consisting of all inductance
  4. A transistor model
Q.10.When two systems obey equations of the same form the systems are said to be
  1. Similar system
  2. Identical system
  3. Analogous system
  4. Digital system
Q.11.For a highly selective circuit
  1. It must have large value of Q
  2. It must have high value of capacitance to produce resonance at fixed frequency
  3. Either (a) or (b)
  4. Neither (a) nor (b)
Q.12.A network consisting of four terminals is called a
  1. One port network
  2. Two port network
  3. Four port network
  4. None of the above
Q.13.Driving point of a network is
  1. A port where voltage or current source is connected
  2. A terminal where load is connected
  3. A port where load is connected
  4. None of the above
Q.14.Ceramic filters are similar in construction to
  1. Crystal filters
  2. Crystal ladder filters
  3. Crystal lattice
  4. Mechanical filters
Q.15.When two port networks are connected in parallel the resultant
  1. Z parameters are the some of individual parameters
  2. Y- parameters are the some of individual parameters
  3. Both (a) and (b)
  4. Neither (a) nor (b)
Q.16.Electric wave filters
  1. Allow electric signals with specified frequency range
  2. Suppress signals outside a specified range
  3. Both (a) and (b) occurs simultaneously
  4. Either (a) or (b) occur at a time
Q.17.A cascade connection of low pass filter and high pass filter is called
  1. Band pass filter
  2. Band elimination filter
  3. Neither (a) nor (b)
  4. Both (a) and (b)
Q.18.The response of a network is decided by the location of
  1. Its poles
  2. Its zeros
  3. Either (a) nor (b)
  4. Both (a) and (b)
Q.19.Example of two port network is
  1. Transformer
  2. Transmission line
  3. Bridge circuit and transistor circuit
  4. All of the above
Q.20.The circuit whose properties are same in either direction is called
  1. Universal circuit
  2. Reversible circuit
  3. Unilateral circuit
  4. Bilateral circuit
Q.21.Distortion in transmission line is due to
  1. Delay distortion
  2. Phase distortion
  3. Frequency distortion
  4. All the above
Q.22.The general parameters distributed along a transmission line are
  1. R&L only
  2. L&C only
  3. C&G only
  4. R, L, C&G
Q.23.Phase distortion is prominently caused by
  1. circuit transients
  2. non linear characteristics
  3. linearity
  4. none
Q.24.The voltage or current from the receiving end towards the sending end, decreasing in
amplitude with increasing distance from the load is called
  1. incident wave
  2. medium wave
  3. reflected wave
  4. none of above
Q.25.E.M. Waves of UHF is propagated efficiently via
  1. parallel wire transmission lines
  2. open wire transmission lines
  3. wave guides
  4. coaxial cables
Q.26.Norton theorem is valid for network containing only
  1. linear elements
  2. no linear elements
  3. resistance
  4. reactance
Q.27.The maximum power is absorbed by one network from other, joined to it at two terminals
when the impedance of one is
  1. complex conjugate of other
  2. square root of other
  3. same as other
  4. (d) none of above
Q.28.The decrease in effective conductor cross section at high frequencies
  1. decrease the conductor resistance
  2. increase the conductor resistance
  3. no change in conductor resistance
  4. none of above
Q.29.Voltage standing wave ratio lies in the range
  1. 0 to 1
  2. 1 to infinity
  3. 0 to infinity
  4. -1 to +1
Q.30.Attenuators have applications
  1. in AC circuits only
  2. in DC circuits only
  3. in AC as well DC circuits
  4. in low frequency circuits only
Q.31.In an network
  1. the number of tree branches is equal to the number of links
  2. the number of tree branches cannot be equal to the number of links
  3. the number of tree branches has no relation with the number of links branches
  4. none of these
Q.32.In open line transmission systems, attenuation is more at
  1. lower frequencies
  2. medium frequencies
  3. higher frequencies
  4.        remains constant
Q.33.a power ratio 100 is equivalent to
  1. 10 dB
  2. 20 dB
  3. 50 dB
  4. 100 dB
Q.34.The velocity factor for small widely spaced conductors such as open wire line in air is very
nearly
  1. 0.66
  2. 0.98
  3. 0.82
  4. 0.76
Q.35.Transmission of power to a load over a transmission line achieves optimum value when
standing wave ratio (SWR) becomes
  1. 2 : 1
  2. 1 : 2
  3. 1 : 1
  4. 1 : 10
Q.36.The VSWR in a short circuited loss less transmission line equals
  1. infinity
  2. unity
  3. zero
  4. none of above
Q.37.The velocity factor of a transmission line
  1. is always greater than unity
  2. depend upon the permittivity of the surrounding medium
  3. is lease for air medium
  4. is governed by skin effect
Q.38.Which of the following is not correct
  1. voltage source is an active element
  2. current source is a passive element
  3. resistance is a passive element
  4. conductance is a passive element
Q.39.A network is said to be nonlinear if it does not satisfy
  1. superposition condition
  2. homogeneity condition
  3. both superposition and homogeneity conditions
  4. associative condition
Q.40.An capacitor with zero initial condition at t = 0+ act as a
  1. short circuit
  2. open circuit
  3. current source
  4. voltage source
Q.41.An inductor stores energy in
  1. electrostatic field
  2. electromagnetic field
  3. magnetic field
  4. core
Q.42.In series LCR circuits, at resonance,
  1. current is maximum, power factor is zero
  2. current is maximum, power factor is unity
  3. current is minimum, power factor is unity
  4. none of above
Q.43.In an RCL series circuit, during resonance, the impedance will be
  1. zero
  2. minimum
  3. maximum
  4. none of above
Q.44.When a source is delivering maximum power to load, the efficiency of the circuit is always
  1. 50%
  2. 75%
  3. 100%
  4. None of above
Q.45.In a linear network, when the ac input is doubled, the ac output becomes
  1. two times
  2. four times
  3. half
  4. one forth
Q.46.A passive network has
  1. current sources but no voltage sources
  2. voltage sources but no current sources
  3. both current and voltage sources
  4. no voltage or current sources
Q.47.Two resistances are connected in parallel and each dissipates 50 waits. The total power
supplied by the source is
  1. 25 watts
  2. 50 watts
  3. 100 watts
  4. 200 watts
Q.48.Three bulbs of 60 watts each are connected is parallel across 220v, 50 Hz supply. If one bulb burns out
  1. only remaining two will operate
  2. remaining two will not operate
  3. all of three will operate
  4. there will be heavy current from the supply
Q.49.The amplitude of an audio signal is 10 & that of carrier wave is 50.Percentage modulation
is:
  1. 0.2
  2. 20
  3. 5
  4. 60
Q.50.The main advantage of PCM system is:
  1. lower bandwidth
  2. lower power
  3. lower noise
  4. lower time 
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    Tuesday, 23 April 2013

    TTA EXAMPAPERS I TTA PREVIOUS YEAR PAPERS I TTA QUESTION PAPERS I TTA LAST YEAR PAPERS I TTA SOLVED EXAM PAPERS I TTA TEST PAPERS I TTA PRACTICE PAPERS I

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    BHARAT SANCHAR NIGAM LIMITED (BSNL)
    TELECOM TECHNICAL ASSISTANT 
    BSNL TTA Model Paper
    • BSNL Telecom Technical Assistant Exam Model Paper-11
    • BSNL Telecom Technical Assistant Exam Model Paper-12
    • BSNL Telecom Technical Assistant Exam Model Paper-13
    • BSNL Telecom Technical Assistant Exam Model Paper-14
    • BSNL Telecom Technical Assistant Exam Model Paper-15
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    TTA EXAM PAPERS I DOWNLOAD TTA EXAM PAPERS I TTA PREVIOUS YEAR PAPERS I TTA PRACTICE PAPERS I

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    BHARAT SANCHAR NIGAM LIMITED

    BSNL TTA Model Exam Papers

    Microwave & Communication

    Q.1The most common modulation system used for telegraphy is
    • FSK
    • PSK.
