ULTRASONIC TESTING (SPECIFIC) SET 1

1.       A device that transforms electrical pulses into mechanical and vice versa utilizes

• (a)    Snell's law 

• (b)   mode conversion principles

• (c)      piezoelectric principles

• (d)     none of the above

2.  Acoustic energy propagates in different modes. Which of the following represent a mode?

• (a)      Longitudinal wave

• (b)      Shear wave

• (c)      Surface wave

• (d)      All of the above

3. Which of the following would be considered application(s) of ultrasonic testing?

• (a)      Determination of a material’s elastic modulus

• (b)      Study of a material’s metallurgical structure

• (c)      Measurement of a material’s thickness

• (d)      All of the above

4.   Waves whose particle displacement is parallel to the direction of propagation are called:

• (a)      Longitudinal waves

• (b)      Shear waves

• (c)      Lamb waves

• (d)      Rayleigh waves

5.  Sound waves with particle displacement transverse to the direction of wave travel are known as:

• (a)      Longitudinal waves

• (b)      Shear waves

• (c)      Rayleigh waves

• (d)      Plate waves

6. The only sound waves which travel in liquids are:

• (a)      Longitudinal waves

• (b)      Shear waves

• (c)      Rayleigh waves

• (d)      Plate waves

7.   In steel, the velocity of sound is greatest in which of the following modes of vibration?

• (a)      Longitudinal

• (b)      Shear

• (c)      Surface wave

• (d)      Sound velocity is identical in all modes, in a given material

8. The scattering of the rays of an ultrasonic beam due to reflection from a highly irregular surface is called:

• (a)      Angulation

• (b)      Dispersion

• (c)      Refraction

• (d)      Diffraction

9.  Acoustic impedance is a material's:

• (a)      (Density)/(velocity)

• (b)      (Density) × (velocity)

• (c)      Refractive index

• (d)      (Density)/(refractive index)

10.     "100 000 cycles per second" can be written:

• (a)      100 Hz

• (b)      0.1 Hz

• (c)      10 KHz

• (d)      100 KHz