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Junior Instructor - Electronic Mechanic question paper 2018

Industrial Training

Date of test
04/10/2018
Question paper code
49/2018/OL
Questions
100
Answer key
Provisional Answer Key
Exam mode
Online (computer based)

Provisional key. Kerala PSC can change answers after reviewing complaints; the final key decides the marks.

See questions with answersPractise as a mock test

Source: Kerala PSC (keralapsc.gov.in) · official document· Last updated 25 Sept 2026· How we check content

Official PDFs

As published by the Kerala Public Service Commission.

All 100 questions with answers

Tap an option to check yourself, or open the answer. Answers follow the official Kerala PSC answer key.

  1. 1.
    Who repealed the vernacular press act?
    Show answer and explanation
    Answer: B —
    Lord Ripon
    Lord Ripon repealed the Vernacular Press Act in 1882.
    Report a mistake
  2. 2.
    The pioneer of Indian Communism is
    Show answer and explanation
    Answer: D —
    M.N. Roy
    M.N. Roy was a prominent Indian revolutionary and the founder of the Communist Party of India in Tashkent.
    Report a mistake
  3. 3.
    'Kanya Van Samrudhi Yojana' is launched by
    Show answer and explanation
    Answer: A —
    Maharashtra
    Kanya Van Samrudhi Yojana is a scheme launched by the Government of Maharashtra.
    Report a mistake
  4. 4.
    The 'Woods Dispatch' of 1854 is associated with
    Show answer and explanation
    Answer: C —
    Establishment of Universities in India
    Wood's Dispatch of 1854 is often referred to as the Magna Carta of English education in India, leading to the establishment of universities.
    Report a mistake
  5. 5.
    The percentage of earth surface covered by India is
    Show answer and explanation
    Answer: B —
    2.4%
    India covers approximately 2.4% of the total geographical area of the world.
    Report a mistake
  6. 6.
    The first indigenously built atomic power station in India was
    Show answer and explanation
    Answer: C —
    Kalpakkam
    Madras Atomic Power Station (MAPS) at Kalpakkam was the first fully indigenously built nuclear power station in India.
    Report a mistake
  7. 7.
    The place where salt satyagraha took place in Kerala?
    Show answer and explanation
    Answer: B —
    Payyannur
    Payyannur was the main center of the Salt Satyagraha in Kerala.
    Report a mistake
  8. 8.
    23rd May 1931 is associated with
    Show answer and explanation
    Answer: C —
    Bhagat Singh
    This date is associated with the martyrdom of Bhagat Singh, Rajguru, and Sukhdev.
    Report a mistake
  9. 9.
    The 8th Five Year Plan in India was implemented between
    Show answer and explanation
    Answer: D —
    1992-97
    The 8th Five Year Plan was implemented from 1992 to 1997.
    Report a mistake
  10. 10.
    The forced labour without remuneration in pre-modern Kerala was known as
    Show answer and explanation
    Answer: D —
    Uzhiyam
    Uzhiyam was a system of forced labor without payment in pre-modern Kerala.
    Report a mistake
  11. 11.
    At which place, Vaikunda Swamikal attained enlightenment and assumed the title 'Vaikundar'?
    Show answer and explanation
    Answer: A —
    Tiruchendur
    Vaikunda Swamikal attained enlightenment at Tiruchendur.
    Report a mistake
  12. 12.
    In which year Sri. Brahmananda Sivayogi formed a new philosophy or religion called Anandadarsha?
    Show answer and explanation
    Answer: C —
    1892
    Brahmananda Sivayogi founded the Anandadarsha in 1892.
    Report a mistake
  13. 13.
    Which among the following works of Thycaud Ayya showed his scholarship as a Vedantist?
    Show answer and explanation
    Answer: B —
    Brahmotharakandam
    Brahmotharakandam is a work by Thycaud Ayya that reflects his Vedantic knowledge.
    Report a mistake
  14. 14.
    In the year 1922, Sri Narayana Guru built a temple at Murukkumpuzha and consecrated not an idol but a mere inscription. Which among the following words are not inscribed in it?
    Show answer and explanation
    Answer: D —
    Compassion
    The inscription contained Truth, Love, and Mercy.
    Report a mistake
  15. 15.
    The Cochin Legislative Council that came into existence in 1925 was inaugurated in ________
    Show answer and explanation
    Answer: A —
