November 2021 ~ PSC SOLVED QUESTIONS

ELECTRICIAN - AGRICULTURE--------------2016

Paper Code:- 152/2016 Date Of Test:- 16.11.2016

1. Repulsion motor is provided with:

(A) Comnuitator (B) Centrifugal switch

2. 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

(D) induced emf in the rotor decreases and its frequency increases

3. For three resistance are connected in three phase, the power consumed will be more in

connection.

(A) star delta (B) star (C) delta (D) delta -star

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

(A) under excitation (B) rated excitation

5. The out put voltage of a solar cell is approximately:

(A) 1.2 V (B) 0.5 V (C) 2.1 V (D) 3V

6. Slip rings are generally made of;

(A) phosphor bronze (B) aluminum

7. The hydrometer reading of fully charged lead acid battery;

(A) 1.2 (13) 1.5 (C) 1.11 (D) 1.26

8. In induction motor percentage slip is Maximum at:

(A) low speed (B) medium speed

9. Economiser is a part of:

(A) hydel PS (B) nuclear PS (C) thermal PS (D) diesel PS

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

(A) improper design of the machine (B) low voltage supply

11. The commutator segments are placed in:

(A) rotor (B) stator (C) armature (D) field

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

(A) noise (B) starting torque

13. In an ac circuit the ratio of klV/kVA represents:

(A) power factor (B) load factor (C) starting torque (D) diversity factor

14. The unit of inductance is:

(A) OHM (13) MHO (C) HENRY (D) FARAD

15. Ear to ear resistance of human body:

(A) 400 (13) 1 kilo ohms (C) 650 ohms (I)) 100 ohms

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

(A) capacitor run motor (B) capacitor start motor

17. Transformer core is laminated to:

(A) reduce the copper loss (13) reduces the eddy current loss

18. Which type of loss is not common to transformer and rotating machines 7

(A) eddy current loss (B) copper loss

19. 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

20. Three resistances of 30, 15, 5, ohms are connected th parallel, their combined resistance will

be:

(A) greater than 30 ohm (11) between 30 to 15 ohm

21. Which of the following acts as a depolarizer M a dry cell?

(A) zinc chloride (B) carbon powder

22. Efficiency of a power transformer is of the order of:

(A) 50% (B) 7500 (C) 98% (0) 45%

23. The strongest diet -magnetic material:

(A) sulphur (B) bismuth (C) glass (13) graphite

24. 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

(D) synchronous speed, rotor speed, frequency

25. Rheostat method of speed control of induction motor is used In:

(A) squirrel cage LM (B) slip ring INI (C) double cage

at (D) all of the above

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

(A) zero (B) less than stator poles

A 5 152/2016

27. If the air gap of induction motor is increased:

(A) the magnetizing current will increase

(B) the pi will increase

(D) friction and windage loss will increases

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

(A) starving (B) cooling (C) spray water (D) smothering

29. What is the condition of ohm's law ?

(A) constant resistance (B) constant voltage

30. Power pa

(A) energy/time (B) energy/voltage (C) current/voltage (D) time/voltage

31. Moving coil instruments are use:

(A) ac only (B) both ac/dc (C) tic only (D) none of these

32. Low resistance means:

(A) up to 10 ohm (B) 1 ohm and below

33. Unit of resistivity:

(A) ohm (B) ohm -m (C) ohm m 2 (D) ohm/m

34. Kelvin bridge is used for measure:

(A) capacitance (B) low resistance

35. Resistivity of eureka at 211'C:

(A) 2.8 x 10-8 (B) 1.72 x 10-8 (C) 49 x 10-8 (D) 20.2 x 10 -8

36. Application of series parallel combination:

(A) current divider (B) maximum resistance

37. An earthing electrode usually made of :

(A) PVC pipe (B) carbon plate (C) glass rod (D) metal plate

38. The color of protective conductor:

(A) green- yellow (B) green - red (C) green - blue (D) green - black

39. The color of middle wire of 3 wire DC circuit is:

(A) red (B) black (C) blue (D) green

40. Example of primary cell:

(A) Lead acid cell (B) Edison cell (C) Voltaic cell (D) Nickel - iron cell

41. The amp -how efficiency of lead acid cell :

(A) 750 (B) 90 - 95% (C) KO - 85% (D) 60 - 65%

42. High rate discharge tester consists of:

(A) low range ammeter (B) high range voltmeter

43. The color of fresh Silica gull is:

(A) Blue (B) Red (C) Black (D) Light pink color

44. Imaginary line joining the two poles of a magnet:

(A) magnetic equator (B) magnetic pole

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45. 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

(I)) AU the above

46. 1 Metric horse power is:

(A) 742 W (B) 735 W (C) 735.6 W (D) 746 W

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

(A) rotor speed only (B) stator speed only

48. The armature 1Vcig of repulsion motor is excited:

(A) resistively (B) inductively (C) conductively (D) capacitively

49. The main disadvantage of shaded pole motor:

(A) low starting torque (B) little over load capacity

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

(A) unity (13) zero lagging (C) zero leading (D) 0.8 lagging

51. Dielectric strength of a medium is:

(A) Joules/m2 (B) Coulomb/ m2 (C) kV/ mm (D) Volt/m 2

52- Electric intensity is expressed as:

