Chapter Nine Quiz

Question 1

A disadvantage of magnetic particle inspection is that it is impossible to obtain any kind of permanent record of the indication.

Answer 1

false

Question 2

How should a fluorescent dye be viewed?

Answer 2

under blacklight

Question 3

The most likely cause of false indications is poor _______ (Hint: the answer is one word).

Answer 3

cleaning

Question 4

Is there a standard for certifying operators for the eddy current method and for magnetic particle inspection?

Answer 4

yes

Question 5

The potential drop method been used for which of the following research applications?

Answer 5

Measuring the growth of fatigue cracks.

Question 6

Which of the following statements is true?

Answer 6

Eddy current is based on detecting changes in the inductive reactance of a coil due to disturbance of the eddy current by a disontinuity and can be used on non ferrous metals.

Question 7

When using post-emulsifiable penetrants, the emulsifier must remain in contact with the surface long enough to mix with the excess penetrant but not long enough to reach penetrant in the discontinuities.

Answer 7

True

Question 8

What is a potential effect of spraying on too much developer?

Answer 8

mask indications

Question 9

The strength of the induced flux, and μ, is known as the

Answer 9

permeability

Question 10

False indications are not associated with discontinuities, but non-relevant indications are.

Answer 10

True

Question 11

What is the range of the applied field (relative to saturation) normally used in magnetic particle inspection?

Answer 11

30 to 70%

Question 12

Which of the following best describes the basis of the magnetic particle inspection method?

Answer 12

Attraction of magnetic particles to a flux leakage field formed when a discontinuity lies perpendicular angle to the induce magnetic field.

Question 13

To remove excess penetrant when using the solvent-removable process in a portable kit for spot checking:

Answer 13

Wipe away excess penetrant with clean cloth then wipe surface clean with cloth lightly wet with solvent cleaner.

Question 14

To verify that any changes in procedure have not adversely affected the technique, a test is performed on a surface with known discontinuities. This surface is called a _________ (Hint: the answer is 2 words).

Answer 14

Comparator block

Question 15

What type of developer is normally used with the solvent-removal process to spot check welds?

Answer 15

non aqueous

Question 16

Does the liquid penetrant process work on stainless steel and aluminum?

Answer 16

yes

Question 17

When using liquid penetrant inspection, the surface must be ground smooth to remove all irregularities before applying the penetrant.

Answer 17

false

Question 18

The level of residual magnetic flux remaining in a ferromagnetic material when an applied field is removed is known as….

Answer 18

retentivity

Question 19

Which of the following is a source of non-relevant indications that is NOT a result of material changes?

Answer 19

A and B - Excessive magnetizing field and residual magnetism.

Question 20

A strike is avoided when using prods by turning the power on after the prods are in place, and turning the power off before removing the prods.

Answer 20

true

Question 21

A welder is required to weld a plate that was previously magnetized for the detection of imperfections. What kind of problems can the welder expect to face when attempting to weld this plate?

Answer 21

arc blow

Question 22

A typical current for prods spaced 150 mm (6 in) apart is ________amps.

Answer 22

600

Question 23

These are the changes in a material that could cause a magnetic particle indication in the absence of a discontinuity.

Answer 23

Composition, microstructure, work hardening, and heat treatment.

Question 24

Is there a standard for certifying operators using the liquid penetrant inspection method?

Answer 24

Yes CAN CGSB 48.9712

Question 25

_________ detectors measure the small electrical potential created at right angles to an electric current when placed in a magnetic field.

Answer 25

Hall

Question 26

The most favourable direction for detecting a crack when using prods is when the crack lies across the weld metal.

Answer 26

True

Question 27

If a small crack is found by LPI in an aluminum weld, it may be repaired by simply welding over it to melt out the crack.

Answer 27

false

Question 28

The fluorescent post-emulsified penetrant process is often recommended for high-sensitivity applications such as detection of fatigue cracks.

Answer 28

true