| Post Name | Assistant Engineer |
|---|---|
| Department | Kerala Water Authority |
| Question Paper Code | 121/2022 |
| Date of Test | 29 December 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
A steel bar 20 mm in diameter, when subjected to axial pull of 50 kN, elongates by 0.20 mm
over a gauge length of 20 cm. The diameter of the bar is reduced by 0.004 mm. Bulk modulus
of the material of the bar is :
Answer
Question Cancelled
2
A floor is supported by beams of rectangular cross section 7 cm wide, 20 cm deep and
span 4.5 m. The floor carries a load of 10 kN/m2. If the permissible bending stress in the
beam is 8 MPa, the maximum permissible spacing of the beams is :
Answer
C. 15 cm
3
A hollow circular shaft has inner diameter of 90 mm and thickness 25 mm. The shaft is
subjected to a torque of 12 kNm. If the modulus of rigidity of the material of the shaft is
80 GPa, the shear stress at the inner curved face of the shaft is :
Answer
A. 17.26 MPa
4
Crippling load of column A is half of that of column B. If both the columns have the same
height, end conditions of A and B are respectively :
Answer
D. One end fixed the other hinged, both ends fixed
A 3
5
A manometer is used to measure the pressure of a gas filled rectangular tank as shown in
Fig. below. It is assumed that the mass density of fluid inside the tank is zero.
kN
The manometric fluid is water having specific weight 10 . If the local atmospheric
m3
pressure is 100 kPa, the absolute pressure within the tank is :
Answer
A. 110 kPa
6
For a two dimensional flow having velocity potential function Ο = 4 xy and stream function
4
Answer
C. 8 m3/s
7
Choose the wrong statement out of the followings mentioned connected with drag and lift forces on immersed bodies:
Answer
D. Lift force occurs on a body when there is symmetry of fluid motion.
8
The water plane area of a heavily bottom loaded cargo ship is shown in the Fig. below :
Choose the correct statement regarding the stability of the floating ship
Answer
C. The rotational stability about of YY axis is the design criteria
9
If the contour values are 100, 110, 115, 120, 130 moving inwards, and all the contours are
seemed to be touching each other at only one common point, the inference is that the terrain
represented is :
Answer
B. a vertical hillside
10
A Mass diagram is used for :
Answer
C. both
11
In transit theodolite, the verniers have a least count of :
Answer
D. 20 seconds
12
Bar bending schedule is made to :
Answer
Question Cancelled
13
How much quantity of gypsum shall be added to control the setting time of Portland cement
during its manufacturing process?
Answer
C. 3 to 5%
14
Which of the following is a key ingredient in the preparation of high performance concrete?
Answer
A. Silica fume
15
The curved triangular space formed between the extrados and the horizontal line through the
crown is known as :
Answer
D. Spandril
16
As per the specification in IS 456:2000, the transverse reinforcement for torsion shall be :
Answer
B. rectangular closed stirrups placed perpendicular to the axis of the member
17
The development length required for a reinforcement bar of 12 mm diameter and grade
Fe415, at a section where design bond stress is 1.92 MPa :
Answer
Question Cancelled
18
High strength concrete is necessary for prestressed concrete because it :
Answer
D. all of the above
19
A double angle discontinuous strut consists of two identical angles placed back-to-back which
are tack bolted. Comparing the compressive strength of two cases, viz., (i) Angles placed on
opposite sides of the gusset plate (ii) Angles placed on the same sides of the gusset plate :
Answer
Question Cancelled
20
A soil stratum is 10 m thick with pervious stratum on top and bottom. Determine the time required for 50% consolidation. Given: Coefficient of permeability = 10β»β· cm/sec; Coefficient of compression = 0.0003 cmΒ²/gm; Void ratio = 2; Time factor = 0.197.
Answer
C. 570 days
21
Plan of a three legged tower forms an equilateral triangle of side 4 m. If total weight of tower
is 450 kN and is equally carried by all the legs. Compute the vertical stress increase in soil by
the tower at a depth of 4 m directly below one of the legs :
4m 4m
4m
Answer
B. 6 kN/m2
22
The total unit weight of soil is 18.8 kN/m3, the specific gravity (G) of the solid particles of soil
is 2.76 and the water content (w) of the soil is 12%. Calculate the void ratio :
Answer
Question Cancelled
23
What will be the ratio of average permeability in horizontal direction to hat in the vertical direction (kH/kV) for a soil deposit consisting of 3 horizontal layers, if the thickness and permeability of the second layer are twice of those of the first and those of the third layer twice that of the second?