(A) welter (B) Volt/m (C) einf (D) coulomb

53. Whenever two charges are separated there exist:

(A) magnetic field (B) electric field

54. Potential inside the hollow charged sphere:

(A) less than its surface (B) greater than on its surface

55. Capacitance in any circuit is opposition to:

(A) voltage (B) current flow

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

object:

(A) try -square (B) calliper (C) scriber (D) punch

57. 2 ohm resistance having current of 2 A will dissipate the power of:

(A) SW (B) 81 (C) 2W (D) 4W

58. li the diameter of a wire is doubled keeping the length constant the resistance:

(A) becomes one fourth (B) become twice

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

(A) Semiconductor (B) resistor (C) electron tube (D) transistor

60. Why accumulators are preferred to piny cell in motor car?

(A) they are bulk (B) they have high internal resistance

61. Sedimentation occurs in lead acid cell to:

(A) over charging at high rate (B) over charging at slow rating

62. Kirchhoff's law are valid for :

(A) linear circuit (B) non-linear circuit

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

(A) + ve (B) zero (C) —Ye (D) +ve or —ve

64. Form factor is the ratio of:

(A) average value/nns value (B) average value x tins value

63. The power factor of the inductive load is:

(A) leading (F) lagging (C) unity (D) zero

66. A choke coil has:

(A) high inductive, high resistance (B) low inductive, low resistance

67. A choke is used for limiting current in:

(A) AC ckt only (B) DC ckt only

68. Impedance at series resonance circuit:

(A) maximum (B) average (C) minimum (D) all the above

69. Power factor is defined as:

(A) kVA/kVAR (B) kVA/kW (C) kW/kVA (D) kW/kVR

70. 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

71. The secondary current of 400 kVA, 11kV/433V, 3 phase transformer is about:

(A) 420 A (B) 533 A (C) 666.5 A (D) 840 A

72. The current rating of 400 min2 AYFY cable is:

(A) 400A (B) 435A (C) 305A (D) 335A

73. The maximum efficiency of distribution transformer is:

(A) 1/4th load (B) fun load (C) 3/4Ih load (D) half load

74. Unit of luminous intensity:

(A) lumen (B) lux (C) candela (0) lumen/m

75. The most efficient lamp:

(A) graphene (B) LED

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

(A) core (B) copper (C) hysteresis loss (D) core loss

77. Examine the Commutator and brushes:

(A) weekly maintenance ( 3) monthly maintenance

78. In DC generator the voltage drop of copper -carbon brush is about:

(A) 1.6 V (B) 2 V (C) 1.75 V (D) 0.3 V

79. Alternator voltage regulation is determined by emf method. It is due to:

(A) Rothert (B) Behn-Eschenberg

80. The starting torque of capacitor start, capacitor run is about:

(A) 200% of FL torque (B) 50% of FL torque

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81. The first Director General of Archaeological Survey of India :

(A) Mountbatten (B) Alexander Cunningham

82. Name the first Indian to win the World Amateur Billiards Title.

(A) Wilson Jones (B) Kamaljit Sandhu

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

(A) Canada (B) Africa (C) Asia (D) Australia

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

(A) Satan Tampuran (B) Swati Tirunal

85. Who was known as Frontier Gandhi?

(A) Abdul Kalam And (B) NIuhammed Ighal

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

87. Director of the film 'Tams" explaining about partition of India:

(A) Satyajit Rai (B) Govind Nihalani

88. In which year Sadhujanaparipalanayogam established ?

89. Name the event which is related to Savona Jatha.

(A) Shartar Agitation (B) Quit India Movement

90. What is the name of spice which is called as "Yavanapriya" ?

(A) Ginger (B) Pepper (C) Cinnamon (D) Cardamom

91. Who was the Vicemy of India during the time of Round Table Conferences?

(A) Lord Canning (B) Ramsay Mac Donald

92. The First person who offer Irian, idual Satyagraha in Indian Freedom Movement:

(A) Vinobha Bhave (B) Dr. B.R. Ambedkar

93. In Which Year Historic Lahore session of Indian National Congress held?

94. Which is the Name of Commission sent to India to enquire about the work of Govt. of India

Act of 1919?

(A) Cups Mission (B) Wardha Commission

95. Which is the birth place of Mar Kuriakose Eliias Chavara ?

(A) Bharanaganm (B) Mannanant (C) Mezhathur (D) Kainakari

96. Pattanam was situated in the banks of river

(B) Bharataputha (C) Periyar (D) Kurumali puzha (A) Pamba

97. The Yarkungzangbo river in India is known as

(A) Brahmaputra (B) Mahanadi (C) Kaveri (D) Sindhu

98. The Power to Prorogue the Lok Sabha rests with

(A) Speaker (B) President (C) Supreme Court (D) Prime minister

99. Who is the Founder of Samatwa Samaj ?

(A) Chattampi swatnikal (II) Ayyankali

100. The Political Gum of Mahatma Gandhi:

(A) Gokhale (B) Tilak

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ASSISTANT ENGINEER - DIRECT/BY TRANSFER - KERALA WATER AUTHORITY-----2016

Paper Code:- 28/2016 Date Of Test:-13.02.2016

Maximum: 100 marks

Time: 1 hour and 15 minutes

1. A triangle lamina having a base 1 in and height 1.5 in is placed vertically under water with

the base parallel to the water surface and the base below 3 m of water. The total force

exerted on one face is:

