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