CWB Level 2 Welding Inspector Exam 2025 – Real
Questions & Answers (Graded A+)
Which of the following metals has the lowest electrical resistivity?
A aluminum
B. tungsten
C. copper
D. iron
C. copper
What is the purpose of an inverter?
A. to convert AC current to DC current of the same frequency
B. to convert DC current to high frequency AC current
C. to convert AC current to DC current
D. to convert electrode positive to electrode negative
B. to convert DC current to high frequency AC current
How is power flow analyzed in alternating current circuits?
,A. AC circuits can be evaluated the same as DC circuits when RMS values of
voltage
and current are used
B. when analysing AC circuits, inductive and capacitive reactance must be
included
C. average current in an AC circuit is zero and therefore no work is done
D. the peaks and valleys of sine wave curves balance to zero with the load
C. average current in an AC circuit is zero and therefore no work is done
Which of the following methods is commonly used to control the output of a
transformer?
A. an auxiliary power supply which feeds the secondary as required
B. a saturable reactor in series with the output
C. resistance placed in parallel with the primary of the transformer
D. taps on the secondary of the transformer
D. taps on the secondary of the transformer
A transformer type welding power source without a rectifier outputs what type of
current?
A. direct current
B. alternating current
C. high frequency current
,D. pulsed direct current
B. alternating current
When gas tungsten arc welding steels electrode polarity is most commonly;
A. electrode positive
B. electrode negative
C. alternating current
D. electrode square wave
B. electrode negative
A disadvantage of SCR control is that the output is very 'choppy'. How is the
output made more suitable for welding?
A. the output is smoothed out by the addition of capacitors
B. the large inductor or choke will be added to the circuit
C. the output from an SCR bridge is smooth enough for welding purposes
D. the diodes added to all SCR controlled machines to prevent "choppy" output
A. the output is smoothed out by the addition of capacitor
During arc welding there is a zone adjacent to the weld metal that reaches high
temperatures but does not melt. What is the name of this region?
, Heat Affect Zone (HAZ)
In parallel electrical circuits, the voltage across each resistor is the same since each
path is connected to the same voltage source. Select the correct statement.
A. in each parallel path the resistance must be equalized to create equal voltage.
B. the current flowing in each parallel path must be the same as the voltage.
C. the current flowing in each parallel path depends on the resistance in each path
D. the current flowing in each parallel path depends on the capacitance in each
path
C. the current flowing in each parallel path depends on the resistance in each path
Welding is a joining process that by definition requires:
The application of either heat or pressure
The duty cycle of a welding power supply is based upon delivering its rated output
for a
given number of minutes. Which of the following statements is correct.
A. a 300 amp/60% duty cycle machine is rated to deliver 300 amps for 6 minutes
in a ten minute period
B. a 300 amp/30% duty cycle machine is rated to deliver 300 amps in a ten minute
period
Questions & Answers (Graded A+)
Which of the following metals has the lowest electrical resistivity?
A aluminum
B. tungsten
C. copper
D. iron
C. copper
What is the purpose of an inverter?
A. to convert AC current to DC current of the same frequency
B. to convert DC current to high frequency AC current
C. to convert AC current to DC current
D. to convert electrode positive to electrode negative
B. to convert DC current to high frequency AC current
How is power flow analyzed in alternating current circuits?
,A. AC circuits can be evaluated the same as DC circuits when RMS values of
voltage
and current are used
B. when analysing AC circuits, inductive and capacitive reactance must be
included
C. average current in an AC circuit is zero and therefore no work is done
D. the peaks and valleys of sine wave curves balance to zero with the load
C. average current in an AC circuit is zero and therefore no work is done
Which of the following methods is commonly used to control the output of a
transformer?
A. an auxiliary power supply which feeds the secondary as required
B. a saturable reactor in series with the output
C. resistance placed in parallel with the primary of the transformer
D. taps on the secondary of the transformer
D. taps on the secondary of the transformer
A transformer type welding power source without a rectifier outputs what type of
current?
A. direct current
B. alternating current
C. high frequency current
,D. pulsed direct current
B. alternating current
When gas tungsten arc welding steels electrode polarity is most commonly;
A. electrode positive
B. electrode negative
C. alternating current
D. electrode square wave
B. electrode negative
A disadvantage of SCR control is that the output is very 'choppy'. How is the
output made more suitable for welding?
A. the output is smoothed out by the addition of capacitors
B. the large inductor or choke will be added to the circuit
C. the output from an SCR bridge is smooth enough for welding purposes
D. the diodes added to all SCR controlled machines to prevent "choppy" output
A. the output is smoothed out by the addition of capacitor
During arc welding there is a zone adjacent to the weld metal that reaches high
temperatures but does not melt. What is the name of this region?
, Heat Affect Zone (HAZ)
In parallel electrical circuits, the voltage across each resistor is the same since each
path is connected to the same voltage source. Select the correct statement.
A. in each parallel path the resistance must be equalized to create equal voltage.
B. the current flowing in each parallel path must be the same as the voltage.
C. the current flowing in each parallel path depends on the resistance in each path
D. the current flowing in each parallel path depends on the capacitance in each
path
C. the current flowing in each parallel path depends on the resistance in each path
Welding is a joining process that by definition requires:
The application of either heat or pressure
The duty cycle of a welding power supply is based upon delivering its rated output
for a
given number of minutes. Which of the following statements is correct.
A. a 300 amp/60% duty cycle machine is rated to deliver 300 amps for 6 minutes
in a ten minute period
B. a 300 amp/30% duty cycle machine is rated to deliver 300 amps in a ten minute
period
