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Old June 4th, 2014, 03:26 PM
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Default BSNL TTA exam previous year question papers

Can you please give me the Bharat Sanchar Nigam Ltd TTA exam previous year question papers as it is very urgent for me?
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Old June 4th, 2014, 08:09 PM
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As you want to get the Bharat Sanchar Nigam Ltd TTA exam previous year question papers so here is the information of the same for you:

Bharat Sanchar Nigam Ltd TTA exam previous year question papers

(1) Instrument is a device for determining
(a) the magnitude of a quantity
(b) the physics of a variable
(c) either of the above
(d) both (a) and (b)
(2) Electronic instruments are preferred because they have
(a) no indicating part
(b) low resistance in parallel circuit
(c) very fast response
(d) high resistance in series circuit
(e) no passive elements.
(3) A DC wattmeter essentially consist of
(a) two ammeters
(b) two voltmeters
(c) a voltmeter and an ammeter
(d) a current and potential transformer
(4) Decibel is a unit of
(a) power
(b) impedance
(c) frequency
(d) power ratio
(5) A dc voltmeter may be used directly to measure
(a) frequency
(b) polarity
(c) power factor
(6) An accurate voltmeter must have an internal impedance of
(a) very low value
(b) low value
(c) medium value
(d) very high value
(7) The insulation resistance of a transformer winding can be easily measured with
(a) Wheatstone bridge
(b) megger
(c) Kelvin bridge
(d) voltmeter
(8) A 100 V voltmeter has full-scale accuracy of 5%. At its reading of 50 V it will give an error of
(a) 10%
(b) 5%
(c) 2.5%
(d) 1.25%
(9) You are required to check the p. f. of an electric load. No p.f. meter is available. You would
(a) a wattmeter
(b) a ammeter, a voltmeter and a wattmeter
(c) a voltmeter and a ammeter
(d) a kWh meter
(10) The resistance of a field coil may be correctly measured by using
(a) a voltmeter and an ammeter
(b) Schering bridge
(c) a Kelvin double bridge
(d) a Maxwell bridge
(11) An analog instrument has output
(a) Pulsating in nature
(b) Sinusoidal in nature
(c) Which is continuous function of time and bears a constant relation to its input
(d) Independent of the input quantity
(12) Basic charge measuring instrument is
(a) Duddel's oscillograph
(b) Cathode ray oscillograph
(c) Vibration Galvanometer
(d) Bailastic Galvanometer
(e) Battery Charging equipment
(13) A.C. voltage can be measured (using a d.c. instrument) as a value obtained
(a) by subtracting the d.c. reading from it's a.c. reading.
(b) Using the output function of the multimeter
(c) By using a suitable inductor in series with it
(d) By using a parallel capacitor with it
(e) None of the above
(14) A moving coil permanent magnet ammeter can be used to measure
(a) D. C. current only
(b) A. C. current only
(c) A. C. and D. C. currents
(d) voltage by incorporating a shunt resistance
(e) none of these
(15) Select the wrong statement
(a) the internal resistance of the voltmeter must be high
(b) the internal resistance of ammeter must be low
(c) the poor overload capacity is the main disadvantage of hot wires instrument
(d) the check continuity with multimeter, the highest range should be used.
(e) In moving iron voltmeter, frequency compensation is achieved by connecting a capacitor across its
fixed coil.
(16) Which of the following instrument is suitable for measuring both a.c. and d.c.
(a) permanent magnet moving coil ammeter.
(b) Induction type ammeter.
(c) Quadrant electrometer.
(d) Moving iron repulsion type ammeter.
(e) Moving iron attraction type voltmeter.
(17) Swamping resistance is used in moving coil instruments to reduce error due to
(a) thermal EMF
(b) temperature
(c) power taken by the instrument
(d) galvanometer sensitivity.
(18) A power factor meter is based on the principle of
(a) electrostatic instrument
(b) Electrodynamometer instrument
(c) Electro thermo type instrument
(d) Rectifier type instrument.
(19) A potentiometer recorder is used for
(a) AC singles
(b) DC signals
(c) both (a) and (b)
(d) time varying signals
(e) none of these.
(20) Transformers used in conjunction with measuring instruments for measuring purposes are
(a) Measuring transformers
(b) transformer meters
(c) power transformers
(d) instrument transformers
(e) pulse transformers.
(21) Leakage flux in an electrical machine is measure by
(a) Ballistic galvanometer
(b) Flux meter
(c) Either (a) or (b)
(d) Vibration galvanometer
(e) CRO
(22) A C.R.O. is used to indicate
(a) supply waveform
(b) magnitude of the applied voltage
(c) B.H. loop
(d) all of these
(e) Magnitude of the current flowing in it.
(23) An oscillator is a
(a) an amplifier having feedback network
(b) a high gain amplifier
(c) a wide band amplifier
(d) a untuned amplifier
(e) None of these
(24) Distortion can be measured by
(a) Wave meter
(b) Digital filters
(c) Wein bridge circuit
(d) Bridge T filter circuit
(25) Series connected Q- meter is preferable for measurement of components having
(a) high impedance
(b) low impedance
(c) both (a) and (b)
(d) high frequency
(e) low capacitance
(26) A potentiometer is
(a) an active transducer
(b) a passive transducer
(c) a secondary transducer
(d) a digital transducer
(e) a current sensing transducer
(27) The basic components of a digital voltmeter are:
(a) A/D converter and a counter
(b) A/D converted and a rectifier
(c) D/A converter and a counter
(d) Ramp generator and counter
(e) Comparator
(28) Which of the following electrical equipment cannot convert ac into dc
(a) diode
(b) converter
(c) transformer
(d) mercury arc rectifier
(29) Voltage measurement are often taken by using either a voltmeter or
(a) an ammeter
(b) an ohmmeter
(c) an oscillator
(d) a watt-meter
(30)The electric device which blocks DC but allows AC is called:
(a) capacitance
(b) inductor
(c) an oscilloscope
(d) a watt-meter
(31 ) The range of an ammeter can be extended by using a
(a) shunt in series
(b) shunt in parallel
(c) multiplier in series
(d) multiplier in parallel
(32)A device that changes one form of energy to another is called
(a) rheostat
(b) oscillator
(c) transducer
(d) varicap
(33) Aquadag is used in CRO to collect
(a) primary electron
(b) secondary electron
(c) both primary and secondary
(d) none of above
(34) A vertical amplifier for CRO can be designed for
(a) only a high gain
(b) only a broad bandwidth
(c) a constant gain time bandwidth product
(d)all of the above
(35) One of the following is active transducer
(a) Strain gauge
(b) Selsyn
(c) Photovoltic cell
(d) Photo emissive cell
(36) The dynamic characteristics of capacitive transducer are similar to those of
(a) low pass filter
(b) high pass filter
(c) band pass filter
(d) band stop filter
(37) Thermocouples are
(a) passive transducers
(b) active transducers
(c) both active and passive transducers
(d) output transducers
(38) The size of air cored transducers as compare to iron core counter part are
(a) bigger
(b) smaller
(c) same
(39) From the point of view of safety, the resistance of earthing electrode should be:
(a) low
(b) high
(c) medium
(d) the value of resistance of electrode does not effect the safety
(40) In CRT the focusing anode is located
(a) between pre accelerating and accelerating anodes
(b) after accelerating anodes
(c) before pre accelerating anodes
(d) none of above
(41) Which transducer converts heat energy into electrical energy
(a) I. V. D. T.
(b) thermocouple
(c) photoconductor
(d) none of the above
(42) Which of photoelectric transducer is used for production of electric energy by converting
solar energy
(a) photo emission cell
(b) photo diode
(c) photo transistor
(d) both (b) and (c)
(43) Which of the following instruments consumes maximum power during measurement?
(a) induction instruments
(b) hot wire instruments
(c) thermocouple instruments
(d) electrodynamometer instruments
(44) Which of the following meters has the best accurancy
(a) moving iron meter
(b) moving coil meter
(c) rectifier type meter
(d) thermocouple meter
(45) The function of the safety resistor in ohm meter is to
(a) limit the current in the coil
(b) increase the voltage drop across the coil
(c) increase the current in the coil
(d) protect the battery
(46) Which of the following instruments is free from hysteresis and eddy current losses?
