| Post Name | Mechanic Grade-II - State Farming Corporation of Kerala Ltd |
|---|---|
| Question Paper Code | 227/2023 |
| Category Code | 006/2023 |
| Date of Test | 17 November 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
For stable equilibrium :
Answer
B. Metacentre is above the centre of gravity
2
The instantaneous position of all fluid particles which have passed through a given point is
called :
Answer
D. Streak line
3
A fresh-water lake has maximum depth 60 m and mean atmospheric pressure 91 kPa. The absolute pressure at maximum depth is ______ kPa (take g = 10 m/sΒ²).
Answer
C. 691
4
Choose the correct assumptions of Bernoulliβs equation :
(i) Steady flow
(ii) Incompressible flow
(iii) Rotational flow
Answer
B. Only (i) and (ii)
5
For small orifice the head of the liquid from the centre of the orifice is more than
ββββββββββββ times the depth of orifice.
Answer
D. five
A 3
6
The sheet of water flowing through a notch is called :
Answer
C. Nappe
7
Which of the following statements are correct for the frictional resistance for turbulent flow?
(i) Proportional to density of fluid
(ii) Inversely Proportional to area of surface in contact
(iii) Independent of pressure
(iv) Inversely proportional to square of velocity
Answer
B. Only (i) and (iii)
8
The coefficient of bend βkβ depends on :
(i) Angle of bend
(ii) Radius of curvature of bend
(iii) Diameter of pipe
(iv) Length of bend
Answer
C. Only (i), (ii) and (iii)
9
The pressure rise due to water hammer in pipes depends on :
(i) The length of the pipe
(ii) Velocity of flow of water in pipe
(iii) Time taken to close the valve
(iv) Elastic property of the material of the pipe
Answer
D. All the above (i), (ii), (iii) and (iv)
227/2023 4 A
10
In an fluid flow if the force due to compressibility is negligible then the equations of motions
are called :
Answer
A. Reynoldβs equation of motion
11
A liquid jet with relative density 0.8 strikes a flat plate normally at 10 m/s. The jet area is 0.04 mΒ². The force exerted is:
Answer
C. 3.2 kN
12
An adjustable propeller turbine is called :
Answer
D. Kaplan turbine
13
Which of the following water turbine does not require draft tube?
Answer
A. Pelton turbine
14
Air vessel is used in reciprocating pump to obtain :
Answer
B. Continuous supply of water at uniform rate
15
The specific speed of a hydraulic turbine depends upon :
Answer
D. Speed, power developed and head of water
A 5 227/2023
16
Hydraulic efficiency of a hydraulic turbine is the ratio of the :
Answer
A. Runner power to water power
17
The function of governor in a hydraulic turbine is to :
Answer
C. Maintain the speed constant under all conditions
18
Slip of reciprocating pump becomes negative when :
Answer
B. Actual discharge is more than theoretical discharge
19
Cavitation in centrifugal pumps can be reduced by :
Answer
A. Reducing the suction head
20
A single acting reciprocating pump having single cylinder area of 0.3 m2 and stroke length
0.1 m running at a speed of 180 rpm. Theoretical discharge of the pump will be :
Answer
B. 0.09 m3/s
21
In the resistance thermometer the charge in resistance of a metal wire due to its changes in
temperature :
Answer
B. Thermometric Property
22
As mixing is also a irreversible process it also decreases availability and increases
unavailability of the system. The loss of availability energy is always associated with never
increase :
Answer
B. Entropy
23
Heat pump is a device which working in a cycle delivers energy from low temperature system
usually work or energy as required as input :
Answer
Question Cancelled
24
We have defined the criterion of reversibility and discussed some factors that render a
process irreversible we have also started that it is impossible to have an engine of 100%
efficiency but we have not answered the question. What is the maximum value of thermal
efficiency if not?
