CWB Level 2: Chapter 2 Test
Questions Fully Solved Answers.
What is the effect of frequency modulation when transistors are used for a DC power supply -
Answer Changes in wire feed speed cause an increase in heat input ( hard to remember )
If the total length of a cable is 18 metres , which cable according to AWG ( American Wire Gauge
) would give you better conductivity - Answer 1/0
The conductor size of the secondary windings of a welding transformer welding power source
are - Answer larger than the primary winding
An advantage of using tapped transformers is . - Answer - it only uses AC current . ( hard to
remember )
The self regulating are created by a constant voltage power supply is most commonly associated
with a constant speed wire feeder . With this type of equipment - Answer when are length
increases , welding current decreases (hard to remember)
Which was the first welding power source design to incorporate a feedback circuit - Answer
Saturable reactor ( hard to remember )
A multi - process welding power source has the following features - Answer It can provide CC
and CV output , It uses a feedback circuit to control output , It can provide adjustments for slope
and inductance
Inverter welding power sources have a very short response time because - Answer the
inverter operates at high frequencies . ( hard to remember )
SCR control of a welding power source is typically used on which type of input power - Answer
three phase input
How much do the labour and overhead costs account for welding production - Answer 80 %
What two components are used for microprocessor control - Answer Transistors and
electronic amplifiers ( hard to remember )
How is the dynamic characteristic of a power source controlled - Answer By resistance and
inductance ( hard to remember )
, What is the preferred polarity for GMAW and FCAW - Answer DCEP
Ohm's law does not apply to welding ares because - Answer the current is not proportional
to the voltage across the arc
For a consumable electrode arc welding process set on DCEN polarity , the majority of the are
energy is concentrated at the - Answer Electrode
The formula for the Ohm's law is - Answer 1 = V / R ( hard to remember )
Select the incorrect statement - Answer The GTAW and PAW processes use a CV welding
power source ( hard to remember )
A plasma can best be described as - Answer an ionized gas
Impedance is . - Answer the algebraic sum of resistance , capacitance , and inductance ( hard
to remember )
An advantage of inverter based power sources is that the circuitry is more simplified than the
conventional transformer based power source - Answer False
What does IGBT stand for in welding - Answer insulated - gate bipolar transistor
Which of the following welding processes would be a better choice for welding a two - inch
material with double V preparation - Answer SAW
The capacity to store and recall detailed welding variables in a welding power source is possible
due to - Answer microprocessor controls
When a sufficient amount of energy is imparted to the atom in a gas , this energy produces -
Answer free electrons and positively charged ions
Which one of the devices listed below is a microprocessor control - Answer Transistor ( hard
to remember )
SCR welding power sources use ? to adjust the output - Answer - a gate pulse to initiate
conduction by a diode
Questions Fully Solved Answers.
What is the effect of frequency modulation when transistors are used for a DC power supply -
Answer Changes in wire feed speed cause an increase in heat input ( hard to remember )
If the total length of a cable is 18 metres , which cable according to AWG ( American Wire Gauge
) would give you better conductivity - Answer 1/0
The conductor size of the secondary windings of a welding transformer welding power source
are - Answer larger than the primary winding
An advantage of using tapped transformers is . - Answer - it only uses AC current . ( hard to
remember )
The self regulating are created by a constant voltage power supply is most commonly associated
with a constant speed wire feeder . With this type of equipment - Answer when are length
increases , welding current decreases (hard to remember)
Which was the first welding power source design to incorporate a feedback circuit - Answer
Saturable reactor ( hard to remember )
A multi - process welding power source has the following features - Answer It can provide CC
and CV output , It uses a feedback circuit to control output , It can provide adjustments for slope
and inductance
Inverter welding power sources have a very short response time because - Answer the
inverter operates at high frequencies . ( hard to remember )
SCR control of a welding power source is typically used on which type of input power - Answer
three phase input
How much do the labour and overhead costs account for welding production - Answer 80 %
What two components are used for microprocessor control - Answer Transistors and
electronic amplifiers ( hard to remember )
How is the dynamic characteristic of a power source controlled - Answer By resistance and
inductance ( hard to remember )
, What is the preferred polarity for GMAW and FCAW - Answer DCEP
Ohm's law does not apply to welding ares because - Answer the current is not proportional
to the voltage across the arc
For a consumable electrode arc welding process set on DCEN polarity , the majority of the are
energy is concentrated at the - Answer Electrode
The formula for the Ohm's law is - Answer 1 = V / R ( hard to remember )
Select the incorrect statement - Answer The GTAW and PAW processes use a CV welding
power source ( hard to remember )
A plasma can best be described as - Answer an ionized gas
Impedance is . - Answer the algebraic sum of resistance , capacitance , and inductance ( hard
to remember )
An advantage of inverter based power sources is that the circuitry is more simplified than the
conventional transformer based power source - Answer False
What does IGBT stand for in welding - Answer insulated - gate bipolar transistor
Which of the following welding processes would be a better choice for welding a two - inch
material with double V preparation - Answer SAW
The capacity to store and recall detailed welding variables in a welding power source is possible
due to - Answer microprocessor controls
When a sufficient amount of energy is imparted to the atom in a gas , this energy produces -
Answer free electrons and positively charged ions
Which one of the devices listed below is a microprocessor control - Answer Transistor ( hard
to remember )
SCR welding power sources use ? to adjust the output - Answer - a gate pulse to initiate
conduction by a diode
