1. Simple metod of increasing te voltage of a D.C. generator is:
Ans: Increase the speed of rotation
2. The existence of residual magnetism is not important if the D.C. generator is not connected as a:
Ans: Separately excited generator
3. The sodium vapor lamp operates in best efficiency at:
Ans:300 degree Celsius
4. Large value of air gap in an induction motor results in:
Ans: Providing better cooling
5. Which type capacitor is used for starting of a single phase motor:
Ans: Paper capacitor
6. An unbalanced system of three phase voltaes having RYB sequence actually consists of:
Ans: All of the above
7. Transformer oil serves the functions of:
Ans: Insulation and cooling
8. In scott connections the teuser transformer has tapping on:
Ans: 86% of primary
9. The line voltage of a delta-connected three-phase circuit is 415V. The phase voltage is:
Ans: 415V
10. To keep the frequency constant on increased loads the speed of the alternator should be:
Ans: Increased
11. The unit of solid angle is:
Ans: steradian
12. What is the temperature co-efficient value of aluminium ar 20 degree celsius:
Ans: 40.3*10-4
13. How to increase the current range of a meter:
Ans: A low resistance connected in parallel
14. One ampere-hour is equal to:
Ans: 3600 Coulombs
15. Unit of M.M.F. is:
Ans: Ampere turns
16. The starting winding is opened by a centrifugal switch when the motot has come up to about:
Ans: 75% of synchronous speed
17. Outer cage of squirrel cage motor is made up of:
Ans: brass
18. In star connection the supply voltage is reduced as:
Ans: y times
19. In the three-point starter the hold ON coil is connected in the:
Ans: field circuit
20. To magnetize steel is difficult because of its:
Ans: low permeability
21. A.H.P.M.V. lamp gives:
Ans: 50 lumens/watt
22. At the time of starting the sodium vapor lamp gives the colour of light is:
Ans: Reddish color
23. Centre tapping of the high voltage transformer must be earthed to:
Ans: Provide safety of operator
24. The possible minimum reading which can be taken by 0.25 m.m. of an outside micrometer is:
Ans: 0.01mm
25. The bending angle of the hard drawn bare copper conductor for britannia joint should be:
Ans: 90 degree
26. The most efficient form of damping employed in electrical instruments is:
Ans: eddy current
27. The reactance offered by a capacitor to alternating current of frequency of 50 Hz is 10 Ohm, if frequency is increased to 100Hz the reactance becomes------Ohm
Ans: 5 Ohm
28. Power factor of high speed motor compared to a low speed motor will be:
Ans: same
29. The normal size of circular sheet steel disc of an armature core of D.C. generator is:
Ans: 0.5mm
30. A 750 watts load is given to the three phase energy meter for 15 minutes and the meter constant is 1200 revolutions/KWH. Calculate the number of revolutions:
Ans: 200
31. Which of the following rule is used for find the direction of induced e.m.f.:
Ans: Fleming's right hand rule
32. The lifting power of a magnet is:
Ans: B2A/2Ho
33. Who discovered the neutron?
Ans: Chadwick
34. The voltage of a simple voltaic cell is:
Ans: 1.08v
35. The speed of electricity is:
Ans: None of the above
36. In soldering aluminium cables with a ferrule joint it is advisable to use:
Ans: a copper ferrule
37. The distance between clips in horizontal runs shall not exceed:
Ans: 10cm
38. For pipe earthing the minimum internal diameter of galvanized iron or steel pipe required is:
Ans: 18m.m.
39. According to I.E. rules the leakage current in an installation should not exceed one by----th part of the maximum current supplied to the installation.
