Top 150+ Solved Radiographic Testing Level 2 MCQ Questions Answer
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
Q. If 37 GBq (1 Ci), of Ir-92 produces dose rate of 0.59 Gy/h (59000 mR/h) at 30.5 cm (1foot), how much dose in Gy/h (R/h) will 370 GBq (10 Ci) produce at the same distance?
a. 0.59 Gy/h (59000R/h)
b. 0.0059 Gy/h (590 R/h)
c. 5.9 Gy/h (590,000 R/h)
d. 0.00059 Gy/h (59 R/h)
Q. Co-59 becomes Co-60 when it is placed in a nuclear reactor where it captures:
a. A proton
b. Contamination
c. Neutron
d. An electron
Q. Approximately how long would it take for a 370 GBq (10 Ci) Co-60 source to decay to92.5 GBq (2.5 Ci)?
a. 5.3 days
b. 5.3 years
c. 10.6 days
d. 10.6 years
Q. The specific activity of radioactive isotope is expressed in:
a. MeV (million electron-volts)
b. Ci/g (Curies per gram) or Becquerel per kg
c. R/h (Roentgens per hour or gray per hour
d. Counts per minute
Q. The general method of producing X rays involves the sudden deceleration of highvelocity electrons in a solid body called a:
a. Focus cup
b. Filament
c. Target
d. Cathode
Q. The velocity of electrons striking the target in an X ray tube is a function of:
a. The atomic number of the cathode material
b. The atomic number of the filament material
c. The voltage applied
d. The current flow in the tube
Q. The primary form of energy conversion when an X ray tube is energized results in theproduction of:
a. Primary X rays
b. Secondary X ray
c. Short wavelength X ray
d. Heat
Q. The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 cm or 1 foot)is attenuated in air to approximately 5mR/h at a distance of approximately:
a. 914.5 cm (30 feet)
b. 1524 cm (50 feet)
c. 3048 cm (100feet)
d. 6096 cm (200 feet)