Lesson 3 UT

Question 1

1. Ultrasonic systems which display results with a baseline trace that indicates range and sensitivity of the reflector is referred to as a(n):

Answer 1

A-Scan, an a-scan provides a one-dimensional display of amplitude versus time, showing the range and sensitivity of a reflector.

Question 2

Which display presents information in a form similar to an X-ray?

Answer 2

C-scan, A C-scan is a two-dimensional image similar to an x-ray, typically used to show a plan view of a cross-section.

Question 3

A__________ produces a two-dimensional view of the cross-selection plane through t6he test object.

Answer 3

B-scan, a b-scan provides a cross-sectional view of the material being inspected.

Question 4

The B-scan provides:

Answer 4

A two-dimensional view of the cross-sectional plane.

Question 5

Reflector shape and position are more easily determined by use of the _______-scan technique.

Answer 5

C-Scan, A C-Scan is used for detailed mapping of reflector shapes and positions in materials.

Question 6

Regardless of the brand, plus-eco instruments have several components in common. These include:

Answer 6

Power, timer, sweep generator, pulser, receiver, and display

Question 7

The part of the transducer that converts energy from one form into another is sometimes referred to as the :

Question 8

The part of the transducer that converts energy from one form into another is sometimes referred to as the:

Question 9

The pulser is the source of short, high-energy bursts of electrical energy applied to the:

Question 10

The instrument gain control adjust the:

Question 11

The range control effectively adjusts the _________ of signals from the test block to represent the velocity of the sound beam within the material.

Question 12

The gain control is the controller of the :

Question 13

The gain control influences the:

Question 14

The purpose of the reject control is to:

Question 15

The reject control is particularly useful in the testing of:

Question 16

The zero offset control compensates for the time between the initial pulse and the entry of sound into the test object. This is sometimes referred to as the:

Question 17

The velocity control adjusts the instrument’s settings to:

Question 18

The receiver circuit serves to amplify the inbound pulses of energy from the:

Question 19

The pulse of energy transmitted into the test object begins its journey as an electrical impulse of low, medium, or high:

Question 20

The ______ voltage pulse produces better___________.

Question 21

The damping control is designed to help technician:

Question 22

As the damping control is adjusted from 50 ohms to 400 ohms, the improves.

Question 23

The _______ allows the operator to optimize the screen presentation for the particular transducer chosen for the test.

Question 24

Distance-amplitude correction is :

Question 25

The control needed to adjust the leading edge of a gate on the display screen is the gate:

Question 26

The process of adjusting the instrument controls to ensure proper performance is known as:

Question 27

Standardizing is an alternate term that describes the ______ process of the ultrasonic instrument.

Question 28

Testing of discontinuities within the test object is accomplished by comparing their indications with the indication received from the artificial discontinuities of known________ and at a similar __________ in standard reference block of the same material.

Question 29

The set of reference blocks in which the reflector is the same size by at different depths is known as:

Question 30

Lower voltage pulse tend to be _______ yielding better resolution to signals from ______ spaced reflectors.

Question 31

A material used between the face of a search unit and the test surface to permit or imp0rove the transmission of ultrasonic vibrations is called a ?

Question 32

A technician might use a lesser _____ as a means of overcoming the difficult of getting sound through the coarse grain structure of a thick casting.

Question 33

The air-coupled noncontracting techniques come with certain operational constraints. The biggest obstacles is the:

Question 34

Air-coupled ultrasonic transducers are best suited for examining: