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CWB MOD 19 ULTRASONIC INSPECTION QUESTIONS AND ANSWERS RATED A+ 2024/2025
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CWB MOD 19 ULTRASONIC INSPECTION QUESTIONS AND ANSWERS RATED A+ 2024/2025
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CWB MOD 19 ULTRASONIC INSPECTIONExercise Questions - Section 1 & 2
1. The upper restriction of human hearing is about
a) 20 Hz
b) 20 kHz
c)20 MHz
b) 20 kHz
Exercise Questions - Section 1 & 2
2. A usual frequency used for ultrasonic trying out 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
, three. If an ultrasonic wave in a block of metal has a wavelength of 1.Three mm and travels at a
speed of five.85 x 10 electricity of three m/s. What is the frequency?
Four.5MHz
Exercise Questions - Section 1 & 2
four. Do transverse waves in a solid travel quicker or slower than longitudinal waves?
Slower
Exercise Questions - Section 1 & 2
five. True or False
The electricity carried with the aid 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 decreased to 25%, what is the corresponding drop in dB?
(Hint: you can figure it out from the information in section 2.5 but you may also use logarithm
tables or a calculator)
12dB
Exercise Questions - Section 1 & 2
7. The lower in energy of an ultrasonic wave because it travels via a cloth is called:
a) amplitude
b) amplification
c) attenuation
c) attenuation
Exercise Questions - Section 1 & 2
8. Piezoelectric crystals can:
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