    • PCM
    • single tone modulation
    • Two tone modulation
    Q.2.VSB is an abbreviation of vestigal sideband, is derived by filtering
    • DSB
    • AM
    • either (a) or (b)
    • PM
    Q.3.In practical waveguide act as
    • low pass filter
    • high pass filter
    • band pass filter
    • band stop filter
    Q.4.The Hartely law states that
    • The maximum rate of information transmission depends on the depth of modulation
    • The maximum rate of information depends on the channel bandwidth.
    • Only binary codes may be used
    • Redundancy is essential
    Q.5.The FM signal with, a modulation index mf is passed through a frequency tripler. The wave in the output of the tripler will have a modulation index of
    • mf/9
    • mf/3
    • mf
    • 3 mf
    • 9mf
    Q.6.Due to curvature of earth, microwave repeaters are placed at distance of about
    • l0 Km
    • 50 Km
    • 200 Km
    • 500 Km
    Q.7.In high power AM transmission, modulation is done at
    • Buffer stage
    • Oscillator stage
    • RF power stage
    • If stage
    Q.8.Which of the following is not a microwave generation source?
    • Klystron
    • Magnetron
    • TWT
    • Diode
    Q.9.Companding is used
    • In delta modulator to combat noise
    • To limit amplitude in PCM transmitters.
    • In PWM for working it with TDM
    • To protect small signals in PCM from quantizing distortion
    • In PCM to reduce the SNR
    Q.10.In PCM system the SNR of the output signal increases
    • Inversely with bandwidth
    • Exponential with bandwidth
    • With rate of sampling
    • At low frequencies only
    Q.11.Armstrong modulator generates
    • Phase modulated signal
    • Frequency modulated signal
    • Both of these
    • Pulse code modulated signal 
    • AM and PCM signals
    Q.12.A Klystron is a cavity acting as buncher and catcher is used as microwave tube for
    • Guiding waves
    • Velocity modulation
    • frequency modulation
    • impedance matching
    • All of these
    Q.13.Easily adjustable tuning component in a waveguide is
    • plunger
    • plunger and stub
    • screw
    • both (a) and (c)
    • both (b) and (c)
    Q.14.A ferrite is
    • A non-conductor with magnetic properties
    • A conductor with magnetic properties
    • A semiconductors
    • An insulator which attenuates magnetic fields
    • A compound with good conductivity.
    Q.15.Vacuum tubes eventually fail at microwave frequencies because of their
    • Inter electrode capacitance
    • Small series inductance
    • Large shunt capacitance
    • Short transit time
    • Increased noise figure
    Q.16.The biggest disadvantage the IMP ATT diode has is its
    • Low Efficiency
    • high noise
    • Low BW
    • inability to provide pulse operation
    • low power handling ability
    Q.17.An attenuator is used with TWT to
    • prevent oscillations
    • increase gain
    • prevent saturation
    • help bunching
    Q.18.In AM transmission the frequency, which is not transmitted is
    • carrier frequency
    • audio frequency
    • upper side frequency
    • lower side frequency
    Q.19.Maximum undistorted power output of a transmitter is obtained when its modulation is:
    • more than 100%
    • 100%
    • less than 100%
    • 50%
    Q.20.The cut off frequency of a wave guide means
    • lower frequencies will not be propagated
    • it determines the dimensions of the wave guide
    • frequency at which zero transmission takes place
    • None of above
    Q.21.FM broadcast band lies in
    • VHF
    • UHF
    • SHF
    • HF
    Q.22.Automatic gain control is used
    • to maintain the tuning correct
    • to reduce the voltage of loud passage of music
    • to maintain the same amount of output, when stations of different strength are received
    • to increase the amplification at high frequencies
    Q.23.The modulation system inherently is most noise resistant in
    • SSB suppressed carrier
    • FM
    • PPM
    • PCM
    Q.24.An FM transmitter has maximum frequency deviation of 75 KHz and reproduces audio signal up to 15 KHz. Minimum channel width required, in KHz is
    • 180
    • 120
    • 90
    • 60
    Q.25.The antenna efficiencies achieved in practice depend upon
