| Post Name | ASSISTANT MANAGER (MECHANICAL) - TRAVANCORE TITANIUM PRODUCTS LIMITED |
|---|---|
| Question Paper Code | 079/2021 |
| Category Code | 003/2020 |
| Date of Test | 9 August 2021 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Work done in a free expansion process is
Answer
A. Zero
2
The crystal structure of aluminium is
Answer
B. Face centred cubic
3
Delta iron occurs in the temperature range of
Answer
Question Cancelled
4
The number of degree of freedom of an eutectic point in a binary system according
to Gibbs phase rule is
Answer
A. 0
5
Which one of the following is the process to reļ¬ne the grains of metal after it has
been destroyed by cold working ?
Answer
C. Recrystalizing
6
The percentage of phosphorus in phosphor bronze is
Answer
A. 0.1
7
Machining of copper can be improved by adding
Answer
B. Sulphur
8
The Jominy test is used to ļ¬nd
Answer
B. Hardenability
9
In the polytropic process pvn = constant, if the value of n is inļ¬nity, the process is
termed as
Answer
A. Constant volume
10
The specimen in charpy impact test is held as
Answer
B. Simply supported beam
11
Dow metal contains
Answer
C. 90% magnesium and 9% aluminium with some copper
12
Cast iron contains
Answer
D. 2% to 4% carbon
13
The range of surface hardness that can be obtained by nitriding is
Answer
A. 1000 to 1100 VPN
14
A single-jet Pelton wheel has head 500 m and jet diameter 200 mm. Determine discharge through the jet if K_v = 0.98.
Answer
B. 3.04 mĀ³/s
15
A turbine is to operate under a head of 30m and the discharge is 10 m3/s. If the
turbine efļ¬ciency is 0.75. Determine the power generated by the turbine.
Answer
D. 3000 HP
16
Water is ļ¬owing through a nozzle ļ¬tted at the end of a pipe. The diameter of the
nozzle is 0.1m and the head of water at the centre of nozzle is 100 m. Determine
the velocity of ļ¬ow through nozzle if Cv = 0.95.
Answer
C. 42.08 m/s
17
The angle of taper of a draft tube is
Answer
A. Less than 8Ā°
18
Reynolds number is the ratio of
Answer
B. Inertial forces to viscous forces
19
Spouting velocity is
Answer
A. Ideal velocity of jet
20
A Francis turbine working at 300 rpm has a unit speed of 50 rpm. What is the effective
head under which this turbine can be operated ?
Answer
C. 36 m
21
The internal energy of an ideal gas is a function of
Answer
D. Temperature only
22
Discharge of a centrifugal pump is
Answer
A. Directly proportional to velocity of ļ¬ow
23
What will be the ratio of head loss of a laminar incompressible ļ¬ow in a horizontal
circular pipe with average velocity V and pipe diameter D to that with average velocity
2V and pipe diameter D/2 ? The ļ¬uid and pipe length are same.
Answer
C. 8
24
The boundary layer thickness of a lamina ļ¬ow over a ļ¬at plate at a distance of 0.25 m
from the leading edge is 8 mm. Then what will be the thickness at a distance of 0.75 m ?
Answer
A. 13.85
25
Water hammer in pipes takes place when
Answer
C. Flowing ļ¬uid is suddenly brought to rest by closing a valve
26
Which one is not a rotating machine ?
Answer
C. Jet pump
27
Why a Net Positive Suction Head (NPSH) is required for a hydraulic pump ?
Answer
D. To prevent cavitation
28
The maximum hydraulic efļ¬ciency of an ideal impulse turbine with blade angle A is
Answer
A. (1+cosA)/2
29
The overall efļ¬ciency of a Pelton turbine is 70%. What is the hydraulic efļ¬ciency if
the mechanical efļ¬ciency is 80% ?