(a) M.l. instrument
(b) electrostatic instrument
(c) electrodynamometer type instrument
(d)all of these
(47) The dielectric loss of a capacitance can be measured by
(a) Wien bridge
(b) Owen bridge
(c) Schering bridge
(d) Maxwell bridge
(48) Reed frequency meter is essentially a
(a) recording system
(b) deflection measuring system
(c) vibration measuring system
(d) oscillatory measuring system
(49) In measurements made using a Q meter, high impedance elements should preferably be
connected in
(a) star
(b) delta
(c) series
(d) parallel
(50) A digital voltmeter measures
(a) peak value
(b) peak-to-peak value
(c) rms value
(d) average value

BSNL TTA Question Paper-Network/ Transmission 2007
1. Pick up wrong statement
(a) A group of interconnected individual components known as circuit elements is called a network.
(b) A humped network is an arrangement of physically separate resistors, inductors and capacitors.
(c) Distributed network is one, which the resistive, inductive and capacitive effects are inseparable for
network analyses.
(d) A branch is a network having four elements.
2. Kirchoff's laws for networks are:
(a) The algebraic sum of branch currents meeting at any node is zero.
(b) The algebric sum of voltage drops in any set of branches forming a closed circuit or loop must be
equal to zero.
(c) Both (a) and (b)
(d) Neither (a) and (b)
3. Mutually coupled circuit is a circuit which is:
(a) Bilateral
(b) Unilateral
(c) None of these
(d) Either (a) or (b)
4. Duality is a
(a) Transformation in which current and voltages are interchanged
(b) Active sources become passive sources
(c) Passive sources become active sources
(d) Both (b) and (c)
5. Combined inductance of two inductors L1 and L2 connected and voltages are interchanged
(a) L1 + L2
(b) (L1 + L2)/ L1
(c) (L1 + L2) / (L1 X L2)
(d) (L1 X L2) / (L1 + L2)
6. Normal analysis techniques are based on
(a) Thevenin's theorem
(b) Tellegan's theorem
(c) Superposition theorem
(d) Kirchoff's Law
7. Two voltage sources can be connected in parallel when they are equal in
(a) Magnitude
(b) Frequency
(c) Phase
(d) All the above
8. The kirchoff's law fail in
(a) Linear circuits
(b) Non-linear circuits
(c) Lumped parameter circuits
(d) Distributed parameter circuits
9. Which of the following is a nonreciprocal network ?
(a) A network consisting of all resistances
(b) A network consisting of all capacitances
(c) A network consisting of all inductances
(d) A transistor model
10. When two systems obey equations of the same form the systems are said to be
(a) Similar system
(b) Identical system
(c) Analogous system
(d) Digital system
11. For a highly selective circuit
(a) It must have large value of Q
(b) It must have high value of capacitance to produce resonance at fixed frequency
(c) Either (a) or (b)
(d) Neither (a) nor (b)
12. A network consisting of four terminals is called a
(a) One port network
(b) Two port network
(c) Four port network
(d) None of the above
13. Driving point of a network is
(a) A port where voltage or current source is connected
(b) A terminal where load is connected
(c) A port where load is connected
(d) None of the above
14. Ceramic filters are similar in construction to
(a) Crystal filters
(b) Crystal ladder filters
(c) Crystal lattice
(d) Mechanical filters
15. When two port networks are connected in parallel the resultant
(a) Z parameters are the some of individual parameters
(b) Y- parameters are the some of individual parameters
(c) Both (a) and (b)
(d) Neither (a) nor (b)
16. Electric wave filters
(a) Allow electric signals with specified frequency range
(b) Suppress signals outside a specified range
(c) Both (a) and (b) occurs simultaneously
(d) Either (a) or (b) occur at a time
17. A cascade connection of low pass filter and high pass filter is called
(a) Band pass filter
(b) Band elimination filter
(c) Neither (a) nor (b)
(d) Both (a) and (b)
18. The response of a network is decided by the location of
(a) Its poles
(b) Its zeros
(c) Either (a) nor (b)
(d) Both (a) and (b)
19. Example of two port network is
(a) Transformer
(b) Transmission line
(c) Bridge circuit and transistor circuit
(d) All of the above
20. The circuit whose properties are same in either direction is called
(a) Universal circuit
(b) Reversible circuit
(c) Unilateral circuit
(d) Bilateral circuit
21. Distortion in transmission line is due to
(a) Delay distortion
(b) Phase distortion
(c) Frequency distortion
(d) All the above
22. The general parameters distributed along a transmission line are
(a) R&L only
(b) L&C only
(c) C&G only
(d) R, L, C&G
23. Phase distortion is prominently caused by
(a) circuit transients
(b) non linear characteristics
(c) linearity
(d) none
24. The voltage or current from the receiving end towards the sending end, decreasing in