(A) 18.394 kN (B) 18.394 kg

2. If the velocity potential function is given by = 3x — 4y, find the magnitude and direction of

velocity at any point:

(A) 4.87 m/s, 450 (B) 5 m/s, 38° 3'

3. A jet of water 40 mm in diameter has a velocity of 25 m/s. Find the power of the jet:

(A) 10.81 kW (B) 9.82 kW

4. Find the bed slope 'i' of a wide rectangular channel so that the flow to reach a given critical

depth d, and Manning's coefficient n:

(A) i (B) i =—

. gn2

d"3

5. The discharge available from a tube well is 120 mi/hr. Assuming 3200 h of working of the

tube well for a year, the intensity of irrigation as 50% and average depth of Rabi and Kharif

crop as 48 cm, the culturable area that this tube well can command is:

(A) 160 ha (B) 172 ha

6. Lacey's formula for fixation of water way is:

(A) V ..0.55 y°54 (B) 4.75/

10 Q = KAI (D) Q =, AV

7. An offset is laid out 2° from its true direction on the field. If the scale of plotting is 10 in to

1 cm, find the maximum length of the offset so that the displacement of the point on the

paper may not exceed 0.25 mm?

(A) 5.0 m (B) 6.12 m

8. The following perpendicular offsets were taken at 10 m intervals from a survey line to an

irregular boundary line: 3.25, 5.6, 4.2, 6.65, 8.75, 6.2, 3.25,4.2, 5.65. Calculate the area by trapezoidal rule

(A) 433 m2 (B) 439.67 m2

9. A square footing 2.5 m x 2.5 in is built in a homogeneous bed of sand of unit weight 20 kN/ni 3

and having an angle of shearing resistance of 36°. The depth of the base of the footing is

1.5 in below the ground surface. Calculate the safe load that can be carried by a footing with

a factor of safety 3 against complete shear failure?

Bearing capacity factors N, = 65.4, N g = 49.4 and N, 54.0

(A) 4325 kN (B) 4927.5 kN

10. Hydrophobic cement is obtained by grinding ordinary Portland cement clinker with:

(A) Hydrochloric acid (B) Oleic acid

11. How much initial slump is required for a concrete mix to he fluidised by plasticizers or super

plasticizers?

(A) 2 to 3 cm (B) 2 to 3 mm

12. ISO: 800-2007 limits the va lues of width- thickness ratios of the elements of a steel section to

place a check on:

(A) Bending buckling (B) Torsional buckling

13. The shape factor of a square of side 'a' with its diagonal parallel to the ZZ axis is :

(A) 2 (B) 1.7

14. Strength of a 20 mm diameter bolt of grade 4.6 for a single cover butt joint. The cover plate

being 10 mm thick. Assume steel of grade Fe 410, f„ = 410 MPa, for bolts of grade 4.6,

= 400 MPa, Partial safety factor for the material of the bolt y„, t , = 1.25 and net tensile

stress area of 20 mm diameter bolt A„b = 245 mm2, le; =0.5 in single shear is:

(A) 80 kN (B). 45.26 kN

15. Minimum grade of concrete mix used for water retaining structures with alternate wetting

and drying:

(A) M20 (B) M25

16. A hook 12 mm diameter is embedded in concrete for a distance of 100 mm. Calculate the

maximum load which the hook can carry if the bond stress is not to exceed 1.28 N/mm 2:

(A) 5100N (B) 415N

17. Year's purchase for an old building if its future life is 15 years and the rate of interest is 7%

on capital and 4% for sinking fund:

(A) 8.333 • (B) 9.231

18. A beam of span / carries a concentrated load P at mid span. Work done by the external load

Is:

P213 p218

(A) (111

48 El 96 E1

1,13 (C) (D)

96 El 48 E1

19. A three hinged arch of span 20 m and rise 4 m carries a uniformly distributed load of

25 kN/m. Horizontal thrust is:

(A) 250 kN (B) 600 kN

20. Find the shortest length L for a pin ended steel column having a cross section of

60 ram x100 nim for which Euler's formula applies. Take Es 2 x 10$N/mm2 and critical

proportional limit is 250 N/mm 2: •

(A) 6000 mm (B) 2500 mm

21. Which method of analysis of water distribution system is most suitable for long and narrow

pipe system?

(A) Circle method (B) Hardy Cross Method

22. For disinfecting water supply, it is required to treat 5,00,000 litres of daily supply with

0.5 ppm of chlorine. If the disinfectant is available in the form of bleaching powder containing

30% of available chlorine, the amount of bleaching powder required to treat the, daily flow of

water is:

(A) 0.833 kg (B). 0.916 kg

23. In water treatment settling unit, water having a temperature of 20 Degree Centigrade

carries solid particles with average diameter of 0.05 mm and specific gravity 1.20. Given

y = 1.01 centi stokes. Settling velocity of settling particles is:

(A) 0.027 cm/s (B) 3.1 mm/s

24. A main sewer is to be designed to receive a flow from 1 lan 2 area of a community where the

population density is 200 persons/ha. The average sewage flow is 150 litres per capita

per day. Assume peak factor ='3. The design flow for the main sewer is:

(A) 7.934 mlpd (B) 8.13 mlpd

• 25. At shut off head of a centrifugal pump, the discharge is:

(A) Maximum (B) Zero

26. The minimum dissolved oxygen which should always be present in water in order to save

aquatic life is:

