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ssc je electrical question paper 2017



EXAM NAME: SSC JE Examination 2017

QID: 401  - Which of the following statements about the zinc-carbon cell is true? Which of the following statements for Zinc-Carbon Cell is true?
Options:
1 ) The zinc container has a potential of 1.5 V against the carbon electrode. The potential in the zinc container against the carbon electrode is 1.5V.
2 ) The air in the air space needed for the oxidation of zinc. Oxidation of zinc requires air in the air space.
3 ) When the current is drawn from  the cell, the carbon rod is partly consumed. When the stream flows from  the cell, then  the carbon rod is partially  erosion.
4 ) The depolarizer mainly  contains brown  iron ore and  carbon powder. The depolariser mainly  consists of brown  iron ore and  carbon powder.
Correct Answer: The depolarizer mainly  contains brown  iron ore and  carbon powder. The depolariser mainly  consists of brown  iron ore and  carbon powder.
QID: 402  - The capacitor, commonly used for ceiling  fan motors has a value  of 2.3 μF. The type of capacitor is used                   . The capacitor used for the ceiling  wings motor is 2.3 μF. The capacitor used is usually of          type.
Options:
L ) Paper Capacitor paper Capacitor
2 ) Electrolyte Capacitor
Vidayut lytic capacitor (electrolytic capacitor)
3 ) Parallel Plate With Mica Dielectric
parallel plate including mica Pravadayut (dielectric)
4 ) None  Of These
None  of these
Correct Answer: Paper capacitor paper capacitors

QID: 403 - Coulomb's law for the force with electric charges closely resembles with                               
Coulomb's law, which  seems to be the force of energy between the electric charges, corresponds to approximately               . Of
Options:
1 ) Newton's law of motion
'Newton's speed' rule
2 ) Law of conservation of energy
'Energy conservation' rule
3 ) Gauss's theory
'Gauss theorem'
4 ) 'Newton's law of gravitation'
'Newton's gravitational rule'
Correct Answer: 'Newton's law of gravitation'
'Newton's gravitational rule'
QID: 404  - The potential inside a charged hollow sphere is                     . Potential will be          between charged hollow shells.
Options: 

 1) Zer
2 ) Same As That On The Surface surface similar
3 ) Less Than  That On The Surface surface at
4 ) None  Of These
None  of these
Correct Answer: Same as that  on the surface
Similar to surface
QID: 405  - A capacitor of 40 μF is charged to a potential difference of 500 volts.  The charge acquired by the capacitor, in Coulomb's, is                     . A 40 μF capacitor was charged up to 500 volts.  How much will be done by the capacitor, in Coulomb?
Options:
1 ) 2.2
2 ) 2
3 ) 0.22
4 ) 0.02
Correct Answer: 0.02

QID: 406  - Which of the following capacitors will have  low energy stored in it?

Which of the following capacitors will have  the lowest energy accumulated?
Options:
1 ) A 500 pF capacitor charged to 10kV
10 kV charged up to 500 pF in a capacitor
2 ) A 1 μF capacitor, charged up to 5kV
5 kV in a capacitor of 1 μF charged
3 ) A 40 μF capacitor charged to 400 In
a capacitor of 40 μF charged up to V 400 V
4 ) All will have  same energy stored all the same energy will be stored
Correct Answer: A 500 pF capacitor charged to 10kV
10 kV तक आवेशत 500 pF एक संधार

QID : 407  - The lines  of force due  to charged particles are                    .

Options:
1) always straight
2) always curved

3) sometimes curved
4) None  of these
Correct Answer: always curved

QID : 408  - A capacitor can  be represented by a capacitance and  a resistance in parallel. For a good capacitor, this  parallel resistance is                    .
1) Very high
2) Very low
3) Low
4) None  of these
Correct Answer: Very high

QID : 409  - An electric charge moves with a constant velocity(v) parallel to the lines  of force of a uniform magnetic field B.The force experienced by the charge is                  .

Options:
1) eVB
2) e/BV
3) eV/B
4) 0
Correct Answer: 0

QID : 410  - In which  of the following appliances  is the heating effect used?

Options:
1) Electric  motor

2) Transformer

3) Electric  furnace

4) Generator

Correct Answer: Electric  furnace



QID : 411  - A voltage of 100 V is applied to a circuit  of resistance of 10 Ω, the power dissipated (in watts) by the resistance will be                    .

Options:
1) 100
2) 500
3) 1000
4) 1500
Correct Answer: 1000

QID : 412  - Energy consumed by an electric iron of rating 1000  W as compared to 750 W will be                    .


1) More
2) Less
3) Half
4) Same
Correct Answer: More

QID : 413  -
















QID : 415  - The value  of temperature coefficient of resistance of a given conductor                   .

Options:
1) is different at different given temperatures
2) is same at different given temperatures
3) increases as temperature is increased
4) remains always constant
Correct Answer: is different at different given temperatures

QID : 416  - The condition in Ohm's law is that                      .



1) the temperature should remain constant
2) ratio  of V/I should be constant
3) the temperature should vary
4) current should be proportional to voltage
Correct Answer: the temperature should remain constant

QID : 417  - Which of the following wires has the highest resistance?

Options:
1) Copper wire of 5 m and  2mm2
2) Copper wire of 1 m and  6 mm2

3) Aluminium wire of 8 m and  1 mm2
4) Aluminium wire of 1 m and  6 mm2
Correct Answer: Aluminium wire of 8 m and  1 mm2






QID : 419  - A magnet is able  to attract             .

Options:
1) Iron, aluminium and  brass
2) Iron, cobalt and  zinc
3) Iron, copper and  nickel
4) Nickel, cobalt and  steel
Correct Answer: Nickel, cobalt and  steel

QID : 420  - What is meant by magnetic saturation of iron?

Options:
1) Strengthening of the magnetic field by using iron (permeability)
2) The part  of the magnetization curve  in which  the change in magnetic field strength H causes a little change in the magnetic flux density B.
3) The losses during  magnetization
4) In the region of saturation the elementary magnets are not yet arranged fully
Correct Answer: The part  of the magnetization curve  in which  the change in magnetic field strength H causes a little change in the magnetic flux density B.


QID : 421  - α-cut off frequency of a bipolar junction transistor increases                   .

Options:
1) with the increase in base width
2) with the increase in collector width
3) with the increase in temperature
4) with the decrease in base width
Correct Answer: with the increase in base width

QID : 422  - A class A transformer coupled, transistor power amplifier is required to deliver a power output of 10 watts. The maximum power rating of the transistor should not be less than                  .
Options:
1) 5 W

2) 10 W

3) 20 W

4) 40 W
Correct Answer: 20 W

QID : 423  - A switched mode power supply operating at 20kHz to 100kHz range uses as the main  switching element is                     .

Options:
1) Thyristor
2) MOS FET
3) Triac
4) UJT
Correct Answer: MOS FET
QID : 424  - The diffusion potential across a p-n junction                     
Options:
1) decreases with increasing doping concentration
2) increases with decreasing band gap
3) does not depend on doping concentrations
4) increases with increase in doping concentrations
Correct Answer: increases with increase in doping concentrations

QID : 425  - As compared to a full-wavrectifier using two diodes, the four diode bridge rectifier has the dominant advantage of                     .

Options:
1) higher current carrying capacity
2) lower peak inverse voltage requirement
3) lower ripple factor
4) higher efficiency
Correct Answer: lower peak inverse voltage requirement
QID : 426  - In DC shunt motor, if the terminal voltage is reduced to half and  torque remains the same then                      .


1) speed will be half and  armature current also will be half
2) speed will be half but armature current remains the same
3) speed will be half and  armature current becomes double
4) speed and  armature current will remain the same
Correct Answer: speed will be half and  armature current becomes double
QID : 427  - The exciting coils  of any DC machine are wound                   .

Options:
1) in the machine
2) in the armature slots
3) around the poles
4) separately
Correct Answer: around the poles

QID : 428  - Which of the following DC motors has the least drop  in speed between no load  to nominal load?

Options:
1) Shunt motor with commutating poles
2) Series motor without commutating poles
3) Compound motor without commutating poles
4) Series motor with commutating poles
Correct Answer: Shunt motor with commutating poles

QID : 429  - Which of the following motors is used to derive  the constant speed line shafting lathes, blowers and  fans?

Options:
1) DC shunt motor
2) DC series motor
3) Commutative compound motor
4) None  of these
Correct Answer: DC shunt motor

QID : 430  - If the field of a DC shunt motor is opened             .