amplitude with increasing distance from the load is called
(a) incident wave
(b) medium wave
(c) reflected wave
(d) none of above
25. E.M. Waves of UHF is propagated efficiently via
(a) parallel wire transmission lines
(b) open wire transmission lines
(c) wave guides
(d) coaxial cables
26. Norton theorem is valid for network containing only
(a) linear elements
(b) no linear elements
(c) resistance
(d) reactance
27. The maximum power is absorbed by one network from other, joined to it at two terminals
when the impedance of one is
(a) complex conjugate of other
(b) square root of other
(c) same as other
(d) none of above
28. The decrease in effective conductor cross section at high frequencies
(a) decrease the conductor resistance
(b) increase the conductor resistance
(c) no change in conductor resistance
(d) none of above
29. Voltage standing wave ratio lies in the range
(a) 0 to 1
(b) 1 to infinity
(c) 0 to infinity
(d) -1 to +1
30. Attenuators have applications
(a) in AC circuits only
(b) in DC circuits only
(c) in AC as well DC circuits
(d) in low frequency circuits only
31. In an network
(a) the number of tree branches is equal to the number of links
(b) the number of tree branches cannot be equal to the number of links
(c) the number of tree branches has no relation with the number of links branches
(d) none of these
32. In open line transmission systems, attenuation is more at
(a) lower frequencies
(b) medium frequencies
(c) higher frequencies
(d) remains constant
33. a power ratio 100 is equivalent to
(a) 10 dB
(b) 20 dB
(c) 50 dB
(d) 100 dB
34. The velocity factor for small widely spaced conductors such as open wire line in air is very
(a) 0.66
(b) 0.98
(c) 0.82
(d) 0.76
35. Transmission of power to a load over a transmission line achieves optimum value when
standing wave ratio (SWR) becomes
(a) 2 : 1
(b) 1 : 2
(c) 1 : 1
(d) 1 : 10
36. The VSWR in a short circuited loss less transmission line equals
(a) infinity
(b) unity
(c) zero
(d) none of above
37. The velocity factor of a transmission line
(a) is always greater than unity
(b) depend upon the permittivity of the surrounding medium
(c) is lease for air medium
(d) is governed by skin effect
38. Which of the following is not correct
(a) voltage source is an active element
(b) current source is a passive element
(c) resistance is a passive element
(d) conductance is a passive element
39. A network is said to be nonlinear if it does not satisfy
(a) superposition condition
(b) homogeneity condition
(c) both superposition and homogeneity conditions
(d) associative condition
40. An capacitor with zero initial condition at t = 0+ act as a
(a) short circuit
(b) open circuit
(c) current source
(d) voltage source
41. An inductor stores energy in
(a) electrostatic field
(b) electromagnetic field
(c) magnetic field
(d) core
42. In series LCR circuits, at resonance,
(a) current is maximum, power factor is zero
(b) current is maximum, power factor is unity
(c) current is minimum, power factor is unity
(d) none of above
43. In an RCL series circuit, during resonance, the impedance will be
(a) zero
(b) minimum
(c) maximum
(d) none of above
44. When a source is delivering maximum power to load, the efficiency of the circuit is always
(a) 50%
(b) 75%
(c) 100%
(d) None of above
45. In a linear network, when the ac input is doubled, the ac output becomes
(a) two times
(b) four times
(c) half
(d) one forth
46. A passive network has
(a) current sources but no voltage sources
(b) voltage sources but no current sources
(c) both current and voltage sources
(d) no voltage or current sources
47. Two resistances are connected in parallel and each dissipates 50 waits. The total power
supplied by the source is
(a) 25 watts
(b) 50 watts
(c) 100 watts
(d) 200 watts
48. Three bulbs of 60 watts each are connected is parallel across 220v, 50 Hz supply. If one bulb
burns out
(a) only remaining two will operate
(b) remaining two will not operate
(c) all of three will operate
(d) there will be heavy current from the supply
49. The amplitude of an audio signal is 10 and that of carrier wave is 50. Percentage modulation
(a) 0.2
(b) 20
(c) 5
(d) 60
50. The main advantage of PCM system is:
(a) lower bandwidth
(b) lower power
(c) lower noise

BSNL TTA Question Paper-Electrical Specialization 2007
1. In a D.C. generator, if the brushes are given a small amount of forward shift, the effect of
armature is
a. Totally demagnetizing
b. Totally magnetizing
c. Partly demagnetizing and partly cross magnetizing
d. Totally cross magnetizing
2. The air gap between stator and armature of an electric motor is kept as small as possible
a. To get a stronger magnetic field
b. to improve the air circulation
c. To reach the higher speed of rotation
d. To make the rotation easier.