    Tripunithura
    The Cochin Legislative Council was inaugurated at Tripunithura.
    Report a mistake
  16. 16.
    Who has won the Men's Singles French Open Tennis tournament in 2018?
    Show answer and explanation
    Answer: A —
    Rafael Nadal
    Rafael Nadal won the 2018 French Open Men's Singles title.
    Report a mistake
  17. 17.
    The first fish on earth known to be truly warm blooded is _________
    Show answer and explanation
    Answer: D —
    Opah
    The Opah (Lampris guttatus) is the first fish discovered to be fully warm-blooded.
    Report a mistake
  18. 18.
    Which of the following was selected as the best motion picture and took home the Oscar 2018?
    Show answer and explanation
    Answer: B —
    Moonlight
    Moonlight won the Academy Award for Best Picture in 2017 (awarded in 2017, though the question context refers to the 2018 ceremony, the provided key indicates B).
    Report a mistake
  19. 19.
    The place where International Bhuddhist conference was held in 2018?
    Show answer and explanation
    Answer: A —
    Lumbini
    The International Buddhist Conference in 2018 was held in Lumbini, Nepal.
    Report a mistake
  20. 20.
    NASA's _________ discovered ancient components necessary for life on Mars.
    Show answer and explanation
    Answer: C —
    The Curiosity
    NASA's Curiosity rover discovered organic molecules in Martian rocks.
    Report a mistake
  21. 21.
    The software used for high performance numerical computation and visualization
    Show answer and explanation
    Answer: B —
    MATLAB
    MATLAB is a high-performance language for technical computing.
    Report a mistake
  22. 22.
    VHSIC Hardware Description Language is commonly called
    Show answer and explanation
    Answer: A —
    VHDL
    VHDL stands for VHSIC Hardware Description Language.
    Report a mistake
  23. 23.
    In D'Arsonval Movement the torque exerted on the pivoted coil is proportional to the applied
    Show answer and explanation
    Answer: B —
    Current
    Deflecting torque in a D'Arsonval movement is directly proportional to the current flowing through the coil.
    Report a mistake
  24. 24.
    LVDT is used to measure
    Show answer and explanation
    Answer: C —
    Displacement
    Linear Variable Differential Transformer (LVDT) is an electromechanical transducer used to measure linear displacement.
    Report a mistake
  25. 25.
    All pass filters are used for
    Show answer and explanation
    Answer: A —
    Phase correction
    All-pass filters pass all frequencies with equal gain while changing the phase relationship.
    Report a mistake
  26. 26.
    A network designed to attenuate certain frequencies and allow other to pass without attenuation is called
    Show answer and explanation
    Answer: A —
    Filter
    An electronic filter is a circuit that removes unwanted frequency components or passes specific frequencies.
    Report a mistake
  27. 27.
    The instrument used to display a signal in frequency domain is
    Show answer and explanation
    Answer: C —
    Spectrum Analyser
    A spectrum analyzer displays signal amplitude versus frequency (frequency domain).
    Report a mistake
  28. 28.
    IC 7447 is
    Show answer and explanation
    Answer: D —
    Decoder IC
    IC 7447 is a BCD to 7-segment decoder/driver IC.
    Report a mistake
  29. 29.
    The element used to separate transmitting and receiving signals in a single antenna system
    Show answer and explanation
    Answer: D —
    Duplexer
    A duplexer is an electronic device that allows bi-directional communication over a single channel.
    Report a mistake
  30. 30.
    Which one is not an internal part of PLC?
    Show answer and explanation
    Answer: D —
    DIMM
    DIMM (Dual In-line Memory Module) is typically associated with general computer RAM, not standard internal PLC core architecture.
    Report a mistake
  31. 31.
    In an SCR Holding current is
    Show answer and explanation
    Answer: B —
    Less than Latching current
    Holding current is the minimum anode current required to maintain the SCR in the ON state, and it is less than the latching current.
    Report a mistake
  32. 32.
    The synchronous speed of a synchronous motor is directly proportional to
    Show answer and explanation
    Answer: C —
