CWB MOD 19 ULTRASONIC INSPECTION QUESTIONS AND ANSWERS RATED A+ 2024/2025

CWB MOD 19 ULTRASONIC INSPECTION


Exercise Questions - Section 1 & 2

1. The higher restriction of human hearing is approximately

a) 20 Hz

b) 20 kHz

c)20 MHz
b) 20 kHz


Exercise Questions - Section 1 & 2

2. A typical frequency used for ultrasonic testing of welds is:

a) 2.25MHz

b) 2.25kHz

c) 2.25 Hz
a) 2.25MHz




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Exercise Questions - Section 1 & 2

, 3. If an ultrasonic wave in a block of metallic has a wavelength of 1.Three mm and travels at a
velocity of 5.85 x 10 energy of 3 m/s. What is the frequency?
Four.5MHz


Exercise Questions - Section 1 & 2

4. Do transverse waves in a stable tour faster or slower than longitudinal waves?
Slower


Exercise Questions - Section 1 & 2

five. True or False

The energy carried by means of a wave is proportional to the rectangular of the amplitude
True


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Exercise Questions - Section 1 & 2

6. If the amplitude of a wave is reduced to 25%, what is the corresponding drop in dB?
(Hint: you can parent it out from the data in section 2.Five however you may also use logarithm
tables or a calculator)
12dB


Exercise Questions - Section 1 & 2

7. The decrease in energy of an ultrasonic wave because it travels through a fabric is called:

a) amplitude

b) amplification

c) attenuation
c) attenuation


Exercise Questions - Section 1 & 2

8. Piezoelectric crystals can: