Tradesman Electronics - Technical Education 345/2016 Answer Key 61/2017

circuit driver card

Post : Tradesman Electronics
Department : Technical Education
Category Code : 345/16
Qualifications : THSLC with specialization in the appropriate trade; SSLC + NTC, KGC, VHSE in the appropriate trade
Question Paper Code : 061/17
Date of Test : 26-05-2017


  1. Cross over distortion will occur in
    • Push pull amplifiers
    • Complementary symmetry amplifiers
    • Emitter follower
    • Single-stage amplifiers

  2. In MOD-10 counter, how many flip-flop are cascaded?
    • 2
    • 4
    • 3
    • Any number

  3. The reverse saturation current of a Ge P.N. junction doubles for every °C rise in ambient temperature
    • 1°C
    • 2°C
    • 10°C
    • None of these

  4. Memory that loses its contents when power is lost
    • Nonvolatile
    • Volatile
    • Random
    • Static

  5. In 8085, the instruction RAL is
    • One byte instruction
    • Two byte instruction
    • Three byte instruction
    • Four byte instruction

  6. Modern FM receivers use de-emphasis circuit for
    • Reducing high frequency noise
    • Reducing the amplitude of high frequencies in the audio signal
    • Increasing the amplitude of higher modulating frequencies
    • Making demodulation easy

  7. For sound portion of TV transmission, deviation ratio is
    • 5
    • 1.67
    • 88
    • 200

  8. Negative feedback reduces distortion in the amplifier only when it
    • comes as part of input signal
    • is generated in it
    • is part of its output
    • exceeds a certain safe level

  9. The unit of dielectric strength is
    • KV/m
    • current/min.
    • ampere/second
    • volts/div.

  10. For insulators, the forbidden energy gap is of the order of
    • 5 eV
    • 1 eV
    • 0.1 eV
    • Zero

  11. In an unbiased junction, the thickness of charge depletion region is of the order of
    • 0.005 μm
    • 0.5 μm
    • 5 μm
    • 10-10 m

  12. Schottky barrier diode can be used as
    • Low noise amplifier
    • Variable capacitance device
    • Power supply rectifier
    • Low level detector

  13. JFET has main drawback of
    • having low input impedance
    • having high output impedance
    • being noisy
    • having small gain-bandwidth product

  14. In voltage amplifiers the load resistance should be
    • as large as possible
    • as small as possible
    • equal to output impedance
    • equal to input impedance

  15. Darlington amplifier circuit is obtained by cascading
    • two emitter follower amplifiers
    • two CB stages
    • two CE stages
    • a CE stage followed by a CB stage

  16. To turn-off or commutate a thyristor
    • gate current is made zero
    • forced commutation is used
    • reverse blocking voltage is applied
    • none of these

  17. Thyristors are not made using germanium, because
    • it is a stable semiconductor
    • group V elements cannot doped with it
    • its current handling capacity is less than silicon
    • it has high leakage current

  18. A tuned amplifiers amplifies
    • a wide band of frequencies
    • audio frequencies only
    • video frequencies only
    • a narrow band of frequencies

  19. Wein bridge oscillator is basically a
    • pulse generator
    • sine wave generator
    • square wave generator
    • triangular wave generator

  20. The ASCII Code is
    • 5 bit code
    • 7 bit code
    • 9 bit code
    • 11 bit code

  21. In 8085μP, the address of the next instruction to be executed, is stored in
    • stack pointer
    • address latch
    • program counter
    • general purpose register

  22. A switched mode power supply operating at 20 KHz to 100 KHz range uses as the main switching element
    • Thyristor
    • MOSFET
    • Triac
    • UJT

  23. Which represents a magnetic transducer?
    • LVDT
    • Strain gauge
    • Thermocouple
    • Photoconductive cell

  24. A UJT with RBB = 10 KΩ and RBZ = 4 KΩ has intrinsic stand-off ratio
    • 0.6
    • 0.4
    • 0.25
    • 5/3

  25. To generate a 1 MHz signal, the most suitable oscillator is
    • Colpitts oscillator
    • Phase-shift oscillator
    • Wein-bridge oscillator
    • None of these

  26. Which material is generally used for LED?
    • Compounds of silica
    • Compounds of phosphorus
    • Compounds of gallium
    • Compounds of sulphur

  27. Which of the following is a unipolar device?
    • P.N. diode
    • FET
    • Zener diode
    • Ordinary transistor

  28. An audio oscillator uses
    • Positive feedback
    • Negative feedback
    • Both positive and negative feedback
    • None of these

  29. The binary equivalent of A16 is
    • 1010
    • 1011
    • 1000
    • 1110

  30. Signal attenuation means is
    • Amplification
    • Transmission
    • Stoppage
    • Weakening

  31. The power factor of a resonant circuit is (series RL
    • 1
    • 0
    • –1
    • 0.5

  32. In a home TV, the lead from the antenna is
    • an ordinary twisted wire
    • a co-axial cable
    • a twin wire fat ribbon of 300 ohms
    • a bare copper wire