3. Two series motors are coupled. One motor runs as generator and other as motor. The friction
losses of the two machines will be equal when
a. Both operates at same voltage
b. Both have same back emf
c. Both have same speed
d. both have same excitation
4. Plugging of D.C. motor is normally executed by
a. Reversing the field polarity
b. Reversing the armature polarity
c. Reversing both the armature and field polarity
d. Connecting a resistance across the armature.
5. Transformer oil transformer provides
a. Insulation and cooling
b. B. Cooling and lubrication
c. Lubrication and insulation
d. Insulation, cooling and lubrication
6. Leakage fluxes of transformer may be minimized by
a. Reducing the magnetizing current to the minimum
b. Reducing the reluctance of the iron core to the minimum
c. Reducing the number of primary and secondary turn to the minimum
d. Sectionalizing and interleaving the primary and secondary windings
7. Electric power is transformed upon one coil to other coil in a transformer
a. Electrically
b. Electro Magnetically
c. Magnetically
d. Physically
8. The most suitable and economical connection for small high voltage transformer isa.
Star- Delta connection
b. Delta- Delta connection
c. Delta- Star connection
d. Star- Star connection
9. An alternator is said to be over excited when it is operating at
a. Unity power factor
b. Leading power factor
c. Lagging power factor
d. Either lagging or leading power factor
10. In an A.C. machine, the armature winding is kept stationary while the field winding is kept
rotating for the following rason
a. Armature handles very large currents and high voltages
b. Armature friction involving deep slots to accommodate large coils is easy if armature is kept
c. Ease of cooling the stator than rotor
d. None of the above.
11. In a synchronous motor, the torque angle is the
a. Angle between the rotating stator flux and rotor poles
b. Angle between the magnetizing current and back emf
c. Angle between the supply voltage and back emf
d. None of the above
12. A 3-phase synchronous motor is said to be "floating" when it operates
a. On no load and without loss
b. On constantly varying load
c. On pulsating load
d. On high load and variable supply voltage
13. Speed of synchronous motor depends upon
a. Number of poles
b. Supply frequency
c. Both (a) and (b)
d. Neither (a) nor (b)
