Lineman - Public Works (Electrical Wing) 281/2017 Answer Key 20/2018

2/07/2018
lineman training

Post : Lineman
Department : Public Works (Electrical Wing)
Category Code : 281/17
Qualification : SSLC + Certificate in Electrical Engineering, M.G.T.E or K.G.T.E Certificate (Higher) in Electrical Light and power, Grade III Certificate as Electrician or Lineman from War Technical Training Centre, City and Guilds Examination in Electrical Engineering London Institute in A.C of the Intermediate Grade.
Question Paper Code : 20/18
Date of Test : 07-02-2018



  1. The main purpose of using shunt across a galvanometer is to __________.
    • Decrease its current range
    • Increase its current range
    • Decrease its volt range
    • Increase its volt range

  2. If two identical 220V, 8kW heating elements are connected in series across a 220 V supply, their combined rating becomes __________ kW.
    • 2
    • 8
    • 16
    • 4

  3. The unit of the quantity of electricity is __________.
    • Ampere Second
    • Coulomb
    • Ampere per second
    • Both Ampere Second and Coulomb

  4. The relative permittivity of vacuum is __________.
    • 8.854×10−12 Farad/metre
    • 4Ï€×10−7 Henry/metre
    • 8.854×10−12 Henry/metre
    • None of these

  5. The unit of conductivity or specific resistance is __________.
    • Siemens/metre
    • ohm/metre
    • ohm-metre
    • Siemens
    Question error

  6. A switch should be placed at any height __________ above the floor level.
    • 1.5 m
    • 1.3 m
    • 1.2 m
    • 1.6 m

  7. For lamps with wattage above 300 W, __________ lamp holders are used.
    • Edison screw type
    • Goliath Edison screw type
    • Bracket
    • Bayonet cap

  8. The composition of Electrician’s solder consists of __________.
    • Tin 60% Lead 40%
    • Tin 40% Lead 60%
    • Tin 90% Lead 10%
    • Tin 10% Lead 90%

  9. The size of the fan is generally determined by its __________.
    • length
    • thickness
    • diameter
    • sweep

  10. An auto transformer works on the principle of __________.
    • Statically induced emf
    • Self induced emf
    • Mutually induced emf
    • Dynamically induced emf

  11. At unity power factor, the effect of armature reaction is __________.
    • Demagnetizing
    • Magnetizing
    • Cross magnetizing
    • None of these

  12. A current transformer is usually a __________ transformer.
    • step down
    • step up
    • shell type
    • isolation

  13. When a moving iron instrument is connected in an AC circuit it indicates __________.
    • Average value
    • Maximum Value
    • RMS value
    • None of these

  14. The moving coil in a dynamometer type wattmeter is connected __________.
    • In series with the fixed coil
    • Across the load
    • In series with the load
    • Across the supply

  15. The type of rotor is used in low and medium speed alternators are __________.
    • smooth cylindrical type
    • non-salient pole type
    • salient pole type
    • squirrel cage type

  16. The number of slip rings in a rotating field system type alternator is __________.
    • 2
    • 3
    • 4
    • 6

  17. The transformer connection used at the substation end of the transmission line is __________.
    • Star - Star
    • Delta - Delta
    • Delta - Star
    • Star - Delta

  18. The essential condition for the parallel operation of two single phase transformers should be __________.
    • The same voltage ratio
    • The same polarity
    • The same phase sequence
    • Both "The same polarity" and "The same phase sequence"
    Question error

  19. The method of speed control of series motor used in electric trains is __________.
    • Field tapping method
    • Field diverter method
    • Series parallel method
    • Voltage control method

  20. The dc generator used for arc welding process is __________.
    • Cumulatively compound
    • Series wound
    • Under compound
    • Deferentially compound

  21. An electric current of 10 A is divided into two branches of resistance 2 Ω and 3 Ω respectively. The branch current in 3 Ω resistance is __________ A.
    • 4
    • 6
    • 3
    • 2

  22. A 3φ induction motor is wound for 4 poles, the synchronous speed of the motor supplied from a 50 Hz system is _________ rpm.
    • 1440
    • 1500
    • 1400
    • 1600

