| Post Name | Overseer/ Draftsman (Mechanical) Gr I, Draftsman Gr II (Mechanical Engineering), Plant Engineer (Mechanical), Senior Driller, Purchase Assistant etc |
|---|---|
| Question Paper Code | 065/2023 |
| Category Code | 272/2020, 411/2020, 412/2020, 514/2021, 254/2022, 314/2022, 404/2022, 676/2022 |
| Date of Test | 9 June 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
A cube of 1 m side has weight 11000 N in air. What will be its weight in water
(g = 10 m/s2) ?
Answer
D. 1000 N
2
If one litre of a fluid has a mass of 6.5 kg then its specific gravity is
Answer
B. 6.5
3
In an inclined plane submerged in water, the centre of pressure is located
Answer
C. below the centroid
4
The ratio of gauge pressures between two points located respectively at depths of
0.4 m and 8 m below water level in a tank is
Answer
A. 1 : 20
5
The type of flow in which the velocity at any given time does not change with
respect to space is called
Answer
A. Uniform flow
6
A venturimeter is preferred to an orifice plate because
Answer
C. Energy loss is less
7
Hydraulic radius of a Notch is equal to
Answer
B. Area divided by the wetted perimeter
8
The unit of Chezyβs constant βCβ in the Chezyβs formula is
Answer
D. m1/2/s
9
Which of the following head loss is significant in a pipe flow ?
Answer
B. loss of head due to friction
10
In fluid mechanics, the continuity equation is a mathematical statement embodying
the principle of
Answer
D. Conservation of mass
11
Force exerted by a jet of water impinging on a moving flat plate is
Answer
A. Οa(V-u)2
12
A series of normal flat vanes are mounted on the periphery of a wheel, the vane
speed being V. For maximum efficiency the speed of the liquid jet striking the vanes
should be
Answer
D. 2V
13
The speed ratio of a Pelton wheel varies from
Answer
C. 0.45 to 0.5
14
Which relation is incorrect ?
Answer
B. Francis Turbine β Impulse Turbine
15
The hydraulic efficiency of a turbine is the ratio of
Answer
B. mechanical energy supplied by the rotor and hydrodynamic energy available
from the fluid
16
In reaction turbine, draft tube is used
Answer
C. To convert the kinetic energy to flow energy by a gradual expansion of the flow
cross-section
17
When a centrifugal pump is started, there will be no flow of water until the pressure
rise in the impeller is large enough to overcome the
Answer
A. manometric head
18
Slip of reciprocating pump becomes negative when
Answer
D. Actual discharge is more than theoretical discharge
19
In a centrifugal pump the liquid enters the pump
Answer
A. at the centre
20
Indicator diagram of a reciprocating pump is a graph between
Answer
D. Pressure in cylinder vs Stroke length
21
Open system is one in which
Answer
C. Both energy and mass transfer
22
Properties which are independent of the mass in the system are known as
Answer
B. Intensive properties
23
A series of state changes such that the final state is identical with the initial state is
known as
Answer
A. Thermodynamic cycle
24
First law of thermodynamics is a formulation of
Answer
A. Principle of conservation of energy
25
Heat transferred to the system at constant volume
Answer
B. Increases internal energy of the system
26
Specific Enthalpy is
Answer
A. Intensive property of the system
27
Work is said to be a
Answer
A. High grade energy
28
COP of Heat pump is
Answer
C. COP of refrigerator + 1
29
Carnot cycle has
Answer
A. Two reversible isotherms and two reversible adiabatic process
30
Entropy of an isolated system can never
Answer
B. decrease
31
The main content of a fuel are
Answer
D. Carbon and Hydrogen
32
Bomb calorimeter is used to find
Answer
B. Higher calorific values
33
If mg represents mass of dry steam and mf represents mass of water in suspension,
dryness fraction of steam is
mg mf
Answer
A. βββ
34
Super heating of steam before entering for isentropic expansion in Rankine cycle
Answer
C. Both
35
Air refrigerator works on
Answer
D. Bell-Coleman Cycle
36
In case of impulse steam turbine
Answer
A. Velocity increases at nozzle and reduces at moving blades
37
In case of reaction steam turbine degree of reaction is the ratio of
Answer
C. heat drop at moving blade to total heat drop at moving and fixed blade
38
Compounding of impulse steam turbine is done to
Answer
D. All of the above
39
Gas turbines work based on
Answer
A. Joule Cycle
40
Inter cooler in gas turbine
Answer
B. Reduce efficiency
41
The centre of gravity of a solid hemisphere of radius r lies at a distance of
Answer
A. (3/8)r from the base
42
The area of a section is in mm2 and the distance of the centre of area from a line is in mm,
then the units of the moment of inertia of the section about the line is expressed in
Answer
D. mm4
43
The shear force and bending moment are zero at the free end of a cantilever beam,
if it carries a
Answer
Question Cancelled
44
A beam extending beyond the supports is called
Answer
Question Cancelled
45
For a given material, the modulus of rigidity is 100 GPa and the Poissonβs ratio is
0.25. The value of modulus of elasticity is
Answer
D. 250 GPa
46
Within elastic limit in a loaded material, stress is
Answer
B. directly proportional to strain
47
When a body is subjected to three mutually perpendicular stresses of equal intensity,
the ratio of direct stress to the corresponding volumetric strain is known as
Answer
D. Bulk modulus
48
A steel bar is heated from 15Β°C to 40Β°C and it is free to expand. The bar will
induce
Answer
C. No stress
49
When a solid shaft is subjected to torsion, the shear stress induced in the shaft at
its centre is
Answer
A. Zero
50
A column of length I is hinged at its both ends. Its equivalent length will be equal to
Answer
B. I
51
The most abundant metal in the earthβs crust is
Answer
A. Aluminium
52
Which of the following is the primary element used for making stainless steel alloy ?
