ELECTRICIAN AGRICULTURE(ERNAKULAM) 16/11/2016 SOLVED PAPER

ELECTRICIAN AGRICULTURE(ERNAKULAM)

EXAM DATE:16/11/2016
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1.Transformer core is laminated to---------

A.Reduce the copper loss

B.Reduces the eddy current loss*

C.Reduces the core loss

D.Hysteresis loss

Ans:B

2.Which type of loss is not common to transformer and rotating machines?

A.Eddy current loss

B.Copper loss

C.Hysteresis loss

D.Windage loss*

Ans:D

3.The difference between the synchronous speed and the actual speed of an induction motor is known as

A.Slip*

B.Regulation

C.Black lash

D.Lag

Ans:A

4.Three resistances of 30,15,5 ohms are connected in parallel,their combined resistance will be

A.Greater than 30 ohm

B.Between 30 to 15 ohm

C.Less than 5 ohm*

D.Between 15 to 5 ohm

Ans:C

5.Which of the following acts as a depolarizer in a dry cell?

A.Zinc chloride

B.Carbon powder

C.Ammonium chloride

D.Manganese dioxide*

Ans:D

6.Efficiency of a power transformer is of the order of

A.50%

B.75%

C.98%*

D.45%

Ans:C

7.The strongest dia-magnetic material

A.Sulphur

B.Bismuth*

C.Glass

D.Graphite

Ans:B

8.The magnitude of torque developed  by a three phase induction motor depends upon

A.Rotor current,rotor emf,rotor pf*

B.Supply voltage,stator current,frequency

C.Number of poles,speed,frequency

D.Synchronous speed,rotor speed,frequency

Ans:A

9.Rheostat method of speed control of induction motor is used in

A.Squirrel cage

B.Slip ring IM*

C.Double cage IM

D.All of the above

Ans:B

10.In a three phase IM the number of poles in the rotor winding are

A.Zero

B.Less than stator poles

C.Equal to stator poles*

D.More than stator poles

Ans:C

11.If the air gap of induction motor is increased

A.The magnetizing current will increase*

B.The pf will increase

C.Speed of the  motor will increase

D.Friction and windage loss will increases

Ans:A

12.Isolate fire from the supply of  oxygen  by blanketing it with foam,sand etc

A.Starving

B.Cooling

C.Spray water

D.Smothering*

Ans:D

13.What is the condition of ohm’s law?

A.Constant resistance

B.Constant voltage

C.Constant current

D.Constant temperature*

Ans:D

14.Power p=

A.Energy/time*

B.Energy/voltage

C.Current/voltage

D.Time/voltage

Ans:A

15.Moving cell instruments are use

A.AC only

B.Both AC/DC

C.DC only*

D.None of these

Ans:C

16.Low resistance means

A.Up to 10 ohm

B.1 Ohm and below*

C.1000 ohm

D.500 ohm

Ans:B

17.Unit of resistivity
A.Ohm*

B.Ohm-m

C.Ohm m2

D.Ohm/m

Ans:A

18.Kelvin bridge is used for measure:

A.Capacitance

B.Low resistance*

C.Inductance

D.Insulation resistance

Ans:B

19.Resistivity of eureka at 20oC

A.2.8x10-8

B.1.72x10-8

C.49x10-8*

D.20.2x10-8

Ans:C

20.Application of series parallel combination:
A.Current divider

B.Maximum resistance

C.Power divider

D.Voltage divider*

Ans:D

21.An earthing electrode usually made of:

A.PVC pipe

B.Carbon plate

C.Glass rod

D.Metal plate*

Ans:D

22.The color of protective conductor:

A.Green-yellow*

B.Green-red

C.Green-blue

D.Green-black

Ans:A

23.The color of middle wire of 3 wiere Dc circuit is:

A.Red

B.Black*

C.Blue

D.Green

Ans:B

24.Example of primary cell:

A.Lead acid cell

B.Edison cell

C.Voltaic cell*

D.Nickel-iron cell

Ans:C

25.The amp-hour efficiency of lead acid cell:

A.75%

B.90-95%*

C.80-85%

D.60-65%

Ans:B

26.High rate discharge tester consists of

A.Low range ammeter

B.High range voltmeter

C.Low range voltmeter*

D.High range ammeter

Ans:C

27.The color of fresh Silica gell is

A.Blue

B.Red

C.Black

D.Light pink color*

Ans:D

28.Imaginary line joining the two poles of a magnet

A.Magnetic equator*

B.Magnetic pole

C.Magnetic lines

D.Magnetic field

Ans:A

29.Rotor copper loss of a three phase induction motor is

A.Fractional slip x input power to the rotor*

B.Fractional slip x output of the rotor

C.Input power x output power

D.All the above

Ans:A

30.1 Metric horse power is:

A.742 W

B.735 W

C.735.6 W*

D.746 W

Ans:C

31.The back emf set up in the stator of a synchronous motor will depend on

A.Rotor speed only

B.Stator speed only

C.Rotor emf

D.Rotor excitation*

Ans:D

32.The armature Wdg of repulsion motor is excited:

A.Resistively

B.Inductively*

C.Conductively

D.Capacitively

Ans:B

33.The main disadvantage of shaded pole motor:

A.Low starting torque

B.Little over load capacity

C.Low efficiency

D.All the above*

Ans:D

34.The armature flux opposes the main flux is in synchronous machine when the PF is:

A.Unity*

B.Zero lagging

C.Zero leading

D.0.8 lagging

Ans:A

35.Dielectric strength of a medium is:

A.Joules/m²

B.Coulomb/m²

C.kV/mm*

D.Volt/m²

Ans:C

36.Electric intensity is expressed as:

A.Webber

B.Volt/m*

C.emf

D.Coulomb

Ans:B

37.Whenever two charges are separated there exist:

A.Magnetic field

B.Electric field

C.Electrostatic field

D.Emf*

Ans:D

38.Potential inside the hollow charged sphere:

A.Less than its surface

B.Greater than on its surface

C.Same as on its surface*

D.Zero

Ans:C

39.Capacitance in any circuit is opposition to:

A.Voltage*

B.Current flow

C.Any change in current

D.Any change in power

Ans:A

40.The simple measuring instrument used to transfer measurement from the steel rule to object

A.Try-square

B.Calliper*

C.Scriber

D.Punch

Ans:B

41.2 Ohm resistance having current of 2 A will dissipate the power of:

A.8 W

B.8 J

C.2 W

D.4 W*

Ans:D

42.If the diameter of a wire is doubled keeping the length constant the resistance:

A.Become one fourth*

B.Become twice

C.Remains same

D.Becomes 4 times

Ans:A

43.Which of the following is linear and bilateral element?

A.Semi conductor

B.Resistor*

C.Electron tube

D.Transistor

Ans:B

44.Why accumulators are preferred to pmy cell in motor car?

A.They are bulk

B.They have high internal resistance

C.They can be recharged*

D.All the above

Ans:C

45.Sedimentation occurs in lead acid cell to:

A.Over charging at high rate*

B.Over charging  at slow rating

C.No use for longer period

D.Slow charged rate

Ans:A

46.Kirchhoff’s law are valid for:

A.Linear circuit

B.Non linear circuit

C.Both linear and non-linear circuit*

D.Passive circuit

Ans:C

47.The algebraic sum of all IR drops and emf in any closed loop of a network as per KVL is:

A.+ve

B.Zero*

C.-ve

D.+ve or –ve

Ans:B

48.Form factor is the ratio of
A.Average value/rms value

B.Average value x rms value

C.Instaneous value/rms value

D.Rms value/average value*

Ans:D

49.The power factor of the inductive load is:

A.Leading

B.Lagging*
C.Unity

D.Zero

Ans:B

50.A choke coil has:

A.High inductive,high resistance

B.Low inductive,low resistance

C.Low inductive,high resistance

D.High inductive,low resistance*

Ans:D

51.A choke is used for limiting current in:

A.AC ckt only*

B.DC ckt only

C.Both AC and DC

D.Either AC or DC

Ans:A

52.Impedance at series resonance circuit:

A.Maximum

B.Average

C.Minimum*

D.All the above

Ans:C

53.Power factor is defined as:

A.kVA/kVAR

B.kVA/kW

C.kW/kVA*

D.kW/kVR

Ans:C

54.2 Wattmeter method measuring power,2 meters read equal and opposite reading the load power factor:

A.Zero*

B.0.5

C.Unity

D.Above 0.5

Ans:A

55.The secondary current of 400 KVA,11 KV/433 V,3 phase transformer is about:

A.420 A

B.533 A*

C.666.5A

D.840 A

Ans:B

56.The current rating of 400 mm2 AYFY cable is:

A.400A

B.435A

C.305A

D.335A*

Ans:D

57.The maximum efficiency of distribution transformer is:

A.1/4^th load

B.Full load

C.3/4^th load

D.Half road*

Ans:D

58.Unit of luminous intensity:

A.Lumen

B.Lux

C.Candela*

D.Lumen/m

Ans:C

59.The most efficient lamp:

A.Graphene*

B.LED

C.CFL

D.Sodium vapour lamp

Ans:A

60.The larger transformer stepped core arrangement is used to minimize the use of:

A.Core

B.Copper*

C.Hysteresis loss

D.Core loss

Ans:B

61.Examine the Commutator and brushes:

A.Weekly maintenance*

B.Monthly maintenance

C.Daily maintenance

D.Yearly  maintenance

Ans:A

62.In DC generator the voltage drop of copper carbon brush is about

A.1.6 V

B.2 V

C.1/75 V

D.0.3V*

Ans:D

63.Alternator voltage regulation is determined by emf method it is due to:

A.Rothert

B.Behn-Eschenberg*

C.Faraday

D.Pointer

Ans:B

64.The starting torque of capacitor start,capacitor run is about

A.200% of FL torque

B.50% of FL torque

C.300% of FL torque*

D.100% of FL torque

Ans:C

65.The first Director-General of Archaeological Survey of India:

A.Mountbatten

B.Alexander Cunningham*

C.Wheeler

D.Ernest Mackey

Ans:B

66.Name the first Indian to win the World Armateur Billard Title

A.Wilson Jones*

B.Kamaljit Sandhu

C.Ravi Shastri

D.K.Malleswari
Ans:A

67.In which place the Great Victoria Desert is located?

A.Canada

B.Africa

C.Asia

D.Australia*

Ans:D

68.Name the Kerala ruler who gave his country to Sri Padmanabha as Tripadidana

A.Saktan Thampuran

B.Swati-Tirunal

C.Marthanda Varma*

D.Rama Varma

Ans:C

69.Who was known as frontier Gandhi?

A.Abdul Kalam Azad

B.Muhammed Iqbal

C.Khan Abdul Ghafar Khan*

D.Patel

Ans:C

70.In which year Mountbatten Plan was announced in India?

A.1947*

B.1946

C.1945

D.1948

Ans:A

71.Director of the film ‘Tamas’explaining about partition of India:

A.Satyajit Rai

B.Govind Nihalani*

C.Mrinali Sen

D.Narain Bharati

Ans:B

72.In which year Sadhujana Paripalana Yogam established?

A.1903

B.1905

C.1907*

D.1910

Ans:C

73.Name the event which is related to Savarna Jatha

A.Shannar Agitation

B.Quit India Movement

C.Attingal Revolt

D.Vaikkom Satyagraha*

Ans:D

74.What is the name of spice which is called as ‘Yavanapriya’?

A.Ginger

B.Pepper*

C.Cinnamon

D.Cardamom

Ans:B

75.Who was the Viceroy of India during the time of Round Table Conferences?

A.Lord Canning

B.Ramsay Mac Donald

C.Lord Curzon

D.Lord Irvin*

Ans:D

76.The first person who offer Individual Satyagraha in Indian Freedom Movement?

