Junior Instructor Electronic Mechanic 547/2017 Answer Key 79/2018

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Post: Junior Instructor (Electronic Mechanic)
Department: Industrial Training
Category Code: 547/17
Qualification: S.S.L.C + Diploma in the appropriate branch of Engineering / National Trade Certificate
Question Paper Code: 79/18
Date of Test: 20-07-2018


If you find mistakes, comment below



  1. A resistor with colour coded value of 1000 ohms and ± 20% tolerance can have an actual resistance between
    • 980 Ohm and 1020 Ohm
    • 800 Ohm and 1000 Ohm
    • 1000 Ohm and 1200 Ohm
    • 800 Ohm and 1200 Ohm

  2. For a carbon-composition resistor colour coded with Yellow, Violet, Orange and Silver stripes left to right, the resistance and tolerance are
    • 470 Ohms ± 5%
    • 47 Kilo Ohm ± 10%
    • 47 Mega Ohms ± 5%
    • 4700 Ohms ± 10%

  3. Five Capacitors each of 5 µF are connected in parallel, the equivalent capacitance will be
    • 25 µF
    • 15 µF
    • 1 µF
    • 10 µF

  4. The resistance of a conductor of diameter D and length L is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
    • R Ω
    • 2R Ω
    • 4R Ω
    • 8R Ω

  5. The electrical energy consumed by a coil is stored in the form of :
    • An electrical field
    • A force field
    • An electrostatic field
    • A magnetic field

  6. In a purely inductive circuit
    • Current leads voltage by 90°
    • Voltage lags current by 90°
    • Voltage leads current by 90°
    • Voltage and Current are in Phase (0°)

  7. A semiconductor has ______ Valence Electrons.
    • 5
    • 6
    • 4
    • 3

  8. The strength of a semiconductor crystal comes from ______.
    • Forces between Protons
    • Forces between Nuclei
    • Electron-Pair Bonds
    • None of these

  9. If Doping level of a crystal diode is increased, the breakdown voltage ______.
    • is increased
    • is decreased
    • remains the same
    • None of these

  10. A Zener diode has ______.
    • One PN Junction
    • Two PN Junction
    • Three PN Junction
    • Four PN Junction

  11. Fermi level for extrinsic semiconductor depends on
    • Donor Element
    • Impurity Concentration
    • Temperature
    • All of these

  12. What is the maximum power rating for light emitting diodes?
    • 150 mW
    • 300 mW
    • 500 mW
    • 5 mW

  13. A Transistor is a ______ operated device.
    • Voltage
    • Current
    • Both Voltage and Current
    • None of these

  14. The Operation of JFET involves
    • Flow of minority Carriers
    • Flow of majority Carriers
    • Recombination
    • None of these

  15. When transistors are used in digital circuits they usually operate in the :
    • Active Region
    • Saturation and Cutoff Regions
    • Breakdown Region
    • Linear Region

  16. If a 2 mV signal produces a 2V output, what is the Voltage Gain?
    • 0.001
    • 100
    • 1000
    • 0.004

  17. Least Distortion in the Output of a Power amplifier occurs in
    • Class A
    • Class B
    • Class AB
    • Class C

  18. In a Class C Amplifier
    • Efficiency and distortion both are maximum.
    • Efficiency and distortion both are minimum.
    • Efficiency maximum but distortion minimum.
    • Efficiency minimum but distortion maximum.

  19. The Cut in Voltage of a Germanium junction diode is
    • 0.1V
    • 0.3V
    • 0.7V
    • 1V

  20. Which among the following does not belong to the category of LC oscillator?
    • Hartley oscillator
    • Colpitts oscillator
    • Wein bridge oscillator
    • Clapp oscillator

  21. Why is the practical value of | Ab | considered to be slightly greater than one in oscillators?
    • To compensate for non-linearities existing in the circuit.
    • To compensate for phase shifting of two relevant signals upto 180°.
    • To compensate for the change in feedback voltage.
    • To compensate for noise voltage.

