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CWB Level 2 Study Modules 4-5-6-7-8--22 QUESTIONS AND ANSWERS RATED A+ 2024/2025
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CWB Level 2 Study Modules 4-5-6-7-8--22 QUESTIONS AND ANSWERS RATED A+ 2024/2025
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CWB Level 2 Study Modules4-5-6-7-8-9-12-17-18-19-22
During arc welding there may be a region adjacent to the weld steel that reaches high
temperatures but does now not soften. What is the call of this area? - ANSHeat Affect Zone
(HAZ)
In parallel electric circuits, the voltage across each resistor is the identical for the reason that
every course is hooked up to the same voltage supply. Select an appropriate statement.
A. In every parallel route the resistance need to be equalized to create identical voltage.
B. The present day flowing in every parallel path need to be the same as the voltage.
C. The modern-day flowing in every parallel course depends at the resistance in each course
D. The cutting-edge flowing in each parallel path depends on the capacitance in each course -
ANSC. The modern-day flowing in every parallel direction relies upon on the resistance in each
route
Welding is a becoming a member of manner that via definition calls for: - ANSThe application of
both warmth or stress
The obligation cycle of a welding electricity supply is based totally upon handing over its rated
output for a
given number of minutes. Which of the following statements is accurate.
A. A three hundred amp/60% responsibility cycle gadget is rated to supply three hundred amps
for 6 mins in a ten minute period
B. A 300 amp/30% responsibility cycle system is rated to supply 300 amps in a 10 minute length
C. A 250 amp/30% duty cycle device is rated to deliver 250 amps for 30 minutes separated by
way of 10 mins at rest
D. A three hundred amp/60% duty cycle device is rated to supply 500 amps most for 6 mins in a
10 minute duration - ANSA. A 300 amp/60% duty cycle system is rated to supply three hundred
amps for six mins in a ten minute period
Conventional transformer-rectifiers;
A. Convert direct current into alternating contemporary
B. Convert alternating current into direct current
C. Convert alternating modern-day into pulsed contemporary
D. Convert direct modern into pulsed contemporary - ANSB. Convert alternating present day
into direct contemporary
,A traditional diode positioned in a circuit lets in the passage of contemporary in one direction
handiest. A silicon managed rectifier(SCR) operates barely in a different way. How does it
paintings?
A. An SCR conducts present day in each directions till grew to become on and contemporary
drift is then avoided
B. An SCR is non-conductive till turned onland then allows contemporary to flow in each
instructions
C. An SCR is non-conductive until became on, allowing cutting-edge to glide in a single path
handiest until the float of cutting-edge stops
D. An SCR is a completely unique rectifying device which permits only alternating c1:1rrent to
float until became off - ANSC. An SCR is non-conductive till became on, permitting cutting-edge
to go with the flow in a single path only till the drift of cutting-edge stops
What is the time period for voltage measured throughout the output terminals of a welding
system while no current is being drawn?
A. Diode voltage
B. Operating voltage
C. Open circuit voltage
D. Terminal voltage - ANSC. Open circuit voltage
A 60% duty cycle means that the strength deliver can supply its rated output for:
A 60% of the rated output best
B. 60% over the rated output observed with the aid of four mins at rest
C. 6 mins at relaxation observed with the aid of four mins at rated output
D. 6 minutes at rated output observed by means of 4 minutes at relaxation - ANSD. 6 minutes at
rated output accompanied by means of 4 mins at relaxation
The DC output of a unmarried segment power supply may be "ripply" and does now not produce
the friendliest DC arc. How is that this trouble triumph over?
A. Single phase electricity components produce the smoothest DC of all common machines
B. A 3rd transformer is brought to the output circuit to clear out instability
C. A capacitor or capacitor financial institution is delivered to the output circuit
D. A 'twin' rectifier bridge is used to clear out the transformer output - ANSC. A capacitor or
capacitor bank is delivered to the output circuit
One of the most effective approaches of controlling the output of a welding transformer is to
exchange
the performance of coupling among the number one and secondary coils. How can this be
carried out?
