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34 Cards in this Set
- Front
- Back
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In ultrasonic testing, energy is transmitted through a series of small material displacements within the material?
True or False |
A. True
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The condition of starting at center (rest) position, moving towards maximum position, returning through the center position to a maximum position in the opposite direction and finally returning to the center point is called what?
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C. Cycle
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The back and forth movements of particles within a medium are called?
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C. Vibrations
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The time required to perform one complete cycle is called?
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A. Period
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The number of cycles in a given period of time is called the?
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B. Frequency
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The movement of a particle away from its center (rest) position is called?
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D. Displacement
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Vibrations in solid materials do not represent energy in motion?
True of False |
B. False
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A vibration can be said to have what properties?
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Cycle, Frequency, Period
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Ultrasonice sound propagates through a medium as waves of particle vibrations?
True of False |
A. True
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Ultrasonic sound is usually described as?
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B. Too high to be heard by human ear
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The velocity of sound is constant for a given material but varies from one material to another?
True or False |
A. True
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Ultrasonic vibrations are generally defined as having a frequency above?
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B. 20,000 Hz
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Ultrasonic sound can be continuous or pulsed?
True or False |
A. True
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Ultrasonic sounds moves through solids as well as?
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Air, Liquids, Grease
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Wavelength is defined as?
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The distance between points of maximum particle displacement in one direction in a wave
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Wave velocity is dependent on?
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B. The density and elasticity of of the medium (material)
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Transducers used in ultrasonic testing exhibit which of the following effects?
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B.Piezoelectric
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Transducer bandwith is dependent on the __________ of its central frequency.
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D. Amplitude
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A definite relationship exists among the three factors; velocity, frequency, and wavelength. This relationship is expressed by the formula:
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A. λ=V/f
Wavelength = Velocity divided by frequency |
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If frequency is increased wavelength will?
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A. Decrease (be shorter)
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A device that converts electrical energy to mechanical energy and mechanical to electrical energy is called a?
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C. Transducer
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The best bet for ultrasonic testing is a broad, expanding bream of mechanical energy?
True or False |
B. False
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The zone in an ultrasonic beam where irregular intensities exist is called the ?
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A. Near Zone (Fresnal Zone)
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In the adjacent figure, zone A is called the?
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A. Near Zone
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In the preceding figure, zone B is called the?
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B. Far zone
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When the beam spread of an ultrasonic beam is small, the intensity across the beam is said to?
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A. Be relatively constant
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In the adjacent figure, the intensity at point B will be the same as point A?
True or False |
B. False
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As frequecy increases in UT, beam spread (divergence) for a given diameter transducer?
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A. Decreases
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The loss of energy as sound moves through a specimen is called?
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D. Attenuation
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Acoustical impedance is defined as?
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A. The product of material density and wave velocity
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The relation ship of acoustical impedance to material density and wave velocity is expressed by the equation?
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B. Z = pV
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The greater the difference in the impedence between materials making up an interface the less the sound is reflected?
True or False |
B. False
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The purpose of couplant is to?
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D. transmit ultrasonic waves from the transducer to the specimen.
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A couplant can be?
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Water, Oil, Grease
D. All of the above |