    Frequency of input voltage
    Synchronous speed Ns=120fPN_s = \frac{120f}{P}, which is directly proportional to the supply frequency ff.
    Report a mistake
  33. 33.
    Bandwidth of an FM radio station
    Show answer and explanation
    Answer: C —
    200 KHz
    Standard commercial FM broadcast stations use a total channel bandwidth of 200 kHz.
    Report a mistake
  34. 34.
    Number of Flip Flips required to construct a MOD-12 counter
    Show answer and explanation
    Answer: C —
    4
    The number of flip-flops nn satisfies 2n≥MOD2^n \ge \text{MOD}. For MOD-12, 24=16≥122^4 = 16 \ge 12, hence 4 flip-flops are required.
    Report a mistake
  35. 35.
    The IC 8279 is
    Show answer and explanation
    Answer: D —
    Keyboard and Display Interface
    Intel 8279 is a programmable keyboard and display interface controller.
    Report a mistake
  36. 36.
    Which logic family has the lowest propagation delay?
    Show answer and explanation
    Answer: D —
    Schottky TTL
    Schottky TTL uses Schottky diodes to prevent transistor saturation, resulting in very low propagation delay.
    Report a mistake
  37. 37.
    Anti-fuse is related to
    Show answer and explanation
    Answer: C —
    ASIC
    An anti-fuse is an electrical device that acts as an open circuit until it is permanently programmed into a low-resistance state, commonly used in FPGAs and ASICs.
    Report a mistake
  38. 38.
    ____________ is not a microprocessor.
    Show answer and explanation
    Answer: D —
    8051
    8051 is a microcontroller, not a microprocessor.
    Report a mistake
  39. 39.
    What is the total power of an AM signal with 100 Watts carrier power and 100% depth of modulation?
    Show answer and explanation
    Answer: C —
    150 watts
    Total power Pt=Pc(1+m22)=100×(1+122)=150 WP_t = P_c (1 + \frac{m^2}{2}) = 100 \times (1 + \frac{1^2}{2}) = 150 \text{ W}.
    Report a mistake
  40. 40.
    Foster-Seeley demodulator is
    Show answer and explanation
    Answer: B —
    FM Demodulator
    The Foster-Seeley discriminator is a widely used frequency modulation (FM) demodulator circuit.
    Report a mistake
  41. 41.
    SCR in reverse blocking mode, the junctions are reverse biased are
    Show answer and explanation
    Answer: D —
    J1 and J3
    In reverse blocking mode of an SCR, junctions J1 and J3 are reverse biased, while J2 is forward biased.
    Report a mistake
  42. 42.
    Snubber circuits are used in SCR circuit for
    Show answer and explanation
    Answer: B —
    To protect from high dv/dt
    Snubber circuits protect thyristors from high rates of change of voltage (dv/dtdv/dt).
    Report a mistake
  43. 43.
    Which oscillator that can be fabricated in IC form?
    Show answer and explanation
    Answer: A —
    Relaxation Oscillator
    Relaxation oscillators (such as IC 555 astable multivibrators) are easily fabricated in IC form.
    Report a mistake
  44. 44.
    Base of a number system is also called
    Show answer and explanation
    Answer: B —
    Radix
    The base of a number system is also known as its radix.
    Report a mistake
  45. 45.
    Divide by error interrupt in 8086 can initiated using
    Show answer and explanation
    Answer: D —
    INT 0
    Division error (divide by zero) in the 8086 microprocessor generates a Type 0 interrupt, initiated via INT 0.
    Report a mistake
  46. 46.
    Using three numbers of resistances _____________ number of combinations can be made.
    Show answer and explanation
    Answer: B —
    4
    Three resistors can be combined in 4 different ways: all in series, all in parallel, two in parallel with one in series, and two in series with one in parallel.
    Report a mistake
  47. 47.
    The ideal output resistance of a voltage amplifier is ___________ resistance.
    Show answer and explanation
    Answer: D —
    Zero
    An ideal voltage amplifier has zero output resistance so that output voltage remains independent of the load.
    Report a mistake
  48. 48.
    CMRR is related to
    Show answer and explanation
    Answer: D —
    Op-Amp
    Common Mode Rejection Ratio (CMRR) is a key parameter of Operational Amplifiers (Op-Amps).
    Report a mistake
  49. 49.
    Capacity of a single layer Blu-Ray disc
    Show answer and explanation
    Answer: C —
    25 GB
    A standard single-layer Blu-ray disc has a storage capacity of 25 GB.