  22. The RC network of a Wien Bridge Oscillator consists of R1=R2=10 KΩ and C1=C2=1000nF. The frequency of oscillation is :
    • 15.9 Hz
    • 159.12 Hz
    • 180 Hz
    • 15915 Hz

  23. Which of the following oscillator will give most stable output oscillation frequency?
    • Colpitts oscillator
    • Hartley oscillator
    • Crystal oscillator
    • RC phase shift oscillator

  24. Which Number System has a base of 16?
    • Hexadecimal
    • Octal
    • Decimal
    • Binary

  25. Which of these sets of Logic Gates are designated as Universal Gates?
    • NOR, NAND, XNOR
    • NOR, NAND, AND
    • OR, NOT, AND
    • NOR, NAND

  26. In a 1 to 4 De multiplexer, how many select inputs lines are required?
    • 2
    • 3
    • 4
    • 5

  27. The Decimal equivalent of (110011.110)2 is
    • 25.375
    • 25.175
    • 25.250
    • 25.750
    Question Error

  28. The Gray code representation of 15 is
    • 1001
    • 1000
    • 1100
    • None of these

  29. Which of the following expressions is in the Sum-Of-Products (SOP) form?
    • (A + B)(C + D)
    • B(CD)
    • AB + CD
    • All

  30. The Terminal count of a modulus-10 binary counter is
    • 1010
    • 1001
    • 1000
    • 1011

  31. A simple Flip-Flop is
    • 1 Bit Memory
    • 2 Bit Memory
    • 3 Bit Memory
    • None of these

  32. Which of the following is not a weighted code?
    • BCD
    • EXCESS-3 CODE
    • 8421
    • 6421

  33. A Karnaugh map (K-map) with 4 Variables has ________ cells.
    • 2
    • 8
    • 16
    • 32

  34. A counter is a :
    • Sequential Circuit
    • Combinational Circuit
    • Both Combinational and Sequential Circuit
    • None of these

  35. Which one of the following Logic Family IC is fastest?
    • TTL
    • ECL
    • DTL
    • CMOS

  36. In D flip-flop, ____ after the propagation delay.
    • Input Follows Input
    • Output Follows Output
    • Output Follows Input
    • Input Follows Output

  37. The Op-Amp can Amplify
    • A.C. Signals only
    • D.C. Signals only
    • Both A.C. and D.C. Signals
    • Neither D.C. nor A.C. Signals

  38. The Ideal Op-Amp has the following characteristics :
    • RI=∞, A=∞,R0=0
    • RI=0, A=∞, R0=0
    • RI=∞, A=∞, R0=∞
    • RI=0, A=∞, R0=∞

  39. Differential Amplifiers are used in
    • Buffers
    • Voltage Followers
    • Voltage Regulators
    • Instrumentation Amplifiers

  40. What would be a typical value for the unity-gain bandwidth of a 741 Operational Amplifier?
    • 103
    • 104
    • 105
    • 106

  41. The Open-Loop Gain of an Op-Amp is 105. An Input Signal of 1mV is applied to the Inverting input with the Non-Inverting connected to the ground. The Supply Voltage is ± 10V. The Output of the Amplifier will be close to :
    • + 100V
    • – 100V
    • + 10V
    • – 10V

  42. Which of the following is Hardware Interrupts?
    • RST5.5, RST6.5, RST7.5
    • INTR
    • TRAP
    • All of these

  43. Which Stack is used in 8085?
    • FIFO
    • LIFO
    • FILO
    • None of these

  44. What is mean by ALU?
    • Arithmetic Logic Upgrade
    • Arithmetic Logic Unsigned
    • Arithmetic Logic Signed
    • Arithmetic Logic Unit

  45. The 8051 Microcontroller is of ______ Pin Package and a ______ Processor.
    • 30, 1 byte
    • 20, 1 Byte
    • 40, 8 Bit
    • 40, 8 Byte

  46. What is the function of the Watchdog Timer?
    • The Watchdog Timer is an external timer that resets the system if the software fails to operate properly.
    • The Watchdog Timer is an internal timer that sets the system if the software fails to operate properly.
    • The Watchdog Timer is an internal timer that resets the system if the software fails to operate properly.
    • None of these

  47. Which of the following instruction perform as of indirect RAM to Accumulator?
    • MOV A, Rn
    • MOV Rn, A
    • MOV @R1, A
    • MOV A, @R1