Ans: 5000
40. The conductors of the armature windings are soldered at the commulator:
Ans: riser
41. A three phase 50 Hz induction motor has 8 poles and full load slip is 2.5% find rotor speed:
Ans: 731 RPM
42. Salient pole type rotor construction is usually provided in alternators used in:
Ans: Hydro power stations
43. Flow from a reciprocating pump will be:
Ans: pulsating
44. In practive earth is chosen as a place of zero potential because:
Ans: Has almost constant potential
45. Any charge given to the battery when taken off the vehicle is called:
Ans: Bench charge
46. What is the metal used to prevent the burning of the make and breke point of thermostal in an electric iron:
Ans: Brass
47. Maxwell-Wein bridge is used for measuring:
Ans: Inductance
48. The decibel is measure of:
Ans: Power level
49. Non-sinusoidal waveforms are made up of:
Ans: Different sinusoidal waveforms
50. There are no transients in pure resistive circuits because they:
Ans: They have no stored energy
51. Which type of M.C.B is used in air conditioners:
Ans: G series
52. Which type of fire extinguishers is used on electrical fire?
Ans: Halon type
53. Nichrome is widely used for:
Ans: heater coils
54. What is the di-electric strength in k.v./m.m. of asbestos at 20 degree celsius:
Ans: 42
55. Value of one kilowatt-hour is:
Ans: 3600000 Joules
56. The depolarizer is used in dry cell is:
Ans: MnO2
57. One Farad is equal to:
Ans: One Coulomb/volt
58. Two batteries each of open circuit voltage 2v and internal resistance of 2 Ohm are connected in parallel to supply a load of 2 Ohm, the current supplied by the battery is:
Ans: 1A
59. The density of the acid in lead acid battery gives of an indication of:
Ans: The level of the acid
60. The minimum insulation resistance of a water heater is:
Ans: 0.5 mega Ohm
61. A solenoid is defined as an electromagnet:
Ans: Having more axial length than diameter
62. Two watt meter method is used to measure the power in----load
Ans: Balanced and un-balanced load
63. Potential transformer and current transformer are:
Ans: Instrument transformer
64. Inter-poles are provided to:
Ans: improve commutation
65. Which of the following method is used to control the speed of shunt motor below than its rated speed:
Ans: armature control
66. When the generator is loaded:
Ans: Brushes are kept in MNA for sparkles commutaiton
67. A 24 Ohm and 8 Ohm resistors are in parallel have a combined resistance of:
Ans: 32 Ohm
68. The percentage of carbon in high speed steel is:
Ans: 0.75 to 1%
69. The control force employed in an indicating instrument, which can be kept in any position is:
Ans: Spring control
70. The deflecting control of a moving iron instrument is directly proportional to the:
Ans: Square of the current
71. No-load current of an introduction motor is approximately:
Ans: 30% of the full load current
72. Chatter in an A.C. relay magnet canbe eliminated using:
Ans: shading coil
73. Which kind of bearing is used wen a motor is to be mounted horizontally?
Ans: Radial
74. The rotor of a motor runs at 1410 R.P.M. and the synchronous speed is 1500 R.P.M. What is the slip of motor:
Ans: 6
75. Turbo alternators usually have:
Ans: 2 poles
76. I the meter constant mentioned in the meter is 1500 revolution/K.W.H in one revolution, the energy consumption is:
Ans: 40 watt-minutes
77. An unknown D.C. voltage is to be measured, which measuring range will you select first:
Ans: 500V
78. In three phase circuits the formula for calculating power factor by two wattmeter method is:
Ans: B
79. The resistance of the starting winding:
Ans: Is higher than the running winding
80. The purpose of te capacitor in a fan is to be:
Ans: give phase shift
81. The Wagon Tragedy of the Malabar rebellion took place in:
Ans: 10 November 1921
82. The 'Pattini Jatha' was organised by:
Ans: A.K.Gopalan and K.P.R.Gopalan
83. Who among the folloiwng is associated with 'Keezhariyur Bomb Case' of 1942:
Ans: K.B.Menon
84. Who among the following participated in Dandi March of 1930 with Mahatma Gandhi:
Ans: Krishnan Nair
85. The poem 'Jatikkummi' is written by:
Ans: Pandit Karuppan
86. The Constitution of India borrowed the idea of Directive Principle from:
Ans: Ireland
87. The Indian Constitution has been divided in to:
Ans: 22 chapters
88. Which of the following words were added to the preamble through an amendment in the Constitution carried out during emergency in 1976:
Ans: Socialist and Secular
89. The Panchayat Raj was introduces in India in:
Ans: 1959
90. Which one of the following subjects in the Concurrent list:
Ans: Criminal laws
91. Shortly before the general election in 1951, Dr. B.R.Ambedkar decide to contest te election under the banner of:
Ans: Scheduled Caste Federation
92. Name the military operation of Israel against Giza in 2014:
Ans: Operation protective edge
93. The Govt. of Tamil Nadu decided to celebrate APJ.AbdulKalam's birthday as:
Ans: Youth Renaissance Day
94. Who is known as'Mellisai Mannan':
Ans: M.S.Viswanathan
95. Christopher Lee is associated with:
Ans: Cinema
96. Who started CMS Press in 1821:
Ans: Benjamin Baily
97. The first Keralite wo has participated with the activities of Indian National Congress was:
Ans: G.P.Pillai
98. The famous play 'Pattabakki' was written by:
Ans: K.Damodaran
99. Who moved resolution requesting the Congress leadership to take the initiative to work for eradication ntouchability in Kerala at 'Kakinada' Sessionof 1923:
Ans: T.K.Madhavan
100. Ayyankali strted Sadhujana Paripalana Sangham in:
Ans: 1907
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