Answer
A. 9/7
24
Height of buildings is strictly restricted in zoning when :
Answer
B. the site is close to an airport
25
The facility in a port, to allow for ships to be taken on repair is known as :
Answer
C. Dock
26
The resultant force of two equal forces P is also equal to P. The angle between them in degree
is :
Answer
D. 120
27
The unit of moment of force is:
Answer
B. Nm
28
Three forces A, B and C of magnitude 4N, 6N and 10N acting on a particle are in equilibrium.
It can be concluded that :
Answer
D. B and C are acting in opposite direction
29
Which of the following elements has simple cubic structure?
Answer
B. Polonium
30
Which one of the following will decrease when the percentage of carbon increases?
Answer
B. Ductility
31
The elongation of shaft A is four times the elongation of shaft B when subjected to equal
tensile force. If the modulus of elasticity length of both shafts are the same then :
Answer
A. Diameter of A is half the diameter of B
32
The bulk modulus of metal A is twice of metal B and modulus of rigidity of A is three times of
metal B, which one of the following is correct?
Answer
Question Cancelled
33
Which of the following statements is/are correct regarding the pressure angle of a cycloid
gear tooth profile?
(i) Pressure angle is constant throughout the profile
(ii) Pressure angle is zero at the pitch point
(iii) Pressure angle is maximum at the beginning and end of contact
(iv) Pressure angle varies from point to point
Answer
D. (ii), (iii) and (iv) only
121/2022 8 A
34
Which of the following statements is/are true about contact ratio?
(i) It measures the average number of teeth in contact during meshing
(ii) Contact ratio is always maintained at one
(iii) A lower contact ratio necessitates a higher degree of accuracy in machining
(iv) The angle of action must be greater than pitch angle
Answer
A. (i), (iii) and (iv) only
35
Which of the following statements is/are true about velocity ratio of worm gear drives?
(i) Velocity ratio is the ratio of diameter of the worm wheel to the diameter of the worm
(ii) Velocity ratio is the ratio of number of teeth on the wheel to the number of teeth on the
worm
(iii) Velocity ratio is the ratio of the number of teeth on the worm wheel to the number of
starts on the worm
(iv) Velocity ratio is the ratio of speed of worm to the speed of worm wheel
Answer
C. (iii) and (iv) only
36
The energy dissipated in viscous damping is proportional to :
Answer
B. Square of the amplitude
37
Which of the following statements is/are true with respect to Coulomb damping?
(i) Damping force is constant
(ii) Damping force is independent of relative velocity
(iii) Damped natural frequency of vibration is same as undamped natural frequency
(iv) Loss of amplitude per cycle is four times the ratio of frictional force to stiffness
Answer
D. (i), (ii), (iii) and (iv)
38
Which of the following statements is/are true about contact ratio?
(i) It measures the average number of teeth in contact during meshing
(ii) Contact ratio is always maintained at one
(iii) A lower contact ratio necessitates a higher degree of accuracy in machining
(iv) The angle of action must be greater than pitch angle
Answer
C. (i) and (ii) only
39
The relation between shear stress Z and velocity gradient (du/dy) of a fluid is given by Z = A(du/dy)βΏ, where A and n are constants. If n < 1, what type of fluid will it be?