(A) 1 ppm • (B) 40 ppm

27. In the case of surface water with a pH range of 6 to 8, which is the most suitable coagulant:

(A) Alum (B) Quick lime

28. The pipe joint commonly used in pumping station are:

(A) Flexible joint (B) Expansion joint

29. The strength of chlorine in fresh bleaching powder is:

(A) About 60% (B) About 10%

30. Estimated the quantity of secondary sludge produced by a secondary settling tank treating

sewage discharge of 3.5 mid. The sludge may be assumed to have a solid concentration of

200 mg/I, removal efficiency of suspended solids as 90% and the solid content of the sludge as

6 per cent :

(A) 10.5 cum/day •

(B) 8.3 cum/day

(D) 7.93 cum/day

81. The equation used for experimental measurement of viscosity is:

(A) Darcy equation (B) Stokes equation

32. Bernoullis equation is derived starting from:

(A) Mass Balance (B) Force Balance

38. Orifieemeter is used for measuring:

(A) Pressure (B) Flow rate

34. Optical Pyrometer working principle is based on:

(A) Stefan -Boltzmann law (B) Weins displacement law

35. Fronde number is directly proportional to:

(A) Impeller speed (B) Fluid viscosity

36. Centrifuging in Ball mills occur when the speed is:

(A) Equal to Critical speed (B) Less than critical speed

37. Peclet Number NPe is the product of:

(A) Reynolds Number and Nusselt Number

(B) Reynolds No. and Prandtl No.

(D) Reynolds No. and Rayleigh No.

38. LMTD correction factors are used for:

(A) Parallel flow (B) Counter Flow

. (C) Cross flow (D) All the above three

39. Slugging in fluidized beds occur when:

(A) Particles are large and heavy

(B) The Vessel is narrow and the bed is deep

(D) Both (A) and (B)

40. Michaelis - Menten parameters can be evaluated using:

(A) Eadie Hoftsee Plot (B) Lineweaver Burke Plot

41. In the CGS system 1 stoke is defined as:

(A) 1 ft2/s (B) 1 ne I s

42. Boiling Point Elevation of solutions strongly influences:

(A) Capacity of multiple effect evaporators

(B) Economy of multiple effect evaporators

(D) Neither capacity nor economy

43. At all humidities Other than zero or hundred percentage, percentage humidity is:

(A) Greater than relative humidity (B) Equal to relative humidity

44. Many important fermentation products like antibiotics are formed during:

(A) Lag phase (B) Growth phase

46. Dilution rate D for a bioreactor is the reciprocal of:

(A) Space Time (B) Residence Time

46. Ficks law of diffusion is analogous to :

(A) Newtons law of viscosity (B) Fouriers law of heat conduction

47. Temperature dependency of equilibrium constant is predicted by:

(A) Vant Hoff Equation (B) Clayperon Equation

48. In an ideal PPR, the reactant concentration:

(A) is uniform within the reactor

(B) varies along the cross section of the reactor

(D) none of the above

49. Baffles in shell and Tube heat exchangers are provided mainly for:

(A) Increasing shell side turbulence (B) Increasing tube side turbulence

50. Conversions in reversible exothermic reactions can be improved by:

(A) Interstage Heating (B) Interstage Cooling

51. Fmssling correlation relates mass transfer coefficient with:

(A) Particle size (B) Particle velosity

52. Knudsen diffusivity is:

(A) Directly proportional to pressure

(B) Independent of pressure

(D) Inversely proportional to pressure

53. Crushing Rolls are:

(A). Primary crushers (D) Grinders

54. Differential method of analysis of kinetic data is:

(A) Complex but accurate (B) Simple and accurate

55. Rate Selectivity parameter is important in the designof:

(A) Multiple reactions (B) Single reactions

.(C) Elementary reactions (1)) None of the above

56. A U-tube manometer is connected to a vessel to measure the pressure inside. If mercury is

the working fluid of manometer, the height difference between two columns of the

manometer measured is 24 cm, the pressure inside the vessel in kPa is:

(A) 31.9 (B) 49.1

57. One kilogram of water is heated from 20°C to 90°C. If the specific heat of water is

4.186 kJ/kgK, the entropy change occurred assuming constant specific heat in kJ/kg1{ :

(A) 0.0786 (B) 9.5321

58. The volume flow rate of a water jet striking a flat plate placed normal to its path is 0.06 m 3/s

and exerts a force of 935 N. Considering the density of water as 1000 Kg/m 3 , the diameter in

mm of the water jet is:

(A) 46 (B) 70

59. In order to have maximum power from a Pelton turbine, the bucket speed must be:

(A) Equal to the jet speed (B) Equal to half the jet speed

60. Heat and work are:

(A) Path functions (B) Extensive properties

61. Air at 20°C blows over a hot plate of dimensions 50 x 60 cm maintained at 250°C. If the

convection heat transfer coefficient is 29 W/m2 °C, the heat transfer took place in kW is:

(A) 36.6 (B) 14

62. In a condenser of a power plant, the steam condenses at a temperature of 70°C. The cooling

water enters at 30°C and leaves at 50°C. The logarithmic mean temperature difference of the

condenser is:

(A) 24.2°C (B) 28.8°C

63. The work done in kJ/kg to pump water isentropically from 100 KPa and 30°C to 5 MPa at a

constant specific volume of 0.001021 m 3 /kg neglecting the changes in kinetic energy and

potential energy is:

