Quiz 4

Question 1

1)

An attenuator is used to measure sound energy power losses in a quantitative manner?

Question 2

2)

An A Scan system has advantages for the use of attenuation measurement?

Question 3

3)

Signal amplitudes, as shown by A scan, is not determined by the voltage applied to the transducer?

Question 4

4)

If the amplifier of an echo is reduced by 50%, the decibel value is changed by 20dB?

Question 5

5)

The decibel value on the attenuator is changed by 6 dB. This constitutes an echo amplitude change of 10 or 1 over 10?

Question 6

6)

The echo height is changed by +12dB. This is equivelant to 4 or 1/4?

Question 7

7)

The echo height is changed by 5 or 0.2. this is equivelant to +14 or -14dB?

Question 8

8)

Equation in book // unable to insert

Question 9

9)

Attenuation is loss of energy due to absorption or scattering by grain structure or inhomogeneities in the material?

Question 10

10)

Attenuation is related to hrain size, grain orientation?

Question 11

11)

When the wavelength of the ultrasonic beam is larges than the grain size, materials can be readily tested?

Question 12

12)

Austenitic cast steel is easy to ultrasonically examine?

Question 13

13)

Flake, grade 20 cast iron, can be ultrasonically examined in the thickness range greater than 100 mm?

Question 14

14)

Aluminium bronze can be examined in oil using 2.5 MHz?

Question 15

15)

A low steel alloy is heat treated at 950 degree centigrade. The resulting structure may be examined at 10 MHz?