Application Online Workshop

Application Online Workshop - Quiz UT 2

or Go to Level UT 1 UT 3
by T. Carodiskey¹⁾ , T. Nelligan²⁾, J. O. Strycek³⁾, F. Mohr⁴⁾, R. Freemantle⁵⁾, E.A. Ginzel⁶⁾ , L. Svilainis⁷⁾, W. Hillger⁸⁾, Ahmad Chahbaz⁹⁾. (See Panel of Experts)

You will need a browser that enables Java scripts.
You could save this file on your disk and execute it off-line.
If you have problems you could brows the Quiz as a simple list

Your results you can get after you finished the Quiz.

1	The term reference level refers to:
	a) the number of decibels of calibrated gain required to place the signal from a known reflector at the reference line on the screen
	b) the number of decibels of calibrated gain required to place the signal from a flaw at the reference line on the screen
	c) a percentage of full screen height to which an operator compares signals
	d) none of the above	¹⁾
2	Calculate the transit time for a straight beam contact test in a 4" thick piece of copper ?
	a) 34.4 usec
	b) 4.4 sec
	c) 44.4 usec
	d) 0.0044 sec	¹⁾
3	Calculate the near field length of a 2.25 MHz - 0.5" straight beam contact probe when testing in nickel.
	a) 0.88"
	b) 0.64"
	c) 0.64 mm
	d) 1.27"	¹⁾
4	Lamb wave inspection techniques are most commonly used for testing:
	a) thin sheets or plates
	b) surfaces of forged or cast materials
	c) metallic materials only
	d) braze joints	²⁾
5	Guided plate waves can be used for the non-destructive testing of bulk material.
	a) true
	b) false	³⁾
6	Determination of the true weld centerline ( root ) is performed utilizing primarily:
	a) A straight beam ( 0° ) probe
	b) 45° shear from both sides of the weld
	c) 60° shear from both sides of the weld
	d) correlation of CE1 and CE2	⁴⁾
7	In verifing the axial location of the crack, which signal will usually provide a more accurate result?
	a) CE1
	b) CE2
	c) 60 degree shear waves
	d) 70 degree shear waves	⁴⁾
8	Given the frequency response of the 10 MHz transducer shown in the figure, which of the following three time domain excitation pulses would give the highest transducer output with the best bandwidth performance ? It is assumed that the peak amplitudes of the signals are the same.
	a) A 700 ns gated burst at 10 MHz.
	b) A 10 ns wide pulse.
	c) A 50 ns wide pulse.	⁵⁾
9	The Figure shows two transducers immersed in a water tank in pitch catch mode. These excite oblique incidence ultrasound compression waves which are used to scan the interface between two slabs of material. Which of the following probe types would reduce the sensitivity of the system to angulation errors and/or curvature of the surface ?
	a) Apodised probe. (a)
	b) Focused probe.
	c) Planewave probe.	⁵⁾
10	The TOFD technique augments but cannot replace pulse-echo techniques determinations of nonfusion defects
	a) the lateral wave prevents inspection near the OD
	b) hi-lo conditions cause the root region to be masked in TOFD
	c) TOFD techniques cannot provide accurate vertical extent
	d) both a) and b)	⁶⁾
11	Which is not an advantage of mechanised UT on pipeline girth welds?
	a) no radiation hazards
	b) improved defect characterization compared to radiography
	c) speed of inspection allowing potential for process control
	d) ability to determine vertical position and height of defects	⁶⁾
12	What for time variant gain(TVG) is used in ultrasonic NDE?
	a) to compensate the acoustic noise
	b) to compensate the shading effect of defects in the ultrasonic beam path
	c) to match the reflected signal and acquisition channel dynamic range;d-for ultrasound signal attenuation compensation.	⁷⁾
13	Assume you have the task of testing a rolled plate with plate waves for surface defects. How many surfaces should you have to access?
	a) one surface
	b) two surfaces	⁹⁾

Rolf Diederichs 1. May 1997, info@ndt.net.de