SAMPLE PAPER FOR BLOG ON viva-written-format-equal-opportunity.html
VIVA: WRITTEN FORMAT, EQUAL OPPORTUNITY EVALUATION
PROCEDURE (SAMPLE)
Programme |
Course No.
& Name |
Semester, Session |
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MM: 100 |
Practical Quiz |
Venue |
Time |
Date |
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Name: |
Roll No.: |
Signature: |
- True / False statements. Answer all statements by checking the
appropriate box, ‘T’ for True, or ‘F’ for False.
- ONE mark would be awarded for each correct answer, but TWO marks
would be deducted (-2) for each wrong answer.
- No marks would be deducted for unattempted statements or skipped statements.
Therefore ATTEMPT ONLY WHEN SURE. Please note, engineering education has
no room for guessing.
# |
Statement |
T/F |
1. |
Metal
transfer through the arc stream varies greatly with different gas shielding. |
T |
2. |
The
stickout is the distance between the end of the contact tube and the tip of
the welding arc in semi-automatic welding processes. |
T |
3. |
At the same
weld speed, decrease in electrode size will increase the cross-sectional area
of weld bead in SMAW process. |
F |
4. |
Welding in
‘Vertical-up’ direction is more difficult than vertical-down direction in arc
welding. |
T |
5. |
Primary of
the transformer power source can’t be connected to DC suppy. |
F |
6. |
A manual
metal arc covered electrode can have a metal deposition efficiency greater
than 130% |
T |
7. |
Weld bead penetration
increases with increase in thermal conductivity of the weld metal. |
F |
8. |
Moisture
is one of the major causes of cold cracking in welds. |
T |
9. |
DCEP- is
the specific direction of current flow through a welding circuit. |
T |
10. |
Inverter-Power
source is one, which converts AC-DC-AC. |
T |
11. |
Oxygen or
carbon dioxide additions to the inert shielding gas stabilizes the arc, but
usually results in increased fume formation rates. |
T |
12. |
SAW has
the lowest fume formation rate amongst all the arc processes,. |
T |
13. |
Electrode
size is nominated by diameter of the covered core wire. |
T |
14. |
Increase
in carbon weight percentage will increase ductility of steels. |
F |
15. |
The
droopers are commonly known as constant voltage welding machines. |
F |
16. |
The
portion of the base metal which doesn’t melt during arc welding is called
fusion zone. |
F |
17. |
A cavity formed by gas entrapment during welding is
called inclusion. |
F |
18. |
Heat
Affected Zone stand for the portion of the base metal affected by the heat of
the welding arc but doesn’t experience melting. |
T |
19. |
The
penetration can be reduced by simple manipulation of the arc gap, at the same
welding current. |
T |
20. |
Micro-hardness
testing is best suitable for materials with very fine multi-phase
microstructure. |
T |
21. |
Ceramic
materials can be tested by Vickers hardness testing. |
T |
22. |
SMAW is
the preferred process for reactive metals. |
F |
23. |
Change in
type of shielding gas will affect the weld bead geometry. |
T |
24. |
‘Drag
electrode’ is a term used in SMAW process. |
T |
25. |
SMAW is
the preferred process for zinc and zirconium. |
F |
26. |
The maximum
allowable current is determined by the length of the stick electrode. |
F |
27. |
Metal
fumes of some metals are carcinogenic. |
T |
28. |
Any increase
in arc voltage with constant current will increase the weld bead width in SAW
process. |
T |
29. |
DCEP is
also known as ‘straight polarity’. |
F |
30. |
Arc length
increases with the increase in arc voltage. |
T |
31. |
Heavy
coated iron powder electrodes are designed for high deposition welding. |
T |
32. |
Low
hydrogen electrodes are used to weld hardenable steels. |
T |
33. |
DCEN is
preferable than DCEP for surfacing process with SMAW process. |
F |
34. |
Toughness
of mild steel is more at –20 °C than at
30°C. |
F |
35. |
Autogenous welds are not possible with GTAW. |
F |
36. |
Post weld
cleaning is more in GMAW process. |
F |
37. |
GTAW gives the best quality welding compared to GMAW
and SAW. |
T |
38. |
GMAW is
best suitable for inaccessible positional welding. |
F |
39. |
The arc in helium is more penetrating than Argon. |
T |
40. |
GTAW is a preferred process for thicker sections. |
F |
41. |
GMAW is a
recommended process for outdoor welding. |
F |
42. |
Operator
duty cycle of the welding power source is greater in SMAW process than that
of GMAW process. |
F |
43. |
Change in type of shielding gas will affect the weld
pool shape at the same arc voltage. |
T |
44. |
Electrodes with different tip shapes in GTAW affect
the weld quality. |
T |
45. |
The voltage
drop across the welding cables is lower in case of AC supply when compared to
DC supply. |
T |
46. |
CO2
is the only reactive gas that is used as a shielding gas in GMAW. |
T |
47. |
Droopers
are the choice when using large diameter covered electrodes with higher
