No. |
Questões | [Ref] |
| 1 |
Questão 1 [Question 1]
Materials that hold their electrons loosely are classified as:
resistors.
X conductors.
semiconductors.
insulators.
|
[SG4 ] |
| a) CORRETA [RIGHT] | ||
| b) errada [wrong] | ||
| c) errada [wrong] | ||
| d) errada [wrong] | ||
| 2 |
Questão [Question]
100% IACS is based ona specified copper bar having a resistance of:
0.01 ohms
100 ohms
X 0.017241 ohms
172.41 ohms
|
[SG4 ] |
| a) errada [wrong] | ||
| b) errada [wrong] | ||
| c) CORRETA [RIGHT] | ||
| d) Em fase com o campo primário [In phase with the primary field] | ||
| 3 |
Pergunta 3 [Question 3]
A resistivity of 13 4Q-cm is equivalent to a conductivity in percent IACS of:
11.032
0.0625
1652
X 13.26
|
[SG4 ] |
| a) errada [wrong] | ||
| b) CORRETA [RIGHT] | ||
| c) errada [wrong] | ||
| d) errada [wrong] | ||
| 4 |
Questão 4 [Questão 4]
A term used to describe the effect observed due to a change in the electromagnetic coupling between a test specimen anda probe coil when the distance of separation between them is varied is:
fill factor.
edge effect.
end effect.
X liftoff
|
[SG4 ] |
| a) CORRETA (RIGHT] | ||
| b) errada [wrong] | ||
| c) errada [wrong] | ||
| d) errada [wrong] | ||
| 5 |
Questão 5 [Question 5]
Materials that tend to concentrate magnetic flux lines are:
conductive.
X permeable.
resistive.
inductive
|
[SG4 ] |
| a) CORRETA [RIGHT] | ||
| b) errada [wrong] | ||
| c) errada [wrong] | ||
| d) errada [wrong] | ||
| 6 |
Questão 6 [Question 6]
Diamagnetic materials have:
a permeability greater than air.
X a permeability less than air.
a permeability greater than ferromagnetic materials.
no permeability.
|
[SG4 ] |
| a) errada [wrong] | ||
| b) errada [wrong] | ||
| c) errada [wrong] | ||
| d) CORRETA [RIGHT] | ||
| 7 |
Questão 7 [Question 7]
Edge effect is a term most applicable to the inspection of:
bars.
tubes.
X plates or sheets.
castings.
|
[SG4 ] |
| a) errada [wrong] | ||
| b) errada [wrong] | ||
| c) CORRETA [RIGHT] | ||
| d) errada [wrong] | ||
| 8 |
Questão 8 [Question 8]
Calculate the effect of fill factor when a conducting bar 12.7 mm (0.5 in.) in diameter with an effective permeability of 0.4 is placed into a 25.4 mm (1 in.) diameter coil with an unloaded voltage of 10 V. The loaded voltage is:
2V
4.6V
X 8.5V
32.V
|
[SG4 ] |
| a) errada [wrong] | ||
| b) CORRETA [RIGHT] | ||
| c) errada [wrong] | ||
| d) errada [wrong] | ||
| 9 |
Questão [Question]
The thickness of nonconductive coatings on a conductive base can be most simply measured by:
X observing the liftoff caused by the coating.
testing both sides of the specimen.
varying the current in the coil.
varying the test frequency over a given range during the test.
|
[SG4 ] |
| a) CORRETA (RIGHT] | ||
| b) errada [wrong] | ||
| c) errada [wrong] | ||
| d) CORRETA [RIGHT] | ||
| 10 |
Questão 10 [Question 10]
Temperature changes, vibration, and environmental effects are test coil inputs that generate:
X unwanted signals.
magnetic fields.
eddy currents.
drift.
|
[SG4 ] |
| a) errada [wrong] | ||
| b) errada [wrong] | ||
| c) errada [wrong] | ||
| d) CORRETA (RIGHT] | ||