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MPI > 3: Equipment & Accessories > Flashcards

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?

A

Daily

25
Q

The distance from the front filter face to the inspection surface during an inspection check is how much?

A

38 cm or 15”

26
Q

What is the max amount of visible light there shall be?

A

21.5%

27
Q

How long is the standard warmup time for a mercury vapour arc lamp?

A

5-15 min usually but refer to operators manual

**LED’s are different - check manual

28
Q

What is the standard wattage of a black light lamp?

A

100 watts

29
Q

How should defects be oriented compared to the magnetic field AND current?

A

Right angle to magnetic field

In line w/ the current

30
Q

According to ASTM E709, visible light intensity should exceed what?

A

1076 lux or 100 ft. candles

**check the code you are using

31
Q

What determines the strength of leakage fields?

A

Field indicators

32
Q

What do field indicators measure?

A

EXTERNAL field NOT flux density

33
Q

What would be better to measure with if you had a circular field?

A

Hall Effect Meter

34
Q

Describe what a leech looks like:

A

Circular pads

35
Q

What are clamps similar to?

A

Battery cables

36
Q

Anytime you’re passing a current DIRECTLY through, what type of field will be produced?

A

A circular field

37
Q

What does burning the part do to the chemical make up?

A

Slightly changes metallurgical properties and hardens part

38
Q

If you have a fair amount of material but a low contact area, how should you choose amperage?

A

Start LOW - 12 (instead of 20)

39
Q

What pushes the current and gets it flowing?

A

Voltage

40
Q

Why is dry powder more sensitive to deeper line defects?

A

They’re bigger and irregularly shaped

41
Q

What is the effective surface area?

A

Amount of surface area that can be covered on the outside of the part is 4x the diameter of centre conductor

42
Q

What inspection should you use if the part is 2x as long as it is wide (2:1 ratio)?

A

Coil and cable wrap

43
Q

Reduced sensitivity will occur at part ends while using a coil, what should you do?

A

Quick break technique

Help eddy currents establish at ends and ensures strong field at ends

44
Q

Yikes have poor sensitivity to what?

A

Subsurface parts

45
Q

Equipment and performance tests should be conducted how often?

A

Every 6 months

46
Q

What is the purpose of a unit ammeter check?

A

Confirm current on stationary unit is no more than +/- 10% (+/- 5% for multidirectional equipment) of true current value

47
Q

Timer control checks should be within what range?

A

+/- 0.1 seconds

48
Q

What is the required wavelength of black light intensity?

A

330-390 nm

49
Q

What is the absolute minimum lux you can inspect with ONLY if agreed with client?

A

538 lux

50
Q

How long do particles need to settle for in a concentration check? (Water based and petroleum)

A

30 min for water based

1 hour for petroleum c

51
Q

If an agitation system is turned off for more than 4 hours, how long must it be on for prior to inspection?

A

30 min (at least)

52
Q

If agitation system is off for 30-60 min, how long should it be on for prior to inspection?

A

10 min is adequate

53
Q

When contamination exceeds what percentage of volume when bath should be discarded?

A

30%

54
Q

What is the purpose of fabricated parts?

A

Ensure particle performance and sensitivity

55
Q

What are used to check performance for wet/dry methods when using prod or yoke method?

A

Test plates with artificially induced flaws

56
Q

What is a ketos ring?

A

A test ring specimen performed on a stationary unit using a central conductor

57
Q

What measures flux density?

A

Hall Effect Meter

MPI (9 decks)

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