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

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

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