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EC L1 > Quiz Questions > Flashcards

Quiz Questions Flashcards

1
Q

What does HPF stand for?

A

High Pass Filter

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2
Q

The HPF is used to what?

A

Eliminate low frequencies which are produced by slow changes (ex. conductivity shift)

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3
Q

What is the main function of the LPF?

A

Remove high frequency interference noise

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4
Q

Probes for inspection of pipe and tubing are usually of what variety?

A

Bobbin (ID)

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5
Q

What are drilled holes commonly used to represent?

A

Pitting

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6
Q

When testing by for surface flaws, how do you want the frequency?

A

As high as possible

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7
Q

The higher the inductance of a coil at a given frequency…..

A

The more sensitive the coil will be

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8
Q

What does phase lag have to do with depth?

A

It increases with discontinuity depth

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9
Q

When is the use of a HPF not recommended?

A

When scanning manually

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10
Q

When using eddy currents to measure the thickness of a non conductive coating applied to the conductive base, the measurement is based on what?

A

An impedance due to liftoff

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11
Q

Filters are adjusted in what units?

A

Hertz

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12
Q

What does the HPF allow?

A

High frequencies to pass and filters out the low frequencies

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13
Q

What type of probe is most often used to inspect the inside diameter of a machined hole?

A

Bolt hole probe

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14
Q

Where are sliding probes used to test?

A

Around the edges of fasteners

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15
Q

What changes the angular relationship on the screen?

A

Frequency

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16
Q

What does coring a coil do to flux density?

A

Strengthens it

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17
Q

What happens to the conductivity of a material as the temp of the material increases?

A

Decreases

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18
Q

What’s another name for hybrid coil?

A

Reflection coil

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19
Q

Variations from thickness mean you’re using what?

A

Too high of a frequency

20
Q

Variations in skin effect effect mean what?

A

Frequency is too low

21
Q

Which eddy current machine will detect permeability changes?

A

ANY machine

22
Q

When the material temp goes up, what is there more of?

A

Resistance

23
Q

When material permeability increases, what happens to the eddy current signals?

A

They become erratic and distorted

24
Q

What does the ANGLE of the trace represent?

A

DEPTH

25
Q

When will you see eddy currents while using DC?

A

When the power is being turned on and off

26
Q

What does it mean if there is no coil in the circuit?

A

No lag therefor in phase

27
Q

A coil addition to the circuit means what?

A

A 90 degree phase lag

28
Q

Which factor is the lag represented by?

A

XL

29
Q

What happens in the XL and the R? (Separately)

A 
R = time/place volt happens
XL = time/degree amp happens
30
Q

The screen on the bridge is where we do what?

A

Measurements

31
Q

If the resistance increases, what do you need more of?

A

Voltage

32
Q

What do non ferromagnetic materials use as the permeability value in the formula?

A

ONE

33
Q

Lower conductivity means what for depth of penetration?

A

Increased DOP

34
Q

The impedance has to do with what features?

A

Coil features

35
Q

Why do we use coils instead of just wire?

A

Circular currents will produce a longitudinal magnetic field

36
Q

What material factor makes eddy currents difficult?

A

Permeability

37
Q

Is a DC saturation coil apart of the Wheatstone bridge? If not, what is it considered?

A

No. It’s considered a hybrid arrangement

38
Q

What gives a permanent paper record of inspection?

A

Strip chart

39
Q

A waterfall display is used with what type of probe?

A

Spinning/rotary probe

40
Q

Each line on the waterfall display represents what?

A

360 degrees

41
Q

What is the ideal signal to noise ratio?

A

3 to 1

42
Q

What are the extreme ends of the eddy current frequency range?

A

100 Hz to 10 MHz

43
Q

More permeability means more and less of what?

A

More skin effect, less depth of penetration

44
Q

What type of defect would a donut probe be looking for?

A

Radial crack from bore (crack coming out from hole)

45
Q

What is the only way to see differences on the screen?

A

With voltage and current changes

46
Q

What is the phase lag angle at one standard depth of penetration?

A

57 degrees

47
Q

What does a vector describe?

A

Direction and magnitude

Angle = direction and magnitude = length

EC L1 (3 decks)

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