Visual Testing Level Iii_

ISS DAMMAM R.RAMAKRISHNAN ,

VT

SET A VT GENERAL QUESTION PAPER

VISUAL TESTING LEVEL III R.RAMAKRISHNAN ASNT NDT LEVEL III SL. # 1. 2. 3

QUESTIONS The SI unit for luminous flux The monochromator Stroboscopic vision

4 5. 6. 7 8

Compare IRIS to camera Color blinded man can not distinguish Color vision examination is done with Visible spectrum wavelength range Blue hazard function (page 26 of ASNT hand book on VT vol 8 What is a gray body ( page 32)

9 10 11 12 13 14 15 16 17 18 19 20 21

The difference between Photo voltalic cell, photo conductor cell, and photoelectric tubes One problem in inverse square law The use of spectrophotometers The contrast ratio The test object darker background ( page 54) Viewing angle Scotopic and photophic vision The minimum light intensity for weld inspection The depth of field relation with apperature A 20/20 vision acuity man can find a crack width of dimension on a rough surface is A 20/20 vision acuity man can find a crack width of dimension The four main weld cracks are

22

Charge coupled device and charge induced device the deference Soldering

23

Brazing

ANS Lumen Prism Viewing of object with a rapid periodic motion The apperature Red and green Anomaloscope 380 to 770 nm Damages 100 times the retina The spectral emisivity is same for all wavelength

3:1 30 to 150 degree Rods and cones 500 lx Narrow apperature more depth of field 25 micron 10 micron Toe, transverse, face HAZ Below 450 degree C Capillary action It is not a metallurgical joint Above 450 degree C Capillary action It is a metallurgical joint

ISS DAMMAM R.RAMAKRISHNAN , 24.

VT

SET A VT GENERAL QUESTION PAPER Single stage negative Second stage positive Hydrochloric acid Acid to water

35

Replication single stage? Second stage? Suitable etchant for SS The correct method of mixing acid and water while preparing etchant is One problem in calculating tensile strength of a steel specimen Under water inspection simulates the near vision acuity with naked eye page 63 Corrosion deposit is found under a bolt and nut in a fixture This is an example of Cavitation /erosion/ and corrosion The difference between frettic wear and adhesive wear Life like projection of an object is called Surface roughness value Sieve size number in relation with number and size of the particle 7.0X MAGNIFIER

36

CREEP?

37

STAGES OF CREEP

38

RASTER?

39

HALITATION?

40

DISTEL END IS AVAILALE IN WHICH INSTRUMENT SPEED OF PHOTOGRAPHIC FILM WITH RELATION TO RESOLUTION& CONTRAST

THE LOSSS OF MECHANICAL PROPERTIES AT HIGHER TEMP, PRIMARY- SLOW INCREASE IN STRAIN SECONDARY – STRAIN RATE IS UNIFORM TERTIARY – SUDDEN INCREASE IN STRAIN RATE AND FAILURE OF METAL SEE PAGE 350 VT HAND BOOK SEE PAGE 141 IN VT HAND BOOK FIBROPSCOPE

25. 26. 27 28. 29 30 31 32 33 34

41 42

MAGNIFICATION OF BORESCOPE ONE PROBLEM M= m1 Xm2 Xm3

20/200 Crevice corrosion

Orthogonal

GODINGTON

SLOW SPEED HIGH CONTRAST AND RESOLUTION

ISS DAMMAM R.RAMAKRISHNAN , 43 44 45 47 48 49 50

VT

SET A VT GENERAL QUESTION PAPER

HYPERTHERMIA DUE TO WHAT Scanning and transmission electron microscope Silicone rubber and cellulose acetate replication Optical comparator Seams and stringers are longitudinal base metal discontinuities found in The size of convex fillet refers to the size

Infra red hazard to eye.

Rolled products

ISS DAMMAM R.RAMAKRISHNAN ,

NAME AND ID NUMBER ANSWER ALL QUESTIONS ENCIRCLE YOUR CHOICE TIME ALLOTED ONE HOUR STARTING TIME

VT

SET A VT GENERAL QUESTION PAPER

ENDING TIME:

1. A convex weld surface A. Curves inward B. Curves outward C. Contains a hollow D. Both a and b above are correct. 2. General VT examination on weld surface is done with A. a minimum of 500 lx B. a minimum of 200 lx C. a maximum of 500 lx D. a minimum of 1000 lx 3. The brazing process is commonly defined as a liquid solid phase joining method accomplished at a temperature above---------------degree F A. 450 B. 650 C. 840 D. 300 4. The welding process that sometimes called as “stick welding “ is A. SAW B. SMAW C. GMAW D. GTAW 5. In welding temperature indicating sticks are used to monitor: A. Preheat temperature B. Postheat temperature C. Interpass temperature D. All of the above.