A.Vinobha Bhave*

B.Dr.B.R.Ambedkar

C.Vallabhai Patel

D.Narendra Dutta

Ans:A

77.In which Year Historic Lahore session of Indian National Congress held?

A.1919

B.1929*

C.1930

D.1942

Ans:B

78.Which is the Name of Commission sent to India to enquire about the work of  Govt.of India Act of 1919?

A.Crips Mission

B.Wardha Commission

C.Simon Commission*

D.Cabinet Commission

Ans:C

79.Which is the birth place of Markuriakose Elias Chavara?

A.Bharanaganam

B.Mannanam

C.Mezhathur

D.Kainakari*
Ans:D

80.Pattanam was situated in the banks of river---------

A.Pamba

B.Bharatapuzha

C.Periyar*

D.Kurumalipuzha

Ans:C

81.The Yarkungzangbo river in India is known as----------

A.Brahmaputra*

B.Mahanadi

C.Kaveri

D.Sindhu

Ans:A

82.The Power to Prorogue the Lok Sabha rests with---------

A.Speaker

B.President*

C.Supreme Court

D.Prime Minister

Ans:B

83.Who is the Founder of Samatwa Samaj?

A.Chattampi Swamikal

B.Ayyankali

C.Vaghbhatananda

D.Vaikunda Swamikal*

Ans:D

84.The Political Guru of Mahatma Gandhi:

A.Gokhale*

B.Tilak

C.Surendra Nath Banerjee

D.Dadabhai Naoroji

Ans:A

85.Repulsion motor is provided with:

A.Commutator*

B.Centrifugal switch

C.Capacitor

D.Squirrel cage rotor

Ans:A

86.Whenever a poly phase motor is loaded the:

A.Induced emf in the rotor increases and its frequency falls

B.Induced emf in the rotor increases and its frequency rises*

C.Induced in the rotor remains constant

D.Induced emf in the rotor decreases and its frequency increases

Ans:B

87.For three resistance are connected in three phase,the power consumed will be more??-------connection

A.Star delta

B.Star

C.Delta*

D.Delta star

Ans:C

88.Synchronous motors run on leading power factor when connected in:

A.Under excitation

B.Rated excitation

C.Fully loaded

D.Over excitation*

Ans:D

89.The output voltage of a solar cell is approximately:

A.1.2 V

B.0.5 V*

C.2.1 V

D.3 V

Ans:B

90.Slip rings are generally made of:

A.Phosphoric bronze*

B.Alumini

C.Copper

D.Carbon

Ans:A

91.The hydrometer reading of fully charged lead acid battery:

A.1.2

B.1.5

C.1.11

D.1.26*

Ans:D

92.In induction motor percentage slip is maximum at:

A.Low speed

B.Medium speed

C.Stand still condition*

D.Synchronous speed

Ans:C

93.Economiser is a part of:

A.Hydel PS

B.Nuclear PS

C.Thermal PS*

D.Diesel PS

Ans:C

94.The crawling in an induction motor is caused by:

A.Improper design of the machine

B.Low voltage supply

C.High load

D.Harmonics developed in the motor*

Ans:D

95.The commutator segments are placed in:

A.Rotor*

B.Stator

C.Armature

D.Field

Ans:A

96.Reduction in the capacitance of capacitor start motor results in reduced:

A.Noise

B.Starting torque*

C.Speed

D.Armature reaction

Ans:B

97.In an ac circuit the ratio of kW/kVA represents:

A.Power factor*

B.Load factor

C.Starting torque

D.Diversity factor

Ans:A

98.The unit of inductance is:

A.OHM

B.MHO

C.HENRY*

D.FARAD

Ans:C

99.Ear to ear resistance of human body:

A.400

B.1 Kilo ohms

C.650 ohms

D.100 ohms*

Ans:D

100.Centrifugal switches is provided for disconnecting the auxiliary winding in a:

A.Capacitor run motor

B.Capacitor start motor*

C.Reluctance motor

D.Hysteresis motor

Ans:B