PSC EXAM ANSWER KEY JUNIOR INSTRUCTOR WIREMAN 19-08-2016

JUNIOR INSTRUCTOR(WIREMAN),INDUSTRIAL TRAINING

EXAM DATE:19-08-2016

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1.The value of one mega ohm is:

A.10³Ohm

B.10^-6Ohm

C.10⁶Ohm*

D.10^-3Ohm

Ans:C

2.Which of the following equation is correct according to Ohm’s law?

A.R=I/V

B.R=V/I*

C.I=R/V

D.V=R/I

Ans:B

3.Which meter is used to measure the power?

A.Power factor meter

B.Ammeter

C.Watt meter*

D.Multimeter

Ans:C

4.In a parallel circuit the total resistance is:

A.The sum of individual resistances

B.Equal to highest resistance value

C.More than the smallest resistance

D.Less than the smallest resistance of the combination*

Ans:D

5.If the area of cross section of a wire with a given length is doubled it’s resistance will:

A.Be doubled

B.Be halved*

C.Remain same

D.Be four times more

Ans:B

6.Head developed in a conductor is proportional to the:

A.Square of the power

B.Square of the time

C.Square of the current*

D.Square of the resistance

Ans:C

7.Which of the following has negative temperature coefficient of resistance?

A.Copper

B.Aluminium

C.Gold

D.Carbon*

Ans:D

8.A substance that has low retentivity cannot be used for the manufacturer of:

A.Electro magnet

B.Permanent magnet*

C.Temporary magnet

D.Paramagnets

Ans:B

9.The initial function of a choke in a tube light circuit is to:

A.Limit the starting current

B.Heat up the filament

C.Induce high voltage*

D.Keep the voltage same

Ans:C

10.Which one of the following is unit of inductance?

A.Henry*

B.Mho

C.Ohm

D.Kwh

Ans:A

11.The formulae for calculating power in R.L.Circuit is:

A.Vx1

B.I²Z

C.VICos(Theta)*

D.VISin(Theta)

Ans:C

12.If the frequency changes from 50Hz to 100Hz keeping voltage constant,the inductive reactance of the coil connected to supply:

A.Remains same

B.Become doubled*

C.Become half

D.Become four times

Ans:B

13.In a capacitive AC circuit the:

A.Current leads the voltage*

B.Voltage leads current

C.Current and voltage in phase

D.Current lags voltage

Ans:A

14.The power factor of an AC circuit is given by:

A.Cosine of the phase angle*

B.Tangent of the phase angle

C.The ratio of R/X

D.The ratio of XL/Z

Ans:A

15.The capacity of a cell is measured in:

A.Watt-hour

B.Watts

C.Amperes

D.Ampere-hour*

Ans:D

16.In a 3 phase star connected balanced load,the current in the neutral wire is:

A.21 ph

B.31 L

C.Zero*

D.IL

Ans:C

17.In a 3 phase Delta connected circuit:

A.The line voltage is equal to phase voltage*

B.The line voltage is equal to Square root of 3 phase voltage

C.The line voltage is equal to Phase voltage/Square root of 3

D.The line voltage is equal to zero

Ans:A

18.The meter installed at your house to measure electrical energy is an example of:

A.Indicating type instrument

B.Recording type instrument

C.Indicating as well as recording type instrument

D.Integrating type instrument*

Ans:D

19.Dynamo meter type instruments are used to measure:

A.Only AC quantities

B.Both AC and DC*

C.DC only

D.AC only

Ans:B

20.The unit of commercial electrical energy is measured in:

A.KW

B.KVA

C.KWH*

D.Volt ampere

Ans:C

21.When the disc of an energy meter is rotating even without connecting any load,the error is called?

A.Creeping error*

B.Phase error

C.Friction error

D.Temperature error

Ans:A

22.An electrical circuit that has infinity resistance shown in megger is called a ---------

A.An open*

B.Short

C.A ground

D.Closed

Ans:A

23.For pipe earthing the minimum  internal diameter of galvanized iron or steel pipe required is:

A.12.5 mm

B.16 mm

C.18 mm

D.38 mm*

Ans:D

24.The heat proof insulating material used for heater base is:

A.Mica

B.Porcelain*

C.Asbestos

D.Glass wool

Ans:B

25.The thermostat in an automatic electric iron will:

A.Reduce the current to control temperature

B.Change the current flow through element

C.Regulate the heat by switching ON-OFF*

D.Switch ON and OFF the indicating lamp

Ans:C

26.What type of motor is used in a food mixer?