  48. When the 8051 is reset and the EA line is low, the program counter points to the first program instruction in the :
    • Internal Code Memory
    • Internal Data Memory
    • External Code Memory
    • External Data Memory

  49. An alternate function of port pin p3.0 (Rxd) in the 8051 is :
    • Serial Port Input
    • Serial Port Output
    • Memory Write Strobe
    • Memory Read Strobe

  50. Clamper is also known as
    • Charger
    • Clipper
    • Rectifier
    • DC Restorer

  51. Vestigial Type Modulation gives :
    • High SNR
    • Low Bandwidth
    • Wide Bandwidth
    • FM

  52. Receiving Antenna for TV is normally
    • Loop Antenna
    • Parabolic Reflector
    • Yagi Antenna
    • Folded Dipole

  53. Pre-emphasis is used to
    • Increase RF Power
    • Convert FM into PM
    • Improve SNR
    • Correct AM into AM VSB

  54. Sensitivity of Microphone is determined by measuring the ______
    • Output voltage at a given sound pressure
    • Output current at a given sound pressure
    • Output voltage and current at a given sound pressure
    • None of these

  55. Basic Principles of producing moving pictures is based on :
    • Continuity
    • Illusion of Continuity
    • Both 'Continuity' and 'Illusion of Continuity'
    • None of these

  56. Principle of VIDICON camera tube is based on
    • Photo Emission Effect
    • Photo Conduction Effect
    • Field Effect
    • Photo Voltaic Effect

  57. A PIN Diode is frequently used as a
    • Peak Clipper
    • Harmonic Generator
    • Voltage Regulator
    • Switching Diode for frequencies up to GHZ range

  58. For proper working of a clamper, time constant of the circuit should be
    • Large
    • Small
    • Equal To Signal Time Period
    • Greater Than 5 Times Signal Time Period

  59. A UJT has Rbb=10 KΩ and Rb2 = 4 KΩ. Its intrinsic standoff ratio is
    • 0.6
    • 0.4
    • 2.5
    • 5/3

  60. The main purpose of modulation is to
    • Combine two waves of different frequencies
    • Achieve wave shaping of the carrier wave
    • Transmitting low frequency information over long distance efficiently
    • Produce side bands

  61. In AM, the power content of the carrier is maximum when m equals to
    • 0
    • l
    • 0.8
    • 0.5

  62. In the context of IC fabrication, metallisation means
    • Connecting metallic wires
    • Forming interconnecting conducting patterns
    • Covering with a metallic cap
    • All of these

  63. Commonly used ICs are ___________.
    • Thin Film
    • Monolithic
    • Hybrid
    • None of these

  64. An Audio Amplifier IC is an example of
    • Digital IC
    • Linear IC
    • Both Digital IC and Linear IC
    • None of these

  65. LM317 Voltage Regulator, what is the minimum value of voltage required between its input and output in order to supply power to an internal circuit?
    • 1V
    • 3V
    • 5V
    • 10V

  66. What is PSRR Value of an Ideal Op-Amp?
    • 0
    • Unity
    • Infinite
    • Unpredictable

  67. In PLL, the capture range is always _______the lock range.
    • Greater than
    • Less than
    • Equal to
    • None of these

  68. What is the nature of Radiation Pattern of an Isotropic Antenna?
    • Dough-Nut
    • Elliptical
    • Hyperbolic
    • Spherical

  69. Which among the following is not a disadvantage of Rhombic Antenna?
    • Requirement of large space
    • Reduced transmission efficiency
    • Wastage of power in terminating resistor
    • Maximum radiated power along main axis

  70. If an Antenna draws 12A current and radiates 4KW, then what will be its Radiation Resistance?
    • 22.22 Ω
    • 27.77 Ω
    • 33.33 Ω
    • 39.77 Ω

  71. The general arrangement of PLA is
    • AND/OR structure
    • OR/AND structure
    • NAND/NOR structure
    • EX-OR/OR structure

  72. Serial access memory at the chip level is classed as memory that has
    • Shift Registers
    • Counters
    • Access time is independent of location of data
    • Internally stored data is used

  73. The FPGA refers to
    • First Programmable Gate Array
    • First Program Gate Array
    • Field Program Guard Array
    • Field Programmable Gate Array

  74. The Full Form of VLSI is
    • Very Large Scale Integration
    • Very Least Scale Integration
    • Very Long Single Integration
    • None of these

  75. VHDL is being used for
    • Documentation
    • Verification
    • Synthesis of Large Digital Design
    • None of these

  76. Which of the following has the capability to store the information permanently?
    • RAM
    • ROM
    • Both RAM and ROM
    • None of these

  77. In a Computer, Registers are present
    • Within Control Unit
    • Within RAM
    • Within ROM
    • Within CPU

  78. The capacity of a memory unit is
    • The number of binary input stored
    • The number of words stored
    • The number of bytes stored
    • None of these

  79. Speed of Data Transmission in 4-G Network of Telecom is
    • 386 Kbps - 2 Mbps
    • 2 Mbps
    • 100 Mbps - 1 Gbps
    • 2 Mbps - 1 Gbps

  80. The sequence of operations in which Pulse Code Modulation is
    • Sampling, quantizing, encoding
    • Sampling, encoding quantizing,
    • Quantizing, sampling, encoding
    • None of these

  81. What was the name of the horse of Shivaji?
    • Chetak
    • Kanthaka
    • Pancha Kalyani
    • Bousephallus

  82. Which animal is known as “Living Fossil”?
    • Beaver
    • Legur
    • Tiger
    • Panda
    Question Error

  83. Which of the following day observed as “World Asthma Day” in 2017?
    • June 23
    • May 2
    • December 18
    • October 13

  84. Which blood group is without Antigen?
    • B
    • A
    • O
    • AB

  85. The study of flags is known as
    • Terttology
    • Rynology
    • Polmology
    • Vexillology

  86. Which year Malayali Memorial submitted?
    • 1891
    • 1896
    • 1897
    • 1900

  87. Who was famous for woman activities of Kerala Mahila Desa Sevika Sangh?
    • Lalitha Prabhu
    • Arya Pallam
    • A.V. Kuttimalu Amma
    • Anna Chandi

  88. The World Alzheimer’s day is observed on
    • October 21
    • August 29
    • September 21
    • September 14

  89. Savithrikutty Adava Vidava Vivaham is a
    • poem
    • novel
    • drama
    • critic

  90. Who founded Satya Shodhak Samaj?
    • Bhasker Rao Jadav
    • Gopal Deshmukh
    • Dayanand Saraswati
    • Jyotiba Phule

  91. Who is known as “Grand Old man of India”?
    • Bankim Chandra Chatterji
    • Dadabhai Naoroji
    • Ram Mohan Roy
    • Madan Mohan Malaviya

  92. “It was a post dated cheque on a crashing bank” – the statement related to
    • Communal Award
    • Wavell Plan
    • Cripp’s Mission
    • Cabinet Mission Plan

  93. The Viceroy who forward the proposal of August Offer in 1940 was
    • Lord Wellington
    • Lord Linlithgow
    • Lord Dufferin
    • Lord Mayo

  94. Who was the founder of Khudai Khitmatgar Organisation?
    • Shaukat Ali Ansari
    • Khan Abdul Qayyum Khan
    • Muhammed Ali Jinnah
    • Khan Abdul Gaffar Khan

  95. The first secretary of S.N.D.P. Yogam :
    • Kumaran Asan
    • Dr. Palpu
    • Sree Narayana Guru
    • Vellappilly Nadesan

  96. The Perinad ryot happened in
    • 1911
    • 1915
    • 1913
    • 1904

  97. Baba Amte related to
    • Narmada Bachao Andolan
    • Chipko Movement
    • Bishnoi Movement
    • Garhwal Himalayas

  98. Who wrote the book “Silent Spring”?
    • Robert Redford
    • Ralph Nader
    • Sunderlal Bahuguna
    • Rachel Carson

  99. What is the name of the Atom bomb laid in Nagasaki on August 9th 1945?
    • Litty boy
    • Fatty man
    • Little boy
    • Fat man

  100. Which day is observed as Zero Emissions Day?
    • 21st September
    • 8th June
    • 12th November
    • 11th July

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3 comments

  1. q-99. answer may be fatman, not fatty man
    q-41 please check is it -100?

    ReplyDelete
  2. expected cut off

    ReplyDelete