Tradesman Electrical Technical Education 586/2017 Answer Key 98/2018


Post: Tradesman (Electrical)
Department: Technical Education
Category Code: 586/17
Question Paper: 98/18
Qualification: Technical High School Leaving Certificate Examination (THSLC); SSLC + National Trade Certificate (NTC) in electrical
Date of Test: 18-09-2018


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  1. Unit of Electrical energy is __________.
    • Ampere Hour
    • Kilowatt Hour
    • Kilowatt
    • Kilovolt Ampere

  2. Magnitude of electrical shock on a human body depends upon __________.
    • Current flow through the body
    • Path of electric current through the body
    • Duration of electric shock
    • All of these

  3. One of the following components is a passive device __________.
    • Field effect transistor
    • Silicon controlled rectifier
    • Air core inductor
    • Zener diode

  4. Armouring is provided in the underground cable to safeguard against __________.
    • Mechanical injury
    • Moisture entry
    • White ant attack
    • Bursting of failure

  5. The main switch is used in single phase supply is to be provided with __________.
    • Fuse in both line and neutral
    • A link in the line and a fuse in the neutral
    • A fuse in the line and a link in the neutral
    • None of these

  6. Which of the following units is the correct one for reactive power?
    • Kilovolt Ampere
    • Kilowatt
    • Megawatt
    • Kilovolt Ampere reactive

  7. The type of insulator used for holding high transmission overhead conductor on straight running of poles __________.
    • Post insulator
    • Pin insulator
    • Stay insulator
    • Shackle insulator

  8. A water pump lifts less water than earlier, what could be the reason for this fault?
    • Impeller damaged
    • Level of water in pump is too high
    • Pump running in reverse direction
    • Motor running fast

  9. In an energy meter the holes of the aluminium disc helps to __________.
    • Prevent creeping error
    • Reduce the resistance
    • Reduce the friction
    • Reduce the weight of disc

  10. Earth leakage circuit breaker is used to disconnect the supply from __________.
    • Short circuit
    • Ground fault
    • Open circuit
    • Overload

  11. In a transformer, the chemical contained inside the Breather is __________.
    • Mineral oil
    • Salt
    • Silica gel
    • Water

  12. The device which can be used as switch as well as protective device is __________.
    • Double pole Iron clad switch
    • Intermediate switch
    • Earth leakage circuit breaker
    • Miniature circuit breaker

  13. Size of hammer is specified by __________.
    • Length of hammer
    • Diameter of the phase
    • Height of the head
    • Weight of the hammer

  14. Gravity controlled instrument has to be kept in __________.
    • Vertical position
    • Horizontal position
    • Inclined position
    • Any position

  15. A sodium vapour lamp gives which colour of light?
    • Green colour
    • White colour
    • Yellow colour
    • Red colour

  16. High pressure mercury vapour lamp has three pin bayonet cap lamp holder. This is done for __________.
    • To make a three phase connection
    • Prevent wrong connection
    • To earth the lamp
    • None of these

  17. A choke is generally used in series with fluorescent tube circuit to __________.
    • Improve the power factor
    • Prevent flickering
    • To make high voltage for conduction
    • Suppress radio interference

  18. Three phase distribution transformer are usually connected in __________.
    • Delta/Delta
    • Star/Star
    • Star/Delta
    • Delta/Star

  19. Conductivity of aluminium is __________.
    • Sixty percent to that of copper
    • Forty percent to that of copper
    • Eighty percent to that of copper
    • Fifty percent to that of copper

  20. The flux per unit area of material is known as __________.
    • Current density
    • Flux density
    • Magnetic lines of force
    • Electromotive force

  21. Which lamp has more resistance with same applied voltage?
    • Forty watts
    • Hundred watts
    • Sixty watts
    • Fifteen watts

  22. Tool used for cutting, twisting or holding of wires or cables for terminations __________.
    • Insulated combination plier
    • Insulated side cutting plier
    • Insulated round nose plier
    • Insulated flat nose plier

  23. Alternating current is converted into direct current by __________.
    • Alternator
    • Motor
    • Rectifier
    • Transformer

  24. Buchholz relay is generally used for the protection of __________.
    • Transmission line
    • Transformer
    • Alternator
    • Generator

  25. Which of the following is a conventional source of energy?
    • Coal
    • Solar
    • Small Hydro
    • Wind

  26. Advantage of Hydroelectric power station is __________.
    • Low cost
    • Free from pollution
    • No fuel transportation problem
    • All of these

  27. Which of the following system electric power may be transmitted?
    • Overhead system
    • Underground system
    • Overhead and underground system
    • None of these

  28. The fuel used in nuclear generating power plant is __________.
    • Crude oil
    • Isotopes of Uranium
    • Liquefied hydrogen
    • Methane

  29. What is the basic three electrical quantities?
    • Resistance, Capacitance, Inductance
    • Power, Voltage, Conductance
    • Voltage, Current, Resistance
    • Current, Reactance, Inductance

  30. Value of short circuit current will flow in the circuit is __________.
    • Zero
    • Very low
    • Normal
    • Infinite

  31. Motor used in household refrigerator is __________.
    • D.C. Series motor
    • Single phase induction motor
    • D.C. Shunt motor
    • Universal motor

  32. Which motor would you select for vacuum cleaner?
    • Universal motor
    • Repulsion motor
    • Hysteresis motor
    • None of these

  33. The damper winding in a synchronous motor is generally used __________.
    • To provide starting torque only
    • To reduce noise level
    • To reduce eddy current
    • To prevent hunting and provide the starting torque

  34. An Autotransformer which has only one winding may be used as __________.
    • Step-up transformer
    • Step-down transformer
    • Step-up and Step-down transformer
    • None of these

  35. The unit of solid angle is a __________.
    • Lumen
    • Radian
    • Steradian
    • Candela

  36. Full form of MCCB is __________.
    • Moulded Case Circuit Breaker
    • Moulded Case Current Breaker
    • Miniature Current Circuit Breaker
    • Minimum Current Circuit Breaker

  37. The star delta starter is used in __________.
    • Flour mills
    • Pumps
    • Machine tools
    • All of these

  38. Motor used in ceiling fan is __________.
    • Split phase motor
    • Capacitor start motor
    • A.C. series motor
    • Repulsion motor

  39. Rotor resistance starter used to which of the following motors?
    • Slip ring motor
    • Heavy duty squirrel cage motor
    • Medium duty squirrel cage motor
    • Double cage motor

  40. The thickness of insulation provided in the conductor in cable depends upon the factor is __________.
    • Resistivity of the conductor
    • Current to be carried
    • Operating voltage
    • Power factor

  41. The structure of pin type insulator is wavy. It is done to increase __________.
    • Mechanical strength
    • Puncture strength
    • Flash overvoltage
    • Thermal strength

  42. Carbon arc lamp are commonly used in __________.
    • Cinema projectors
    • Domestic lighting
    • Street lighting
    • Photography

  43. Which of the following is one not a part of circuit breaker?
    • Explosion plot
    • Conservator
    • Operating mechanism
    • Fixed and moving contact

  44. The handle of iron box is made up of __________.
    • Bakelite
    • Ebonite
    • Chromium
    • Bakelite and Ebonite

  45. Lumen per watt is the unit of __________.
    • Light flux
    • Luminous efficiency
    • Luminous intensity
    • Brightness

  46. The generating voltage and frequency in India is __________.
    • 11 kV and 50 Hz
    • 11 kV and 60 Hz
    • 220 kV and 50 Hz
    • 220 kV and 60 Hz

  47. The lamp generally used for lighting purpose is __________.
    • Carbon filament lamp
    • Arc lamp
    • Tungsten filament lamp
    • All of these

  48. In running condition voltage across tube starter is __________.
    • 110 V
    • 180 V
    • 220 V
    • Zero

  49. Capacitor is used in tube circuit is __________.
    • To improve the power factor
    • To improve the voltage
    • To safeguard the tube
    • To give the full light

  50. The synchronous speed of an induction motor refers to the speed of the __________.
    • Rotor
    • Armature
    • Speed marked on the nameplate
    • Rotating magnetic field

  51. Three phase induction motor started by DOL starter, the short circuit current is protected by __________.
    • No volt coil
    • Overload relay
    • Back off fuse
    • Protective earth connection

  52. Cables are drawn through the pipe and terminated. The system of wiring is called __________.
    • PVC casing and capping wire
    • Conduit wiring
    • Teak wood batton wiring
    • Teak wood casing caping wiring

  53. As compared to rewirable fuses HRC fuse have __________.
    • High speed of operation
    • High rupturing capacity
    • No ageing effect
    • Low rupturing capacity

  54. The following application D.C. is essential __________.
    • Electric traction motor
    • Electric home appliances
    • Machine shop motor
    • Illumination

  55. Which of the following does not change in a transformer?
    • Current
    • Voltage
    • Frequency
    • All of these

  56. Which winding in a transformer has more number of turns?
    • Low voltage winding
    • High voltage winding
    • Winding does not depend upon number of turns
    • None of these

  57. In a D.C. machine the number of brushes in lap winding is __________.
    • Same number of poles
    • Double number of poles
    • Half of the number of poles
    • Two numbers

  58. Compensating windings are used in D.C. generator is __________.
    • To reduce eddy current by local short circuit
    • To provide path for the circulation of cooling air
    • To neutralize the cross magnetic effect of armature reaction
    • None of these

  59. Red colour wire is generally known for __________.
    • Insulated wire
    • Earth wire
    • Neutral wire
    • Phase wire

  60. Stepper motor is __________.
    • Single phase motor
    • Two phase motor
    • Three phase motor
    • D.C. motor

  61. The positive pole of dry cell is made of __________.
    • Copper
    • Zinc
    • Carbon
    • Mercury

  62. The energy of secondary cells are renewed by __________.
    • Heating it
    • Passing current through it
    • Renewing its chemicals
    • It can’t be renewed at all

  63. When cells are connected in parallel, the result is __________.
    • The current capacity increases
    • The current capacity decreases
    • The EMF capacity increases
    • The EMF capacity decreases

  64. The composition of electrician solder is __________.
    • Tin-40%, Lead-60%
    • Tin-50%, Lead-50%
    • Tin-90%, Lead-10%
    • Tin-60%, Lead-40%

  65. Fire extinguisher used in the event of electric fire is __________.
    • Dry powder type
    • Gas cartridge type
    • Halon type
    • Foam type

  66. Britania straight joint is used for __________.
    • Increase the length of the conductor
    • Increase the resistance of the conductor
    • Increase the conductivity of the conductor
    • Increase the mechanical strength of the conductor

  67. E.C.E. stands for __________.
    • Electrovalent Chemical Equilant
    • Electro Chemical Equilant
    • Electrolysis Cathode Equilant
    • Electro Cardio Equilant

  68. A current of ten ampere is same as __________.
    • Ten joules per second
    • Ten watts per second
    • Ten volts per second
    • Ten coulombs per second

  69. The power dissipated in a pure capacitor is __________.
    • Zero
    • Unity
    • Proportional to the applied voltage
    • Proportional to the value of capacitance

  70. Which of the following has positive temperature co-efficient?
    • Germanium
    • Aluminium
    • Graphite
    • Rubber

  71. I.G.B.T. stands for __________.
    • Integrated Gate Bidirectional Transistor
    • Integrated Gate Blocky Transistor
    • Integrated Gate Bipolar Transistor
    • Insulated Gate Bipolar Transistor

  72. In Fleming’s right hand rule, the forefinger indicates __________.
    • The direction of induced EMF
    • The direction of motion of the conductor
    • The direction of induced current
    • The direction of magnetic flux

  73. Diode is a __________.
    • Multidirectional device
    • Unidirectional device
    • Bidirectional device
    • None of these

