UT - MC Flashcards
A material used between the face of a search unit and the test surface to permit or improve the transmission of ultrasonic vibrations from the search unit to the material being tested is called?
a.) A wetting agent
b.) A couplant.
c.) An acoustic transmitter.
d.) A lubricant.
b.) A couplant.
In contact testing, the entry surface indication is sometimes referred to as?
a.) The initial pulse.
b.) Transmitter pulse.
c.) Both a and b.
d.) None of the above.
a.) The initial pulse.
b.) Transmitter pulse.
c.) Both a and b.
A test method employing two separate search units on opposite surfaces of the material being tested is called?
a.) Contact testing.
b.) Surface wave testing.
c.) Through transmission testing
d.) Lamb wave testing.
c.) Through transmission testing
A term used in ultrasonics to express the rate at which sound waves passes through various substances?
a.) Frequency.
b.) Velocity.
c.) Wave length.
d.) Pulse length.
b.) Velocity.
The piezoelectric effect in the search unit:
a.) Converts electrical energy to mechanical energy.
b.) Converts mechanical energy to electrical energy.
c.) Both a and b.
d.) Neither a or b.
a.) Converts electrical energy to mechanical energy.
b.) Converts mechanical energy to electrical energy.
c.) Both a and b.
When the motion of the particles of a medium is parallel to the direction of propagation, the wave being transmitted is called?
a.) Longitudinal wave.
b.) Shear wave.
c.) Surface wave.
d.) Lamb wave.
a.) Longitudinal wave.
The primary purpose of reference blocks is to?
a.) Aid the operation in obtaining maximum back reflection.
b.) Obtain the greatest sensitivity from an instrument.
c.) Obtain a common reproducible signal.
d.) None of the above.
c.) Obtain a common reproducible signal.
ULTRASONIC TESTING OF MATERIAL WHERE THE SEARCH UNIT IS IN DIRECT CONTACT WITH THE MATERIAL BEING TESTED MAY BE:
a.) STRAIGHT BEAM TESTING
B.) SURFACE WAVE TESTING
c.) ANGLE BEAM TESTING
D.) ALL OF THE ABOVE
a.) STRAIGHT BEAM TESTING
25 MILLION CYCLES PER SECOND CAN ALSO BE STATED AS :
a.25 KILOHERTZ
b.2500 KILOHERTZ
c.25 MEGAHERTZ
d.25 MICROHERTZ
c.25 MEGAHERTZ
IN A BASIC ULTRASONIC TEST PATTERN (A – SCAN) FOR CONTACT TESTING, THE INITIAL PULSE:
a.IS THE HIGH INDICATION ON THE EXTREME LEFT OF THE SCREEN THAT REPRESENTS THE ENTRY
b. IS THE FIRST PULSE THAT OCCURS NEAR THE RIGHT SIDE OF THE SCREEN AND REPRESENTS THE OPPOSITE BOUNDARY OF THE INSPECTED PART
c. IS AN INDICATION THAT APPEARS AND DISAPPEARS DURING SCREENING
d.IS ALWAYS THE SECOND PULSE FROM THE LEFT ON THE VIEWING SCREEN
a.IS THE HIGH INDICATION ON THE EXTREME LEFT OF THE SCREEN THAT REPRESENTS THE ENTRY
WHICH OF THE FOLLOWING FREQUENCIES WILL PRODUCE THE SHORTEST WAVELENGTH PULSE
a.1.0 MEGAHERTZ
b.25 MEGAHERTZ
c.10 MEGAHERTZ
d.5 MEGAHERTZ
b.25 MEGAHERTZ
THE GRADUAL LOSS OF SONIC ENERGY AS THE ULTRASONIC VIBRATIONS TRAVEL THROUGH THE MATERIAL IS REFFERED TO AS:
a. REFLECTION
b. REFRACTION
c. REPRODUCIBILITY
d. ATTENUATION
d. ATTENUATION
METAL BLOCKS WHICH CONTAIN ONE OR MORE DRILLED HOLES TO SIMULATE DISCONTINUITIES ARE CALLED:
a. SCRUBBERS
b. CRYSTAL COLLIMATORS
c. SINGLE PLANE ANGULATORS
d. REFERENCE BLOCKS
d. REFERENCE BLOCKS
THE PRESENCE OF A DISCONTINUITY WILL NOT PRODUCE A SPECIFIC DISCONTINUITY INDICATION ON THE CRT SCREEN WHEN USING THE:
a. STRAIGHT BEAM TESTING METHOD
b. SURFACE WAVE TESTING METHOD
c. ANGLE BEAM TESTING METHOD
d. THROUGH TRANSMISSION METHOD
d. THROUGH TRANSMISSION METHOD
IN A MATERIAL WITH A GIVEN VELOCITY, WHEN FREQUENCY IS INCREASED THE WAVELENGTH WILL:
a. NOT EFFECTED
b. INCREASE
c. DECREASE
d. DOUBLE
c. DECREASE
