Question 1QuestionGenerally, the best ultrasonic testing method for detecting discontinuities oriented along the fusion zone in a welded plate is:Answer
An angle-beam contact method using surface waves.
A contact test using a straight longitudinal wave.
An immersion test using surface waves.
An angle-beam method using shear waves.
Question 2
Question
An ultrasonic testing instrument that displays pulses representing the magnitude of reflected ultrasound as a function of time or depth of metal is said to contain:
Answer
A continuous wave display.
An A-scan presentation.
A B-scan presentation.
A C-scan presentation.
Question 3
Question
At a water-to-steel interface the angle of incidence in water is 7 degrees. The principal mode of vibration that exists in the steel is:
Answer
Longitudinal
Shear
Both A and B
Surface
Question 4
Question
In a liquid medium, the only mode of vibration that exists is:In a liquid medium, the only mode of vibration that exists is:
Answer
Longitudinal
Shear
Both A and B
Surface
Question 5
Question
In an ultrasonic instrument, the number of pulses produced by an instrument in a given period of time is known as the:
Answer
Pulse length of the instrument.
Pulse recovery time.
Frequency.
Pulse repetition rate.
Question 6
Question
In a basic pulse-echo ultrasonic instrument, the component that coordinates the action and timing of other components is called a:
Answer
Display unit or CRT.
Receiver.
Marker circuit or range marker circuit.
Synchronizer, clock, or timer.
Question 7
Question
In a basic pulse-echo ultrasonic instrument, the component that produces the voltage that activates the search unit is called:
Answer
An amplifier
A receiver
Pulser
A synchronizer
Question 8
Question
In a basic-pulse-echo ultrasonic instrument, the component that produces the time base line is called a:
Answer
Sweep circuit
Receiver
Pulser
Synchronizer
Question 9
Question
In a basic pulse-echo ultrasonic instrument, the component that produces visible signals on the CRT which are used to measure distance is called a:
Answer
Sweep circuit
Marker circuit
Receiver circuit
Synchronizer
Question 10
Question
Most basic pulse-echo ultrasonic instruments use:
Answer
Automatic read-out equipment.
An A-scan presentation.
A B-scan presentation.
A C-scan presentation.
Question 11
Question
The cathode ray tube screen will display a plan view of the part outline and defects when using:
Answer
Automatic read-out equipment.
An A-scan presentation.
A B-scan presentation.
A C-scan presentation.
Question 12
Question
The incident angles at which 90 degrees refraction of longitudinal and shear waves occurs are called:
Answer
The normal angles of incidence.
The critical angles.
The angles of maximum reflection.
None of the above.
Question 13
Question
Compression waves whose particle displacement is parallel to the direction of propagation are called:
Answer
Longitudinal waves
Shear waves
Lamb waves
Rayleigh waves
Question 14
Question
Which of the following modes of vibration are quickly damped out when testing by the immersion method?
Answer
Longitudinal waves
Shear waves
Transverse waves
Surface waves
Question 15
Question
The motion of particles in a shear wave is:
Answer
Parallel to the direction of propagation of the ultrasonic beam.
Transverse to the direction of beam propagation.
Limited to the material surface and elliptical in motion.
Polarized in a plane at 45 degrees to the direction of beam propagation.
Question 16
Question
In contact testing, shear waves can be induced in the test material by:
Answer
Placing a X-cut crystal directly on the surface of the materials and coupling through a film of oil.
Using two transducers on opposite sides of the test specimen.
Placing a spherical acoustic lens on the face of the transducer
Using a transducer mounted on a plastic wedge so that sound enters the part at an angle.
Question 17
Question
As frequency increases in ultrasonic testing, the angle of beam divergence of a given diameter crystal:
Answer
Decreases.
Remains unchanged.
Increases.
Varies uniformly through each wavelength.
Question 18
Question
Which of the following is not an advantage of contact ultrasonic search units(probes) adapted with lucite shoes?
Answer
Eliminates most of the crystal wear.
Permits adaptation to curved surfaces.
Decreases sensitivity.
Allows ultrasound to enter a part's surface at oblique angles.
Question 19
Question
In which medium listed below would the velocity of sound be lowest?
Answer
Air
Water
Aluminum
Stainless Steel
Question 20
Question
A longitudinal ultrasonic wave is transmitted from water into steel at an angle of 5 degrees from the normal. In such a case the refracted angle of the transverse wave is:
Answer
Less than the refracted angle of the longitudinal wave.
Equal to the refracted angle of the longitudinal wave.
Greater than the refracted angle of the longitudinal wave.
Not present at all.