1. What wavelength would be produced when straight beam testing in mild steel wi

Question

1. What wavelength would be produced when straight beam testing in mild steel with a 5 MHZ transducer?

a. 21.7"

b. 0.46"

c. 0.046"

d. 0.21"

2. Which transducer frequency would give you the best penetration capabilities?

a. 10 MHZ

b. 5 MHZ

c. 1 MHZ

d. 2.25 MHZ

a. 0.5 MHZ

b. 10 MHZ

c. 5 MHZ

d. 1 MHZ

4. A signal occurs at 40% FSH on your display. How high will it be after adding 6 dB of gain?

a. 20%

b. 80%

c. 46%

d. 42%

5. The ______ wave is the sound wave as it approaches or strikes an interface.

a. Frequency

b. velocity

c. pulse-echo

d. incident

Explanation / Answer

Solution:

1) c

Velocity in steel = 5890 m/s

Frequency = 5MHz

Wavelength = v/f =5890 / 5 x 10^6 = 0.001178 m = 0.046 in

2) a10MHz due to the superficial structure .

3) c 5 MHz

frequency = velocity / wavelength = 0.2479 in/10^-6 s = 6297 x10^-6 m/s

given wavelengh = 0.05 in = 0.00127 m

frequency = 6297 x10^-6 / 0.00127 =5 MHz

4) b 80%

since it is doubled for 6dB gain.

5)  c Pulse echo

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