Electrician - Health Services, Medical Education Service, Archaeology Answer Key 047/2017

electrician wire helmet

Name of post : Electrician
Department : health services/medical education service/archaeology
Category No : 235/16, 351/16, 448/16
Paper code : 47/2017
Date of test :03/05/2017 


  1. Colpitt’s oscillator is a
    • Square wave oscillator
    • Sinusoidal Oscillator
    • Nonsinusoidal oscillator
    • Sound generator

  2. According to Faraday’s law, induced emf is directly proportional to
    • Maximum flux
    • Rate of change of flux linkages
    • Time
    • Flux density

  3. Differential compound generator is a/an
    • Self-excited generator
    • Separately excited generator
    • Alternator
    • Function generator

  4. EMF equation of a dc generator is
    • None of these

  5. Speed is a ____________ quantity.
    • Scalar
    • Vector
    • A or B
    • None of these

  6. Which type of DC compound generator is used when the load is very far away from the generator?
    • Level compounded
    • Under compounded
    • Over compounded
    • Differentially compounded

  7. Pitch of lap winding
    • YB
    • YB – YF
    • YB + YF
    • YF

  8. Transformers are rated in
    • KVA
    • KW
    • KVAR
    • MW

  9. In a transformer, I1/ I2 =
    • E1/E2
    • E2/E1
    • N1/N2
    • None of these

  10. Turns ratio of isolation or one-to-one transformer is
    • Greater than 1
    • Less than 1
    • 1
    • 2

  11. Hysteresis loss, Wh =

  12. Class 0.1 instruments are used as
    • Portable instrument
    • Industrial measuring instruments
    • Precision measuring instruments
    • Panel measuring instrument

  13. Which is an absolute instrument?
    • Ammeter
    • Wattmeter
    • Voltmeter
    • Tangent Galvanometer

  14. If the pointer of measuring instrument moves quickly to its final deflected position, it is
    • Overdamped
    • Under damped
    • Critically damped
    • Not damped

  15. Power factor =
    • KVA/KW
    • KVAR/KW
    • KW/KVAR
    • KW/KVA

  16. The ratio Z/R is
    • Reciprocal of power factor
    • Power factor
    • Reciprocal of form factor
    • Form factor

  17. PIC is the part of
    • MI voltmeter
    • Induction energymeter
    • Digital energy meter
    • Induction wattmeter

  18. Tong-tester is used to measure
    • Power
    • Voltage
    • Energy
    • Alternating current

  19. Collector current, IC of BJT =
    • IE + IB
    • IE – IB
    • IE – 2IB
    • IE + 2IB

  20. Capacitive reactance is
    • Directly proportional to frequency
    • Directly proportional to capacitance
    • Independent on frequency
    • Inversely proportional to frequency

  21. Current gain of common base amplifier is
    • Always less than 1
    • Always greater than 1
    • Equal to 1
    • None of these

  22. Frequency of rotor current of induction motor is
    • Frequency of stator current
    • Slip × frequency of stator current
    • Frequency of stator current/slip
    • Slip/frequency of stator current

  23. Which of the following motor is not self-starting?
    • Universal motor
    • DC shunt motor
    • Single phase induction motor
    • 3 phase induction motor

  24. Electric charge, Q =
    • V*t
    • V/t
    • I/t
    • I*t

  25. Which is wrong about the speed control of dc shunt motor by field control method?
    • It is economical
    • Speed can be varied above normal speed
    • Speed cannot be varied above normal speed
    • Commutation becomes unsatisfactory

  26. Which is constant speed motor?
    • Synchronous motor
    • Universal motor
    • DC series motor
    • DC compound motor

  27. Unit of mmf
    • Weber
    • Ampere turns
    • Tesla
    • Henry

  28. Negative plate of lead acid cell is
    • Lead peroxide
    • Lead sulphate
    • Nickel
    • Spongy lead

  29. As per IE rule, the leakage current in an installation should not exceed ___________ part of full load current of installation.
    • 1/50
    • 1/600
    • 1/5000
    • 1/1000

  30. Capacitance =
    • Potential difference / Charge 
    • Charge / Current
    • Current / Charge
    • Charge / Potential difference

  31. Permeance is the reciprocal of
    • Permittivity
    • mmf
    • Reluctance
    • Flux

  32. Energy stored in magnetic field, E =
    • (LI2)/2
    • (LI)/2
    • (L2I2)/2
    • (L2I)/2

  33. The Ah efficiency of lead acid cell is normally between
    • 90 – 95%
    • 30 – 35%
    • 70 – 75%
    • 60 – 65%

  34. Insulation resistance can be measured using
    • Tong tester
    • Multimeter
    • Meggar
    • Ohmmeter

  35. There is no control spring in
    • PMMC voltmeter
    • Induction energymeter
    • PMMC ammeter
    • Dynamometer instrument

  36. Standard form of an alternating voltage, e =
    • Em Sin 2π fT
    • Em Sin 2π ft
    • Em Cos 2π fT
    • Em Cos 2π ft

