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Shielded Metal Arc Welding (SMAW) > Line D Practice Questions (4-5) > Flashcards

Line D Practice Questions (4-5) Flashcards

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Welding Inspection Basics flashcards
1
Q

The earliest welding power sources ran off____

a. Single phase electricity.
b. Batteries.
c.Three phase electricity.
d. Engine drives.

A

b. Batteries

Specifically lead-acid storage batteries

pg. 32

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2
Q

What is electromotive force (EMF) measured in?

a. Amperes.
b. Ohms.
c. Volts.
d. Watts.

A

c. Volts

pg. 33

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3
Q

What factor can cause an increase in the amount of electromotive force (EMF) produced?

a. Increase in number of coil wraps.
b. Increase in speed of magnetic lines being broken.
c. Increase in strength of the magnet.
d. All of the above.

A

d. All of the above

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4
Q

A stronger magnet increases induced voltage by______

a. Having fewer lines of force to break.
b. Having more lines of force to break.
c. Increasing polarity.
d. Decreasing polarity.

A

b. Having more lines of force to break.

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5
Q

Three phase generators have three sets of windings spaced around the armature at ______ from each other.

a. 90°
b. 120°
c. 140°
d. 180°

A

b. 120°

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6
Q

True or false. A transformer power source has a primary and secondary coil.

a. True
b. False

A

a. True

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7
Q

What does increasing alternating current (AC) frequency do for a machines efficiency?

a. Decrease
b. Increase
c. Remains the same

A

b. Increase

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8
Q

If a secondary coil has fewer windings than a primary coil then it is called a _______________

a. Decreasing transformer
b. Increasing transformer
c. Step-down transformer
d. Step-up transformer

A

c. Step-down transformer

pg. 35

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9
Q

What are primary traps used for?

a. To adapt the transformer for different input voltages
b. To adapt the transformer for different output voltages
c. To adapt the transformer for different welding conditions
d. To adapt the transformer for different volt-ampere curves

A

a. To adapt the transformer for different input voltages

pg. 36

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10
Q

What is a rectification of an alternating current (AC)?

a. Conversion of AC to DC
b. The conversion of DC to AC
c. A polarity switch
d. A method of changing the frequency of AC

A

a. Conversion of [alternating current] to [direct current]

pg. 37

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11
Q

What does solid state diode do?

a. Only allows current flow in one direction
b. Allows the selection of the current flow direction
c. Allows the change of AC frequency
d. Allows the current to flow in all directions

A

a. Only allows current flow in one direction

pg. 37

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12
Q

True or false. Both single phase and three phase power can be rectified.

a. True
b. False

A

a. True

pg. 38

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13
Q

What is the biggest difference between an AC generator and an AC alternator?

a. In a generator the coils spin in the magnet and in an alternator, the magnet spins inside the coils
b. In a generator the magnet spins inside the coils and in an alternator the coils spin inside the magnet

A

a. In a generator the coils spin in the magnet and in an alternator, the magnet spins inside the coils

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14
Q

True or false. An AC generator is more reliable than an AC alternator.

a. True
b. False

A

a. True

An AC generator needs less maintenance. pg. 40

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15
Q

What is the biggest drawback of the DC generator?

a. Cost
b. Parts wear out frequently
c. Lack or portability
d. Doesn’t produce a smooth welding current

A

b. Parts wear out frequently

Rings and brushes require frequent replacement. pg. 41

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15
Q
A
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16
Q
A
17
Q

True or false. Single phase power produces the smoothest welding current.

a. True
b. False

A

b. False

18
Q

True or false. Engine driven power sources can be either alternator or generator type.

a. True
b. False

A

a. True

pg. 44

19
Q

What is a benefit of an engine driven power source?

a. Light weight
b. Portable
c. Inexpensive
d. Relatively maintenance free.

A

b. Portable

pg. 44

20
Q

How in a magnetic field created in a transformer power source?

a. Electrical current flows through the primary coil.
b. Electrical current flows through the secondary coil.
c. Through the use of rare earth magnets.
d. Through electromagnetic waves.

A

a. Electrical current flows through the primary coil.

21
Q

In a transformer power source where are welding leads connected.

a. The primary coil
b. The secondary coil
c. The generator terminals
d. The alternator terminals

A

b. The secondary coils

22
Q

A transformer changed AC utility power from___________.

a. Low voltage high current, to low current high voltage
b. High voltage low current, to low voltage high current
c. High voltage low current, to low voltage low current
d. low voltage low current, to low current high voltage

A

b. High voltage low current, to low voltage high current

23
Q

A transformer rectifier produces what kind of welding power?

a. AC
b. DCEP
c. Both AC and DC
d. DCEN

A

a. [alternating current] AC

pg. 46

24
Q

True or false. You can safely change the polarity switch while welding with a transformer rectifier welding machine.

a. True
b. False

A

b. False

25
Q

What is a disadvantage of a transformer/rectifier welding machine?

a. Runs on utility power
b. They can run on 1 and 3 phase power
c. They are heavy
d. They are relatively quiet

A

c. They are heavy

pg. 47

26
Q

True or false. An inverter power source is controlled electronically by computer chips.

a. True
b. False

A

a. True

pg. 47

27
Q

What type of power source is the most versatile?

a. Transformer
b. Engine driven
c. Inverter
d. Transformer/rectifier

A

c. Inverter

28
Q

Which power source is lightest and smallest?

a. Transformer
b. Engine driven
c. Inverter
d. Transformer/rectifier

A

c. Inverter

29
Q

True or false. Welding remotes can be wired or wireless?

a. True
b. False

A

a. True

30
Q

How many minutes is a duty cycle based on?

a. 1
b. 6
c. 10
d. 60

A

c. 10

Based on 10 minutes. 6 minutes to weld, 4 to rest.

31
Q

What NEMA class rating is for heavy industrial.

a. Class 1
b. Class 2
c. Class 3
d. Class 4

A

c. Class 3

32
Q

At what voltage is industrial 3 phase power usually supplied in Canada?

a. 120 V
b. 240 V
c. 480 V
d. 600 V

A

b. 240 V

pg. 49

33
Q

How often should a welding power source be locked out and cleaned?

a. Once a year
b. Twice a year
c. Three times a year
d. Four times a year

A

b. [At least] twice a year

pg. 52

34
Q

The two types of electrode holders are alligator jaw type and _________.

a. Clamp type
b. Bolt type
c. Magnetic type
d. Twist head type

A

d. Twist head type

pg 53

35
Q

Welding cable size is determined by ________.

a. Distance from machine and current settings.
b. Machine settings.
c. Distance from machine
d. Type of welding being done.

A

a. Distance from machine and current settings.

36
Q

Generally welding cable sizes range from #8 to ______.

a. #1
b. #1/0
c. #3/0
d. #4/0

A

d. #4/0

pg. 55

37
Q

Is it safe to repair surface cracks with in welding cables with electrical tape?

A

Yes.

pg. 56

38
Q

Should ground clamps be clean and tight?

A

Yes.

pg. 56

39
Q

What type of ground clamp would you want if you had material in a weld positioner.

a. As far away as possible
b. As close to the welding area as possible
c. Anywhere that is connected to the weld area.
d. On the lift point of an object.

A

b. As close to the welding area as possible

pg. 57

40
Q

Can proper grounding prevent electrical shock?

A

Yes.

pg. 57.

Shielded Metal Arc Welding (SMAW) (4 decks)

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