where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

195 views
Career Discussions
S.Thomson
S.Thomson
09:22 Jun-04-2003
quiz qeustion queries

I need some conformation on some questions.

Q1 Standing waves are generated in ut testing for
a. B-scans
b. through testing
c. resonance thickness testing
d. flaw detection

Q2 Touching the reflection point of a normally incident transverse wave with an oily finger will
a. reduce signal by about 6dB
b. increase the signal by about 2dB
c. reduce the signal by about 2dB
d. have no effect on the signal

Q3 The result of increasing the temp from 10deg C to 30 deg C is
a. decrease the refracted angle
b. decrease the acoustic velocity
c. increase sensitivity
d. all of the above

Q4 The unit of sound (or electrical energy) gain or attenuation , dB is
a. a ratio of voltages or intencities
b. one tenth of a bell
c. both a and b

Q5 Non contact ultrasonic coupling , ie coupling across an air gap has its advantage in
a. testing at elevated temperatures is possible
b. avoiding trasducer wear on rough surfaces
c. avoiding fluid contamination of test piece
d. all of the above

Q6 An advantage of using ut surface waves over other wave modes is
a. the ease of focusing the beam
b. test piece contours are followed without loss of due to direction changes
c. good sensitivity to subsurface defects
d. none of the above

Q7 In snells law there will be no first criticle angle if the
a. acoustic impedance of the refracting medium is greater than 1
b. acoustic velocity in the refracting medium is less than in the incident medium
c. incident angle does not exceed 89 degrees
d. none of the above there will always be a first critical angle





    
 
 

Product Spotlight

CIVA 2017 UT Module

CIVA NDE Simulation Software is the world leader of NDT Simulation. The UT simulation Module incl
...
udes: - "Beam computation": Beam propagation simulation - "Inspection Simulation": Beam interaction with flaws or specimens The user can simulate a whole inspection process (pulse echo, tandem or TOFD) with a wide range of probes (conventional, Phased- arrays or EMAT), components, and flaws.
>

Exertus Dual 120

The Exertus Dual 120 Projector has the ability to accept Iridium 192 sources or Selenium 75 source
...
s. This projector incorporates design and safety features that make it flexible, compact and lightweight. The Projector is lighter than most of its competitors. It incorporates an improved source channel, based on a new helicoidal design, which makes maintenance easier. The helicoidal design also allows smoother movement of the source assembly inside the device, making it easier for the operator and improving safety. The Projector also has a unique safety feature not found in competitive products. The source assembly locking mechanism is triggered by the source holder capsule at the front of the source assembly, thereby always assuring the operator that the source has returned to the safe position. The Exertus Dual 120 is ISO3999:2004 compliant.
>

Aerospace Systems - Automated Ultrasonic Inspection

USL are specialists in the design and manufacture of turnkey ultrasonic inspection systems for aer
...
ospace applications. From monolithic composites to complex honeycomb structures. This video shows just a few examples of what is possible, find out more at: www.ultrasonic-sciences.co.uk
>

GEKKO - Portable Phased Array Testing with TFM in Real-Time

The portable phased array testing system GEKKO provides 64 parallel test channels. On creating testi
...
ng parameters the operator is assisted by the CIVA software. Due to its modular set-up the GEKKO instrument is suitable for operators of all skill levels.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window