Name of Post: Technician Grade II (Electronics)
Department: Kerala Co-operative Milk Marketing Federation Ltd
Cat. No: 075/2021
Date of Test: 24.03.2022
Question Code: 010/2022
1. What is the shape of warning sign board?
(A) Hexagonal
(B) Square
(C) Circular
(D) Triangular
2. The classification of fire which involves metals are called :
(A) Class B
(B) Class A
(C) Class D
(D) Class C
3. Blanketing the fire with foam, sand etc. for stopping the supply of oxygen is called :
(A) Cooling
(B) Smothering
(C) Blanketing
(D) Starving the fire
4. The factors required of combustion are :
(A) Fuel and heat
(B) Heat and oxygen
(C) Fuel and oxygen
(D) Fuel, heat and oxygen
5. Which of the following is used to form curves /loops in wires?
(A) Side cutting pliers
(B) End cutting pliers
(C) Round nose pliers
(D) Flat nose pliers
6. Which of the following tool is used to hold light weight and very small components and very thin wires/strands?
(A) Diagonal plier
(B) Tweezers
(C) Scriber
(D) Try square
7. The material which have 4 valence electrons are called :
(A) Non-metal
(B) Semi conductor
(C) Metal
(D) None of the above
8. Insulators are also called?
(A) Thyristors
(B) Semi conductors
(C) Molecules
(D) Dielectrics
9. If the frequency of a sine wave is increased, then its wavelength will :
(A) Unchanged
(B) Increase
(C) Decrease
(D) None of the above
10. An AC voltmeter will display :
(A) RMS voltage
(B) Average voltage
(C) Peak voltage
(D) Peak-to Peak voltage
11. Which is the name of the motion of charged particles in any medium?
(A) Frequency
(B) Voltage
(C) Resistance
(D) Current
12. The electrical property opposes the flow of electrons is called :
(A) Power
(B) Voltage
(C) Resistance
(D) Current
13. Single strand wires are also known as :
(A) Hook-Up wire
(B) Multi strand wire
(C) Flexible wire
(D) Twisted wire
14. The purpose of SWG is :
(A) Measure current
(B) Measure voltage
(C) Measure diameter of wire
(D) Measure insulation of wire
15. A multimeter is used to measure :
(A) Resistance
(B) Current
(C) Voltage
(D) All of the above
16. An ammeter is connected in ———————- with a circuit to measure current :
(A) Series
(B) Parallel
(C) Series or parallel
(D) None of the above
17. The correction of mechanical zero error of panel meter is done :
(A) By replacing moving coil
(B) By replacing pointer
(C) Keeping the meter in vertical position
(D) By adjusting the screw
18. A galvanometer can be converted into voltmeter by connecting a ——————— with it :
(A) High resistance in series
(B) Low resistance in parallel
(C) Battery in series
(D) Variable resistance in series
19. Generally batteries can be mainly classified into two categories, namely
(A) Cylindrical cells and rectangular cells
(B) Primary cells and secondary cells
(C) Dry cells and alkaline cells
(D) Button cells and lithium cells
20. The electrolyte used in lead acid cell is :
(A) Alkaline solution
(B) Sulphuric acid
(C) Zinc chloride
(D) Hydrochloric acid
21. The nominal voltage of a single cell in lead acid battery :
(A) 2.2 V
(B) 1.1V
(C) 2.0 V
(D) 1.5 V
22. Usually ——————— is used to express the capacity of a battery :
(A) Ampere Hour
(B) KWH
(C) Volt
(D) None of the above
23. What is the colour code of 1000 ohm resistor?
(A) Black, Brown, Black
(B) Brown, Brown, Brown
(C) Brown, Black, Brown
(D) Brown, Black, Red
24. The amount of current flowing through a series connection or resistors :
(A) Similar
(B) Changes based on resistance value
(C) Different
(D) Stable
25. When the current flowing through a 10K resistor is 5mA. The power is :
(A) 250 mW
(B) 200 mW
(C) 100 mW
(D) None of the above
26. Unit of mutual inductance is :
(A) Henry
(B) Ohm
(C) Ampere
(D) Volts
27. The component which opposes any change in current is :
(A) Inductor
(B) Capacitor
(C) Resistor
(D) Diode
28 . _________ is a polarised capacitor.
