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CWB Welding Inspector Lvl 2 > Chapter 2 Power Sources for Welding > Flashcards

Chapter 2 Power Sources for Welding Flashcards

1
Q
  1. Which statement supports the fact that metals are good conductors?

a. Their electrons are tightly held by the nucleus
b. They have many free neutrons
c. They have many free electrons
d. They have many free proton

A

c. They have many free electrons

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2
Q
  1. Which statement best describes ionization potential?

a. The energy required to add an electron to form a negative ion
b. The energy required to remove an electron to form a positive ion
c. The energy released when a electron is removed from an atom
d. The energy required to remove a proton from an atom

A

b. The energy required to remove an electron to form a positive ion

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3
Q
  1. A plasma can best be described as:

a. an ionized gas
b. an inert gas
c. a good insulator
d. a high temperature gas

A

a. an ionized gas

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4
Q
  1. Choose the minimum temperatures in the centre of a welding arc column in °C.

a. 500
b. 1,000
c. 5,000
d. 50,000

A

c. 5,000

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5
Q
  1. The major voltage drop(s) in a consumable electrode welding circuit is (are):

a. the welding cables
b. the work clamp
c. the arc plasma
d. the anode drop, cathode drop and the arc plasma

A

d. the anode drop, cathode drop and the arc plasma

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6
Q
  1. The static characteristics of a welding power source are indicated on a graph which plots

a. voltage verses time
b. current verses time
c. energy verses time
d. voltage verses current

A

d. voltage verses current

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7
Q
  1. The arc starting characteristics of a CC welding power source are determined by

a. the short circuit current
b. the slope
c. the input voltage
d. the open circuit voltage

A

d. the open circuit voltage

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8
Q
  1. A voltage sensing wire feed system must be used with a ___________ to produce a stable
    self-regulating welding arc.

a. CC power source
b. CV power source
c. CV inverter power source
d. CV power source with above average droop

A

a. CC power source

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9
Q
  1. The short circuit current in a CV welding power source is determined by

a. the static and dynamic characteristics
b. the voltage in the circuit
c. the shielding gas employed
d. the arc length

A

a. the static and dynamic characteristics

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10
Q
  1. Select the correct statement.

a. A CC welding power source can be used for the gtaw and paw processes
b. A CC welding power source can be used for the smaw and saw processes
c. A CV welding power source can be used for the gmaw and fcaw processes
d. All of the above

A

d. All of the above

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11
Q
  1. The advantage of portable alternator welding power sources utilizing a rotating field design
    is ________________________

a. AC auxiliary power can be produced as well
b. more reliable, as less current flows through the brushes
c. rectifiers can be used to produce DC power
d. all of the above

A

d. all of the above

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12
Q
  1. The conductor size of the secondary windings of a welding transformer power source is

a. the same as the primary winding
b. smaller than the primary winding
c. larger than the primary winding
d. none of the above

A

c. larger than the primary winding

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13
Q
  1. Mechanical reactor control is used on which type of welding power source?

a. Silicon-controlled rectifier
b. Inverter
c. Saturable reactor
d. None of the above

A

d. None of the above

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14
Q
  1. A saturable reactor power source uses ________________________ to adjust the output.

a. a third winding on the transformer
b. a transistor
c. a tapped transformer
d. a moveable secondary winding

A

a. a third winding on the transformer

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15
Q
  1. A rectifier consists of components that

a. change DC power to AC power
b. slows the dynamic response of the power source
c. decreases the frequency of the power source
d. changes AC power to DC power

A

d. changes AC power to DC power

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16
Q
  1. The main components used to rectify are

a. diodes
b. transistors
c. inductors
d. transformers

A

a. diodes

17
Q
  1. Components typically used to correct the power factor of a transformer-rectifier welding power source are

a. inductors
b. resistors
c. capacitors
d. diodes

A

c. capacitors

18
Q
  1. SCR controlled welding power sources use ___________________ to adjust the output.

a. a tapped transformer
b. a third winding in the transformer
c. a gate pulse to initiate conduction by a diode
d. transistors

A

c. a gate pulse to initiate conduction by a diode

19
Q
  1. Which was the first welding power source design to incorporate a feedback circuits using magnetic fields?

a. Inverter
b. Mechanical reactor
c. Silicon controlled rectifier
d. Saturable reactor

A

d. Saturable reactor

20
Q
  1. An inductor in a welding power source is used to ___________________________

a. filter the DC output and affect the dynamic characteristics
b. increase the output voltage
c. change AC power to DC power
d. change the static characteristic

A

a. filter the DC output and affect the dynamic characteristics

21
Q
  1. Which was the first type of welding power source to provide accurate control of the pulsed GMAW process over a wide range of pulse frequencies7

a. SCR control
b. Saturable reactors
c. Inverters
d. Transistor output

A

d. Transistor output

22
Q
  1. Inverters are used in welding power sources to ______________________

a. change AC power to DC power
b. filter the output of SCRs
c. increase the output voltage
d. change DC power to high frequency AC power

A

d. change DC power to high frequency AC power

23
Q
  1. In inverter welding power sources, the inverter is located

a. before the transformer
b. after the inductor (choke)
c. between the output rectifier and the inductor (choke)
d. directly after the input

A

a. before the transformer

24
Q
  1. One of the major advantages of inverter welding power sources is

a. low initial cost
b. small size and low weight
c. no need for feedback control
d. high input voltages

A

b. small size and low weight

25
Q
  1. High frequency arc starting circuits use _____________________ to generate the high frequency.

a. a spark gap
b. high speed switching transistors
c. inverters
d. SCRs

A

a. a spark gap

26
Q
  1. Synergic control is typically used for the _______________ process.

a. SAW
b. SMAW
c. PAW
d. GMAW

A

d. GMAW

27
Q
  1. The open-circuit voltage of GMAW and SMAW is:

a. the Same for both
b. different
c. for SMAW is higher
d. for GMAW is higher

A

c. for SMAW is higher

28
Q
  1. Microplasma or needle arc welding apply to the following process:

a. GMAW
b. PAW
c. SAW
d. FCAW

A

b. PAW

29
Q
  1. DC generator is different to alternator because:

a. DC generators have a conductor that moves quickly through a magnetic field
b. alternators have a conductor that moves quickly through a magnetic field
c, DC generators produce a current by the stationary winding
d. none of the above

A

a. DC generators have a conductor that moves quickly through a magnetic field

30
Q
  1. Which one of the devices indicated in the following list is a microprocessor control?

a. Resistors
b. Relays
c. Transistors
d. Motors

A

c. Transistors

CWB Welding Inspector Lvl 2 (13 decks)

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