Answer
Question Cancelled
25
The specific heat of a substance at constant volume C_v is defined as the rate of change of specific internal energy with respect to temperature while volume is held constant:
Answer
Question Cancelled
26
In the process occurs on account of a finite temperature gradient is called :
Answer
Question Cancelled
27
Steady flow means that the rates of flow of mass and change across the control surface are :
Answer
A. Constant
28
For conservation of mass with no accumulation within the control volume, the entering mass flow rate must equal the leaving mass flow rate:
Answer
A. Wβ = Wβ
29
Consider a reversible and an irreversible engine to operate between same limit :
Answer
A. Temperature
30
The changes of the entropy of the principle of increase of entropy of the system it is loosing
heat :
Answer
Question Cancelled
31
A good fuel is one which has :
Answer
C. Low ignition point and high calorific value
32
Calorific value of liquid fuel is the amount of heat liberated :
Answer
C. By complete combustion of 1 kg of fuel
33
Bomb calorimeter is used to determine :
Answer
A. Higher calorific value of solid and liquid fuels at high pressure
34
To calculate net calorific value, product of combustion are :
Answer
B. Allowed to escape
35
Mass of excess air supplied is equal to :
100 23
Answer
A. Γ Mass of excess oxygen
36
Steam at 8 bar has a sensible heat of 720 kJ/kg and latent heat of 2045 kJ /kg. If the steam is
80% dry, then the total enthalpy is :
Answer
B. 2356 kJ/kg
37
The critical pressure ratio for initially super heated steam is :
Answer
B. 0.546
38
To reduce the speed of impulse turbines to practical limits, the method used is :
Answer
D. All of the above
39
The cycle generally used for gas turbine is :
Answer
D. Brayton cycle
40
In case of reaction steam turbine :
Answer
C. The steam is expanded both in fixed and moving blades continuously
41
The modulus of elasticity E and bulk modulus K are related by ______ (take Poissonβs ratio = 1/m).
Answer
A. K = mE/[3(m β 2)]
42
The rod of length L tapers uniformly from a diameter D to a diameter B and carries an axial
load of P then the extension of the road :
ΟPL 4 PL
Answer
B. 4 EDB ΟEDB
ΟEL ΟPEL
43
For the bars of composite section, which is true :
Answer
D. None of the above
44
The point of contraflexure will occurs when :
Answer
A. Bending Moment changes its sign
45
The torsional rigidity of a shaft is equal to :
Answer
C. Product of modulus of rigidity and polar moment of inertia
46
The crippling load according to Eulerβs theory of long column when both ends of the column
are hinged :
4Ο 2 EI Ο 2 EI
Answer
D. l2 l2
227/2023 10 A
47
The radius of gyration is given by the expression for a uniform body, (Take I-Moment of
Inertia, M-Mass moment,
Answer
B. ο¦I οΆ
ο§ ο· ο§ ο·
ο¨ I οΈ ο¨AοΈ
ο¦AοΆ ο¦ IM οΆ
48
Thermal Strain is given by ( Ξ± -Coefficient of linear expansion, T- Rise in Temperature,
E-Youngβs Modulus, Ξ΅ -Strain) :
Answer
A. Ξ±T
49
Mohrβs circle reduces to a point :
Answer
Question Cancelled
50
The ratio of thickness to internal diameter of a cylindrical shell is less than ββββββββββββ,
the shell is called a thin cylinder.
Answer
B. 1/20
51
Which of the following represent the engineering requirements of materials?
Answer
D. All of the above
52
Effect of adding phosphorous to cast iron :
Answer
B. Aids fusibility and fluidity
53
Special kind of annealing process used for wire, spring etc to prevent them from fracture and
to improve strength and toughness is:
Answer
C. Patenting annealing
54
Normalizing of hypoeutectoid steel is done :
Answer
A. Above upper critical temperature
55
The surface hardening process also known as cementation is :
Answer
D. Carburizing
56
Muntze metal is the combination of :
Answer
Question Cancelled
57
Addition of silicon to steel increase :
Answer
D. All of the above
58
Which of the following is a thermoplastic?
Answer
B. Nylons
59
ββββββββββββ is an example for hard magnetic material.
Answer
C. Rem Alloy
60
TTT diagram illustrate the duration needed for isothermal transformation from :
Answer
A. Austenite to Pearlite
61
What is the purpose of tongue and groove joint in carpentry work?
Answer
A. To increase breadth
62
Which gas flame is used in welding of bronze?
Answer
B. Oxidizing flame
63
What is the substance used to dissolve acetylene in a DA cylinder?
Answer
D. Liquid acetone
64
Which is the folded edge on a sheet metal object?
Answer
C. Hem
65
In moulding sand preparation, the ability of sand particles to stick together is known as :
Answer
C. Cohesiveness
66
The cutting edge angle of a hot chisel is :
Answer
B. 30Β°
67
The relief angle of single point cutting tool varies from :
Answer
D. 5Β° β 15Β°
68
Circumference of a work piece is divided in 6 equal division using index plate of 24 slots, the
required indexing ratio is :
Answer
B. 4
69
In shaper machine, the stroke Length of ram can be increased by :
Answer
D. Increasing radial distance of crank pin
A 13 227/2023
70
What is the distance between two adjacent teeth in a 25 TPI hack saw blade?