coating ratios in SMAW. |
T |
48. |
OCV will
remain constant on both during and after welding in SMAW. |
F |
49. |
The maximum
temperature that is reached in SMAW arc is around 5000 ~ 6000 °C. |
T |
50. |
Charpy V
notch test is conducted for determining the hardness of the composite metal. |
F |
51. |
Cellulosic
electrodes are the most efficient electrodes for high carbon steels. |
F |
52. |
The study
of weldability is usually confined to the weld metal of the joint. |
F |
53. |
The best
welding technique for obtaining sound weld for any material is the one that
gives maximum linear heat input. |
F |
54. |
Medium
carbon steels have better weldability than mild carbon steels. |
F |
55. |
High
hardenable materials have low weldability. |
T |
56. |
Larger the
weldment reinforcement, better the rigidity and strength of the joint. |
F |
57. |
Stress
relieving may be necessary for Q&T steels to prevent cracking. |
T |
58. |
The
intensity of welding heat source is distributed uniformly over the contact
area. |
F |
59. |
The most
difficult material to weld is low carbon steel. |
F |
60. |
High heat
input and slower cooling always increase the amount of dilution. |
T |
61. |
The main
cause for HAZ cracking in base metal is lack of shielding. |
F |
62. |
Pre / post
weld heating are the common methods applied to control the weld metal
dilution. |
F |
63. |
The volume
of deposited metal is greater in single ‘V’ groove joint than a double ‘V’
groove joint. |
T |
64. |
Vertical
down welding is an example of “out of position welding”. |
T |
65. |
Increase
in welding speed during SAW reduces cooling rate. |
F |
66. |
Weldability
is reduced by the presence of Sulphur and Phosphorous in the base metal. |
T |
67. |
Unequal
leg size is a defect for fillet welds. |
T |
68. |
The
intensity of heat from a welding heat source cannot generally be expressed as
a precise number. |
T |
69. |
Self-shielded
flux cored arc welding (FCAW-S) can’t be used for welding of cross country
pipelines. |
F |
70. |
With the
increase in viscosity of molten metal there are more chances of lack of
fusion. |
T |
71. |
Sulphur
increases the cold cracking susceptibility in the weld metal. |
F |
72. |
Increase
in carbon weight percentage will decrease the melting temperature and
ductility in steels. |
T |
73. |
Strength
to weight ratio of pure aluminum is more than high strength steel. |
T |
74. |
If you
double the amperage in a given welding cable then the heat produced will also
be doubled. |
F |
75. |
If a
welding cable produces too much heat, the remedy would be to reduce the diameter
of the cable. |
F |
76. |
Cold
cracking defect is associated with phosphorous presence in weld metal. |
F |
77. |
Increase
in welding current during welding causes increase in weld penetration. |
T |
78. |
Charpy
impact test is an example of NDT. |
F |
79. |
Cracks
occur because the stress at the point in the weldment exceeds the yield
strength. |
T |
80. |
DC of the
equivalent voltage and amperage is more dangerous than of an A.C. line in
welding. |
T |
81. |
The
delayed cracking in welds is due to the presence of moisture during welding. |
T |
82. |
Phosphorous
increases the hot cracking susceptibility in base metal |
T |
83. |
It is
difficult to define the area of contact between the heat source and the work
piece in welding. |
T |
84. |
Inter-pass
cleaning is done for avoiding slag inclusion. |
T |
85. |
Presence
of Carbon in iron is an example of substitutional solid solution. |
F |
86. |
In SAW
process increase in arc voltage with constant welding current will increase
the flux consumption. |
T |
87. |
Flame
hardening is a case hardening process. |
T |
88. |
Arc
welding can produce Ozone. |
T |
89. |
Heat
balance is not important criteria in resistance welding materials of
different electrical conductivities. |
F |
90. |
Super
conductivity is a phenomenon associated with metals at room to elevated
temperatures. |
T |
91. |
The arc in
Helium is more penetrating than Argon. |
T |
92. |
The
droopers are commonly known as constant voltage welding machines |
F |
93. |
Gas is
also used as a coolant in GTAW process. |
T |
94. |
GMAW is a
better process for reactive materials than GTAW. |
F |
95. |
The best
welding technique for obtaining sound weld for any material is the one that
gives maximum linear heat input. |
F |
96. |
Medium
carbon steels have better weldability than mild carbon steels. |
F |
97. |
Chlorinated
hydrocarbons should never be used for degreasing the joint surfaces during
arc welding. |
T |
98. |
Larger the
weldment reinforcement, better the rigidity and strength of the joint. |
F |
99. |
Deadly
nerve gas Phosgene can also be produced during arc welding if proper
precautions are not taken. |
T |
100.
|
Infrared
radiation is more harmful than UV radiation. |
F |
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