A.DC shunt motor

B.Universal motor*

C.Capacitor start motor

D.Permanent capacitor

Ans:B

27.If the voltage applied at the terminals of 230V single phase 1200 mm sweep ceiling fan is 120 V then the fan:

A.Will not run

B.Will run at normal speed

C.Will be heated

D.Will run slowly*

Ans:D
28.The sweep of the ceiling fan is determined by:

A.Length of the blade from fan centre

B.The diameter of the circle formed by the blade tips of the fan*

C.Breadth of the blades

D.The distance between adjacent blade tips

Ans:B

29.The unit of luminous intensity is:
A.Candela*

B.Steradian

C.Lux

D.Lumen

Ans:A

30.The potential difference that causes the break down of insulation is called:

A.Dielectric strength

B.Insulation resistance

C.Break down voltage*

D.Ampacity

Ans:C

31.The possible minimum reading which can be taken by 0.25 mm out side micrometer is:

A.0.1 mm

B.0.5 mm

C.1 mm

D.0.01 mm*

Ans:D

32.Britannia joint is used in:

A.Under ground cables

B.Conduct wiring

C.Concealed wiring

D.OH Lines*

Ans:D

33.Soldering is done on joints to improve:

A.Tensile strength

B.Resistivity

C.Conductivity*

D.Ductility

Ans:C

34.Switch board is fixed at a height of:

A.2 meters

B.1.5 meters*

C.2.5 meters

D.2.75 meters

Ans:B

35.The load on each power sub circuit shall be restricted to:

A.5000 W

B.500 W

C.3000 W*

D.1000 W

Ans:C

36.The number of light points admissible in a circuit is:

A.10 points*

B.15 points

C.4 points

D.20 points

Ans:A

37.A fuse rating is expressed in terms of:

A.Voltage

B.Current*

C.KVA

D.VAR

Ans:B

38.Fusing factor of HRC fuses will be:

A.1.4

B.1.6

C.1.1*

D.1.7

Ans:C

39.In which of the following wiring,to operate three lamps in all we require six,two way switches?

A.Godown wiring

B.Tunnel wiring

C.Corridor wiring*

D.Hostel wiring

Ans:C

40.Fleming’s right hand rule is used to identify the:

A.Direction of flux

B.Direction of induced e.m.f*

C.Direction of current in a motor

D.Magnetic flux

Ans:B

41.The armature core is laminated to minimize the:

A.Iron loss

B.Eddy current loss*

C.Hysteresis loss

D.Friction loss

Ans:B

42.ADC generator works on the principle of:
A.Farady’s law of electro magnetic induction *

B.Faraday’s laws of electrolysis

C.Mutual induction

D.Fleming’s left hand rule

Ans:A

43.In an 8 pole simplex wave winding armature,the number of parallel paths are:

A.4

B.8

C.6

D.2*

Ans:D

44.In a 250 V.D.C Machine,shunt field resistance is found to be 500 ohms.The shunt field current will be:

A.2A

B.0.2 A

B.5 A

D.0.5 A*

Ans:D

45.The current in the armature of a D.C.Shunt generator can be determined by the formulae:

A.V-E/Ra

B.Eb/Ra

C.IL+I sh*

D.IL-I sh

Ans:C

46.Which one of the following generator is used for charging batteries with constant voltage?

A.Compound generator

B.Series generator

C.Alternator

D.Shunt generator*

Ans:D

47.The direction frotation of a DC motor is determined by:

A.Fleming’s right hand rule

B.Fleming’s left hand rule*

C.Right hand grip rule

D.Maxwell’s cork screw rule

Ans:B

48.The back e.m.f of a D. C Motor depends on:

A.Shape of conductors

B.Field flux*

C.Type of commutator

D.Brush material

Ans:B

49.The main function of starter of the DC Motor is to:

A.Limit the starting current*

B.Limit the back e.m.f

C.Increase the field circuit resistance

D.Decrease armature resistance

Ans:A

50.The speed of DC shunt motor has to be controlled through the field,the most suitable starter for this purpose is:

A.D.O.L Starter

B.2 Point starter

C.3 point starter

D.4 point starter*

Ans:D

51.The speed of a DC motor is:

A.Directly proportional to the back e.m.f and inversely proportional to the flux*

B.Inversely proportional to back e.m.f.and directly proportional to flux

C.Directly proportional to the e.m.f as well as the flux

D.Directly proportional to current

Ans:A

52.Insulation resistance is measured in:

A.Mega Watts

B.Kilo ohms

C.Mega ohms*

D.Kilo volts

Ans:C

53.The running speed of a 3 phase squirrel cage induction motor is:

A.Synchronous speed

B.More than synchronous

C.Double synchronous speed

D.Less than synchronous speed*

Ans:D

54.For 3 HP,3 phase 415 V,50 Hz squirrel cage induction motor started through a D.O.L starter,the back up fuse rating will be:

A.15 Amps*

B.10 Amps

C.6 Amps

D.4 Amps

Ans:A

55.When remote ‘ON’and ‘OFF’ are used in a D.O.L starter,the remote ‘ON’button should be connected with the existing ‘ON’button in:

A.Series

B.Series and parallel

C.Bridge circuit

D.Parallel*

Ans:D

56.When a 3 phase induction motor is switched to star position through a star delta starter:

A.Square root of 3 times the torque produced than the delta position

B.3 times torque produced  than the delta position

C.1/Square root of 3 times the torque produced than the delta position

D.1/3 times torque produced than the delta position*

Ans:D

57.In a manual star delta starter,the stop button connection is in series with the:

A.No volt coil

B.Over load relay contact

C.No volt coil and overload relay contacts*

D.No volt coil and start button

Ans:C

58.A High starting torque is obtained in a slip ring induction motor by using a:

A.Rotor rheostat starter*

B.Star delta starter

C.4 point starter

D.D.O.L Starter

Ans:A

59.We can identify a wound rotor induction motor by seeing:

A.Direction of rotation

B.Slip rings*

C.Six terminals

D.Size of machine

Ans:B

60.A poly phase induction motor is usually:

A.Self starting*

B.Slow starting

C.Not self starting

D.High starting

Ans:A

61.For ceiling fan generally which type of motor is used?

A.Split phase

B.Capacitor

C.Permanent capacitor*

D.Universal motor

Ans:C

62.The maximum efficiency of transformer is obtained when:

A.Copper loss is maximum

B.Copper loss is equal to iron loss*

C.Iron loss is maximum

D.Running without loss

Ans:B

63.Buchhol’s relay is a device related with:

A.Alternator

B.Synchronous motor

C.Auto transformer

D.Transformer*

Ans:D

64.Auto transformer works on  the principle of:

A.Mutual induction

B.Self induction*

C.Self induction

D.Electron fusion

Ans:B

65.Which one of the following,is the e.m.f equation of transformer?

A.EP/ES=IP/IS=VS/VP

B.E=4.44(phi)mfN Volts*

C.E=(phi)ZNP/6(phi)xA

D.V=IxR

Ans:B

66.The main source of hydro electric power station is:

A.Water*

B.Coal

C.Nuclear

D.Diesel

Ans:A

67.Which insulator is used on dead ends of medium voltage line?

A.Egg Type

B.Pin Type

C.Shackle type*

D.Disc type

Ans:C

68.Which type of guarding is provided on a railway line crossing?

A.Cage type*

B.Cradle type

C.Bird type

D.Bead type

Ans:A

69.In a transmission line which type of insulators are used:

A.Pin type

B.Shackle type

C.Egg type

D.Suspension type*

Ans:D

70.MCCB stands for:

A.Metal Close Circuit Breaker

B.Main Current circuit Breaker

C.Moulded Case Circuit Breaker*

D.Miniature Circuit Breaker

Ans:C

71.For a given line current and line voltage the power taken by the delta connected load is--------the power taken by the star connectd load

A.More than

B.Less than

C.Equal to*

D.No comparison to

Ans:C

72.The series type Ohm meter will have zero reading at the:

A.Centre of the scale

B.Left hand end of scale

C.Anywhere in meter

D.Right hand end of scale*

Ans:D

73.To charge a secondary cell,the system used is:

A.Low Voltage AC

B.DC*

C.High Voltage AC

D.AC

Ans:B

74.The approximate full load current of a 3 phase delta connected 3 HP motor is:

A.4.5 Amps*

B.3.5 Amps

C.2.5 Amps

D.10 Amps

Ans:A

75.The total opposition offered by an C circuit is called:

A.Inductive reactance

B.Resistance

C.Capacitive reactance

D.Impedance*

Ans:D

76.Which one of the following fire extinguish is suitable for electrical fire?
A.Halon*

B.Water

C.Foam

D.Liquefied chemical

Ans:A

77.The least count of steel rule is:

A.1 mm

B.0.5 mm*

C.1 cm

D.0.1 mm

Ans:B

78.Rawl plug tool and bit is used for:

A.Making holes in wood

B.Making piolet holes in wood

C.Making holes in metal sheets

D.Making holes in bricks and concrete wall*

Ans:D

79.In an atom the number of proton is:

A.Equal to the number of electrons*

B.Equal to the neutron

C.Equal to the nucleus

D.Equal to zero

Ans:A

80.The flow of electrons is called:
A.Current*

B.Voltage

C.Resistance

D.Inductance

Ans:A

81.One of the prominent families among the Church Mission Society missionaries in Central Travancore was:

A.Henry Baker family*

B.Mead family

C.Ringletaube family

D.Dawson family

Ans:A

82.Name the Titles received by K.P.Karuppan,famous social reformer and poet of Kerala,from Valiya Tampuran of Cochin?