  37. A sine wave has an angular frequency of 100radian/sec. Its frequency is
    • 100 Hz
    • 200 Hz
    • 25 Hz
    • 50 Hz

  38. Percentage slip, S =
    • 100 (Ns - N) / Ns
    • 100 (N - Ns) / N
    • 100 (Ns - N) / N
    • 100 (N - Ns) / Ns

  39. Stray losses are
    • Copper loss
    • Magnetic and mechanical losses
    • Eddy current loss
    • Hysteresis loss

  40. Transformer gives maximum efficiency, when
    • Hysteresis loss = Eddy current loss
    • Copper loss = Hysteresis loss
    • Copper loss = Mechanical loss
    • Copper loss = Iron loss

  41. All day efficiency of transformer is
    • Output in KW/ Input in KW (for 24 hrs)
    • Output in KVA/ Input in KVA (for 24 hrs)
    • Output in KW/ Input in KVA (for 24 hrs)
    • Output in KWh/ Input in KWh (for 24 hrs)

  42. A transformer consists of 1000 primary turns and 1600 secondary turns. What is the secondary induced emf if primary voltage is 250 V?
    • 360 V
    • 400 V
    • 500 V
    • 450 V

  43. Synchronous speed, Ns =
    • 120 f/ p
    • 120 p/ f
    • 60 p/ f
    • 60 f/ p

  44. Which of the following has negative temperature coefficient of resistance?
    • Silicon
    • Copper
    • Iron
    • Brass

  45. Secondary of a CT must be connected to an ammeter or must be short-circuited in order to avoid
    • High secondary emf
    • Increase in iron loss
    • Excessive heating of the core
    • All of these

  46. Rotor speed of 3 phase, 4 poles, 50 Hz induction motor
    • 1440 RPM
    • 1500 RPM
    • 1560 RPM
    • 1600 RPM

  47. Barrier potential of silicon at room temperature of 25°C is
    • 0.3 V
    • 0.4 V
    • 0.7 V
    • 0.9 V

  48. Power rating of low power transistors are
    • up to 10 watts
    • up to 20 watts
    • Less than 2 watts
    • up to 15 watts

  49. Convert decimal 9 to binary.
    • 1011
    • 1000
    • 1100
    • 1001

  50. Boolean expression for OR gate is
    • Y = AB
    • Y = A + B
    • Y = A̅ ̅B̅
    • Y = A̅ + B̅

  51. Which connection is best suited for 3 phase, 4 wire service?
    • Delta-Delta
    • Star-Star
    • Delta-Star
    • Star-Delta

  52. The scale range marked on the dial of the meggar is
    • 500 Megaohm to zero ohm
    • Infinity to zero ohm
    • 50 Megaohm to zero ohm
    • 1000 Megaohm to zero ohm

  53. Fusing factor is
    • Ratio between minimum fusing current to current rating
    • Time taken by a fuse to interrupt the circuit in the event of fault
    • Safe maximum current that can pass through it continuously without overheating
    • Current at which fuse element melts

  54. 1500 RPM = ____________ RPS.
    • 50
    • 60
    • 40
    • 25

  55. 1 Kg wt = ___________ Newton.
    • 5.3
    • 6.7
    • 9.8
    • 12.6

  56. The direction of force produced on a current carrying conductor placed in a magnetic field can be determined by
    • Fleming’s Right Hand Rule
    • Cork Screw Rule
    • Fleming’s Left Hand Rule
    • Lenz’s Law

  57. Differential compound generators are suitable for
    • Electroplating
    • Arc welding
    • Lighting
    • Battery charging

  58. When a BJT operates in cut off
    • VCE = VCC
    • VCE = 0
    • VCE = VCC / 2
    • VCE = 0.75 VCC

  59. In a BJT, β(Beta) =
    • (1-α)/α
    • (1+α)/α
    • α/(1+α)
    • α/(1-α)

  60. Efficiency of class A amplifier is
    • Between 50% – 60%
    • Less than 50%
    • Nearly 90%
    • Between 50% and 75%

  61. Mechanical equivalent of heat, J is
    • 36105 Joules
    • 4186 Joules/K Cal
    • 3186 Joules/Cal
    • 5186 Joules/K Cal

  62. 1 KWh = _________ Joules.
    • 3600
    • 36×103
    • 36×105
    • 36×106

  63. 1 Joule/second is equal to
    • 1 Watt
    • 1 Calorie
    • 1 Newton
    • 1 Henry

  64. 1 Coulomb of charge is defined as that charge which when placed in vacuum from equal and similar charge, repels it with a force of ________ N.
    • 9×109
    • 9×106
    • 9×10-9
    • 9×1018

  65. Dielectric strength of air in KV/mm
    • 2.1
    • 15
    • 3.2
    • 8.4

  66. Capacitor that stores a charge of 0.005 C at 10 volts has a capacitance of __________ Farad.
    • 0.05
    • 0.0005
    • 5×10-3
    • 5×10-6

