1 You
are to over see arc welding of some machine fittings and find they are cadmium
plated. What you:
a)
Permit it to
proceed
b)
Permit it to
proceed with fume extraction
c)
Stop the
operation at once
d)
Advise the
welder to drink milk and proceed
2 What
two functions in arc welding must be in equilibrium to enable a stable arc to
be established?
a)
Arc voltage
b)
Current
c)
Wire/electrode
feed rate
d)
Metal
burn-off rate
3 In
MMA welding, what parameter is used for the control penetration into the base
material?
a)
Voltage
b)
Welding
speed
c)
Iron powders
in the coating
d)
Current
4 In
the welding of butt joint from one side, which of the following controls the
profile of the root bead?
a)
Root Face
b)
Bevel Angle
c)
Root Gap
d)
One of the
above
5 What
type of power source characteristic is required for manual welding?
a)
Constant
voltage
b)
Flat
Characteristic
c)
Drooping
Characteristic
d)
Motor
Generator
6 Which
of the following destructive tests would indicate the toughness of weld
metal/parent metal – HAZ.
a)
Macro
b)
Nick break
c)
Hardness
d)
Charpy vee
notch
7 Degreasing
components are essential for quality welding but some agents may:
a)
Cause
corrosion Problems
b)
Give off
Phosgene Gas
c)
Leave
Residues
d)
All of the
Above
8 Which
of the following chemical elements has the greater effect on the harden ability
of a steel plate?
a)
Molybdenum
b)
Chromium
c)
Titanium
d)
Carbon
9 In
MAG/CO2 welding, which parameters give the greatest control of weld
appearance during dip transfers or short-circuiting
welding?
a)
Wire
sick-out length
b)
Amperage
c)
Wire feed
speed
d)
Inductance
10 In
MMA welding, the slag produced can be varied to suit the welding position;
which type of slag would be required for welding in the HV position?
a)
Fluid
b)
Viscous
c)
None of the
above
d)
Semi fluid
11 The
weld metal deposits of manual metal arc electrode achieves its mechanical
strength through?
a)
The core
wire
b)
The flux
coating
c)
Iron powder
with the flux coating
12 What
constituent is needed in coating of electrode of an electrode to prevent
formation of porosity in welding of rimming steel?
a)
Iron powder
b)
Calcium
fluoride
c)
Silicon
d)
Calcium
carbonate
13 Welds
made with high heat inputs show a reduction in one of the following properties?
a)
Ductility
b)
Toughness
c)
Fatigue
strength
d)
Mechanical
strength
14 In
the welding of Austenitic pipe work, the borer is usually purged with Ar to?
a)
Prevent
formation of porosity in the weld
b)
Prevent
burn-through in the root run
c)
Prevent
oxidation of the rood bead
d)
Eliminate
the formation of H2
15 In
X-ray the quality of the radiograph negative is assessed by the?
a)
Density of
the Film
b)
IQI
indicator
c)
KVA
available
d)
Stand-off
distance
16 A
steel described, as QT will have improved tensile properties it
has?
a)
Had control
of chemical composition
b)
Been heat
treated
c)
Been quality
tested
d)
Been vacuum
melted
17 Which
one o the following steels would give rise to the formation of porosity when
autogenously welded with an arc process?
a)
Fully killed
steel
b)
Semi killed
steel
c)
Rimming
steel
d)
Fine grained
steel
18 In
submerged arc welding, the use of excessively high voltage would result in?
a)
Insufficient
flux melting
b)
Excessive
flux melting
c)
Slag removal
difficulties
d)
Spatter
19 The
use of cellulosic electrode is often made when welding the root pass of pipes
in the field. This is because?
a)
Hydrogen
control is needed
b)
Iron powder
in the electrode
c)
Higher arc
voltage can be obtained
d)
Shorter arc
length can be achieved
20 In
the welding of Austenitic stainless steels, the electrode and plate material
can be purchased with low carbon contents. The reason for this is to prevent?
a)
Cracking I
the HAZ
b)
The
formation of chromium carbides
c)
Cracking in
the weld metal
d)
Distortion
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