    Report a mistake
  50. 50.
    Nyquist sampling theorem is related to
    Show answer and explanation
    Answer: C —
    PCM
    Nyquist sampling theorem forms the theoretical foundation for Pulse Code Modulation (PCM).
    Report a mistake
  51. 51.
    The ideal data speed of 5 G mobile network
    Show answer and explanation
    Answer: A —
    20 GB/s
    The ITU IMT-2020 standard specifies peak data rates of 20 Gb/s for 5G networks.
    Report a mistake
  52. 52.
    The type of connector used in telephones
    Show answer and explanation
    Answer: B —
    RJ-11
    RJ-11 is the standard modular connector used for telephone sets.
    Report a mistake
  53. 53.
    Signals transmitted over several different paths is called
    Show answer and explanation
    Answer: C —
    Space diversity
    Space diversity (or path diversity) involves transmitting signals over multiple propagation paths.
    Report a mistake
  54. 54.
    The light detector used in optical fibre communication
    Show answer and explanation
    Answer: C —
    (1) and (2)
    Both PIN photodiodes and Avalanche Photodiodes (APD) are commonly used light detectors in fiber optic communications.
    Report a mistake
  55. 55.
    Class C amplifiers are commonly used as ____________ Amplifiers.
    Show answer and explanation
    Answer: C —
    Radio frequency
    Class C amplifiers have conduction angle less than 180 degrees and are widely used in RF tuned circuits.
    Report a mistake
  56. 56.
    The number of select lines in a 1 to 8 de-multiplexer is
    Show answer and explanation
    Answer: B —
    3
    For a 1-to-8 de-multiplexer, 2n=82^n = 8, so the number of select lines n=3n = 3.
    Report a mistake
  57. 57.
    Number of address lines required to address a memory system made of 2 modules of 1 MB memory chips
    Show answer and explanation
    Answer: C —
    21
    Total memory size = 2×1 MB=2 MB=2212 \times 1 \text{ MB} = 2 \text{ MB} = 2^{21} bytes, requiring 21 address lines.
    Report a mistake
  58. 58.
    A Karnaugh Map is an abstract form of ___________ diagram.
    Show answer and explanation
    Answer: D —
    Venn diagram
    A Karnaugh map is an equivalent graphical representation of a truth table structured like a Venn diagram.
    Report a mistake
  59. 59.
    A logic circuit that has memory is
    Show answer and explanation
    Answer: A —
    Sequential circuit
    Sequential circuits contain memory elements (flip-flops) so output depends on current inputs and past states.
    Report a mistake
  60. 60.
    The basic block in an HDL program is called
    Show answer and explanation
    Answer: C —
    Module
    In hardware description languages like Verilog and VHDL, the fundamental building block is the module.
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  61. 61.
    Number of bits in a Binary Coded Decimal Number
    Show answer and explanation
    Answer: B —
    4
    BCD represents each decimal digit using a 4-bit binary code.
    Report a mistake
  62. 62.
    All Keywords in c programming is
    Show answer and explanation
    Answer: A —
    Lower case
    All C keywords must be written in lowercase letters.
    Report a mistake
  63. 63.
    In the specifications of a network interface card 10/100 stands for
    Show answer and explanation
    Answer: B —
    Mega bits per second
    10/100 indicates support for data transfer speeds of 10 Mbps and 100 Mbps.
    Report a mistake
  64. 64.
    Ripple factor of Halfwave rectifier is
    Show answer and explanation
    Answer: A —
    1.21
    The ripple factor for a half-wave rectifier is approximately 1.21.
    Report a mistake
  65. 65.
    Major application of a Varactor diode is
    Show answer and explanation
    Answer: D —
    Tuning circuit
    A varactor diode operates as a voltage-controlled capacitor, widely used in resonant tuning circuits.
    Report a mistake
  66. 66.
    Cut-in voltage of a Germanium diode is
    Show answer and explanation
    Answer: A —
    0.2 V
    The typical cut-in (barrier potential) voltage for a Germanium diode is around 0.2 V.
    Report a mistake
  67. 67.
    Which of the following has highest internal resistance?
    Show answer and explanation
    Answer: A —
    A constant current source
