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3: Equipment & Accessories Flashcards

1
Q

What are the 3 most important factors in when it comes to sensitivity level?

A
  1. Field strength & direction
  2. Current level & type
  3. Control of particles
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2
Q

Too low of current produce what?

A

Leakage fields that are too weak to properly form indications

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3
Q

AC is best for what?

A

Keeping particles moving

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4
Q

What type of powder and current is better for subsurface discontinuities?

A

Dry powders w/ half wave rectified AC or half wave DC

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5
Q

Our eyes are most sensitive to what application?

A

Wet continuous fluorescent

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6
Q

Describe the voltages and amps in a Step Up transformer:

A

Volts up, amps down

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7
Q

Describe volts and amps in a Step Down transformer:

A

Volts down and amps up

best for MPI

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8
Q

What do amps measure?

A

Current

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9
Q

What do volts measure?

A

Pressure

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10
Q

What does the “tap” setting change?

A

Amperage

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11
Q

What concentration of particles is allowed for visible magnetic particles?

A

1.2-2.4 mL per 100 mL vehicle

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12
Q

What concentration of particles is allowed for fluorescent particles?

A

0.1-0.4 mL per 100 mL vehicle

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13
Q

Amperage of DC depends on what?

A

Thickness of the part

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14
Q

Amperage of indirect current depends on what?

A

L/D ratio

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15
Q

A stronger magnetizing field will be in what size of diameter (given the same amount of amperage)?

A

Smaller diameter

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16
Q

How do you figure out if you have enough amps?

A

QQI, Pie or Gauss gauge

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17
Q

For AC, how much weight is the yoke required to lift in a dead lift test?

A

10 lbs

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18
Q

For DC, how much weight is required to lift for a dead lift test?

A

30-40 lbs

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19
Q

Longitudinal fields all have to be what?

A

Indirect

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20
Q

What are 4 examples of a longitudinal magnetic field?

A
  1. Coil
  2. Coil wrap
  3. Yoke
  4. Permanent magnet
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21
Q

What is the formula for a low fill centre conductor?

A

Diameter of centre conductor + 2x and wall thickness x 20 amps

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22
Q

For DC current, and yoke legs spaced 4-6” apart, how much weight is the minimum it is required to lift?

A

50 lbs (23 kg)

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23
Q

For AC current, yoke legs spaced 2-4” apart, what is the minimum weight requirement they should be able to lift?

A

10 lbs (4.5 kg)

24
Q

How often do codes require black light intensity checks to be done?

25
The distance from the front filter face to the inspection surface during an inspection check is how much?
38 cm or 15”
26
What is the max amount of visible light there shall be?
21.5%
27
How long is the standard warmup time for a mercury vapour arc lamp?
5-15 min usually but refer to operators manual **LED’s are different - check manual
28
What is the standard wattage of a black light lamp?
100 watts
29
How should defects be oriented compared to the magnetic field AND current?
Right angle to magnetic field | In line w/ the current
30
According to ASTM E709, visible light intensity should exceed what?
1076 lux or 100 ft. candles **check the code you are using
31
What determines the strength of leakage fields?
Field indicators
32
What do field indicators measure?
EXTERNAL field NOT flux density
33
What would be better to measure with if you had a circular field?
Hall Effect Meter
34
Describe what a leech looks like:
Circular pads
35
What are clamps similar to?
Battery cables
36
Anytime you’re passing a current DIRECTLY through, what type of field will be produced?
A circular field
37
What does burning the part do to the chemical make up?
Slightly changes metallurgical properties and hardens part
38
If you have a fair amount of material but a low contact area, how should you choose amperage?
Start LOW - 12 (instead of 20)
39
What pushes the current and gets it flowing?
Voltage
40
Why is dry powder more sensitive to deeper line defects?
They’re bigger and irregularly shaped
41
What is the effective surface area?
Amount of surface area that can be covered on the outside of the part is 4x the diameter of centre conductor
42
What inspection should you use if the part is 2x as long as it is wide (2:1 ratio)?
Coil and cable wrap
43
Reduced sensitivity will occur at part ends while using a coil, what should you do?
Quick break technique | Help eddy currents establish at ends and ensures strong field at ends
44
Yikes have poor sensitivity to what?
Subsurface parts
45
Equipment and performance tests should be conducted how often?
Every 6 months
46
What is the purpose of a unit ammeter check?
Confirm current on stationary unit is no more than +/- 10% (+/- 5% for multidirectional equipment) of true current value
47
Timer control checks should be within what range?
+/- 0.1 seconds
48
What is the required wavelength of black light intensity?
330-390 nm
49
What is the absolute minimum lux you can inspect with ONLY if agreed with client?
538 lux
50
How long do particles need to settle for in a concentration check? (Water based and petroleum)
30 min for water based | 1 hour for petroleum c
51
If an agitation system is turned off for more than 4 hours, how long must it be on for prior to inspection?
30 min (at least)
52
If agitation system is off for 30-60 min, how long should it be on for prior to inspection?
10 min is adequate
53
When contamination exceeds what percentage of volume when bath should be discarded?
30%
54
What is the purpose of fabricated parts?
Ensure particle performance and sensitivity
55
What are used to check performance for wet/dry methods when using prod or yoke method?
Test plates with artificially induced flaws
56
What is a ketos ring?
A test ring specimen performed on a stationary unit using a central conductor
57
What measures flux density?
Hall Effect Meter

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