A.Kavirajan and Sahi tyasreshtan

B.Mahakavi and Sahi tyadeepam

C.Kavitilakan and Sahit yanipunan*

D.Kavanakaumudi and Mahopadhyaya

Ans:C

83.One of the early detective  novels in Kerala titles “Kaalante Kolayara”was written by:

A.O.M.Cheriyan*

B.Appan Thamapuran

C.Kesari Balakrishna Pillai

D.Joseph Pitt

Ans:A

84.Who was the first editor of “Samadarsi”?

A.K.Ramakrishna Pillai

B.Kandathil Varghese Mappila

C.Kunnath Janardhana Menon*

D.A.Balakrishna Pillai

Ans:C

85.”Ente Vazhithirivu”is the autobiography of:

A.Kesava Dev

B.G.Sankara Kurup

C.Thakazhi

D.Ponkunnam Varkey*

Ans:D

86.”Vaala samudaya parishkarana sabha”was formed in the year:

A.1910*

B.1912

C.1916

D.1918

Ans:A

87.Who among the following women activists of Kerala took part in the general strike,led by Tiruvitamkur Coir Factory Workers Union(TCFWU)at Alappuzha in 1938?

A.Parvathi Nenminim angalam

B.Arya Pallam*

C.Lalitha Prabhu

D.Anna Chandy

Ans:B

88.What event occurred in 20^th August 1921 that became the prime catalyst of Malabar Rebellion?

A.Arresty of V.Mammed,a local Khilafat worker,by the British police

B.The siege of Tirurangadi Mosque by the British army and police*

C.The visit of Mahatma Gandhiji and  Shoukath Ali to Malabar

D.Ottappalam Political Conference

Ans:B

89.Name the magazine that founded and edited by Anna Chandi for promoting the cause of women’s rights?

A.Streesabdam

B.Vanithakusumam

C.Sumangala

D.Shrimati*

Ans:D

90.Who authored the book “Vaikom Satyagraha and Gandhiji”?

A.Dr.K.N.Ganesh

B.K.N.Panikkar

C.Dr.T.K.Ravindran*

D.Dr.M.G.S.Naryanan

Ans:C

91.The Sutlej-Yamuna Link Canal(Syi)controversy is associated with the states between:

A.Delhi and Uttar Pradesh

B.Punjab and Haryana*

C.Uttar Pradesh and Bihar

D.Uttar Pradesh and Uttarakhand

Ans:B

92.Sadiq Khan,who had been a historic Win while he elected as London’s first etnic-minority Mayor in the 2016 elections,represents which Political Party?

A.Labour Party*

B.Liberal Party

C.Conservative party

D.Republican Party

Ans:A

93.Kuramadera Buddhist Temple is located in:

A.Kyoto*

B.Nara

C.Tokyo

D.Beijing

Ans:A

94.What is Catoptrophobia?

A.Fear of Accidents

B.Fear of Electricity

C.Fear of Cattles

D.Fear of Mirrors*

Ans:D

95.Expand VVPAT

A.Voter Verifiable Paper Account Trail

B.Voter Verifiable Paper Audit Trail*

C.Voter Verifiable Print Account Trail

D.Voter Verifiable Paper Audit Test

Ans:B

96.The Constituent Assembly of India began its Third Session on:

A.9^th December 1946

B.11^th December 1946

C.28^th April 1947*

D.26^th May 1947

Ans:C

97.Which Article of Indian Constitution mentions about the State responsibility to promote educational and economic interests of the tribal people?

A.Article 17

B.Article 46*

C.Article 15(2)

D.Article 31(B)

Ans:B

98.Which social reformer of Kerala started an Agricultural Bank namely “Uralunkal Aikyananya Sangham”?

A.Sree Narayana Guru

B.Brahmananda Sivayogi

C.Sahodaran Ayyappan

D.Vagbhadananda*

Ans:D

99.In which year the ‘second ezhava memorial’was presented by the leaders of Ezzhava community before Lord Curzon,then the Viceroy of India,during his visit to Thiruvanathapuram?

A.1898

B.1896

C.1900*

D.1903

Ans:C

100.The active participation of which struggle in modern Kerala History gave G.Parameswarn Pillai the epithet of “Gather of Political movements in modern Travancore?”

A.Struggle against untouchability

B.Electricity agitation

C.Nivarthana agitation

D.Struggle against appointing non-travanc oreans to State services*

Ans:D