    An ideal constant current source has infinite internal resistance, whereas an ideal voltage source has zero internal resistance.
    Report a mistake
  68. 68.
    A DC current source has a short circuit current of 4 mA and an open-circuit voltage of 20 V. The internal resistance is
    Show answer and explanation
    Answer: A —
    5 KΩ
    Internal resistance Rth=VocIsc=20 V4 mA=5 kΩR_{th} = \frac{V_{oc}}{I_{sc}} = \frac{20 \text{ V}}{4 \text{ mA}} = 5 \text{ k}\Omega.
    Report a mistake
  69. 69.
    The overall gain of RC coupled amplifier is small due to
    Show answer and explanation
    Answer: B —
    Loading effect of successive stages
    The overall gain decreases due to the loading effect of successive amplifier stages.
    Report a mistake
  70. 70.
    Intrinsic standoff ratio is the characteristics of
    Show answer and explanation
    Answer: D —
    UJT
    Intrinsic standoff ratio (η\eta) is a defining characteristic parameter of a Uni-Junction Transistor (UJT).
    Report a mistake
  71. 71.
    Stability of a circuit increases with
    Show answer and explanation
    Answer: B —
    Negative feedback
    Negative feedback improves gain stability, reduces distortion, and widens bandwidth.
    Report a mistake
  72. 72.
    An emitter follower is
    Show answer and explanation
    Answer: A —
    Current series feedback circuit
    An emitter follower (common collector amplifier) employs current-series (voltage-sampled, current-summed) negative feedback.
    Report a mistake
  73. 73.
    The output frequency of a crystal oscillator is stable because of
    Show answer and explanation
    Answer: A —
    High Q of the crystal
    Piezoelectric quartz crystals possess an extremely high quality factor (Q), ensuring high frequency stability.
    Report a mistake
  74. 74.
    An Ideal Op-Amp has
    Show answer and explanation
    Answer: D —
    All of these
    An ideal operational amplifier has infinite voltage gain, infinite input impedance, and zero output resistance.
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  75. 75.
    An example for wave shaping circuit is
    Show answer and explanation
    Answer: C —
    Schmitt Trigger
    A Schmitt trigger is a comparator-based wave-shaping circuit that converts irregular waveforms into square/rectangular pulses.
    Report a mistake
  76. 76.
    Number of diodes in a bridge rectifier is
    Show answer and explanation
    Answer: B —
    4
    A full-wave bridge rectifier circuit uses 4 diodes.
    Report a mistake
  77. 77.
    Bucking voltage is another name for
    Show answer and explanation
    Answer: A —
    Back emf
    Back EMF in motors opposes the applied voltage and is also referred to as bucking voltage.
    Report a mistake
  78. 78.
    The gain of amplifier in RC phase shift oscillator should be
    Show answer and explanation
    Answer: D —
    29
    To sustain oscillations in an RC phase-shift oscillator, the internal amplifier gain must be at least 29.
    Report a mistake
  79. 79.
    In a PTC thermistor, the temperature at which resistance increases rapidly is known as
    Show answer and explanation
    Answer: B —
    Switching point
    The switching temperature (Curie point) of a PTC thermistor is where its resistance sharply increases.
    Report a mistake
  80. 80.
    Forbidden energy gap of Germanium is
    Show answer and explanation
    Answer: A —
    0.72 eV
    The band gap energy of Germanium at room temperature is approximately 0.72 eV.
    Report a mistake
  81. 81.
    Esaki diode is another name for
    Show answer and explanation
    Answer: C —
    Tunnel Diode
    Tunnel diode was invented by Leo Esaki and is commonly called the Esaki diode.
    Report a mistake
  82. 82.
    In a signed binary number, the sign used to indicate a negative number is
    Show answer and explanation
    Answer: B —
    1
    In signed binary representation, the most significant bit (MSB) 1 represents a negative number.
    Report a mistake
  83. 83.
    Which one is a serial to parallel converter?
    Show answer and explanation
    Answer: C —
    De-Multiplexer
    A de-multiplexer routes a single serial input data line to multiple parallel output lines.
    Report a mistake
  84. 84.
    Number of modes of operations in TRIAC
    Show answer and explanation
    Answer: A —
    4
    A TRIAC can operate in 4 distinct quadrants based on terminal voltages and gate trigger polarities.
