Ultrasound Quiz 1

~ First name ~ ~ Last name ~

1

The active element of most acoustic transducers used today is:

Lithium Piezoelectric ceramic Sulfide Quartz

2

The measure of how a signal from a defect compared to otherbackground reflections is called:

Acoustic impedance Signal to noise ratio Refraction Reflection

3

Which type of calibration block closely resembles the miniature angle-beam block and is used in a similar way?

An IIW block A DSC block A rompus block A shear wave calibration block

4

In the transverse or shear wave, the particles:

Move in an elliptical pattern Oscillate at a right angle to the direction of wave propagation Oscillate parallel to the direction of wave propagation Do not actually move

5

Within a given material, the speed of sound:

Is constant Decreases with distance from the transducer Increases with distance from the transducer

None of the above

6

The sound that emanates from a piezoelectric transducer originates:

From a point on the active surface From most of the active surface From a small area in the center of the active surface From the edges of the active surface

7

The ability to locate discontinuities that are close together within thematerial is called:

Resolution Sensitivity Effectiveness Phase delay

8

Which of the following would make a good couplant?

Water Oil Glycerin All of the above

9

The number of cylces per second is the definition of:

Wave speed Frequency Hertz None of the above

10

Acoustic impedance is identified by the letter:

Z I V P

11

When a longitudinal wave encounters an interface between twomaterial with different accoustic impedances, what occurs when theangle of incidence is 90 degrees?

Reflection

Refraction Mode conversion Reflection and refraction

12

Contact transducers often incorporate a:

Composite frequency adjustment Vibration suppressor Wear plate Phase adjustment sensor

13

Which type of screen presentation displays the amount of receivedultrasonic energy as a function of time?

A-scan B-scan C-scan All of the above

14

What part of the ultrasonic machine generates short, large-amplitudepulses of controlled energy?

Pulser Amplifier Transducer Scanner

15

When a wave encounters an interface at an oblique angle, what takesplace at the interface due to the different sound velocities of the twomaterials?

Attenuation Refraction Beam spread Beam impedance

16

The a large acoustic impedance mismatch at an interface will result in:

A high amount of transmitted sound energy A small degree of refraction A large critical angle A high amount of reflected sound energy

17

Which type of transducer can be used to scan wide areas when highsensitivity is not required?

Mosaic transducer Single crystal transducer of small diameter Composite transducer Paint brush transducer

18

What is the material called that is used to improve the transmission ofultrasonic sound energy from the transducer into the part?

Gel Goo Couplant Contact paste

19

The act of evaluating and adjusting the precision and accuracy of themeasurement equipment is called:

Standardization Calibration Accuracy Tuning

20

When a single element transducer is operating in the pulse echo mode,the element:

Can not start receiving reflected signals until the element has stoppedringing from its transmit function

Needs to have a high pulse rate Should be used in the dual mode Can only be made with lithium sulfate

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