  33. HDD stands for
    • High Disk Drive
    • Huge Disk Drive
    • Hard Disk Drive
    • None of these

  34. Voltage for control grid is supplied by
    • EHT
    • Extra applied voltage
    • Received signals
    • None of these

  35. An antenna is a device
    • That converts electromagnetic energy into RF signal
    • That converts RF signal into electromagnetic energy
    • That converts guided EM waves into free space EM waves and vice versa
    • None of these

  36. To connect several microphones, PA amplifier system required
    • Amplifier
    • Mixture
    • Woofer
    • Tweeters

  37. VHF range is between
    • 30 – 30000 MHz
    • 3 – 40 MHz
    • 30  – 300 MHz
    • 3 – 300 MHz

  38. The two colour different signal is designated as in PAL
    • X and Y signals
    • U and V signals
    • I and Q signals
    • P and Q signals

  39. The Parabolic Dish Antenna (PD gain in dbs is
    Question error

  40. The material used for making permanent magnet in PMMC is
    • Aluminium
    • Alnico
    • Alloy of iron and aluminium
    • Iron

  41. By using Boolean algebra A+A̅
    • A
    • 0
    • 1

  42. The antenna is matched to the RF amplifier by help
    • transformer
    • small transmission line
    • balun
    • coupled circuit

  43. What is the type active component used in electronic tuning?
    • Varactor diode
    • PIN diode
    • Tunnel diode
    • Schottky diode

  44. LNBC stands for
    • Low Noise Broadcasting Converter
    • Low Noise Broadband Converter
    • Low Noise Blocking Converter
    • Low Noise Blockdown Converter

  45. In the truth table of JK flip-flop, the condition J = K = 1 represents
    • set
    • reset
    • toggle
    • no change

  46. The heart of oscilloscope is
    • power supply
    • vertical amplifier
    • horizontal amplifier
    • cathode ray tube

  47. The technique used to generates HV in EHT is
    • split addition
    • split subtraction
    • multiplexer
    • extra multi winding

  48. A bistable circuit used to produce a rectangular output waveform is
    • Astable
    • R-S flip-flop
    • Schmitt trigger
    • Shift register

  49. I AM radio receiver; the detection process is done by using
    • Foster seeley discriminator
    • Ratio detector
    • Diode detector
    • Quadrature detector

  50. The I.F. (Intermediate Frequency) of F.M. radio receiver is
    • 10.7 MHz
    • 455 KHz
    • 33.4 MHz
    • 20 KHz

  51. The frequency of oscillation of RC phase shift oscillator is
    Question error

  52. Zener diodes are
    • forward biased and heavily doped
    • forward biased and lightly doped
    • reverse biased and heavily doped
    • reverse biased and lightly doped

  53. The ability of a material to hold its magnetism after the magnetizing force has been removed
    • Hysteresis
    • Coercive force
    • Retentivity
    • Permeability

  54. The reciprocal of resistance
    • Permeance
    • Hysteresis
    • Conductance
    • Reluctance

  55. SCR has
    • P-N-P-N layers
    • N-P-P-N layers
    • P-P-N-P layers
    • P-N-P-N layers
    Question error

  56. Band II (88-108 MHz) is used for
    • AM radio broadcasting
    • FM radio broadcasting
    • Television broadcasting
    • Defence Communication

  57. The basic building block of any counter is
    • AND gate
    • OR gate
    • NAND gate
    • Flip-flop

  58. Kirchhoff’s voltage law is concerned with
    • IR drops
    • Junction voltages
    • Battery e.m.fs.
    • Both IR dropsand Junction voltages
    Question error

  59. Ferrite cores commonly used at high frequencies
    • Increase core losses
    • Decrease core losses
    • Decrease inductance
    • Increase inductance

  60. Rating of a battery is usually expressed in
    • Watt-hour
    • Joule
    • Ampere-hour
    • Amperes

  61. The average value of an A.C. current wave given by i = 100 sin100πt is
    • 70.7
    • 141.4
    • 157
    • 63.7

  62. Resonance curve shows the variation of circuit current with
    • Voltage
    • Power
    • Frequency
    • Impedance

  63. The time constant of RL circuit is
    • λ = RC seconds
    • λ = L/R seconds
    • λ = 1/RC seconds
    • λ = 63.3% × RC seconds

  64. Avalanche breakdown is primarily dependent on the phenomenon of
    • Collision
    • Doping
    • Ionisation
    • Recombination

  65. The depletion region of a junction is formed
    • During the manufacturing process
    • When forward bias is applied to it
    • When reverse bias is applied to it
    • When its temperature is reduced

  66. The acceptor impurities are
    • Antimony
    • Boron
    • Germanium
    • Carbon

  67. Depletion region of P-N junction contains
    • Immobile ions
    • Negatively charged electrons
    • Electrons and holes
    • None of these

  68. Counters can be also used for measurement of
    • Voltage
    • Current
    • Phase relationships
    • Frequency

  69. The negative resistance characteristic is in
    • Zener diode
    • Tunnel diode
    • PIN diode
    • LED

  70. A coil has XL = 1000Ω. If both its inductance and frequency are doubled, its reactance will becomes
    • 2000
    • 500
    • 250
    • 4000

  71. Q-factor of parallel circuit is

  72. Co-efficient of coupling measured in

  73. A circuit with many inputs but only one output
    • Multiplexer
    • Decoder
    • Demultiplexer
    • Encoder

  74. The method of winding of inductor
    • Honey comb
    • Toroid
    • Series-opposition
    • Both Honey comb and Toroid

  75. One henry =

  76. The torque which stops the oscillations of the pointer of an instrument is called
    • Controlling torque
    • Damping torque
    • Deflection torque
    • Spring control

  77. A photosensitive resistor is
    • Photovoltaic cell
    • Thermistor
    • VDR
    • LDR

  78. Specific gravity is measured by
    • Hydrometer
    • Lactometer
    • Barometer
    • Ammeter

  79. The ripple frequency of a full-wave rectifier is
    • 50 Hz
    • 100 Hz
    • 60 Hz
    • 200 Hz

  80. A frequency converter stage in radio receiver contains
    • Mixer and local oscillator
    • R. F. amplifier and mixer
    • I. F. amplifier and detector
    • Mixer

  81. Indian Penal Code is not applicable at
    • Goa
    • Jammu and Kashmir
    • Nagaland
    • Mizoram

  82. When did Kerala Legislative Assembly passed Malayalam Bhakha bill for promoting and enrich Malayalam language?
    • 2015 Dec.17
    • 2015 Feb. 21
    • 2016 May 6
    • 2016 June 1
    Question error

  83. Which animal is the symbol of the ‘Make in India’ initiative?
    • Bull
    • Tiger
    • Lion
    • None of these

  84. Who was the first Indian President to die in office?
    • Rajendra Prasad
    • K.R. Narayan
    • Sail Singh
    • Zakir Hussain

  85. Which agitation in Kerala is known as the ‘Marumarakkal Samaram’?
    • Attingal revolt
    • Punnapara Vayalar revolt
    • Channar revolt
    • Perinad revolt

  86. Who is the Human Resource Development Minister of Union Cabinet?
    • Prakash Javadekar
    • Venkaiah Naidu
    • Smriti lrani
    • Suresh Prabhu

  87. How many organs are in a normal human body?
    • 76
    • 73
    • 79
    • 70

  88. Who is the captain of the Kerala team for the Santhosh Trophy Football Tournament 2017?
    • P. Usman
    • Vineeth
    • Shafiq
    • I.M. Vijayan

  89. Who is known as the Nightingale of India?
    • lndira Gandhi
    • Mother Theressa
    • Sarojini Naidu
    • Sister Nivithitha

  90. Which of the following project studied to ensure integrated development of Children up to 6 years?
    • ICDS
    • RMSA
    • SSA
    •  NSPS

  91. Who is known as Kerala Lincoln?
    • C. Kesevan
    • Pandit Karuppan
    • Ayyankali
    • Dr. Palppu

  92. Name the first person nominated from Kerala to Rajya Sabha
    • Sardar K.M. Panikkar
    • K.M. Chandy
    • M.M. Jacob
    • A.K. Antony

  93. Who is the author of ‘A Long Way’?
    • lndira Gandhi
    • Rajiv Gandhi
    • A.B. Vajpayee
    • P.V. Narasimha Rao

  94. Nagaland is also known as
    • Land of festival
    • Land of letters
    • Land of happiness
    • Land of cultural heritage

  95. Which Taluk in Kerala have longest sea coastal area?
    • Kollam
    • Cherthala
    • Kozhikode
    • Kannur

  96. Which place is known as ‘Gift of Pamba’?
    • Kuttanad
    • Mennachel
    • Erumali
    • Karuvata

  97. Name foreign country issue postal stamp for the sake of Sree Narayana Guru
    • Nepal
    • Sri Lanka
    • China
    • Myanmar

  98. Which Indian state have Common Civil Code?
    • Jammu and Kashmir
    • Mizoram
    • Goa
    • Nagaland

  99. Which place is famous for natural sandalwood forest in Kerala?
    • Chinnar
    • Mangala vanam
    • Wayanad
    • Marauyar

  100. In 1936 India start its first National Park in which state?
    • Uttarakhand
    • Nagaland
    • Himachal Pradesh
    • Mizoram

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5 comments

  1. 32.In a home TV, the lead from the antenna is

    Answer "a co-axial cable"
    Now a days co axial cable is used

    "a twin wire fat ribbon of 300 ohms" is used in old tv set unit. this cable is currently useless

    ReplyDelete
  2. 2) In MOD-10 counter, how many flip-flop are cascaded?

    Answer is 4

    ReplyDelete
    Replies
    1. How many marks did u get in dis exam?

      Delete
  3. can i get the expected cut off..

    ReplyDelete
  4. When Leigh Steinberg's Sporting Green Alliance collected old cell phones last year to recycle, the message was to recycle all the electronic gadgets and devices that we have accumulated. attuatori pneumatici

    ReplyDelete