Answer
C. 1 mm
71
The ratio of the eccentricity of a hyperbola to that of an ellipse is :
Answer
B. Greater than one
72
In the first angle of projection, the top view (TV) and the front view (FV) of the object lie :
Answer
C. TV below xy-line and FV above xy-line
73
In isometric projections all the edges parallel to isometric axes are foreshortened such that
the ratio of isometric length to true length is equal to :
Answer
A. 0.816
74
The method used for the development of spheres and paraboloids is :
Answer
C. Approximate method
75
A single riveted lap joint is made in plates of thickness 8 mm with 20 mm diameter rivets. If
the permissible shear stress in rivets is 70 N/mm2, find the shearing resistance of a single
rivet :
Answer
B. 22000 N
76
If t = throat thickness, h = weld leg, l = weld length and Οβ = allowable tensile strength of weld metal, then the tensile strength of a single transverse fillet welded joint is:
Answer
A. 0.717h Γ l Γ Οβ
77
The types of threads commonly used in screw mechanisms for industrial machines are :
Answer
D. Acme thread
78
The types of parallel key which transmits turning moment and also permits axial movement
between shaft and hub is :
Answer
C. Feather key
79
Power transmitted through a flat belt drive becomes maximum when the ratio of maximum
tension to centrifugal tension equals :
Answer
B. 3
80
The angle between the tangent to the thread helix on the picth cylinder and axis of worm in a
worm gear is called :
Answer
D. Helix angle
81
Which among the following boilers are Fire Tube Boilers?
(i) Lancashire Boiler
(ii) LaMont Boiler
(iii) Benson Boiler
(iv) Cornish Boiler
Answer
A. (i) and (iv)
82
Which among the following are Boiler Mountings?
(i) Steam Separator
(ii) Pressure Gauge
(iii) Steam Stop Valve
(iv) Economizer
Answer
B. (ii) and (iii)
83
Which of the following chemicals are the ingredients of the mixture used for comparing the
ignition quality (knocking tendency) of S.I Engines fuels?
(i) Iso-Octane.
(ii) Ξ± -methyl naphthalene.
(iii) n β heptane.
(iv) hepta-methyl nonane.
Answer
D. (i) and (iii)
84
What is the effect of short ignition delay, in knocking tendency of 4 stroke I.C. Engines?
Answer
C. Reduces the knocking tendency in diesel engines and increases the knocking
tendency in petrol engines
85
Which of the following statements is correct regarding G.D.I. electronic fuel Injection system?
Answer
D. The fuel is directly injected into the engine cylinder or combustion chamber
86
Which of the following statements are correct regarding Cohran Boilers?
(i) It is a water tube boiler.
(ii) It is a horizontal boiler.
(iii) It is a fire tube boiler.
(iv) It is a vertical boiler.
Answer
C. (iii) and (iv) are correct
87
The compression ratio of a square engine having a cylinder bore of 8 cm and clearance
volume of 16Ο cm3 :
Answer
A. 9:1
88
The theoretically correct air β fuel ratio for most effective combustion in petrol engine is :
Answer
A. 14.7 : 1 by weight
89
Which among the following is not a part of C.R.D.I system?
Answer
D. Throttle Position sensor
90
Which among the following are Boiler Accessories?
(i) Steam trap
(ii) Fusible Plug
(iii) Water Level Indicator
(iv) Pressure Reducing Valve
Answer
A. (i) and (iv)
91
Heat transfer takes place according to the ββββββββββββ law of thermodynamics.
Answer
B. Second
92
Transfer of heat in liquids and gases is essentially due to :
Answer
A. Convection
93
According to Fourierβs law of heat conduction, heat flow Q is given by, when flow area is A, temperature difference is dt, thickness is dx and thermal conductivity is K:
Answer
C. Q = βKA(dt/dx)
94
The emissive power of black body per unit area per unit time varies :
Answer
D. Directly with fourth power of absolute temperature
A 17 227/2023
95
One Ton of refrigeration is equivalent to :
Answer
C. 3.5 kW
96
For the same operating temperature the COP of a heat pump equals :
Answer
B. COP of refrigerator + 1
97
A good refrigerant should have :
Answer
D. High latent heat of vaporisation and low freezing point
98
On a Psychometric chart relative humidity is represented by :
Answer
A. Curved line
99
Dew point depression represents the difference between :
Answer
D. Dry bulb temperature and dew point temperature
100
The capacity of a refrigerating machine is expressed as :
Answer
C. Rate of abstraction of heat from the space being cooled
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