MPI REVISION Flashcards by Michael Atkinson

Q

Minimum white light?

A

500 Lux

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Q

Visible light?

A

400nm-700nm

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Q

Fluorescent Peak wavelength

A

575nm

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Q

UVA wavelength?

A

315-400nm

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Q

UV Peak wavelength

A

365nm

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Q

Best way to de mag something and how?

A

Reversing DC, reversing the polarity whilst reducing the magnetising force

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Q

What wavelength is considered dangerous?

A

Below 320nm

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Q

What colours are visible light?

A

Yellow/green

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Q

Radiometer measures what?

A

Black light

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Q

Intensity is measured in what?

A

uW/cm2

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Q

Max black light?

A

20 Luxury

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Q

Uv-A light to the radiometer

A

380-400mm from the bulb

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Q

Minimum black light intensity?

A

1000uW/cm2 /// 1.0mW/cm2

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Q

Minimum white contrast?

A

10uM

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Q

Power size?

A

40 microns

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Q

Ink size?

A

1.5-40 microns

Q

Advantages of kerosene inks?

A

High wettability / protection from rusting

Q

Photometer measures what?

A

White light

Q

Magnetic ink checks are accurate to what?

A

0.1ml

Q

Soft materials / low carbon is what?

A

Easy to magnetise but lose it easier too

Q

Saturation point?

A

2.16T

Q

Where is the field strength the greatest?

A

On the surface of the component

Q

How are current values calculated?

A

Using the diameter or circumference

Q

Headstocks are usually made from what and why?

A

Copper braided to increase contact area

Prods produce what?

Distorted circular field

More turns in a coil what?

The less current is needed

A coil produces which magnetism?

Longitudinal

L/D ratio?

Min 5:1 / Max 20:1

Low fill factor ?

Below 10%

High fill factor?

Minimum of a third of furring

Flexible cable coils must be how far apart?

Max 10% of the diameter apart

Solenoid heads create which kind of magnetism?

Longitudinal

Which is the best for surface defects?

AC + wet Ink

What produces the skin effect?

AC

What frequency is AC supplied at

50 hertz

Best for slightly sub- surface defects?

HWDC/HWRAC with dry powder

B/H means what?

flux density divided by the magnetising force