Answer
B. 87.5%
30
Measurement of temperature is based on
Answer
A. Zeroth law of thermodynamics
31
Heat and work are
Answer
D. Path functions
32
The ratio of Cp/Cv for a gas with n degree of freedom is equal to
Answer
C. 1+(2/n)
33
Which of the following is an intensive property of a system ?
Answer
Question Cancelled
34
Speciļ¬c internal energy and speciļ¬c volume of a pure substance under 8MPa and
400Ā°C are 2864 kJ/kg and 0.03432 m3/kg respectively. What is its speciļ¬c enthalpy ?
Answer
A. 3138.56 kJ/kg
35
Gibbs free energy G is given by
Answer
B. G = H ā TS
36
A diathermic wall permits heat transfer by
Answer
D. All the three modes of heat transfer
37
For ductile materials, toughness is the measure of
Answer
C. Ability to absorb energy to fracture
38
The ultimate tensile strength of mild steel in the engineering stress strain curve refers to
Answer
B. Maximum stress
39
A measure of Rockwell hardness is the
Answer
A. Depth of penetration of indenter
40
The test for measuring the hardness of thin section is
Answer
C. Knoop hardness test
41
Estimate the welding speed for Aluminium (Speciļ¬c energy 2.9 J/mm3) when the
voltage is 40V and current is 200 A, cross sectional area of weld bead is 30 mm2
and welding efļ¬ciency is 80%.
Answer
B. 73.6 mm/s
42
Compared with other arc welding processes plasma arc welding has
Answer
D. All the above
43
SMAW is best suited for workpiece for a whole range of thickness of
Answer
Question Cancelled
44
Range of currents employed in SAW process single arc process is
Answer
A. 300 ā 2000 A
45
For electron beam welding, which of the following are used ?
Answer
C. Vacuum
46
Sonotrode in ultrasonic welding does the function of
Answer
B. Coupling between transducer and tip
47
Weld zone size and shape in friction welding is inļ¬uenced by
Answer
D. All the above
48
Find the heat dissipated by resistance welding of a 1mm thick workpiece if heat required
to melt the weld nugget is 380 J for a current of 5000 A and resistance 200 ļæ½A and
contact period of 0.1 S.
Answer
B. 120 J
49
In percussion welding the power is discharged within a span of
Answer
A. 1 ā 10 mS
50
In explosive welding the detonation speed is a function of
Answer
C. Both
51
Which of the following is not a rolling defect ?
Answer
D. Blow holes
52
Which of the following does not need additional ļ¬nishing process ?
Answer
C. Cold rolling
53
Forging defects of a component can cause
Answer
C. Both
54
Which of the following is not an advantage of cold extrusion over hot extrusion process ?
Answer
B. Less tooling stresses
55
Which of the following do not inļ¬uence quality and surface ļ¬nish in drawing ?
Answer
D. None of the above
56
Isentropic work done by a gas turbine is
Answer
B. Greater than actual work
57
For a multi-stage reciprocating compressor, work consumed is less in the case of
Answer
A. Isothermal compression process
58
According to Fourierās law Heat transfer increases proportional to increase in
Answer
D. All the above
59
Three metal walls of same cross-sectional area and conductivity ratio 1 : 2 : 4 transfer
heat at Q kJ/hr. If the walls are of same thickness, the temperature drops will be in
the ratio
Answer
C. 4 : 2 : 1
60
Methods to improve Brayton cycle efļ¬ciency are
Answer
A. Regeneration
61
Factors affecting auto ignition in an engine are
Answer
C. Both
62
The numbers used in free convection calculations of ļ¬uids are
Answer
A. Grashoff, Prandtl
63
The basic law of convection is
Answer
C. Newtonās law
64
The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is
1.45 ļæ½m. If the peak wavelength of emitted radiation changes to 2.90 ļæ½m, then the
temperature (in K) of the black body is
Answer
B. 1000
65
Consider an ideal vapor compression refrigeration cycle. If the throttling process
is replaced by an isentropic expansion process, keeping all the other processes
unchanged, which one of the following statements is true for the modiļ¬ed cycle ?