  74. Earth wire or ground wire is made of __________.
    • Copper
    • Iron
    • Aluminium
    • Galvanized steel

  75. Which tool is used to transfer measurement to the inside calliper?
    • Odd leg calliper
    • Steel rule
    • Genny calliper
    • Divider

  76. Chisel used for making rectangular holes in wood is __________.
    • Firmer Chisel
    • Paring Chisel
    • Mortise Chisel
    • Beavel - Firmer Chisel

  77. Name the element used as impurity to produce N-type semiconductor __________.
    • Gallium
    • Boron
    • Aluminium
    • Arsenic

  78. Which of the following is known as metal rectifier?
    • Gas tube diode
    • Silicon diode
    • Copper oxide rectifier
    • All of these

  79. Type of filter can be used along with a full wave rectifier only is __________.
    • Series inductor filter
    • Pi filter
    • Resistance Capacitance filter
    • Choke input LC filter
    Question Error

  80. The difference between peak positive and peak negative values in AC is called __________.
    • Effective value
    • Peak to Peak value
    • Maximum value
    • Average value

  81. Who was the main writer who assisted William Logan in the writing the ‘Malabar Manual’?
    • O. Chanthu Menon
    • A. Ayyappan
    • V.P. Menon
    • Itti Achuthan

  82. Malabar Manual was first published in __________.
    • 1889
    • 1887
    • 1886
    • 1880

  83. Magna Carta was signed in __________.
    • 1215
    • 1342
    • 1299
    • 1432

  84. Prathyksha Raksha Daiva Sabha was founded by __________.
    • Poykayil Yohannan
    • K. Maadhavan
    • Dr. Palpu
    • Vagbhatananda

  85. Who was known as Kerala Lincolon?
    • EMS Nambudirippad
    • Pandit Karuppan
    • A.K. Gopalan
    • K.R. Gouri Amma

  86. Atmavidya Kahalam was written by __________ in 1929.
    • Vagbhatananda
    • Vakkom Abdul Khadar
    • Kalidasan
    • Swami Sivayogi

  87. The famous Kizhariyur bomb case was in __________.
    • 1857
    • 1940
    • 1945
    • 1942

  88. Who started servants of Mary Immaculate?
    • K. Karuppan
    • Chavara Achan
    • K. Krishnan
    • Makthi Thangal

  89. The Slavery abolished in America was __________.
    • 1900
    • 1864
    • 1865
    • 1765

  90. Right to Health is mentioned in __________ of U.N. Declaration Human Rights.
    • Article 8
    • Article 20
    • Article 25
    • None of these

  91. Kallumala Samara was broken out in 1915 in the __________ district of Kerala.
    • Thiruvananthapuram
    • Kozhikode
    • Alappuzha
    • Kollam

  92. “Liberty, Equality and Fraternity” is the slogan of __________ Revolution.
    • American
    • French
    • Chinese
    • None of these

  93. The most prominent work on Partition is Freedom at Midnight was written by __________.
    • Annie Besant
    • Dominique Lapierre
    • Larry Augustine
    • Abdul Kalam

  94. At the time of Indian Independence Hyderabad was ruled by __________.
    • Ali Khan
    • Mohammed
    • Abdul Razak
    • None of these

  95. Who was the murderer of Canolly, the District Collector of Malabar?
    • Pokker Haji
    • Kunhali
    • Haider
    • Vadakkeveettil Mohammed

  96. The Dutch East India Company started in __________.
    • 1600
    • 1602
    • 1605
    • 1700

  97. The famous Aruvippuramprathishta was the challenge against the Brahmin by __________.
    • Nanu Asan
    • Guru Govind
    • K. Karuppan
    • Palpu

  98. Hunter Commission was appointed in __________.
    • 1880
    • 1881
    • 1884
    • 1882

  99. Bharath Matha Society was founded by __________.
    • J.M. Chatterjee
    • Chandrashekhar Azad
    • N. Bhattachari
    • None of these

  100. Who had written “India’s struggle for Independence”?
    • Bipin Chandra
    • Sumit Sarkar
    • Ray Choudhar
    • A.R. Desai

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