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2. Infrared thermography active testing applies:
a. primarily to metals.
b. primarily to nonmetals.
c. to almost all types of materials.
d. primarily to bonded structures.
3. Transient temperature differences over discontinuities in materials having higher thermal
diffusivities are ______ in duration and _______ in magnitude than in materials with lower thermal
diffusivities.
a. shorter, lower
b. longer, lower
c. longer, greater
d. shorter, greater
Ultrasonic Testing
Level I
1. The amount of beam divergence from a transducer element is primarily dependent on the:
a. type of test.
b. tightness of the transducer element backing in the search unit.
c. frequency and transducer element size.
d. refraction.
2. On the area-amplitude ultrasonic-standard test blocks, the flat-bottomed holes in the blocks are:
a. all of the same diameter.
b. different in diameter, increasing by 1/64 in. increments from the No. 1 block to the No. 8
block.
c. largest in the No. 1 block and smallest in the No. 8 block.
d. drilled to different depths from the front surface of the test block.
3. On many ultrasonic testing instruments, an operator conducting an immersion test can remove
that portion of the screen presentation that represents water distance by adjusting a:
a. pulse-length control.
b. reject control.
c. sweep-delay control.
d. sweep-length control.
Level II
1. If a contact angle beam transducer produces a 45 degree shear wave in steel (V
S
= 0.323 cm/s), the
angle produced by the same transducer in an aluminum specimen (V
S
= 0.310 cm/s) would be:
a. less than 45 degrees.
b. greater than 45 degrees.
c. 45 degrees.
d. more information is required.
2. A discontinuity is located having an orientation such that its long axis is parallel to the sound
beam. The indication from such a discontinuity will be:
a. large in proportion to the length of the discontinuity.
b. small in proportion to the length of the discontinuity.
c. representative of the length of the discontinuity.
d. such that complete loss of back-reflection will result.
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