(A) Plastic film capacitor
(B) Paper capacitor
(C) Ceramic capacitor
(D) Tantalum electrolytic capacitor
29. How electrical energy is stored in a capacitor?
(A) As magnetic field
(B) As electrostatic field
(C) As chemical form
(D) All the above
30. The ability of material to retain its magnetism is called :
(A) Retentivity
(B) Residual magnetism
(C) Resistivity
(D) None of the above
31. The capacitive reactance is ______________ when the frequency is increased :
(A) Infinity
(B) Decreased
(C) Increased
(D) Same
32. The winding of a transformer to which electrical energy is applied is known as :
(A) Main winding
(B) Auxillary winding
(C) Primary winding
(D) Secondary winding
33. Which impurity is added to pure semiconductor to form N-type material?
(A) Boron
(B) Indium
(C) Arsenic
(D) Gallium
34. What is the output pulse frequency of the full wave rectifier with input frequency of 50 Hz?
(A) 40 Hz
(B) 60Hz
(C) 100 Hz
(D) 200 Hz
35. What is the name of the process of converting AC into DC voltage?
(A) Inverting
(B) Rectifying
(C) Amplifying
(D) Demodulating
36. Forbidden energy gap at 0°K for Si and Ge respectively are :
(A) 0.5 eV and 0.7 eV
(B) l eV and 0.6 eV
(C) 1.21 eV and 0.785 eV
(D) 0.72 eV and 0.785 eV
37. Which of the following will serve as a donor impurity in silicon?
(A) Boron
(B) Indium
(C) Germanium
(D) Antimony
38. The temperature coefficient of an intrinsic semiconductor is :
(A) Negative
(B) Positive
(C) Like that of Metals
(D) Zero
39. Current flow in a semiconductor depends on the phenomenon of :
(A) Drift
(B) Diffusion
(C) Recombination
(D) All of the Above
40. Rectification efficiency of a full wave bridge rectifier will be :
(A) 40.6%
(B) 81.2%
(C) 95.8%
(D) 60.8%
41. What is the meaning of first letter indicated in the transistor code number BC 107?
(A) Germanium material used
(B) Antimony material used
(C) Silicon material used
(D) Indium material used
42. When a reverse bias is applied to PN junction the width of the depletion layer?
(A) Remains Same
(B) Is Increased
(C) Is Decreased
(D) May Increase or Decrease
43. Which of the following diode operated in reverse bias mode?
(A) P_N junction
(B) Schottky
(C) Tunnel
(D) Zener
44. Which configuration of transistor amplifier is most commonly used in electronic circuits?
(A) Common base configuration
(B) Common emitter configuration
(C) Common collector configuration
(D) Common drain amplifier configuration
45. How the negative feedback is called?
(A) Degenerative feedback
(B) Regenerative feedback
(C) Current controlled feedback
(D) Voltage controlled feedback
46. What type of packaging is generally used to transistors utilized for low power amplification?
(A) Metal packaging
(B) Plastic packaging
(C) Ceramic packaging
(D) Plastic packaging with metal heat sinks
47. Which class of amplifier will give less distortion for input signals?
(A) Class—A
(B) Class—B
(C) Class—AB
(D) Class—C
48. What is the function of pin number 4 of the IC 555?
(A) Set
(B) Reset
(C) Control voltage
(D) Threshold
49. The medium doped region in a transistor is :
(A) Collector
(B) Base
(C) Emitter
(D) Gate
50. A common collector amplifier has the highest :
(A) Voltage Gain
(B) Output Impedance
(C) Power Gain
(D) Current Gain
51. The lowest input resistance is obtained in which transistor configuration :
(A) Common Collector
(B) Common source
(C) Common Base
(D) Common Emitter
52. Transistor is a :
(A) current controlled voltage device
(B) current controlled current device
(C) voltage controlled voltage device
D) voltage controlled current device
53. A relaxation oscillator is one which :
(A) produces sinusoidal output
(B) no signal output
(C) relaxes indefinitely
(D) produce non sinusoidal output
54. Ideal value of Common Mode Rejection Ratio in OP-Amp is :
(A) unity
(B) zero
(C) infinity
(D) 0.50
55. What is the closed loop voltage gain of a inverting OP-amp circuit when feedback resistor
value is 10KΩ and input resistor value is 1KΩ?
