CWB Level 2 Study Questions rev 1 EXAM 2023 with all the correct answers(Actual test 100% verified)
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CWB Level 2 Study
CWB Level 2 Study Questions rev 1 EXAM 2023 with
all the correct answers(Actual test 100% verified)
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...
CWB Level 2 Study Questions rev 1 EXAM 2023 with
all the correct answers(Actual test 100% verified)
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
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
A. a 300 amp/60% duty cycle machine is rated to deliver 300 amps for 6 minutes
in a ten minute period
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
B. convert alternating current into direct current
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
C. an SCR is non-conductive until turned on, allowing current to flow in one
direction only until the flow of current stops
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
C. open circuit voltage
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
D. 6 minutes at rated output followed by 4 minutes at rest
One of the simplest ways of controlling the output of a welding transformer is to
change the efficiency of coupling between the primary and secondary coils. How
, can this be done?
A) slide a piece of wood between the primary and the secondary coils
B) design the transformer with either a moving core or moving primary coils
C) design the transformer with a number of taps to select different output
curves
D) use the timed firing of SCR's to control total conduction time
B. design the transformer with either a moving core or moving primary coils
When choosing between AC and DC output;
A. the process generally determines the type of current
B. high current output machines are always both AC/DC
C. DC is generally used for very high output applications
D. most supplies are equipped with constant voltage/constant current options
A. the process generally determines the type of current
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
C. to convert AC current to DC current
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
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