14. Imbalance in the shaft of an induction motor occurs due to
a. Slip rings
b. Overheating of winding
c. Non uniform of air gap
d. Rigid consturcion
15. Squirrel cage induction motor has
a. Zero starting torque
b. Very small starting torque
c. Medium starting torque
d. Very high starting torque
16. The principle of operation of a 3-phase induction motor is similar to that of a
a. Synchronous motor
b. Repulsion - start induction motor
c. Transformer with a shorted secondary
d. Capacitor - start, induction - run motor
17. The speed/load characteristics of a universal motor are similar to those
a. D.C. shunt motor
b. D.C. series motor
c. A.C. motor
d. None of the above
18. Single phase A.C. motor generally used for vacuum cleaners is
a. Universal motor
b. Repulsion motor
c. Hysteresis motor
d. Reluctance motor
19. Buchholz relay is used for the protection of
a. Switch yard
b. Transformers
c. Alternators
d. Transmission lines
20. The type of braking used in traction system is
a. Mechanical braking
b. Electro - pneumatic braking
c. Vacuum braking system
d. All the above
21. The function of processing zenger diode in a UJT circuit used for triggering of SCRs is to
a. Expedite the generation of triggering pulses
b. Delay the generation of triggering pulses
c. Provide a constant voltage to UJT to prevent erratic firing
d. Provide a variable voltage to UJT as the source voltage changes
22. The frequency of a ripple in the output voltage of a 3 - phase semi converter depends upon
a. Firing angle and load resistance
b. Firing angle and supply frequency
c. Firing angle and load inductance
d. Only on load circuit parameters
23. The SCR is turned off when the anode currents falls below
a. Forward current rating
b. Break - over voltage
c. Holding current
d. Latching
24. V4 characteristics of emitter of a UJT is
a. Similar to CE with linear and saturation region
b. Similar to FET with a linear and pinch of region
c. Similar to tunnel diode in some respects
d. Linear between the peak point and valley point
25. A transformer works on
a. DC
b. AC
c. AC & DC both
d. Neither AC not DC
26. Which of the following device is used in transformer?
a. Tube light
b. Electric heater
c. Mobile phone
d. Rectifier module
27. Earth electrodes can be in the form of
a. rods or piper
b. stripes
c. plates
d. any of above
28. Carbone or metal brushes are used in
a. DC generators only
b. AC generators only
c. Both AC & DC generation
d. None of above
29. Energy is lost due to Joule's heating effects in winding of transformer. This is called
a. Copper loss
b. Eddy current loss
c. Flux loss
d. None
30. In refrigeration cycle heat is lost in
a. Cooling coil
b. Condenser
c. Compressor
d. Expansion valve
31. The power factor of AC circuit is
a. R/X
b. R/Z
c. Z/R
d. Zero
32. Silicon controlled output is good if ripple factor is
a. Switch
b. Transformer
c. Amplifier
d. None of above
33. The rectifier output is good if ripple factor is\
a. More
b. Less
c. Constant
d. None of above
34. Protective relays can monitor large AC current by means of
a. Current transformer
b. Potential transformer
c. Micro transformer
d. None of above
35. The combines AM of two similar batteries connected in parallel is:
a. halved
b. doubled
c. remain constant
d. none of above
36. The current in circuit having 5 V EMI source and 10 Ohm resistance is:
a. 2 Amp
b. 50 Amp
c. 5 Amp
d. ˝ Amp
37. The chopper is a device to change
a. Voltage
b. Current
c. Frequency
d. None of these
38. The power consumption, in case of centrifugal loads (like pump, fan, blower etc) is
proportional to:
a. speed
b. square of speed
c. cube of speed
d. none of these
39. Which of these need to be measured after rewinding the motor:
a. no load current
b. air gap
c. winding resistance
d. all of the above
40. Five percent increase in supply frequency will change the synchronous speed of motor by:
a. -5%
b. +5%
c. -10%
d. +10%
41. Which of the following is the best inverter?
a. square wave inverter
b. sine wave inverter
c. pure sine wave inverter
d. triangular wave inverter
42. For driving a motor in a tape recorder or record player, the motor used is generally:
a. a synchronous motor
b. a hydraulic motor
c. an induction motor
d. a dc series motor
43. The DC motor starter used with a constant speed shunt motor is:
a. 2 point starter
b. 3 point starter
c. 4 point starter
d. 5 point starter
44. A commutator in a DC motor converts
a. AC to DC
b. DC to AC
c. Both AC to DC and DC to AC
d. None of these
45. Two transformers running in parallel will share the load according to their:
a. leakage reactance
b. pu impedance
c. efficiency
d. rating
46. The size of the Earth Wire is determined by:
a. the ampere capacity of the service wires
b. the atmospheric conditions
c. the voltage of service wires
d. none of these
47. The function of lightning arrester is:
a. to limit the short circuit fault current
b. to provide path to high voltage surge to earth
c. to reduce arcing
d. none of these
48. Surge protector provide:
a. high impedance to normal voltage
b. low impedance to surge
c. both (a) and (b)
d. none of these
49. Earthing is necessary to give protection against
a. voltage fluctuation
b. overloading
c. danger of electric shock
d. high temperature of conductors
50. The primary function of fuse is to
a. protect the appliance
b. open the circuit
c. prevent excessive current
d. protect the line
Answered By StudyChaCha Member
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