Answer
C. Chromium
53
The heat treatment process used for softening hardened steel is
Answer
D. Tempering
54
The lower critical temperature for all steel is
Answer
B. 723Β°C
55
Heat treatment of metals is necessary
Answer
Question Cancelled
56
The process of heating steel to about 40Β°C above the upper critical temperature and
cooling it in still air to room temperature is known as
Answer
C. Normalizing
57
Which of the following has a fine gold colour and is used for imitation jewellery ?
Answer
B. Aluminium bronze
58
Alloy of copper and zinc is known as
Answer
A. Brass
59
The plastics are
Answer
D. Insulators
60
Which of the following carbides are used for cutting tools ?
Answer
B. Tungsten carbide
61
Following hammer is made up of wood
Answer
C. mallet
62
Which of the following is not included in scrap used for melting ?
Answer
B. Billets
63
Projection welding is a
Answer
A. multi spot welding process
64
Scribing block is used to
Answer
C. locate the centres of round bars
65
The lip angle of a single point tool is usually
Answer
C. 60Β° to 80Β°
66
A drill considered as a cutting tool having zero rake, is known as
Answer
B. Straight fluted drill
67
The process of removing metal by a cutter which is rotated against the direction of
travel of the workpiece
Answer
D. Upmilling
68
Buffing wheels are made of
Answer
A. Cotton fabric
69
In lapping operation, the amount of metal removed is
Answer
C. 0.005 to 0.01 mm
70
The tool life increases with the
Answer
D. Increase in end cutting edge angle
71
In first angle projection, if the both projections of a point lie in reference line (xy-line) then
Answer
B. Point will be both in HP and in VP
72
If a line is parallel to any one of the reference planes and inclined to the other then
Answer
C. Both
73
Which is/are not the central conic/s ?
Answer
B. Parabola
74
In the isometric projection of a cube how many non isometric lines have true lengths
of the sides of the cube ?
Answer
Question Cancelled
75
In the cavalier oblique projection of a cube the angle between the plane of projection
and the line of projection is
Answer
B. 45Β°
76
A screw which has threads at both ends is called
Answer
C. Stud
77
Strap end of a connecting rod is usually connected by
Answer
A. Cotter joint
78
Which type of rivet heads are used for ship building ?
Answer
Question Cancelled
79
When the power transmitted in a belt drive is maximum, then
Answer
B. (1/3) of the maximum tension is absorbed as centrifugal tension
80
Herringbone gears are
Answer
C. double helical gears
81
In an IC engine the material/s for the inlet valve is/are
Answer
B. Nickel-Chrome steel
82
In a fuel injector which type of nozzle/s is/are used for pre-combustion and for air
cell engines ?
Answer
C. Pintle type
83
In four cylinder in line engine the best firing order/s is/are
Answer
A. Either 1β2β4β3 or 1β3β4β2
84
The difference of the work done in expelling the exhaust gases and the work done
by the fresh charge during suction stroke in an IC engine is called
Answer
B. Pumping loss
85
Factors which favour the elimination of knock in the C I engine are
Answer
A. Short ignition delay period and low self ignition temperature of the fuel
86
Externally fired boiler is
Answer
D. Babcock and Wilcox boiler
87
Example for once through boiler is
Answer
A. Benson boiler
88
Function of junction valve in a boiler is
Answer
B. Shut off steam or regulate the flow of steam to requirements
89
Which boiler accessory is used for feed water heating by utilizing the heat of waste
furnace gases ?
Answer
B. Economizer
90
High steam and low water safety valve is suitable for
Answer
A. lancashire boiler and Cornish boiler
91
Thermal conductivity for a given material
Answer
D. Vary with structure, humidity, pressure and temperature
92
Convection heat transfer involves
Answer
A. Conduction and mixing motion
93
When two bodies taking part in heat transfer, at zero thermal potential
Answer
C. Radiation continues
94
Thermal radiation involves
Answer
Question Cancelled
95
For a perfect black body
Answer
B. Absorptivity=1, Reflectivity=0, Transmissivity=0
96
Energy performance ratio of a heat pump is
Answer
B. Greater than 1
97
1 ton of refrigeration is equal to
Answer
B. 3.5 kW
98
Ammonia refrigerants are commonly used with
Answer
A. Iron and Steel
99
In a psychrometric chart constant specific volume lines are
Answer
D. Inclined straight lines
100
Weight of water vapour present per kg of dry air is called
Answer
Question Cancelled
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