Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. Static marks are most often caused by:
a. Film bent when inserted in a cassette or holder
b. Foreign material or dirt imbedded in screens
c. Scratches on lead foil screens
d. Improper film handling techniques
Q. When radiographic energy is decreased:
a. The subject contrast decreases
b. The film contrast decreases
c. The subject contrast increases
d. The film contrast decreases
Q. The major cause for poor definition is:
a. A source-to-film distance which is too long
b. Screens which are too thin
c. Film graininess
d. Too small a source size
Q. In order to increase latitude so that thick and thin portions may be radiographed atreasonable viewing densities simultaneously:
a. Fluorescent screen should be employed
b. Led screens should be at least 5 mm thick
c. The cassette may be loaded with two separate films of different speeds
d. Radiograph the object at low energy
Q. A dark circle type indication appearing on a radiograph that is the result of the failureof a core support to completely melt is called:
a. A hot tear
b. A gas hole
c. An unfused chaplet
d. A spongy shrink
Q. Dark rounded indications with rather smooth edges appear on the radiograph of castingmade in sand mould. These indications would be interpreted as:
a. Slag inclusions
b. Misrun
c. Shrinkage
d. Gas holes
Q. A dark, sharply defined, straight line in the centre of the weld, and running parallel withthe length of the weld should be interpreted as:
a. Porosity
b. Incomplete penetration
c. A slag inclusion
d. Lack of fusion
Q. A dark, jagged, linear indication appears on a radiograph of a casting. The area is a transition area between a thick and a thin section. This indication should be interpreted as:
a. A hot tear
b. A gas hole
c. An unfused chaplet
d. A spongy shrink
Q. In a radiograph of a weld there is an indication appearing at the end of the weldbead. It appears as a dark rounded indication with fine small tails coming from around the rounded indication giving it some what of a star-shaped appearance. This would probably be:
a. A crater crack
b. A slag inclusion
c. Root concavity
d. A star crack
Q. The density of the radiograph through the weld area is 3.2 while the density in the basemetal is 2.9. This would probably indicate:
a. Too high a kV was used
b. Too low a kV was used
c. There is excessive weld reinforcement
d. Weld underfill
Q. When radiographing a part which contains a crack, it will appear on the radiograph as:
a. A dark continuous line
b. A light, irregular line
c. Either a dark or light line
d. A dark linear indication which could be continuous or intermittent
Q. If it were necessary to radiograph 18 cm (7 in.) thick steel product, which of thefollowing gamma ray sources would most be used?
a. Cs–137
b. Tm–170
c. Ir–192
d. Co–60
Q. Almost all gamma radiography is performed with:
a. Tm-170
b. Natural isotopes
c. Radium
d. Ir-192 or Co-60
Q. The half value layer of lead for Co-60 is approximately 13 mm (0.5 in). If the radiation level on the source side of a 38 mm (1.5 in) lead plate is 0.64 Gy/h (64 R/h):, the radiation level on the opposite side is:
a. 0.08 Gy/h (8 R/h).
b. 0.213 Gy/h (21.33 R/h).
c. 0.107 Gy/h (10.67R/h).
d. 0.32 Gy/h (32 R/h).
Q. The degree of concentration of the radioactive material in gamma ray sources is referredto as the:
a. Atomic weight of the source
b. Half-life of the source
c. Quality of the source
d. Specific activity of the source