Level 2 Question [Ref]
II-1 AVG (or DGS in English) diagrams compare flaw signal amplitudes to [Krautkramer 3rd Edition ] a) side drilled holes
b) flat bottomed holes
c) a theoretical maximum
d) DAC's
II-2 As the pulse length of the excitation voltage is shortened the transmitted pulse [Krautkramer 3rd Edition ] a) frequency spectrum broadens
b) frequency spectrum shortens
c) increases energy output
d) increases penetration ability
II-3 In general, the frequency content of an ultrasound beam has a larger proportion of high frequencies in its spectrum [Krautkramer 3rd Edition ] a) on axis
b) off axis
c) in the far zone
d) in the free zone
II-4 If a signal is dropped from 100% FSH to 32% FSH, the number of dB gain removed from the receiver is [Krautkramer 3rd Edition ] a) 14
b) 10
c) 6
d) 4
II-5 A typical voltage range for driving (exciting) piezoelectric crystals would be [Krautkramer 3rd Edition ] a) 50 to 100 mV
b) 50 to 100 V
c) 50 to 100 kV
d) 500 to 1000 V
II-6 When an ultrasonic machine is equipped with this option, the pulse energy and pulse length can be adjusted [Krautkramer 3rd Edition ] a) receiver fine grain control
b) swept gain
c) time corrected gain
d) damping
II-7 The main disavantage of a broadband receiver in a ultrasonic machine is [Krautkramer 3rd Edition ] a) non-linear response to amplification
b) amplifier noise limits possible amplification
c) RF display cannot be used
d) rectified display cannot be used
II-8 The repeated reflections of ultrasonic pulses from between surfaces or discontinuities within a body are [Australian Standard ] a) ghost echoes
b) sing-around
c) multiple echoes
d) wrap-around
II-9 Electronic gates on the trace of a UT machine can be used to [Krautkramer 3rd Edition ] a) determine the presence of flaws
b) determine the amplitude of flaws
c) both a and b
d) none of the above
II-10 When flaw echo signals are recorded so as to display a plan view of the test piece the presentation is called [Krautkramer 3rd Edition ] a) A-scan
b) B-scan
c) C-scan
d) D-scan
II-11 Increasing the pulse repetition frequency will result in [Goldman ] a) decreasing sensitivity
b) increased resolution
c) altering the probes' frequency output
d) brightening the baseline
II-12 For the purposes of ultrasonic testing, signal-to-noise ratio is a function of [Butt ] a) the probe
b) the oscilloscope
c) a combination of probe and scope
d) none of the above
II-13 When calibrating an ultrasonic instrument for range, the maximum distance of interest should not be less than [Butt ] a) 100 mm
b) 200 mm
c) one half the horizontal scale
d) two thirds the horizontal scale
II-14 In the DGS (AVG German) system of defect sizing, the diagram relates to soundpath distance to the _________ to obtain the relative distance. [Butt ] a) probe size
b) near-field length
c) stand-off distance
d) depth of defect
II-15 If you are drawing a DAC for an inspection range of 200mm and your response from the 3/8 node reference hole at 125mm has already dropped to 10% FSH you will have to use [Butt ] a) a new calibration block
b) larger reference holes
c) the DGS (AVG) system
d) a split DAC
II-16 Signal averaging, correlation, and filtering are techniques used in ultrasonic systems to [Silvus ] a) extract weak signals from incoherent noise
b) improve resolution
c) characterize defects for type
d) none of these techniques are used in ultrasonic testing
II-17 The process where by a re-current signal is extracted from incoherent noise is called [Silvus ] a) amplitude modulation
b) frequency modulation
c) signal averaging
d) filtering
II-18 Receiver noise must often be filtered out of a test system. Receiver amplifier noise increases proportionally to [Silvus ] a) the square root of the bandwidth
b) the inverse square of the bandwidth
c) attenuation
d) temperature
II-19 Which is not used as an acoustic imaging method? [Silvus ] a) deconvolution
b) sequenced array
c) liquid-surface levitation
d) holography
II-20 When determining signal-to-noise ratio the suppression control is set at [British Standard ] a) maximum
b) minimum
c) 50%
d) suppression setting is not important
II-21 When determining signal-to-noise ratio, the noise is attributable to [British Standard ] a) electrical noise from machine, cable and probe
b) metal grain structure
c) both a and b
d) inability for focus the baseline
II-22 A response or evidence of a response in non-destructive testing that requires interpretation is called [Australian Standard ] a) an indication
b) a defect
c) a flaw
d) signal-to-noise ratio
II-23 An ultrasonic display in rectangular coordinates where distance or time of flight is represented in one direction and probe displacement represented on the other and reflected pulses as bright marks on a dark background (or vise versa) is called a(n) [Australian Standard ] a) A-scan
b) B-scan
c) C-scan
d) tomograph
II-24 The time interval between the initial pulse and the initiation of the time base sweep is termed [Australian Standard ] a) range
b) time of flight
c) programmed off-set
d) delay
II-25 The frequency at which the overall response of an ultrasonic pulse-echo flaw detection system is maximum is the [Australian Standard ] a) dominant frequency
b) resonance frequency
c) nominal frequency
d) anti-resonance frequency
II-26 The repeated reflections of ultrasonic pulses from between surfaces or discontinuities within a body are [Australian Standard ] a) ghost echoes
b) sing-around
c) multiple echoes
d) wrap-around
II-27 Instrument settings which relate a reference echo of reproducible amplitude with which other instrument settings relating to a discontinuity echo are compared is the [Australian Standard ] a) scanning level
b) threshold level
c) reference sensitivity
d) overall system gain
II-28 Addition of suppression or reject to a display effectively [Australian Standard ] a) filters out unwanted noise
b) reduces dynamic range
c) increases sensitivity
d) none of the above
II-29 The relationship between amplitudes of an indication in A-scan presentation and the magnitude of the corresponding received signals is used to determine [Australian Standard ] a) vertical linearity
b) manual scanning speed
c) longitudinal/shear mode energy ratios
d) none of the above
II-30 When information is presented as a B-scan on an oscilloscope, intensity (or amplitude) of a signal is indicated by [Ensminger ] a) strobe effects for signals over a threshold amplitude
b) digital readout on the corner of the screen
c) brightness of the spot on the scope
d) none of the above