17 noise is called page12 a amplitude modulation b

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17 noise is called page12 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 ] page14 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 ] page16 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 ] page20 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 ] page20 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 ] page3 a) an indication b) a defect
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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 ] page6 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 ] page9 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 ] page9 a) dominant frequency b) resonance frequency
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