  23. Armature torque produced in a dc series motor is proportional to __________.
    • The field current
    • The armature current
    • The square of the armature current
    • None of these

  24. During charging of a lead acid cell, the specific gravity of the electrolyte is __________.
    • Decreases
    • Increases
    • Does not change
    • None of these

  25. The power consumption of purely capacitive circuit is __________.
    • zero
    • unity
    • less than unity
    • greater than unity

  26. A coil has a resistance of 6Ω and reactance of 8Ω are connected in series, its impedance is __________ Ω.
    • 36
    • 64
    • 14
    • 10

  27. The emf of a Fully charged lead acid cell is __________ volt.
    • 1.21
    • 2.1
    • 1.8
    • 1.4

  28. The transfer of heat from the heating element with in to material being ironed in an electric iron is done by using __________.
    • Pressure plate
    • Sole plate
    • Heel plate
    • Thermostat

  29. Increased capacitance can be obtained by connecting the given capacitors in __________.
    • Series
    • Parallel
    • Series Parallel
    • None of these

  30. Three resistances of 4Ω each are connected in parallel the equivalent resistance will be __________Ω.
    • 4/3
    • 3/4
    • 1/4
    • 16

  31. The compensating windings are connected in __________ of dc generator.
    • series with field winding
    • parallel with field winding
    • series with armature winding
    • parallel with armature winding

  32. One Farad = __________.
    • one coulomb/sec
    • one joule/coulomb
    • one joule/sec
    • one coulomb/volt

  33. The direction of force produced on a current carrying conductor placed in a magnetic field can be determined by __________.
    • Fleming’s left hand rule
    • Fleming’s right hand rule
    • Lenz’s law
    • Cork screw rule

  34. Which one of the following material is an acceptor impurity?
    • Antimony
    • Silicon
    • Boron
    • Germanium

  35. A Full wave bridge rectifier uses __________ diodes.
    • 1
    • 2
    • 3
    • 4

  36. Hysterisis loss is proportional to __________.
    • square of the frequency
    • frequency
    • square of the thickness
    • thickness

  37. The critical field resistance of a shunt generator should be __________.
    • Greater than its shunt field resistance
    • Smaller than its shunt field resistance
    • Equal to the shunt field resistance
    • None of these

  38. The knee voltage/cut in voltage of a silicon diode is __________.
    • 0.2 V
    • 0.3 V
    • 0.5 V
    • 0.7 V

  39. The reciprocal of impedance is __________.
    • Susceptance
    • Conductance
    • Admittance
    • Resistance

  40. The instrument used for measuring current in a current carrying conductor without interrupting the circuit is __________.
    • MI ammeter
    • Clamp on ammeter
    • Current transformer
    • Potential transformer

  41. The application of inductor/ballast in fluorescent lamp circuit is to __________.
    • Increase the current at the time of starting
    • limit the current through the lamp
    • Reduce the induced emf
    • None of these

  42. Which one of the following material must have negative temperature coefficient of resistance?
    • Copper
    • Brass
    • Mica
    • Manganin

  43. The effective value of sine wave is __________.
    • 0.707×Vmax
    • 0.637×Vmax
    • 0.707×Vaverage
    • 0.637×Vaverage

  44. The bending of electrodes due to over charging and discharging in a cell is known as __________.
    • Hard Sulphation
    • Buckling
    • Para short
    • None of these

  45. The heavily dopped region of a bipolar junction transistor is __________.
    • Emitter
    • Base
    • Collector
    • None of these

  46. The unit of reluctance is __________.
    • Ampere turns
    • Ampere turns/weber
    • Weber/Ampere turns
    • Weber/metre2

  47. The fuse element used in HRC fuse is __________.
    • Copper
    • Tungsten
    • Aluminium
    • Silver

  48. The switch is commonly used to control a lamp from three places is __________.
    • One way switch
    • Two way switch
    • Rotary switch
    • Intermediate switch

  49. The load on each power sub circuit should normally be restricted to __________.
    • 800 W
    • 3000 kW
    • 3000 W
    • 800 kW

  50. Dynamometer type instruments can be used as a __________.
    • dc circuit only
    • AC circuit only
    • For both AC and DC circuits
    • None of these