(A) 5 (B) 38

64. A refrigerator takes an electrical power of 150 Watts and rejects 450 Watts to surrounding

air. The coefficient of performance of refrigerator is:

(A) 1-2 (B) 0.8

65. Which one of the following is a CPC refrigerant?

(A) R744 (B) R290

66. Tooth interference in an external involute spur gear pair can be reduced by:

(A) Decreasing center distance between gear pair

(B) Increasing pressure angle

(D) Decreasing number of gear teeth

67. The following data refers to two crossed helical gears used for speed reduction. Gear 1: Pitch

circle diameter in the plane of rotation 80 mm and helix angle 30°. Gear H: Pitch circle

diameter in the plane of rotation 120 mm and helix angle 22.5°. If the input speed is

1280 rpm, the output speed in rpm is:

(A) 900 rpm (B) 950 rpm

68. A clutch has outer and inner diameters 100 mm and 40 mm respectively. Assuming a

uniform pressure of 2 MPa and coefficient of friction of liner material 0.4, the torque carrying

capacity of clutch is:

(A) 148 Nm (B) 490 Nm

69. If the equilibrium speed of a governor is constant for all radii of rotation of the fly balls

within the working range, it is known as:

(A) Isochronism (B) Hunting

70. The gyroscopic couple of a suspended disc rotating at 1000 rpm is 15 N -m and the moment of

inertia is 0.4 kg -ms, then the precession velocity of the disc in red/sec is close to:

(A) 0.35 (3) 35

71. The fraction of unbalanced mass used for primary balancing of a reciprocating engine is:

(A) 0.2 (B) 0.9

72. If the balancing mass of a locomotive wheel is 15 kg acting at a radius of 0.7 in when the

wheel has dead weight of 110 kg, the limiting rotational speed of the wheel in rad/sec to avoid

lifting from rails is close to:

(A) 7.1 (B) 6.6

73. The crystal structure of austenite is:

(A) Body centered cubic (B) Face centered cubic

74. The maximum energy that can be absorbed per unit volume without creating a permanent

distortion in a material is known as:

(A) Modulus of resilience (B) Modulus of toughness

75. A stainless steel rod of 10 mm diameter id being reduced to 9 mm by turning on H lathe. If

the spindle rotates at 360 rpm and the tool travel rate is 175 mm/min, the material removal

rate in mm3/min is close to:

(A) 1034.6 (B) 2610.8

76. The welding processes which uses non -consumable electrode is:

(A) Gas metal arc welding (B) Submerged arc welding

77. Internal gear cutting operation can be performed by:

(A) Milling (B) Bobbing

78. For a damped vibrating system, when the critical damping coefficient is less than the

damping coefficient, the system is said to be:

(A) Under -damped (B) Over -damped

79. If two nodes are observed at a frequency of 1200 rpm during whirling of a simply supported

long slender rotating shaft, the first critical speed of the shaft in rpm is.

(A) 1800 (B) 400

80. A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is

increased by 1%, with the internal pressure remaining the same, the percentage change in

the hoop stress is.

(A) 1 (B) 1.25

81. Who was the President of Indian Constituent Assembly?

(A) Dr. B.R. Ambedkar (B) Jawaharlal Nehru

82. The first amendment of Indian Constitution came into force on:

(A) 18-6-1951 (B) 18-6-1952

83. In the Parliamentary system of India, the executive is subordinated to:

(A) The voters (B) Legislature

84. Who is the founder of PRDS?

(A) K.P. Yohannan (B) Poykayil Srikumara Devlin

85. Who helped the Vaikom Satyagrahis by opening a free kitchen for them?

(A) Bengalis • (B) Assamese

86. The women K.P.C.C. President who lead the Quit India and Civil disobedience movements:

(A) Fathima Tleevi (B) Kutty Malu Amma

87. The author of the work 'Odakkuzhal' who won the 'Njanapeetom' Award:

(A) Ulloor (B) Vallalhol

88. Who was the leader to become the head of the Radio Broadcast division , of Indian

Independent League?

(A) K. Kelappan (B) T.K- Madhavan

89. Who visited Mahathma Gandhi at Thirunelvely in 1921:

(A) Kumaran Man (B) Sree Narayana Guru

90. Where was the first SNDP meeting convened? ,

(A) Aluva (B) Varkala

91. Birth place of Saint Kusiako Elias Chavara :

(A) Kandankasy (B) Chennamparampu

92. Which Newspaper was founded by Vakkom Moulavi?

(A) Deshahhimanv (B) Swadeshabhimani

93. Kumaran Man's Veena Poovu was first published in:

(A) Flhashaposhini (B) Mangalodayam

94. Malayali Memorial Memorandum was submitted to:

(A) Sree Moolam Thirunal (B) Sree Ayilyam Thirunal

95. Which one is not a work of Changampuzha?

(A) Ramanan (B) Rakthapuhspangal

96. The Historic struggle lead by Chattampy swamikal to join scheduled class students to

government schools occurred in which place:

(A) Olakettiyambalam (B) Ooruttambalam

97. How many members are there in the Kerala legislative assembly?

(A) 140 (B) 141

98. What is the percentage of seats reserved for women in the Kerala local self government

elections?

(A) 33 (13) 40

99. Who founded the first college in Kerala?

(A) S.N.D.P. (B) N.S.S.

