CWB Level 2 Exam Questions and Answers-
Complete Real Exam
Question 1
To measure the strength of a welded joint what mechanical test would you prescribe?
a) A transverse weld tension test.
b) A charpy test.
c) A CTOD test.
d) An all weld metal tension test.
e) A side bend test.
Correct Answer
a) A transverse weld tension test.
Page 1 of 397
,Question 2
The mechanical test used to determine the ability of a material to resist failure by
brittle fracture requires the use of:
a) A tensile test specimen.
b) A bend test specimen.
c) A compression test specimen.
d) An impact test specimen.
e) A spectrographic test.
Correct Answer
d) An impact test specimen.
Question 1
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
Correct Answer
C. the current flowing in each parallel path depends on the resistance in each
path
Page 2 of 397
,Question 2
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
C. a 250 amp/30% duty cycle machine is rated to deliver 250 amps for 30
minutes separated by 10 minutes at rest
D. a 300 amp/60% duty cycle machine is rated to deliver 500 amps maximum
for 6 minutes in a ten minute period
Correct Answer
A. a 300 amp/60% duty cycle machine is rated to deliver 300 amps for 6
minutes in a ten minute period
Question 3
Conventional transformer-rectifiers;
A. convert direct current into alternating current
B. convert alternating current into direct current
C. convert alternating current into pulsed current
D. convert direct current into pulsed current
Correct Answer
B. convert alternating current into direct current
Page 3 of 397
, Question 4
A conventional diode placed in a circuit allows the passage of current in one
direction only. A silicon controlled rectifier(SCR) operates slightly differently.
How does it work?
A. an SCR conducts current in both directions until turned on and current flow
is then prevented
B. an SCR is non-conductive until turned onland then allows current to flow in
both directions
C. an SCR is non-conductive until turned on, allowing current to flow in one
direction only until the flow of current stops
Correct Answer
C. an SCR is non-conductive until turned on, allowing current to flow in one
direction only until the flow of current stops
Question 5
What is the term for voltage measured across the output terminals of a welding
machine when no current is being drawn?
A. diode voltage
B. operating voltage
C. open circuit voltage
D. terminal voltage
Correct Answer
C. open circuit voltage
Question 6
A 60% duty cycle means that the power supply can deliver its rated output for:
A 60% of the rated output only
B. 60% over the rated output followed by 4 minutes at rest
C. 6 minutes at rest followed by 4 minutes at rated output
D. 6 minutes at rated output followed by 4 minutes at rest
Correct Answer
D. 6 minutes at rated output followed by 4 minutes at rest
Page 4 of 397
Complete Real Exam
Question 1
To measure the strength of a welded joint what mechanical test would you prescribe?
a) A transverse weld tension test.
b) A charpy test.
c) A CTOD test.
d) An all weld metal tension test.
e) A side bend test.
Correct Answer
a) A transverse weld tension test.
Page 1 of 397
,Question 2
The mechanical test used to determine the ability of a material to resist failure by
brittle fracture requires the use of:
a) A tensile test specimen.
b) A bend test specimen.
c) A compression test specimen.
d) An impact test specimen.
e) A spectrographic test.
Correct Answer
d) An impact test specimen.
Question 1
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
Correct Answer
C. the current flowing in each parallel path depends on the resistance in each
path
Page 2 of 397
,Question 2
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
C. a 250 amp/30% duty cycle machine is rated to deliver 250 amps for 30
minutes separated by 10 minutes at rest
D. a 300 amp/60% duty cycle machine is rated to deliver 500 amps maximum
for 6 minutes in a ten minute period
Correct Answer
A. a 300 amp/60% duty cycle machine is rated to deliver 300 amps for 6
minutes in a ten minute period
Question 3
Conventional transformer-rectifiers;
A. convert direct current into alternating current
B. convert alternating current into direct current
C. convert alternating current into pulsed current
D. convert direct current into pulsed current
Correct Answer
B. convert alternating current into direct current
Page 3 of 397
, Question 4
A conventional diode placed in a circuit allows the passage of current in one
direction only. A silicon controlled rectifier(SCR) operates slightly differently.
How does it work?
A. an SCR conducts current in both directions until turned on and current flow
is then prevented
B. an SCR is non-conductive until turned onland then allows current to flow in
both directions
C. an SCR is non-conductive until turned on, allowing current to flow in one
direction only until the flow of current stops
Correct Answer
C. an SCR is non-conductive until turned on, allowing current to flow in one
direction only until the flow of current stops
Question 5
What is the term for voltage measured across the output terminals of a welding
machine when no current is being drawn?
A. diode voltage
B. operating voltage
C. open circuit voltage
D. terminal voltage
Correct Answer
C. open circuit voltage
Question 6
A 60% duty cycle means that the power supply can deliver its rated output for:
A 60% of the rated output only
B. 60% over the rated output followed by 4 minutes at rest
C. 6 minutes at rest followed by 4 minutes at rated output
D. 6 minutes at rated output followed by 4 minutes at rest
Correct Answer
D. 6 minutes at rated output followed by 4 minutes at rest
Page 4 of 397