    Report a mistake
  85. 85.
    Which one is not a networking component?
    Show answer and explanation
    Answer: A —
    RS 232
    RS-232 is a physical serial communication standard, not a network device.
    Report a mistake
  86. 86.
    How many bytes of bits addressable locations are present in 8051 microcontroller?
    Show answer and explanation
    Answer: B —
    16
    The 8051 internal RAM has 16 bytes of bit-addressable locations (addresses 20H to 2FH, totaling 128 bits).
    Report a mistake
  87. 87.
    Instruction queue size in 8086 is ___________ bytes.
    Show answer and explanation
    Answer: A —
    6
    The 8086 microprocessor features a 6-byte instruction prefetch queue.
    Report a mistake
  88. 88.
    Number of transistors integrated in 8086 microprocessor
    Show answer and explanation
    Answer: B —
    29000
    The 8086 microprocessor contains approximately 29,000 transistors.
    Report a mistake
  89. 89.
    Inelastic scattering of photon is defined by
    Show answer and explanation
    Answer: D —
    Raman effect
    Raman scattering describes the inelastic scattering of photons by matter.
    Report a mistake
  90. 90.
    Rise time budget is related to
    Show answer and explanation
    Answer: C —
    Optical link
    Rise time budget analysis is used in optical fiber communication system design to ensure adequate bandwidth.
    Report a mistake
  91. 91.
    Johnson-Nyquist noise is another name for ___________ noise.
    Show answer and explanation
    Answer: D —
    Thermal noise
    Thermal noise generated by thermal agitation of charge carriers is also called Johnson-Nyquist noise.
    Report a mistake
  92. 92.
    According to _____________, a spatially varying electric field is always associated with a magnetic field that changes over time.
    Show answer and explanation
    Answer: D —
    Maxwells equations
    Maxwell's equations unify electricity and magnetism, establishing that time-varying magnetic fields create electric fields and vice-versa.
    Report a mistake
  93. 93.
    A hollow conductive metal pipe used for communication is called
    Show answer and explanation
    Answer: B —
    Wave Guide
    A waveguide is a hollow metallic pipe used to transport high-frequency radio waves, particularly microwaves.
    Report a mistake
  94. 94.
    Which one is not an embedded operation system?
    Show answer and explanation
    Answer: D —
    Solaris
    Solaris is a Unix-based server/desktop operating system, whereas Android, WebOS, and iOS are used in embedded/mobile devices.
    Report a mistake
  95. 95.
    The first Personal Computer (PC) was introduced by
    Show answer and explanation
    Answer: A —
    IBM
    IBM introduced the IBM Personal Computer (Model 5150) in 1981, popularizing the term PC.
    Report a mistake
  96. 96.
    IEEE 802.11 is the standard used for
    Show answer and explanation
    Answer: D —
    WLAN
    IEEE 802.11 specifies the set of standards for implementing wireless local area network (WLAN) computer communication.
    Report a mistake
  97. 97.
    The point of intersection of DC and AC load lines is called
    Show answer and explanation
    Answer: C —
    Operating point
    The quiescent operating point (Q-point) lies at the intersection of the DC and AC load lines.
    Report a mistake
  98. 98.
    A zener diode that has very narrow depletion layer will breakdown by ___________ mechanism.
    Show answer and explanation
    Answer: A —
    Zener breakdown
    Zener diodes with very high doping have narrow depletion regions, causing breakdown via quantum tunneling (Zener effect).
    Report a mistake
  99. 99.
    In a multivibrator, we have _____________ feedback.
    Show answer and explanation
    Answer: C —
    100% positive feedback
    Multivibrators use regenerative (positive) feedback with a loop gain greater than unity to achieve two distinct states.
    Report a mistake
  100. 100.
    For display of signal pattern ____________ voltage is applied to the horizontal plates of a CRO.
    Show answer and explanation
    Answer: B —
    Saw tooth
    A saw-tooth time-base voltage is applied to the horizontal deflection plates of a cathode ray oscilloscope.
    Report a mistake

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