Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. A wetting agent is used in film processing to:
a. More closely control development
b. Prevent formation of water marks during the drying stage
c. Reduce formation of air bubbles in the developer solution
d. Reduce formation of air bubbles in the fixer
Q. Film intensifying screens are normally used to:
a. Decrease exposure time
b. Increase grain size
c. Shield film from stray light
d. All of the above
Q. A radiation producing device which emits a broad spectrum of wavelengths is:
a. A gamma ray source
b. An X ray machine
c. A Geiger-Müeller tube
d. A curie tube
Q. Which of the following represent types of radiation stemming from radioactive decay :
a. Alpha, beta, gamma
b. Alpha, gamma, delta
c. X, rho, sigma
d. Sigma, gamma, beta
Q. Explain the difference between X and gamma rays:
a. They are both types of electromagnetic radiation
b. X rays are naturally occurring; gamma rays are man made
c. X rays are produced electrically; gamma rays are emitted by disintegrating atomic nuclei
d. There is no difference
Q. Most industrial X ray machines contain targets made of:
a. Beryllium
b. Magnesium
c. Lead
d. Tungsten
Q. The effects of scattered radiation may be lessened by:
a. Using a lead mask around the test piece
b. Using a lead or copper filter between the X ray tube and the test piece
c. Using lead screens
d. All of the above
Q. A reaction which occurs when a radiation beam of 500 keV is partially absorbed by atest piece would probably be:
a. The Compton effect
b. The photoelectric effect
c. Pair production
d. Any of the above
Q. The term used to describe the reaction of human cells, other than reproductive cells, toionizing radiation is:
a. Genetic effects
b. Somatic effects
c. Corpuscular effects
d. Hematological effects
Q. A low density image of the letter ‘B’ on a radiographic film would probably be causedby:
a. Under exposure
b. Excessive exposure
c. Excessive backscatter
d. Insufficient backscatter
Q. A term which refers to the sharpness of the radiographic image is:
a. Sensitivity
b. Halo effect
c. Shadow effect
d. Definition
Q. A dark, irregular indication which is located adjacent to the toe of the weld wouldprobably be:
a. Undercut
b. Incomplete penetration
c. Porosity
d. Tungsten inclusions
Q. A term which refers to the smallest detail visible in a radiograph is called:
a. Radiographic sensitivity
b. Radiographic contrast
c. Subject contrast
d. Film contrast
Q. Which type of gamma ray source would be used to radiograph a weld in 150 mm thicksteel plate?
a. Ir-192
b. Co-60
c. Tm-170
d. Cs-137
Q. Generally, X ray output is changed by changing the:
a. Atomic number of the anode
b. Tube current of the unit
c. Supply voltage to the unit
d. Atomic weight of the cathode