  51. The main winding and starting winding of a single phase induction motor are connected in __________ across the supply.
    • Series
    • Series - Parallel
    • Either "Series" or "Series - Parallel"
    • Parallel

  52. Damper winding in a synchronous motor __________.
    • Reduces windage losses
    • Serves to start the Motor
    • Improves the power factor of the motor
    • Increase the hunting of the motor

  53. Buchholz relay is used on __________ transformer.
    • Shell type
    • Welding
    • Oil cooled
    • Air cooled

  54. The direction of rotation of an Induction motor can be changed by changing __________.
    • The supply frequency
    • The supply Voltage
    • The speed
    • The phase sequence

  55. In a Star delta starter, at the time of starting, the phase voltage across the terminals of a squirrel cage induction motor is __________ line voltage.
    • √3 times
    • 1/√3 times
    • 3 times
    • 1 3 times

  56. The connection of a Zener diode in a circuit is always __________.
    • Forward biased
    • In series
    • Reverse biased
    • Positively biased

  57. The most commonly used wiring system in electrical wiring installation is __________.
    • Tree system
    • Ring main system
    • Distribution system
    • None of these

  58. The mettalic sheath is provided in cables to safeguard against __________.
    • Mechanical injury
    • Moisture content
    • Rusting
    • Serving

  59. A device which opens or closes an auxiliary circuit under predetermined conditions in the main circuit is __________.
    • Relay
    • Circuit breaker
    • Switch
    • Fuse

  60. The most common method to test the armature winding for short and open coils is __________.
    • Insulation resistance test
    • Drop test
    • Growler test
    • Ground test

  61. The maximum reverse voltage that a diode can withstand is referred as __________.
    • Peak inverse voltage
    • Barrier voltage
    • Threshold voltage
    • Knee voltage

  62. The full load copper loss of a transformer is 400 W. The Copper loss at half load will be __________.
    • 100 W
    • 100 kW
    • 200 W
    • 800 W

  63. In a wiring two lamps should be switched ‘ON’ at a time, the wiring is known as __________.
    • Corridor wiring
    • Godown wiring
    • Hostel wiring
    • Tunnel wiring

  64. ELCB’s are specially used to disconnect the supply under __________ conditions.
    • Open circuit
    • Over load
    • Short circuit
    • None of these

  65. The maximum safe temperature of class B insulation material is __________.
    • 130°C
    • 105°C
    • 90°C
    • 120°C

  66. The controlling torque in an indicating instrument is __________.
    • Decreases with the deflection of moving system
    • Opposes the deflection torque
    • Proportional to supply voltage
    • None of these

  67. Form Factor is defined as ratio :
    • Average Value/RMS Value
    • RMS Value/Average Value
    • RMS VALUE/MAXIMUM VALUE
    • MAXIMUM VALUE/RMS VALUE

  68. The damping torque provided by PMMC Instruments is __________.
    • Air friction damping
    • Fluid friction damping
    • Eddy current damping
    • None of these

  69. When the motor is stationary, the frequency of rotor current in an Induction motor is __________.
    • Same as the supply frequency
    • Depends upon slip
    • Depends upon synchronous speed
    • None of these

  70. Kirchoff’s voltage law is concerned with __________.
    • IR drops
    • Battery emf’s
    • Junction voltages
    • Both "IR drops" and "Battery emf’s"

  71. A charge of 100 coulomb is transferred in a circuit by a current of 1A. Time taken by this current is __________ seconds.
    • 1
    • 10
    • 100
    • 1000

  72. The voltage induced in the armature of a dc generator is __________.
    • Pulsating dc
    • DC
    • Rectified ac
    • AC

  73. The power taken by a 3 phase star connected load is given by the expression :
    • 3 VL IL cos φ
    • √3 VL IL cos φ
    • √3 VP IP cos φ
    • None of these

  74. The positive plate of lead acid cell is __________.
    • Lead peroxide
    • Sponge lead
    • Lead sulphate
    • Pottasium hydroxide

  75. The starting winding of a resistance start induction motor have __________.
    • Low resistance and higher reactance
    • High resistance and low reactance
    • Low resistance and low reactance
    • High resistance and high reactance

