1. 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? ANS
>>> Heat Affect Zone (HAZ)
2. 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.
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, 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 ANS >>> C. the current flowing in each parallel path depends on the resistance
in each path
3. Welding is a joining process that by definition requires ANS >>> ANS >>>
The application of either heat or pressure
4. 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
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, 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 ANS >>> A. a 300 amp/60% duty cycle
machine is rated to deliver 300 amps for 6 minutes in a ten minute period
5. 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 ANS >>> B. convert alternating
current into direct current
6. 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?
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, A. an SCR conducts current in both directions until turned on and current flow
is then prevented
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high temperatures but does not melt. What is the name of this region? ANS
>>> Heat Affect Zone (HAZ)
2. 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.
mailto:https://www.stuvia.com/user/techgrades
, 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 ANS >>> C. the current flowing in each parallel path depends on the resistance
in each path
3. Welding is a joining process that by definition requires ANS >>> ANS >>>
The application of either heat or pressure
4. 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
mailto:https://www.stuvia.com/user/techgrades
, 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 ANS >>> A. a 300 amp/60% duty cycle
machine is rated to deliver 300 amps for 6 minutes in a ten minute period
5. 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 ANS >>> B. convert alternating
current into direct current
6. 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?
mailto:https://www.stuvia.com/user/techgrades
, A. an SCR conducts current in both directions until turned on and current flow
is then prevented
mailto:https://www.stuvia.com/user/techgrades