100. Mannathu Padmanabhan was the president of which Devaswom board?

(A) Travancore (B) Malabar

028/2016 14 A

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ASSISTANT ENGINEER - ELECTRICAL - HARBOUR ENGINEERING -----2016

Paper Code:- 30/2016 Date Of Test:-17.02.2016

Maximum: 100 marks

Time : 1 hour and 15 minutes

1. Three resistances each having a value of a Ohm are connected to form a Y structure. If a

3 phase balanced supply with a line voltage of A volts is applied, then the power drawn per

phase from the supply is:

(A) A2/ 3a . (B) 3A2/ a

2. A 230V:50Hz, 10 supply is connected to the series combination of a pure resistance of 500 a

pure variable capacitor of 2511, and a pure variable inductor of 1.5mII. By properly

adjusting the component values, it is made that the current through the circuit is maximum.

What is the power factor of the circuit now?

(A) 0.866 (B) 0.5

3. In 30 power measurement using 2 Wattmeter method, both the Wattmeters are reading

positive and equal. This is becatise :

(A) The load is purely resistive (B) The load power factor is 0.5

4. A dc source of EMI? E Volts and internal Resistance, R Ohms is connected to a variable load

and it is adjusted such that the load abstracts maximum power from the source. The current

drawn from the source is:

(A) 4E/R (B) 2E2/R

5. The minimum number of NAND gates required to implement a NOR gate is:

(A) 1 (B) 2

6. If A and B are boolean variables, the bcolean expression A+ AB is:

(A) 0 (B)

7. Which one among Aluminum, Constantantan Mercury, Carbon have highest resistivity:

(A) Aluminum (B) Constantantan

8. For a two terminal device, resistance decreases when the temperature increases, the

device is:

(A) made up of a metal (B) a semiconductor

9. Which one among the following has 2 fully stable states?

(A) Astable multivibrator (B) Sweep generator

10. In a hydro electric generation system, pressure variations due to rapid changes in velocity of

water is mitigated using:

(A) Tailrace pipe (B) Penstock

11. In a complex network containing active voltage sources with zero internal resistances and

linear bilateral elements the open circuit voltage across 2 terminals is 2W and the resistance

of the network viewed from the open circuited terminal is 6.250. If an eqivalent circuit

comprising of only a current source and impedance is made, the current source rating is:

(A) 25A (B) 6.25A

12. A three phase balanced delta connected load of 5 + j6 Ohm in each phase is connected to a

line voltage of 40W is drawing a current from the supply. If another delta connected load of

same nature and magnitude is connected in parallel, the line current drawn from the supply

becomes:

(A) Double (B) Four times

13. In an synchronous generator, selective elimination of odd harmonics can be done by:

• (A) Distribution of winding . (B) Symmetrical winding

14. The surface integral of the normal component of Electric Field Intensity over a closed surface

is equal to 1 times the total charge inside it. This is the statement of:

(A) Gauss's Theorem (B) Stoke' a Theorem

15. Smooth cylindrical type rotors with less diameter and large axial length are used for

Synchronous generators driven by:

(A) Water turbines (B) Radial turbines

16. If the number of poles in a syncronous machine is 6, a slot angle of 10° mechanical, when

expressed in electrical degrees is:

(A) 60 (B) 20

17. If the number of turns of an inductive coil is doubled and core length is quadrupled, other

parameters being the same, the inductance of the coil became:

(A) doubled (II) halved

18. Which one among the following is TRUE regarding the selection of working flux density in

transformer design?

(A) High flux density in the core results into the reduction in Core loss '

(B) High flux density in the core results into an increase in Popper loss

(D) High flux density in the core results into saving in cost of iron

19. If the ratio of average charge voltage to average discharge voltage in a lead acid cell is 4/3,

the ratio of its Watt Hour efficiency to Ampere hour efficiency is;

(A) 0.75 (B) 413

20. A three phase induction motor runs at 2% slip and its rotor frequency is 1Hz. Stator

frequency in Hertz is: .

(A) 60 (B) 50

21. To have a smooth, quite running of an induction motor by reducing humming and to prevent

cogging, the technique used is called:

(A) Damping (B) Concentrating

22. If the flux per pole of a shunt-wound DC generator is halved and the number of poles is

doubled, the generated e.m.f. at constant speed:

(A) remains the same (13) doubled

23. In dc generators, the winding used in a machine delivering low voltage, high current

load is:

(A) progressive simplex wave winding (B) lap winding

24. Which among the following can support a synchronous motor in Starting.:

(A) Damper winding (B) Frequency divider

25. Two reaction theory is used in the analysis of Synchronous machine to take into account the;

(A) Difference in the number of poles in stator and rotor

or a Cylindrical pole

in achine

(B) Non uniformity of air gap between stator and rotor of a salient pole machine

(D) Difference in the number of poles in stator and rotor of a salient pole machine

26. In a transformer delivering a variable load, Zero voltage regulation can occur at:

(A) 0.45 lagging power factor load (B) unity power factor load

27. In an alternating voltage supply of constant voltage feeding a Transformer, the presence of

higher order harmonics can cause significant changes in: •

(A) Copper losses. (B) Regulation

28. The Maximum percentage efficiency of a 11(VA transformer with iron losses equal to 125 W

at upf load is:

(A) 90 (B) 72

29. Which among the following logic families are fastest in operation?

(A) ECL (B) TTL

30. De Morgan's Law says:

(A) NOR Gate is NOTed AND Gate (B) NAND Gate is NOTed OR Gate

31. Which of the following is/are the features of an Asynchronous counter?

(A) The same clock ptilses are applied to all the constituent Flip flops at a time

(B) Outputs of the flip flop are connected to the inputs of the very next flip flop

(D) None of the above

32. Which one of the following is fully CORRECF regarding 8085 microprocessor?

(A) It does not support handshaking in I/O operations

(3) It has only 6 flags

(D) It has hardware and software interrupts

33. Which among the following is TRUE about an 8086 microprocessor?

(A) Its address and data bus are multiplexed

(13) Its accumulator size is 32 bit

(I)) It does not have Master and Slave Mode operations

34. The excess -3 code corresponding to decimal number 156 is:

(A) 100010001010 (II) 010010110011

35. A Mod -31 synchronous Counter ideally has number of flipflops.

(A) 6 (B) 3

36. Which among the following Ware TRUE regarding the OP AMP circuit?

(A) Voltage follower employees positive feedback

(B) Integrator amplifies noise

(1)) Adder always have an attenuation

37. When comparing Active and Passive filters, which of the following statements are Wrong?

(A) Active filters require power source(s)

(B) Active filters have high input impedance •

(I)) All the above are correct

38. For tunpolar operation. an 8 bit Digital to Analog Converter has a resolution of:

(A) 128 (B) 256

39. In a circuit containing a transistor, both of its junctions are forward biased. It operates

in region.

(A) Cut off (B) Saturation

40. Number of valance electrons in Germanium is:

(A) 2 (3) 5

41. The Switched Mode Power Supplies have higher energy efficiency compared to Linear Power

Supplies because:

(A) it uses isolation transformers

(B) it has devices with large space charge capacitance

(D) it has high switching frequency

42. Gain of an amplifier can be stabilized by:

(A) Employing Positive feedback • (B) Employing Negative feedback

43. If only 5 bites are used for addressing the memory of a computer system, the memory

size is:

(A) 64 (B) 128

44. The ripple factor and efficiency of a half wave rectifier are respectively:

(A) 1.21 and 81.2% (B) 1.21 and 40.6%

45. For a short transmission with series impedance Z, all the capacitances being negligibly small,

the ABCD constants of the line are:

(A) A r-1,B=Z,C=0,D=1 (B) A=Z,B=1,C=1,D=0

46. The load flow analysis algorithm having the least rate of convergence is:

(A) Newton Raphson Method (B) Fast Decoupled Load -Flow Method

47. The Opposition to the flow of current in a conductor can increase in *alternating circuits

compared to dc circuits due to :

(A) Proximity effect (B) Skin effect

48. What is meant by a flat line or Infinite line?

(A) Line open circuited

(B) Line with surge impedance equals the characteristic impedance

(D) Line through which Power transmitted is high

49. Which one among the following is a method for equalizing the potential across the various

units of a string insulator?

(A) Usage of smaller cross arm (B) Usage of step grading

50. Under ground cables are less preferable in high voltage transmission because of:

(A) poor insulation (B) high charging current"

51. The metals normally used in a IIRC fuse are:

(A) Tin and lead (B) Tin and Silver

52. The transient stability of a power system can be improved by:

(A) Using rotor of lower Moment of Inertia for generator

(B) Using parallel lines

(D) None of the above

58. For economic load dispatch:

(A) Incremental efficiency of each machine should be same

(B) Incremental production cost of each machine should be same

()) None of the above.

54. In a power system, the cost of generated electrical enegry will be low if:

(A) both load factor and diversity factor are low

(B) both load factor and diversity factor are high

(D) Load factor low, Diversity factor high

56. An over exited synchronous machine has a lagging powerfactor. The machine is:

(A) Motoring (B) Generating

56. Which among the following is/are CORRECT about an RC phase shift oscillator?

(A) The RC network provides a phase shift of 180°

(B) It makes use of positive feedback

(I)) All the above

57. In class B operation of power amplifiers, the collector current flows for:

(A) Less than a quarter of a cycle (B) The whole cycle

58. For the characteristic equation 2S4 + S3 + 332 +5s +10 a 0, the number of roots in the loft

half S plane is :

(A) 2 03) 1

59. The unity negative feedback system with GMS

)a- „ (10s+ 0

i oscillates at 2rad/s only

V- +Etasa-4k)

when:

(A) k = 1 (B) k = 2 and a =1

60. The steady state error of a negative feedback system with forward path gain function

-1--c and feedback path gain function HO= for a unit step input is

(S+) (S +

given by:

(A) infinity (B) zero

61. The ratio of total power in the Amplitude modulated wave to the unmodulated carrier power

when the modulation index is 'in'

(A) I +2m2 (B) 1+ 0.5,1,2

62. The voltage across a load element is 40Z-15 and the current through the element is

2.5Z -30. The circuit powerfactor is:

(A) Lagging (B) Leading

63. 100 numbers of H2 linear bilateral resistances are connected in parallel and the combination

is fed by a WA constant current source. The power delivered by the source is:

(A) 10W (11) 1 W

64. Referring to a power plant, the term hot reserve refers to:

(A) Reserve generating capacity not in service, but in operation

(B) Reserve generating capacity not in service, but available

(D) All the above

65. Power supply used for dielectric heating will normally have a frequency in the range:

(A) 1 to 5 kHz (B) I to 5 MHz

66. As per Kelvin's Law, the most economical 817.0 of conductor is that for which:

(A) The variable part of the annual charges is equal to the St of annual energy

losses

(B) The constant part of the annual charges is equal to the cost of energy losses per

year

(D) The constant part of the energy charges is equal to the cost of annual energy

losses

67. Output voltage of a simple ideal buck type dc -dc converter working in continuous current

mode with an input voltage of 12V and turn ON time 5ms and switching frequency 501Iz is:

(A) 6V (B) —6V

68. A power electronic circuit which can give a 2.5V, 30Hz output wave from a supply of 5V,

60Hz supply is:

(A) Voltage Source Converter (B) Cyclo converter

69. In a power electronic circuit, a free wheeling diode is used across a de load to:

(A) Reduce output voltage ripple

(B) Prevent reversal of load voltage

(D) All of the above

70. Ten, 15V batteries each having an internal resistance of 30 are connected in series such that

one is aiding the others. Its Norton's equivalent circuit has:

(A) A current source of 0.5A and parallel resistance of 30

(B) A current source of 5A and parallel resistance of 301)

(D) None of the above

71. The value of specific gravity of a lead acid battery under fully cargod condition is

approximately:

(A) 1.21 • (B) 2

72. Which one of the following is equal to one ampere of current?

(A) Siemens/second (B) Watt/second

73. An Ammeter is found to have a cramped scale. This is because:

(A) it employees eddy current damping

(B) it has spring control

(D) of both (B) and (C)

74. Of the power electronic circuits, circuit employing Power MOSFETa has a higher switching

frequency because:

(A) MOSFET is a majority carrier device

(B) MOSFET has high input impedance

(C)MOSFET has insulated rate

(D) MOSFET has low signal to noise ratio

75. A measure of repeatability of measurement of a quantity is:

(A) Precision (B) Accuracy

76. The analogous electrical circuit quantity corresponding to the magnetic circuit quantity,

permeability is:

(A) Conductivity (B) Resistivity

77. In load flow analysis the role of a slack bus is:

(A) as the reference bus

(B) as a bus which can absorb and gives out active power

(D) all of the above

78. Rotation of a Rotating Induction Type Mechanical Energy Meter under no load condition can

. be reduced by:

(A) Copper shading bands (B) Compensating coils

79. The needle of a MI Ammeter oscillates around a central value. It may be due to poor:

(A) Damping torque (B) Controlling torque

80. The range of an Ammeter is to be extended from 250 mA to 2A. If the 250 mA meter has an

internal resistance of 100, what is the approximate value of the shunt resistance required to

extend the range:

(A) L430 (B) 2.50

81. Time taken by the Constituent Assembly to prepare Constitution is?

(A) 2 years 10 Months 8 days (B) 2 years 11 Months 17 days

82. In India Fundamental duties are adopted from:

(A) UK Constitution (B) USA Constitution

83. Who is the author of Ente Gurunathan?

(A) Vallthol Narayana Menon (B) G Sankara Karim

84. The place where Ayyankali started a school for depressed classes?

(A) Neyyatinkara (B) Varkala

85. Who started the News Paper 'Mithavade in 1907?

(A) Moorkoth Kumaran (B) Vakkom Moulavi

86. Who wrote Sahithya Vicharam'?

(A) Joseph Mundassery (B) Kesava Dev

87. How many people signed in 'Ezhava Memorial'?

(A) 10028 (B) 13716

88. 'Jathy Kummy' which criticized the prevailing caste sy stem was written by:

(A) 1' K Madhavan (B) Pandit Karuppan

89. Who introduced the 'Subsidiary Alliance System'?

(A) Warren Hastings (B) Lord Lytton

90. The national Anthem of India 'Jana gana Mana' was first sung at:

(A) Calcutta 1911 (B) Delhi 1912

91. Who is known as 'Kerala Kalidasan'? •

(A) A R Raja Raja Varma

(B) Raja Ravi Varma

(D) Kodungaloor Kunjikuttan Thampuran

92. 'Oru Therlivinte Kadha' was written by:

(A) Ponkunnam Varkey (B) S K Pottakkad

Vaikkam Muhammad Basheer (I)) Thakazhy Sivasankara Pillai

93. Who was the first Indian to be elected to the British parliament?

(A) Gopala Krishna Ghokliale • (B) Mettilal Nehru

94. The great Victoria Desert is located in:

(A) Africa (B) Europe

95. Ajanta Caves are located in the state of:

(A) Gujarat (B) Orissa

96. At which place Gauthama Buddha delivered his first sermon?

(A) Lumbini (B) Magadha

97. In which of the following states does 16th National Women Boxing Championship take place?

(A) Meghalaya (B) Assam

98. Who has been elected as the first male member of national Commission for women?

(A) Alok Itawat (B) Chethan Bhagat

99. Who has won the Nobel Prize 2015.in Literature?

(A) Patrick Modiano (B) Youyou Tu

100. World Water Day is celebrated every year on.:

(A) July 12 (B) May 22

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PSC SOLVED QUESTIONS

ELECTRICIAN - AGRICULTURE--------------2016

ASSISTANT ENGINEER - DIRECT/BY TRANSFER - KERALA WATER AUTHORITY-----2016

ASSISTANT ENGINEER - ELECTRICAL - HARBOUR ENGINEERING -----2016

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