  67. Unit of magnetic field strength (H) is
    • Newton/Weber
    • Ampere Turns
    • Weber
    • Henry

  68. MMF/Reluctance is equal to
    • Permeance
    • Field strength
    • Flux
    • Permeability

  69. Relative permeability, µr=
    • B2/H
    • H/B
    • B2H
    • Bmaterial/Bvacuum

  70. ____________ is used as electrolyte in Nickel-Iron battery.
    • H2SO4
    • HCl
    • MnO2
    • KOH

  71. Average emf of Edison cell is
    • 2.1 V/cell
    • 2.5 V/cell
    • 2.7 V/cell
    • 1.2 V/cell

  72. When three capacitors C1, C2 and C3 are connected in parallel, total capacitance will be
    • 1/C = 1/C1 + 1/C2 + 1/C3
    • C = 1/C1 + 1/C2 + 1/C3
    • C = C1 + C2 + C3
    • C =(C1 + C2 + C3)/(C1 C2 C3)

  73. ____________ammeter will be used to measure alternating current only.
    • Moving iron
    • Induction
    • PMMC
    • Electrodynamic

  74. Time period of 100 Hz alternating quantity is
    • 0.05 seconds
    • 0.02 seconds
    • 0.03 seconds
    • 0.01 seconds

  75. Average value  Form factor =
    • Peak value
    • Peak to peak value
    • Instantaneous value
    • rms value

  76. The critical value of loop gain of an oscillator, K Av is
    • Equal to 1
    • Less than 1
    • Greater than 1
    • Equal to 0

  77. Resonant frequency of an RLC series circuit
    • 1/(2π √(LC))
    • 1/(4π √(LC))
    • 1/√(2πLC)
    • 1/√(2π √(LR))

  78. LSI integrated circuits consists of ______________ transistors.
    • 10 to 100
    • 1 to 10
    • 100 to 1000
    • 50 to 500
    Question error

  79. Hexadecimal [23]16 = ____________
    • [23]10
    • [44]10
    • [35]10
    • [28]10

  80. Base of a transistor is _____________doped.
    • Heavily
    • Very lightly
    • Moderately
    • Not

  81. Which National Leader of India is known as ‘Prince of Workers’?
    • Sardar Vallabhbhai Patel
    • Lala Lajpath Roy
    • Bal Gangadhara Tilak
    • Gopal Krishna Ghokale

  82. Who is known as ‘Akbar of British India’?
    • Lord Wellesley
    • Lord Canning
    • Lord Hardinge
    • Lord Rippon

  83. Who was the first British Viceroy to visit Kerala?
    • Lord Lytton
    • Lord Wavell
    • Lord Curzon
    • Lord Mount Batten

  84. Which is the most abundant metal in the Earth’s crust?
    • Iron
    • Aluminium
    • Nickel
    • Silicon

  85. Who among the following is associated with the discovery of rings of Saturn?
    • Copper Nikos
    • Christian Hugguins
    • Galileo
    • Bhaskaracharya

  86. How many delegates had attended the first session of Indian National Congress?
    • 82
    • 72
    • 92
    • 98

  87. India changed over to the decimal system of coinage in
    • April 1957
    • April 1935
    • April 1950
    • April 1947

  88. Which country has the largest coastline?
    • USA
    • India
    • Australia
    • Canada

  89. The National Anthem was first sung in the year?
    • 1930
    • 1911
    • 1935
    • 1947

  90. Where is the Railway Staff College located?
    • Chennai
    • Bhopal
    • Pune
    • Vadodara

  91. Who was the author of the book ‘Story of an Escape’?
    • Surjith Singh Bernala
    • Nirupama Rao
    • Dr. M. S. Venkatesh
    • Dr. Ramesh Kumar Sharma

  92. India’s first Post Office Passport Seva Kendra (POPSK) has been inaugurated in which city?
    • Kochi
    • Bhopal
    • Mysuru
    • Chennai

  93. The World Hindi Day is observed on which date?
    • January 10
    • January 12
    • February 10
    • February 12

  94. Which Indian State has became the first to introduce cashless system for Public distributing system of food grains?
    • Sikkim
    • Gujarat
    • Madhya Pradesh
    • Punjab

  95. Which of the following State will host the 2022 National Games?
    • Karnataka
    • Rajasthan
    • Bihar
    • Meghalaya

  96. Who compiled ‘The Travancore State Manual’?
    • Munro
    • Mecaulay
    • V. Nagam Aiya
    • William Logan

  97. Who founded the ‘Vidya Poshini Sabha’?
    • Sahodharan Ayyappan
    • Swami Agamananda
    • Chattampi Swamikal
    • Vagbhadananda

  98. Who was called the ‘Simhala Simham’?
    • Ayyankali
    • Dr. Palpu
    • K. Kelappan
    • C. Kesavan

  99. Name the leader related to the ‘Muthukulam Speech’ of 1947.
    • Pattom Thanupillai
    • Mannthu Padmanabhan
    • V. T. Bhattathirippad
    • Pandit Karuppan

  100. In which year Sree Narayana Guru held an all religions conference at Advaithasramam Aluva?
    • 1922
    • 1914
    • 1924
    • 1918

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