Article - 5 (UT)

Question 1

Measuring Thickness:

measuring the thickness of materials using the contact pulse-echo method at temperatures not to exceed ___

Answer 1

93°C [200°F]

Question 2

Measuring Thickness:
One block should have a thickness value near the _________ of the range of interest and another block near the _________ thickness.

Answer 2

maximum

minimum

Question 3

Measuring Thickness:

Use at least _____standardization blocks

Answer 3

two

Question 4

High-temperature materials, up to about ______ , can be measured with specially designed instruments with high-temperature compensation, search unit assemblies, and couplants.

Answer 4

540°C [1000°F]

Question 5

A rule of thumb often used is as follows: The apparent thickness reading obtained from steel walls having elevated temperatures is high (too thick) by a factor of about ________

Answer 5

1 % per 55°C [100°F].

Question 6

SE-797 provides guide lines for the ____________method for measuring thickness.

Answer 6

contract pulse echo

Question 7

A pulse echo instrument measures the ______ of the ultrasonic pulse through the part.

Answer 7

transit time

Question 8

Reference blocks used to calibrate equipment should have an ultrasonic velocity:

Answer 8

The same as the piece to be tested

Question 9

Which is not a type of thickness measurements instrument?

Answer 9

Flaw detectors with A-scan floor scan pressure readout

Question 10

For measuring thin sections which type of search unit is generally used?

Answer 10

highly damped, high frequence

Question 11

When using a direct contact,single element search unit the display start is

Answer 11

syncronized to the initial pulse

Question 12

When performing a complete calibration of an instrument using a delay line single element search unit calibration blocks should be

Answer 12

At least two with a thickness near the maximum of the range to be measured and the other block near the minimum thickness

Question 13

When calibrating a UT instrument using Case II, what minimum number of test blocks should be used when the instrument must be completely calibrated with the delay line search unit?

Answer 13

2

Question 14

When using dual search units there is an inherent error due to the:

Answer 14

Vee path that the sound beam travels

Question 15

When measuring materials at high temperatures the reading are high by a factor of:

Answer 15

1% per 100 F