Options:
1) It will continue to run at its rated speed
2) The speed of the motor will become very high
3) The motor will stop
4) The speed of the motor will decrease
Correct Answer: The speed of the motor will become very high


QID : 431  - When the electric train is moving down  a hill the DC motor acts as                  .


1) DC series motor


2) DC shunt motor
3) DC series generator
4) DC shunt generator
Correct Answer: DC series generator
QID : 432  - Resistivity measurements are often used to determine                   .

Options:
1) carrier concentration in intrinsic semiconductor
2) carrier concentration in extrinsic semiconductor
3) life time  of polycrystalline materials
4) None  of these
Correct Answer: carrier concentration in extrinsic semiconductor
QID : 433  - in Ge, when  atoms are held together by the sharing of valence electrons                   
Options:
1) each shared atom leaves a hole
2) valence electrons are free  to move away  from  the nucleus
3) valence electrons form  irreversible covalent bands
4) valence electrons form  reversible covalent bands
Correct Answer: valence electrons form  reversible covalent bands

QID : 434  - In a pure  semiconductor, electric current is due  to                     .

Options:
1) holes alone
2) electrons alone
3) both  holes and  electrons
4) valence electrons alone
Correct Answer: both  holes and  electrons

QID : 435  - Temperature coefficient of resistance in a pure  semiconductor is                     .

Options:
1) zero
2) positive
3) negative
4) dependent on size  of specimen
Correct Answer: negative

QID : 436  - Acceptor impurity  atoms in a semiconductor result in new                     .


1) wide energy band
2) narrow energy band
3) discrete energy level just below  conduction level
4) discrete energy level just above valence level
Correct Answer: discrete energy level just above valence level

QID : 437  - An n-type semiconductor is               .

Options:
1) positively charged
2) negatively charged
3) electrically neutral
4) not used in semiconductor devices
Correct Answer: electrically neutral

QID : 438  - When a free  electron is recaptured by a hole, the process is called                   .

Options:
1) recombination
2) diffusion
)
3) drift
4) restoration
Correct Answer: recombination
QID : 439  - Imperfections in the crystal structure result in                     .

Options:
1) increased conductivity
2) decreased conductivity
3) increased mobility
4) decreased mobility
Correct Answer: decreased mobility
QID : 440  - At room temperature intrinsic carrier concentration is higher in germanium than in silicon because                   .

Options:
1) carrier mobilities are higher Ge than in Si
2) energy gap  in Ge is smaller than that  in Si
3) Atomic  number of Ge is larger  than in Si

4) Atomic  weight of Ge is larger  than in Si


Correct Answer: energy gap  in Ge is smaller than that  in Si
QID : 441  - Epitaxial  growth is best suited for growing                   .


1) Polycrystalline silicon
2) very thin single crystal layer on a substrate
3) single crystals several inches in size
4) single crystal of several mm  in size
Correct Answer: very thin single crystal layer on a substrate





QID : 444  - Two parallel wires separated by a distance 'd' are carrying a DC current 'I' in the same direction. The magnetic field along a line running parallel to these wires and  midway between them                   .

Options:
1) depends upon  I
2) is zero
3) depends upon  d
4) depends upon  the permeability of the medium between the wires
Correct Answer: is zero

QID : 445  - A water boiler of home is switched on to the a.c.  mains supplying power at 230 V/50 Hz. The frequency of instantaneous power consumed by the boiler is
                    .


1) 0 Hz

2) 50 Hz

3) 100 Hz

4) 150 Hz

Correct Answer: 100 Hz


QID : 446  - The energy stored in the magnetic field at a solenoid 30 cm long and  3 cm diameter wound with 1000  turns of wire carrying a current at 10 A, is                     .

Options:
1) 0.015 Joules
2) 0.15  Joules
3) 0.5 Joules
4) 1.15  Joules
Correct Answer: 0.15  Joules
QID : 447  - The impulse response of an R-L circuit  is a                  .


Options:
1) rising  exponential function
2) decaying exponential function
3) step function
4) parabolic function
Correct Answer: decaying exponential function

QID : 448  - A passive 2-port  network is in a steady-state. Compared to its input, the steady state output can  never  offer                 .


Options:
1) higher voltage
2) lower impedance
3) greater power
4) better regulation
Correct Answer: greater power

QID : 449  - Which among these is a type of batten wiring?

Options:
1) Metal  sheathed wiring
2) TRS or PVC wires
3) Both metal sheathed wiring and  TRS or PVC wires
4) None  of these
Correct Answer: Both metal sheathed wiring and  TRS or PVC wires




Correct Answer: an ideal impulse



QID : 451  - The value  of current at resonance in a series RLC circuit  is affected by the value  of                 .


Options:
1) R
2) C
3) L
4) All options are correct

Correct Answer: R

QID : 452  - A single-phase motor is made self-starting by the addition of a/an               .

Options:
1) running winding
2) starting winding
3) electric starter
4) autotransformer
Correct Answer: starting winding


QID : 453  - If all the stator coils  of a motor are connected for the same magnetic polarity, there will be formed an equal number of                 .

Options:
1) consequent poles with opposite polarity
2) consequent poles with the same polarity
3) rotor  poles with opposite polarity
4) rotor  poles with same polarity
Correct Answer: consequent poles with opposite polarity

QID : 454  - Before a capacitor-start motor can  reverse its direction of rotation, the                 .

Options:
1) centrifugal switch must be opened
2) running winding  must be opened
3) starting winding  must be connected to the line
4) capacitor connections must be changed
Correct Answer: starting winding  must be connected to the line

QID : 455  - A repulsion start induction-run motor runs  as an induction motor when  the                 .


Options:
1) commutator segments are short circuited
2) brushes are shifted to a neutral plane
3) shorting devices are disconnected
4) stator connections are reversed
Correct Answer: commutator segments are short circuited

QID : 456  - The repulsion motor starts and  runs  as a              .

Options:
1) split-phase motor

2) capacitor-start motor
3) repulsion motor
4) compound motor
Correct Answer: repulsion motor

QID : 457  - Changing the electrical connections to reverse the direction of rotation of a motor running at full speed is called               .

Options:
1) slugging
2) plugging
3) dynamic braking
4) brush shifting
Correct Answer: plugging

QID : 458  - Multiplication features are incorporated in an ohmmeter to enable the meter to                 .

Options:
1) measure very high resistance values
2) measure values with the least error
3) be multipurpose in its application
4) has less power consumption

Correct Answer: measure values with the least error
QID : 459  - More power is required to operate a moving-iron meter than a PM-MC meter because of the magnetic circuit's high            .
Options:
1) resistance
2) reluctance

3) retentivity

4) resilience

Correct Answer: reluctance

QID : 460  - A rectifier is used in an instrument for the purpose of                 .


1) measuring high voltage values
2) measuring high current values
3) converting Ac into DC
4) making the instrument more stable
Correct Answer: converting Ac into DC

QID : 461  - What does the reading of the first dial on the right of a 4-dial watt  hour meter indicate?

Options:
1) Number of single units
2) Total watts each hour
3) Maximum value  the meter can  register
4) Multiplier value  of the preceding dial
Correct Answer: Number of single units

QID : 462  - A demand meter is a means of indicating which  of the following?

Options:
1) Peak power periods
2) A high load  factor
3) Low kWh consumption
4) All options are correct
Correct Answer: All options are correct

QID : 463  - An industrial analyzer is NOT suitable for measuring which  of the following?

Options:
1) Power

2) Resistance

3) Current

4) Power factor

Correct Answer: Resistance


QID : 464  - A multimeter is often called a VOM, which  is an abbreviation of volt-ohm                .

Options:
1) meter

2) megameter

3) milliammeter

4) microammeter

Correct Answer: milliammeter


QID : 465  - Which of the following is measured with a wheat stone bridge?



1) Current

2) Resistance

3) Voltage

4) Power

Correct Answer: Resistance


 Correct Answer: R3


QID : 467  - What is the most simple electrical indicating instrument used on a control panel?

Options:
1) DC voltmeter
2) AC ammeter
3) Synchroscope
4) Light bulb
Correct Answer: Light bulb

QID : 468  - Under full load  running condition, the slip of a synchronous motor is                 .

Options:
1) zero

2) about 0.2

3) about 0.01

4) None  of these

Correct Answer: zero


QID : 469  - Synchronous motors generally have                  .


Options:
1) cylindrical rotor
2) salient pole rotor
3) Both cylindrical and  salient pole rotor
4) None  of these
Correct Answer: salient pole rotor

QID : 470  - The power output of a synchronous motor is                 .


1) directly  proportional to synchronous reactance
2) inversely proportional to synchronous reactance
3) independent of synchronous reactance
4) None  of these
Correct Answer: inversely proportional to synchronous reactance

QID : 471  - The short-circuit characteristic of an alternator is                 .

Options:
1) always linear

2) always non-linear

3) sometimes linear  and  sometimes non-linear
4) None  of these
Correct Answer: always linear

QID : 472  - The ratio  of armature leakage reactance to synchronous reactance of a large  size  modern alternator is about               .

Options:
1) 0.05

2) 0.2

3) 0.6

4) 0.8
Correct Answer: 0.2

QID : 473  - High speed alternators usually have                  .

Options:
1) salient pole rotors
2) cylindrical rotors
3) both  salient pole and  cylindrical rotors
4) None  of these
Correct Answer: cylindrical rotors

QID : 474  - Compared to the secondary of a loaded step-up transformer, the primary has               .

Options:
1) lower voltage and  higher current
2) higher voltage and  lower current
3) lower voltage and  lower current
4) higher voltage and  higher current
Correct Answer: lower voltage and  higher current

QID : 475  - Under operating conditions the secondary of a current transformer is always short circuited because               .

Options:
1) It protects the primary circuits
2) It is safe to human beings
3) It avoids core  saturation and  high voltage induction
4) None  of these
Correct Answer: It avoids core  saturation and  high voltage induction



QID : 476  - During short-circuit test, the iron loss of a transformer is negligible because               .

Options:
1) the entire input  is just sufficient to meet copper losses only
2) voltage applied across the HV (High Voltage) side  is a small fraction of the rated voltage and  so its flux
3) iron core  becomes fully saturated

4) supply frequency is held constant

Correct Answer: voltage applied across the HV (High Voltage) side  is a small fraction of the rated voltage and  so its flux

QID : 477  - When a 400-Hz  transformer is operated at 50 Hz, its kVA rating is                 .

Options:
1) reduced to 1/8

2) increased 8 times
3) unaffected
4) determined by load  on secondary
Correct Answer: reduced to 1/8


QID : 478  - The ordinary efficiency of a given transformer is maximum when                  .

Options:
1) it runs  at half full- load
2) it runs  at full-load
3) its copper loss equals iron loss
4) it runs  overload
Correct Answer: its copper loss equals iron loss

QID : 479  - While conducting short-circuit test on a transformer the following side  is short-circuited                .

Options:
1) HV side
2) LV side
3) primary side

4) None  of these

Correct Answer: LV side


QID : 480  - In transmission lines  the cross-arms are made of                 .

Options:
1) wood

2) steel

3) RCC

4) copper

Correct Answer: steel


QID : 481  - For a particular kW rating of an induction motor, the kVAR rating of the shunt capacitor required is                 .


1) more for high rated speed motor
2) more for lower rated speed motor
3) independent of speed
4) None  of these
Correct Answer: more for lower rated speed motor

QID : 482  - The main  criterion for the design of a distributor is                 .

Options:
1) voltage drop


2) Corona loss

3) Temperature rise
4) All options are correct
Correct Answer: voltage drop

QID : 483  - What is the value  of the magnetic vector potential due  to an infinitesimally small current element, evaluated at infinite  distance from  it?

Options:
1) Infinity

2) Unity

3) Zero

4) Any number between zero  and  infinity depending on the strength of the current element
Correct Answer: Zero


QID : 484  - The minimum permissible size  of the aluminum cable for lighting  circuits is                 .

Options:
1) 1.1 sq.  mm

2) 1.5 sq.  mm

3) 2.4 sq.  mm

4) 3.6 sq.  mm

Correct Answer: 1.5 sq.  mm


QID : 485  - Which of the following distribution system is used for combined power and  lightning load?

Options:
1) Single  phase 2-wire AC system
2) Three  phase, 3-wire AC system
3) Three  phase, 4-wire AC system
4) None  of these
Correct Answer: Three  phase, 4-wire AC system


QID : 486  - The law that  induces e.m.f.  and  current always oppose the cause which  produces it, is discovered by                 .

1) Faraday

2) Lenz

3) Maxwell

4) Leonard

Correct Answer: Lenz


QID : 487  - In which  of the following appliance does the heating effect of current appear as an undesirable side  effect?

Options:
1) Immersion heater
2) Electric  Iron

3) Vacuum cleaner
4) Electric  oven
Correct Answer: Vacuum cleaner

QID : 488  - Upon which  of the factors does the voltage drop  depend?

Options:
1) Only upon  the resistance of the conductor
2) Only upon  the length and  the specific resistance of the conductor
3) Upon the cross-section area and  the conductivity of the conductor
4) Upon the resistance of the conductor and  the current flowing  through it
Correct Answer: Upon the resistance of the conductor and  the current flowing  through it

QID : 489  - In a parallel circuit  the potential difference across the resistance               .

Options:
1) Varies
2) Is different from  the applied voltage
3) None  of the these
4) Is always constant
Correct Answer: Is always constant

QID : 490  - Two electric presses are connected in parallel. The resistance of the first press is 100 Ω and  that  of the second is 300 Ω. The total  current taken by both the presses is 4 A. The ratio  of currents taken by first: second will be equal to                 .


Options:
1) 1 : 3
2) 2 : 3
3) 3 : 1.2
4) 3 :1
Correct Answer: 3 :1

QID : 491  - In addition to the actual running time  between stops, the speed of the train that  is estimated taking  into account the time  of stop at a station, is known as             .

Options:
1) Average speed
2) Scheduled speed
3) Notching speed
4) Free running speed
Correct Answer: Scheduled speed
QID : 492  - Which of the following statements is true?

Options:
1) A composite system consists of a combination of diesel engine and  DC series motor.
2) A composite system consists of a combination of diesel engine and  AC single-phase motor.
3) In a composite system single-phase power received is converted into DC or three phase power AC system.
4) A composite system consists of use of combination of DC and  AC motors on the same locomotive.
Correct Answer: In a composite system single-phase power received is converted into DC or three phase power AC system.


QID : 493  - In case of DC series motor it is possible to have  finite no load  speed               .

Options:
1) if a resistance is connected across its filed terminals
2) if a resistance is connected across its armature terminals
3) if a resistance is connected across its field and  armature together
4) None  of these
Correct Answer: if a resistance is connected across its armature terminals

QID : 494  - Why is electric braking preferred?

?
Options:
1) It is smooth
2) Its maintenance cost is less
3) The energy is saved in regenerating braking
4) All options are correct

Correct Answer: All options are correct

QID : 495  - If the designation of Indian  Railways locomotive is known  as WAM1, then  in this  the letter W indicates which  of the following?


Options:
1) The locomotive is to run on broad gauge track.
2) The locomotive is to run on metre gauge track.
3) The locomotive is for shunting duty.
4) The locomotive is for goods train only.
Correct Answer: The locomotive is to run on broad gauge track.

QID : 496  - What should be the minimum depth of trench from  the ground level for cables carrying a voltage between 3.3 kV and  11 kV?


Options:
1) 0.75  m plus  radius of complete cable

2) 0.45  m plus  radius of complete cable

3) 1.0 m plus  radius of complete cable

4) All options are correct
Correct Answer: 0.75  m plus  radius of complete cable


QID : 497  - The induction motors develop which  of the following at low frequency of the order  1/2 Hz to 10 Hz?

Options:
1) High starting torque with excessive starting current
2) High starting torque without excessive starting current
3) Low starting torque with excessive starting current
4) Low starting torque without excessive starting current
Correct Answer: High starting torque without excessive starting current

QID : 498  - A rectifier for welding has voltage/current characteristic as               .

Options:
1) drooping
2) rising
3) static

4) variable

Correct Answer: drooping


QID : 499  - What is the purpose of using Argon in Argon arc welding?

Options:
1) to prevent oxidation of metal by coming in contact with oxygen of air
2) to create inert atmosphere around the job to be welded
3) to obviate the necessity for using flux

4) All options are correct

Correct Answer: All options are correct

QID : 500  - The power factor of load  using welding transformer least depends on                 .

Options:
1) Arc length
2) Type of electrode
3) Number of operation
4) Material to be welded
Correct Answer: Material to be welded


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