    • wave length
    • impedance
    • frequency
    • none of above
    Q.26.The process of compressing the digital codes at the transmitter and then expanding them back to their original form at receiver is known as
    • Quantizing
    • companding
    • step sizing
    • modulation
    Q.27.TWT is basically
    • an oscillator
    • tuned amplifier
    • wide band amplifier
    • an audio amplifier
    Q.28.In PPM, message resides in
    • Pulses
    • time location of pulse edges
    • none of these
    •  
    Q.29.Digital transmission efficiency is given by
    • information bits/total bits
    • total bits/information bits
    • redundant bits/information bits
    • none of the above
    Q.30.Which of the following pulse systems requires higher bandwidth
    • PAM
    • PDM
    • PPM
    • none of these
    Q.31.The speed of BRI ISDN interface is
    • 2B + D
    • 2D + B
    • 30B + D
    • 30D + B
    Q.32.In case of matched load
    • Transmission is zero
    • reflection is zero
    • reflection is unity
    • transmission is equivalent to reflection
    Q.33.A signal of maximum frequency of 1 KHz is sampled at Nyquist Rate.The interval between two successive samples is:
    • 50 micro seconds
    • 100 micro seconds
    • 500 micro seconds
    • 1000 micro seconds
    Q.34.Man made noise id caused by:
    • Solar eruptions
    • Distant Stars
    • Lightning Discharges
    • Arc discharge in electric machines
    Q.35.In order to get back the original signal, it is necessary to use:
    • low pass filter
    • high pass filter
    • band pass filter
    • band reject filter
    Q.36.The function of AM detector circuit is
    • to rectify the input signal
    • to discard the carrier
    • to provide the audio signal
    • All of the above
    Q.37.At microwave frequencies, the size of antenna becomes
    • very large
    • large
    • small
    • very small
    Q.38.To increase the Q factor of an induction, it wound with
    • thicker wire
    • thinner wire
    • longer wire
    • wire with heavy insulation
    Q.39.For handling large microwave power, the best medium is
    • coaxial line
    • rectangular waveguide
    • stripline
    • circular wave guide
    Q.40.The negative resistance in Gunn diode is due to
    • electron transfer to a less mobile energy level
    • high reverse bias
    • electron domain formation at the junction
    • tunneling across the junction
    Q.41.Which of the following sinusoidal oscillator is preferred for microwave frequencies?
    • resonant circuit oscillator
    • RC phase shift oscillators
    • negative resistance oscillators
    • all of the above
    Q.42.When electromagnetic waves are propagated in a waveguide
    • they travel along the walls of the waveguide
    • they travel through the dielectric without touching the walls
    • they are reflected from the walls but do not travel along the walls
    • none of above
    Q.43.The AGC voltage in a radio receiver is proportional to
    • the amount of modulation
    • the amplitude of audio signal
    • the amplitude of IF carrier
    • none of these
    Q.44.Which of the following pulse systems is preferred for communication in presence of noise?
    • PAM
    • PDM
    • PPM
    • none of above
    Q.45.Wave guides are generally made of
    • Cast iron or steel
    • White metal or gun metal
    • bronze or aluminium
    • plastic or bakelite
    Q.46.With 100% modulation,ratio of side band power to total power transmitted in an amplitude modulated wave is
    • 2/3
    • l/3
    • l/2
    • l/4
    Q.47.In an AM wave with 100% modulation, the carrier is suppressed.The percentage of power saving will be
    • 100%
    • 50%
    • 25%
    • 66.7%
    Q.48.Power factor of a purely resistive circuit is:
    • zero
    • one
    • 0.5
    • infinity
    Q.49.In FM, the noise can be further decreased by
    • decreasing deviation
    • increasing deviation
    • (c) keeping deviation constant
    • (d) none of these
    Q.50.The audio frequency range lies between
    • 20 to 20,000 Hz
    • 20 to 20,000 KHz
    • 400 to 8,000Hz
    • 500 to 5,000 Hz
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