Answer
C. Pseudoplastic
40
The speed of water in a hose increased from 2 m/s to 25 m/s going from hose to the nozzle, given the absolute pressure in the nozzle is 1 Γ 10β΅ N/mΒ² (atmospheric), assuming level frictionless flow. Calculate the pressure in the hose (density of water 1000 kg/mΒ³):
Answer
A. 4.10 Γ 10β΅ N/mΒ²
41
Pelton wheel is used in those places where :
Answer
A. high head and low discharge are available
42
The thermal conductivity of a solid depends upon the solid's temperature as K = aT + b, where a and b are constants. The temperature of the planar layer of this solid as it conducts heat is given by:
Answer
C. aTΒ² + bT = Cβx + Cβ
43
The thermal resistance of heat conduction through a hollow sphere of inner radius rβ and outer radius rβ is:
Answer
B. (rβ β rβ)/(4Οkrβrβ)
44
It is proposed to coat a 1 mm diameter with enamel paint (k = 0.1 W/mK) to increase the heat transfer with air. If the air side heat transfer coefficient is 100 W/mΒ²K, the optimum thickness of enamel paint should be:
Answer
C. 0.5 mm
45
Which of the following is/are true about a line organization?
(i) Authority flows directly from the top of the organization to lower levels of management
(ii) Scalar principles and the principle of unity of command are followed
(iii) Line managers may depend too much on the staff experts
Answer
A. Only (i) and (ii)
46
Which of the following is true about a budget?
(i) Helps to provide guidelines about organizational resources and expectations for their
use
(ii) Helps to define control system standards
(iii) Helps to evaluate the performance of managers and work units
Answer
D. All of the above (i), (ii) and (iii)
47
Which of the following is not a principle of organization?
Answer
C. Principle of redundancy
48
Which of the following is/are correct about the disadvantages of welding?
(i) Welding results in residual stress and distortion of workpieces
(ii) Portable welding equipment is not available
(iii) Edge preparation of the workpiece is generally required before welding them
Answer
C. Only (i) and (iii)
49
Which of the following is the property of molding sand which permits the escape of steam and
other gases generated in the mold during hot metal pouring?
Answer
B. Permeability
50
Which of the following is true for a gating system in casting?
(i) A gating system may be composed of a runner, riser, sprue, etc.
(ii) A gating system should have sudden or right-angled changes in direction
(iii) A gating system should fill the mold cavity completely before freezing
Answer
C. Only (i) and (iii)
51
The energy required per unit mass to grind lime stone particle of very large size to 100 ΞΌ m is
12.7 Kwh/ton. An estimate (using Bonds law) of the energy to grind the particles from a very
large size to 50 ΞΌ m is :
Answer
C. 18.0 Kwh/Ton
52
What is the critical rotational speed in r.p.s. for a ball mill of 1.2 m diameter charged with
70 mm diameter balls?
Answer
D. 0.66
53
For a sphere falling in a constant drag coefficient regime, its terminal velocity depends on its diameter D as:
Answer
B. Dβ°Β·β΅
54
A 30% (by volume) suspension of spherical particles in a viscous oil has a hindered settling velocity of 4.4 ΞΌm/s. If the Richardson-Zaki hindered settling index is 4.5, then the terminal settling velocity of sand grain is:
Answer
C. 21.9 ΞΌm
55
Separation factor of a cyclone separator having 0.5 m diameter and tangential velocity of 20 m/s is:
Answer
C. 160
56
A flue gas contains CO2 , O2 and N 2 . The mixture contains 14% CO2 and 6% O2 by mole. If
the flue gas is at 200Β°C and 765 mm Hg pressure, partial pressure of N 2 in the mixture is :
Answer
D. 612 mm Hg
57
Wet leather with a moisture content 60% enters a drier and leaves with 10% moisture
content. If the product flow rate is 500 kg/h, feed to the drier and water removed (in kg/h) are
respectively :
Answer
A. 1125 and 625
58
Pick out correct statement related with Amagatβs law :
Answer
A. Volume of gas mixture equals sum of pure component volumes at the same
temperature and pressure as that of the mixture
59
Dew point method can be used to measure :
Answer
D. All the above
60
Gas expansion thermometers are based on the principle of :
Answer
A. Ideal gas law
61
Which of the following is used for level measurement in open vessels?
Answer
B. air-trap system
62
Controller suitable for a process, where no offset is tolerable, is :
Answer
Question Cancelled
63
Transfer function of PD control is (Kc is gain, ΟD is derivative time and ΟI is integral time):
Answer
A. P(s)/Ξ΅(s) = Kc(1 + ΟDs)
64
Error detector is absent in :
Answer
B. Open loop systems
65
If the temperature of the atmosphere increases at constant absolute humidity, the percentage
saturation would be :
Answer
C. Decrease
66
For a two phase feed, where 80% of the feed is vaporized under column condition, the feed line slope in the McCabe-Thiele method for distillation column is:
Answer
A. β1/4
67
At 750 K and 1 atm, the approximate value of the Schmidt number for air is :
Answer
D. 1
68
The absorption factor is defined as :
Answer
A. L/mG
69
Simultaneous heat and mass transfer are occurring in a fluid over a flat plate. The flow is laminar. The concentration boundary layer will coincide with the thermal boundary layer, when:
Answer
D. Sc = Pr
70
In distillation column sizing calculations by short cut methods, match the following :
P Underwoods equation 1 Number of real trays
Q Fenske equation 2 Column diameter
R Gilliland equation 3 Minimum Number of ideal trays
S Vapour velocity at flooding 4 Actual number of ideal
5 Minimum reflux ratio
6 Tray efficiency
Answer
D. P-5, Q-3, R-4, S-2
71
Stereo specific polymers are produced by ββββββ type of polymerization.
Answer
C. Coordination polymerization
72
Styrene which is a monomer for the production of polystyrene is commercially produced by
the :
Answer
D. Catalytic dehydrogenation of ethyl benzene
73
What is the role of potassium persulfate in polymerization reaction?
Answer
C. Initiator
74
Bulk polymerization is not suited for ββββββ type of reaction.
Answer
A. Highly exothermic reaction
75
Nylon 66 is so named because :
Answer
B. The number of carbon atoms between two nitrogen atoms are 6
76
Free residual chlorine is seen in :
Answer
C. Treated water
77
Reciprocating pump is used for :
Answer
B. Low discharge and high head
78
Which of the following is not tested during physical analysis of water?
Answer
D. pH
79
Chemical formula for bleaching powder is :
Answer
C. CaOCl2
80
Which of the following is the most destructive form of residual chlorine?
Answer
B. Hypochlorous acid
81
Which of the statement is true? Objective of Water audit is :
Answer
D. All of the above
82
Surface loading for a rectangular sedimentation tank of length L, width B, height H and
having a discharge Q is given by :
Q Q
Answer
B. BH BL
BLH Q
83
Flow through period of a sedimentation tank, when compared to its detention time is always :
Answer
B. less
84
The method, which is most widely used for analyzing and designing the pipes of all types of
complex water distribution networks, is :
Answer
A. Hardy cross method
85
Iron and manganese can be removed from water by :
Answer
D. Aeration followed by coagulation
86
Chlorine demand of water is:
Answer
C. (A) β (B)
87
Which of the following is not a coagulant?
Answer
A. Potassium permanganate
88
The efficiency of sedimentation tank does not depend upon :
Answer
B. Depth of the tank
89
The suitable layout for a water supply distribution system, for an irregularly grown town is :
Answer
A. Dead end system
90
In population forecasting, compared to the geometrical increase method, the arithmetical
increase method gives :
Answer
B. Lesser value
91
Pickup the incorrect statement :
Answer
D. Sewer pipes can be carried up and down the hills and valleys
92
The specific gravity of sewage is :
Answer
C. Slightly greater than 1
93
If the depletion of oxygen is found to be 2 mg/l after incubating 3 ml of sewage diluted to
300 ml, at 20Β°C for 5 days, then the BOD5 of the sewage would be :
Answer
A. 200 mg/l
94
While testing for COD of sewage, organic matter is oxidized by K 2Cr2O7 in the presence of :
Answer
B. H2SO4
95
High COD to BOD ratio of an organic pollutant represents :
Answer
B. Low biodegradability of the pollutant
96
Primary treatment of sewage is meant for :
Answer
Question Cancelled
97
The following residual chlorine compounds are formed during chlorination of water :
1. NH,Cl,
2. NHCl,
3. HOCI
4. OCl-
The correct sequence of formation of these residual chlorine compounds is :
Answer
Question Cancelled
98
Imhoff cone is used to measure, in sewage :
Answer
D. Settleable solids
99
Standard 5 day BOD at 20Β°C, when compared to ultimate BOD, is about :
Answer
B. 68%
100
The graph between the amount of organic matter left in sewage, and time elapsed in days is :
Answer
C. Exponential
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