Answer
C. Coefļ¬cient of performance is higher than that of the original cycle
66
Which one of the following statements is correct for a superheated vapour ?
Answer
A. Its pressure is less than the saturation pressure at a given temperature
67
Which one of the following is a CFC refrigerant ?
Answer
C. R502
68
Which of the following has consistent effect on improving COP of simple refrigerating
cycle ?
Answer
A. Undercooling
69
According to Buckinghamās Pi theorem, the number of dimensionless groups to deļ¬ne
a problem equals
Answer
C. Difference between total number of variables and fundamental dimensions
70
Which is not true about steam jet refrigeration ?
Answer
B. It can be used below 0Ā°C
71
Two elements when joined in such a manner that the relative motion between them
is completely constrained is called
Answer
C. Kinematic pair
72
Which is the Kinematic Inversion of double slider crank chain ?
Answer
D. All of the above
73
Mobility of a statically indeterminate structure is
Answer
A. ā¤ā1
74
Universal joint is an example of
Answer
A. Lower pair
75
The Davis steering gear is not used because
Answer
C. It has sliding pairs
76
For maximum power transmission maximum belt tension Tmax is related to centrifugal
Tension Tc as
T Tc
Answer
D. 3Tc
77
In case of involute gears which of the following statement is correct ?
Answer
D. Pressure angle is constant throughout the teeth engagement
78
Choose the correct statement for safe design.
Answer
Question Cancelled
79
If effective tension of belt drive increased by 20%, on both tight side and slackside
of belt drive tension is 36, then the power transmitted is
Answer
D. not possible to ļ¬nd with this data
80
Tooth interference in an external involute spur gear pair can be reduced by
Answer
D. Increasing number of gear teeth
81
For power transmission commonly used tooth proļ¬le in gear drives are
Answer
B. An involute
82
Which of the following is classiļ¬ed as transmission dynamometer ?
Answer
Question Cancelled
83
The pressure angle for spur gears is kept small
Answer
C. Both
84
Gear train used in clocks is
Answer
B. Reverted gear train
85
Axial thrust is minimum in case of
Answer
Question Cancelled
86
For resistance spot welding of 1.5 mm thick steel sheet current required is on the
order of
Answer
B. 10000 A
87
The coupling used to connect two shafts with large angular misalignment is
Answer
B. Hookās joint
88
In the assembly design of shaft, pulley and key the weakest member is
Answer
B. Key
89
For manufacturing pipes which carry gas, what are the joining processes employed
as listed below ?
1. Rivetting 2) Welding 3) Bolts and Nuts
Answer
B. 2 alone
90
A helical spring has ānā number of turns, Coil Diameter āDā a second spring made
of same wire diameter and of same material has turns of diameter of 2D. If the
stiffness of ļ¬rst spring is āKā then stiffness of second spring is
Answer
B. K 4
91
Minimum number of teeth on a pinion of 20Ā° full depth system without interference is
Answer
Question Cancelled
92
For transmitting power in both direction screw thread adopted is
Answer
B. Square thread
93
In a rigid ļ¬anged coupling connecting two shafts transmitting power, bolts in coupling
are subjected to
Answer
A. Shear force and bending moment
94
When a load of 10 kN is applied on ball bearing, life of bearing is 8000 hours. If the
load is increased to 20 kN keeping all other conditions same, life of bearing will be
Answer
C. 1000
95
Distance between the centre lines of two rows of rivets is called
Answer
D. Pitch
96
Which type rivet head is used for the boiler plate riveting ?
Answer
D. Snap head
97
Lewis equation is applied
Answer
C. To weaker of the pinion and gear
98
Radius of friction circle in journal bearing increases with increase in
Answer
D. Radius of journal
99
In an involute gear of pressure angle āļæ½ā the ratio of pitch circle radius to base circle
radius is
Answer
B. Secļæ½
100
When shafts axes are at offset which type of gears are used ?
Answer
C. Hypoid gears
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