Top 150+ Solved Ultrasonic Testing Level 2 MCQ Questions Answer
Q. Strong signals which travel across the horizontal time base of an A scan presentationwhile the transducer is motionless on the test piece are probably:
a. Randomly oriented flaws
b. Electrical interference
c. Grain noise
d. Loose wedge on transducer
Q. Excessive ringing of the transducer could be caused by:
a. Electrical interference
b. Loose crystal
c. Test piece with large grain size
d. Test piece with small grain size
Q. When inspecting a long bar with a longitudinal wave from one end, a series of additional echoes are seen immediately after the bottom surface reflection. these are most likely:
a. Refracted shear and longitudinal waves caused by beam spread
b. Flaw indications
c. Multiples of the back surface reflection
d. None of the above
Q. One of the most apparent characteristics of a discontinuity echo, as opposed to a nonrelevant indication is:
a. Lack of repeatability
b. Sharp, distinct signal
c. Stable position with fixed transducer position
d. High noise level
Q. Typical immersion test frequencies for wrought aluminium are:
a. 10 MHz and up
b. 5 MHz and below
c. 500 MHz to 1 MHz
d. Above 25 MHz
Q. Choice of ultrasonic test frequency depends upon which of the following?
a. Surface condition
b. Minimum size discontinuity to be detected
c. Level of grain noise
d. All of the above
Q. Polished, flat surfaces are undesirable for ultrasonic testing consideration because:
a. Coupling losses are greater
b. Scan speeds tend to be too rapid
c. Spurious lamb waves are prevalent
d. The probe sticks to the surface because of suction
Q. The most effective liquid ultrasonic couplant (highest acoustic impedance) is:
a. SAE 30 motor oil
b. Glycerine
c. Water
d. Grease
Q. When using a straight beam technique to examine a thick test piece what change(s) would you expect to see in back wall echo size as you approach the side of the test piece? (Transducer remains completely on test piece)
a. No change
b. Increase
c. Decrease
d. Depends on material acoustic velocity
Q. What useful purpose may be served by maintaining grass on the baseline?
a. To estimate casting grain size
b. To provide a reference for estimating signal to noise ratio
c. To verify adequate coupling to the test piece
d. All of the above
Q. Which of the following describes the sound field propagating in a piece of steel bar stock which is being tested from one end with longitudinal waves?
a. Non uniform, containing maxima and minima because of the focusing effect of laterally reflected waves
b. Increasing to a peak, then decreasing throughout the far field
c. Uniformly decreasing along the length of the bar
d. Decreasing according to the inverse square law
Q. When a probe is coupled to a solid, strong surface waves may be produced:
a. If a high frequency probe is used
b. If the probe has only incomplete contact with the surface
c. If the probe is large in diameter
d. None of the above
Q. To avoid interfering surface waves, low frequencies should only be used on:
a. Polished surfaces
b. Castings
c. Flat surfaces
d. Non-polished surfaces
Q. Which of the following conditions would be most likely to cause strong, interferingsurface waves?
a. High frequency transducers
b. Testing on a small diameter surface
c. Testing on a flat surface
d. Testing on a curved surface with a contoured wedge and transducer
Q. Flaw sizing by the 6 dB drop technique is applicable to:
a. Large flaws relative to the sound beam
b. Small flaws relative to the sound beam
c. Any flaws
d. None of the above