(A) 10
(B) -10
(C) 1
(D) 11A
56. Which Multivibrator can be used for storing digital data?
(A) Astable Multivibrator
(B) Mono Stable Multivibrator
(C) Bistable Multivibrator
(D) None of these
57. Which is the output pin number LM 741 OP_AMP?
(A) Pin number 6
(B) Pin number 4
(C) Pin number 5
(D) Pin number 3
58. When a transistor work as an amplifier its operation is in :
(A) Cut Off Region
(B) Active Region
(C) Saturation Region
(D) Inverted Region
59. How many Op-Amps are fabricated inside the LM 324 IC pack?
(A) Two Op-Amps
(B) Three Op-Amps
(C) Four Op-Amps
(D) Five Op-Amps
60. Bistable Multivibrator has :
(A) One Stable State
(B) Two Stable State
(C) Three Stable States
(D) Two Quasi Stable States
61. Which sensor detect the presence of object without any physical contact?
(A) Load cell
(B) Proximity Sensor
(C) Thermo Couple
(D) LVDT
62. Which one of the following is used for measuring torque ?
(A) Strain gauge
(B) RTD
(C) Load cell
(D) Wheat Stone Bridge
63. What is the maximum forward gate current for BFW 10 FET?
(A) 4mA
(B) 12MA
(C) 10mA
(D) 20mA
64. The input impedance of IGBT is :
(A) Medium
(B) Low
(C) Infinity
(D) High
65. In UJT when the temperature increases the intrinsic stand of ratio is :
(A) Remains the same
(B) Decreases
(C) Increases
(D) None of these
66. Which sensor can be used to stop the flow of a liquid into a pipe by means of an electric current?
(A) Load cell
(B) Solenoid valve
(C) Water level sensor
(D) Switch
67. The desirable change over period for a UPS is :
(A) 10 ms
(B) 5 ms
(C) 1 micro second
(D) I ms
68. Which type of PV cell has the highest efficiency?
(A) Hybrid
(B) Amorphous Silicon
(C) Polycrystalline silicon
(D) Mono Crystalline Silicon
70. Which technique is achieved by switching of the choppers in battery charging circuit?
(A) Constant current
(B) Constant frequency
(C) Constant Voltage
(D) Constant Power
70. Which sensor is suitable for process temperature measurement of steel?
(A) Thermister
(B) strain gauge
(C) Thermocouple
(D) Capacitive transducer
71. Which material is coated as a thin layer on the PV cells to reduce surface reflection?
(A) Gallium Indium Nitride
(B) Gallium Phosphide
(C) Silicon monoxide
(D) Silicon dioxide
73. Which one of these ICs used as a Demultiplexer?
(A) IC 74LS138
(B) IC 74LS83
(C) IC 74LS86
(D) IC 74LS92
74. Which memory device is a volatile memory?
(A) RAM
(B) ROM
(C) Hard Disk
(D) CD
75. Which one of the following is a search engine?
(A) Hot mail
(B) WWW
(C) outlook
(D) Bing
76. Which protocol is used for transferring the file from one machine to another?
(A) HTTP
(B) FTP
(C) TCP
(D) IP
77. Which decimal number is equivalent to binary number 11110?
(A) 20
(B) 12
(C) 30
(D) 16
78. A hard disk is divided into tracks, which are further subdivided into :
(A) Clusters
(B) Sectors
(C) Vectors
(D) None of these
79. In ink jet Printers the droplets of ink are deflected by :
(A) Electrically charge plates
(B) Multi directional nozzle
(C) High Pressure jets
(D) None of these
80. The effect due to which a semi conductor converts sunlight into emf is called :
(A) Photo resistive effect
(B) Seebeck effect
(C) Photo voltaic effect
(D) Hall’s effect
81. How many connecting pins are there of USB (Universal Serial Bus) port?
(A) 2
(B) 3
(C) 4
(D) 5
82. Which port is used to connect the HDD on the mother board?
(A) IDE port
(B) Com 1 port
(C) Com 2 port
(D) Floppy drive port
83. The process of converting an analog signal into a sequence of samples that are uniformly spaced is called :
(A) Quantization
(B) Sampling
(C) Encoding
(D) Modulation
84. How many I/O ports are there in Microcontroller 8051?
(A) 2
(B) 3
(C) 4
(D) 6
85. What is the range of frequency for medium wave band?
(A) 550 KHz to 650 KHz
(B) 3 MHz to 30 MHz
(C) 30 MHz to 100 MHz
(D) 200 MHz to 300 MHz
86. Which type of antenna is used for point to point communication of radio waves?
(A) Yagi antenna
(B) Dipole antenna
(C) Omnidirectional antenna
(D) Parabolic antenna
87. Which pin is marked as the master reset (RST) function in microcontroller IC 8051?
(A) PinNo:9
(B) Pin No: 20
(C) Pin No: 30
(D) Pin No: 40
88. Which of given device used in speed control of a DC motor?
(A) UJT
(B) Transistor
(C) FET
(D) SCR
89. Which of the given logic family provide minimum power dissipation?
(A) ECL
(B) RTL
(C) TTL
(D) CMOS
90. One Kilo byte is equal to _________ bytes :
(A) 1024
(B) 64
(C) 256
(D) 32
91. The internal RAM memory of 8051 micro controller is :
(A) 256 bytes
(B) 256 Bits
(C) 128 bytes
(D) 64 Bytes
92. How many instructions are available in the micro controller family instruction set?
(A) 23
(B) 37
(C) 95
(D) 111
93. Register that is used to hold the memory address of the next instruction to be executed is:
(A) Instruction decoder
(B) Control unit
(C) Program Counter
(D) Program Memory
94. In which of the following modes of propagation the ionosphere acts as the reflecting surface of the waves :
(A) Ground wave
(B) Sky wave
(C) Space Wave
(D) Direct wave
95. In an AM wave useful power is carried by :
(A) Carrier
(B) Side bands
(C) Both side bands and carrier
(D) None of these
96. A K map (Karnaugh) is an abstract form of which diagram organized as a square matrix :
(A) Block diagram
(B) Cycle diagram
(C) Venn diagram
(D) Square diagram
97. Which device convert a physical quantity into electrical quantity?
(A) Oscillator
(B) modulator
(C) Amplifier
(D) Transducer
98. A binary decoder with four inputs will have :
(A) 16 outputs
(B) 12 outputs
(C) 8 outputs
(D) 4 outputs
99. A microprocessor is a programmable logic device, 8085 microprocessor has :
(A) 16 address lines
(B) 8 address lines
(C) 4 address lines
(D) 2 address lines
100. In how many different modes a universal shift register operates :
(A) 4
(B) 5
(C) 3
(D) 1
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