A slide a chunk of wooden among the number one and the secondary coils
B. Design the transformer with both a shifting middle or shifting primary coils
C. Layout the transformer with some of taps to pick out distinctive output curves
D. Use the timed firing of SCR's to manipulate total conduction time - ANSB. Design the
transformer with either a shifting center or shifting number one coils
,When deciding on between AC and DC output;
A. The process generally determines the form of cutting-edge
B. Excessive modern output machines are always both AC/DC
C. DC is usually used for extremely excessive output applications
D. Maximum components are prepared with constant voltage/steady contemporary options -
ANSA. The process generally determines the type of contemporary
Which of the following metals has the bottom electrical resistivity?
A aluminum
B. Tungsten
C. Copper
D. Iron - ANSC. Copper
What is the reason of an inverter?
A. To transform AC cutting-edge to DC present day of the same frequency
B. To convert DC cutting-edge to high frequency AC modern-day
C. To convert AC modern to DC present day
D. To convert electrode fantastic to electrode negative - ANSB. To convert DC current to
excessive frequency AC present day
How is strength glide analyzed in alternating cutting-edge circuits?
A. AC circuits may be evaluated the same as DC circuits whilst RMS values of voltage
and modern-day are used
B. Whilst analysing AC circuits, inductive and capacitive reactance must be blanketed
C. Common present day in an AC circuit is zero and consequently no paintings is finished
D. The peaks and valleys of sine wave curves balance to zero with the load - ANSC. Common
contemporary in an AC circuit is 0 and consequently no paintings is carried out
Which of the subsequent techniques is typically used to govern the output of a transformer?
A. An auxiliary electricity deliver which feeds the secondary as required
B. A saturable reactor in collection with the output
C. Resistance located in parallel with the primary of the transformer
D. Faucets on the secondary of the transformer - ANSD. Faucets at the secondary of the
transformer
A transformer kind welding strength supply with out a rectifier outputs what type of present day?
A. Direct cutting-edge
B. Alternating cutting-edge
C. High frequency modern-day
D. Pulsed direct present day - ANSB. Alternating present day
When gas tungsten arc welding steels electrode polarity is most typically;
A. Electrode fine
, B. Electrode poor
C. Alternating contemporary
D. Electrode square wave - ANSB. Electrode terrible
A disadvantage of SCR manage is that the output could be very 'uneven'. How is the output
made more appropriate for welding?
A. The output is smoothed out by way of the addition of capacitors
B. The huge inductor or choke could be brought to the circuit
C. The output from an SCR bridge is smooth enough for welding purposes
D. The diodes delivered to all SCR managed machines to save you "choppy" output - ANSA.
The output is smoothed out by way of the addition of capacitor
Gas tungsten arc and plasma arc welding power resources are typically designed with high
frequency gadgets. What does the high frequency unit do?
A. Increases heat input due to the multiplied frequency which increases the overall time
at high modern flow
B. Outputs high voltage, low cutting-edge to create and hold a strong conductive direction for
the flow of power
C. Decreases the cleansing motion created by electrode terrible polarity found in
alternating cutting-edge arcs
D. Outputs balanced modern flow among electrode high quality and electrode terrible
half of cycles - ANSB. Outputs excessive voltage, low contemporary to create and preserve a
strong conductive path for the go with the flow of electricity
Gases aren't typically electrically conductive. To start an arc;
A. Requires high voltage
B. Requires excessive inductance
'C. Calls for excessive contemporary
D. Requires AC energy - ANSA. Calls for high voltage
What voltage is required to reason 5 amps of modern-day to go with the flow via a resistance of
twenty-two ohms?
A. A hundred and ten volts
B. Zero.22 volts
C. 4.4 volts
D. Five volts - ANSA. 110 volts
What kind of output is normally required for Gas Tungsten Arc Welding?
A. Consistent voltage
B. Excessive frequency
C. Low strength factor
D. Low responsibility cycle
E. Steady cutting-edge - ANSE. Constant present day
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