CWB Level 2 Study Questions rev 1 with correct
answers
1. In parallel electrical circuits, the voltage C. the current flowing in
across each resistor is the same since each each parallel path de-
path is connected pends on the resistance
to the same voltage source. Select the in each path
correct state- ment.
A. in each parallel path the resistance must be
equal- ized 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
A. a 300 amp/60% duty
2. The duty cycle of a welding power supply is
based
upon delivering its rated output for a given number of cycle machine
is rated to
minutes. Which of the following statements is 3. Convention
correct. l
A. a 300 amp/60% duty cycle machine is transforme
rated to de- liver 300 amps for 6 minutes in a rectifiers;
ten minute period A. convert
direct
B. a 300 amp/30% duty cycle machine is current
rated to de- liver 300 amps in a ten minute into
period alternat
C. a 250 amp/30% duty cycle machine is rated ng
to deliv- er 250 amps for 30 minutes separated current
by 10 minutes at rest B. convert
alternat
D. a 300 amp/60% duty cycle machine is rated ng
to deliv- er 500 amps maximum for 6 minutes current
in a ten minute period into
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113
, CWB Level 2 Study Questions rev 1 with correct
answers
direct current deliver 300 amps
C. convert alternating current into pulsed for 6 minutes in a
current ten minute period
D. convert direct current into pulsed current
B. convert alternating
cur- rent into direct
current
2/
113
, CWB Level 2 Study Questions
rev 1
4. A conventional diode placed in a circuit allows the C. an SCR is non
conduc-
passage of current in one direction only. A silicon con- tive until turne
on, al-
trolled rectifier(SCR) operates slightly differently. How lowing current t
flow in
does it work? one direction only until the
flow of current stops
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
5. What is the term for voltage measured across the out- C. open circu
voltage
put terminals of a welding machine when no
current is being drawn?
A. diode voltage
B. operating voltage
C. open circuit voltage
D. terminal voltage
6. A 60% duty cycle means that the power B. 60% ove
supply can deliver its rated output for: the rated
A 60% of the rated output only output
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113
, CWB Level 2 Study Questions
rev 1
followed by 4 minutes at rest D. 6 minutes at rated
C. 6 minutes at rest followed by 4 minutes at out- put followed by 4
rated output minutes at rest
D. 6 minutes at rated output followed by 4
minutes at rest
4/
113
answers
1. In parallel electrical circuits, the voltage C. the current flowing in
across each resistor is the same since each each parallel path de-
path is connected pends on the resistance
to the same voltage source. Select the in each path
correct state- ment.
A. in each parallel path the resistance must be
equal- ized 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
A. a 300 amp/60% duty
2. The duty cycle of a welding power supply is
based
upon delivering its rated output for a given number of cycle machine
is rated to
minutes. Which of the following statements is 3. Convention
correct. l
A. a 300 amp/60% duty cycle machine is transforme
rated to de- liver 300 amps for 6 minutes in a rectifiers;
ten minute period A. convert
direct
B. a 300 amp/30% duty cycle machine is current
rated to de- liver 300 amps in a ten minute into
period alternat
C. a 250 amp/30% duty cycle machine is rated ng
to deliv- er 250 amps for 30 minutes separated current
by 10 minutes at rest B. convert
alternat
D. a 300 amp/60% duty cycle machine is rated ng
to deliv- er 500 amps maximum for 6 minutes current
in a ten minute period into
1/
113
, CWB Level 2 Study Questions rev 1 with correct
answers
direct current deliver 300 amps
C. convert alternating current into pulsed for 6 minutes in a
current ten minute period
D. convert direct current into pulsed current
B. convert alternating
cur- rent into direct
current
2/
113
, CWB Level 2 Study Questions
rev 1
4. A conventional diode placed in a circuit allows the C. an SCR is non
conduc-
passage of current in one direction only. A silicon con- tive until turne
on, al-
trolled rectifier(SCR) operates slightly differently. How lowing current t
flow in
does it work? one direction only until the
flow of current stops
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
5. What is the term for voltage measured across the out- C. open circu
voltage
put terminals of a welding machine when no
current is being drawn?
A. diode voltage
B. operating voltage
C. open circuit voltage
D. terminal voltage
6. A 60% duty cycle means that the power B. 60% ove
supply can deliver its rated output for: the rated
A 60% of the rated output only output
3/
113
, CWB Level 2 Study Questions
rev 1
followed by 4 minutes at rest D. 6 minutes at rated
C. 6 minutes at rest followed by 4 minutes at out- put followed by 4
rated output minutes at rest
D. 6 minutes at rated output followed by 4
minutes at rest
4/
113