  76. In a lap winding, the number of brushes required is equal to __________.
    • Number of poles
    • No of pair of poles
    • Pole pitch
    • 2

  77. The open circuit test on a transformer is always made on __________.
    • High voltage winding
    • Low voltage winding
    • Either "High voltage winding" or "Low voltage winding"
    • None of these

  78. In a parallel circuit, all components must __________.
    • have same potential difference across them
    • have the same value
    • carry the same current
    • none of these

  79. For a given dc generator the generator voltage depends on __________.
    • Flux only
    • Speed only
    • Both Flux and Speed
    • None of these

  80. The test is conducted to check whether switches are connected in phase/live cables or not is __________.
    • Continuity test
    • Ground test
    • Open circuit test
    • Polarity test

  81. Which of the following peak is also known as ‘Dapsang’?
    • The Everest
    • Godwin Austen
    • Anamudi
    • Kanchenjunga

  82. How many islands are there in the Lakshadweep?
    • 34
    • 32
    • 36
    • 38

  83. The smallest neighbouring country of India is :
    • Nepal
    • Bangladesh
    • Myanmar
    • Bhutan

  84. The Revolt of 1857 broke out at :
    • Kanpur
    • Delhi
    • Meerut
    • Jhansi

  85. When was the Jallianwala Bagh massacre?
    • April 13, 1918
    • April 13, 1919
    • April 19, 1913
    • April 18, 1919

  86. Who gave Indian National Congress its name?
    • Dadabhai Naoroji
    • A.O. Hume
    • W.C. Banerjee
    • Firoz Shah Mehta

  87. Who coined the term ‘PAKISTAN’ for the first time?
    • Muhammad Iqbal
    • Muhammad Ali Jinnah
    • Choudhry Rahmat Ali
    • Khan Abdul Ghaffar Khan

  88. At where the congress met in 1920, which decided to conduct a Non-Co-operation movement against the British?
    • Bombay
    • Calcutta
    • Nagpur
    • Chauri Chaura

  89. Who is known as ‘Bardoli Gandhi’?
    • Sardar Vallabhbhai Patel
    • Dr. Rajendra Prasad
    • C. Rajagopalachari
    • Baba Amte

  90. The Prime Minister of India, who implemented the Twenty Point Programme in 1975?
    • Rajiv Gandhi
    • Indira Gandhi
    • Dr. P.V. Narasimha Rao
    • Dr. Manmohan Singh

  91. When was Rabindranath Tagore’s visit to Sree Narayana Guru?
    • 1925
    • 1924
    • 1922
    • 1921

  92. Which Kerala social reformer described the British rule as ‘Rule of White Devil’ or ‘Ven Neechan’?
    • Ayyankali
    • Pandit Karuppan
    • Vaikunda Swamikal
    • Vagbhatananda

  93. Who among the following person is known as the ‘Political Father of the Ezhavas’?
    • Sree Narayana Guru
    • Kumaran Asan
    • Dr. Palpu
    • C. Kesavan

  94. Who conducted the famous ‘Thali Road Strike’?
    • C. Krishnan
    • T.K. Madhavan
    • Kurumban Daivathan
    • Arattupuzha Velayudha Panicker

  95. Who is known as the ‘Father of Kerala Literacy’?
    • Brahmanda Sivayogi
    • Kuriakose Elias Chavara
    • Vakkom Abdul Khader Moulavi
    • Swadesabhimani Ramakrishna Pillai

  96. Which of the following country, recently levied environment tax for preventing pollution?
    • China
    • America
    • Sweden
    • Brazil

  97. The ‘G-20’ meeting of 2016 was held at :
    • Paris
    • New York
    • Tokyo
    • Shanghu
    Question error

  98. ‘Why I am an Atheist’? Is the autobiography of :
    • Bhagat Singh
    • Milkha Singh
    • Chandrasekhar Azad
    • Bal Gangadhar Tilak

  99. Which Indian City is known as the ‘Mecca of Indian foot ball’?
    • Chennai
    • Calcutta
    • Kochi
    • Bangalore

  100. Where is the central office of the Reserve Bank of India?
    • Mumbai
    • Calcutta
    • Delhi
    • Pune

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