6. Which one of the following is the bevel groove edge:

ISS DAMMAM R.RAMAKRISHNAN ,

A

VT

SET A VT GENERAL QUESTION PAPER

B

C

D 7. In the above figure which one of the joint is ab lap joint? A. A B. B C. C D. D 8. The difference between the overlap and the reinforcement is : A. The angle subtended by the tangent drawn to the weld bead and the plate is more than 90 degree for reinforcement and less than 90 degree for overlap B. The angle subtended by the tangent drawn to the weld bead and the plate is less than 90degree for reinforcement and more than 90 degree for overlap C. There is no difference D. If reinforcement exceeds more than the value required by the procedure. 9. The tensile strength of a weld joint is determined by: A. by performing hardness test B. by performing a tensile test C. by performing a bend test D. both B and C are correct. 10. In root bend test the convex portion of the bent specimen would be A. Face of the weld B. Root side of the weld C. Cap side of the weld D. Any side of the weld. 11. A crater crack can be found: A. At the junction between weld bead B. At the start and stop of the weld C. In the HAZ area D. Can occur anywhere 12.

ISS DAMMAM R.RAMAKRISHNAN ,

SET A VT GENERAL QUESTION PAPER

VT

A C B

The equal size of weld of 12 mm what is the theoretical throat A. 6mm B. 8.4 mm C. 12 mm D. less than 12 mm 13

The root crack found in the figure is A. At the junction of web and flange B. The crack shown at the end of B C. There is no root crack D. None of the above A

B

C

14. The overlap is found at A. A B. B C. C D. No where 15.

The undercut is found at A. A B. B C. C D. Nowhere 16. Which is the best measuring instrument to measure the under cut? A. a Vernier B. a micrometer C. a weld gauge D. a slip gauge 17. Failure to adequately penetrate the weld root of a groove weld is called: A. lack of fusion B. excessive penetration

ISS DAMMAM R.RAMAKRISHNAN ,

VT

SET A VT GENERAL QUESTION PAPER

C. incomplete penetration D. lack of side wall fusion. 18. Incomplete fusion IF can occur at the A. At the root B. At the cap C. Any where in the weld D. Can be seen only in pipe welds. 19. PWHT is done to the completed weld joint because: A. To add strength to the weld B. To remove the thermal stresses built up during welding C. To enable to do RT D. None of the above 20. When usually examining an arc strike, the inspector should inspect for A. Lack of fusion B. Craters C. Whiskers D. Cracks 21. When the weld is to be placed on the arrow side of the joint, the weld symbol in the drawing will be A. below the line B. above the line C. in the tail D. at the end of the arrow. 22. Which one of the following weld symbols represents a fillet weld? A. B. C. D. 23. As a VT inspector you are asked to inspect a rolled shaft, and during the inspection a straight line with small depression and in the direction of rolling was noticed. This is probably A. a crack B. a lack of fusion C. a seam D. a hot tear 24. Metals that become weaker due to continuing deformation under steady stress at elevated temperatures demonstrate:

ISS DAMMAM R.RAMAKRISHNAN ,

VT

SET A VT GENERAL QUESTION PAPER

A. Thermal fatigue B. Stress corrosion cracking C. Corrosion reduction D. Creep 25. Which of the following is a basic joint configuration? A. A tee joint B. A single V joint C. A single J joint D. All of the above. 26. Three stages to a fatigue failure are: A. Initiation, propagation, and failure B. Initiation, branching, and expansion C. Stress, temperature, and propagation, D. None of the above. 27. Which one of the following surface discontinuity would initiate crack on a completed weld, when the discontinuity is located on the tension member of the weld? A. A pin hole porosity B. A sharp undercut of 0.8mm in depth C. A excess reinforcement D. A spatter. 28. Visual inspection is the most extensively used inspection method on weldment because: A. It is simple and relatively inexpensive B. Discontinuities visible to naked eye or with some optical aid avoids further NDT method of inspection C. It gives important information about conformity to specifications D. All of the above 29. A discontinuity with a small star-shaped pattern where a weld starts or stops is usually an indication of: A. cluster of porosity B. undercut C. a crater crack D. an exposed slag. 30. Cracks, suckbacks, undercuts, and overlap are found in A. Casting B. Welding C. Forging D. Rolling