Top 150+ Solved Magnetic Particle Testing Level 1 MCQ Questions Answer
Q. Which of the following is an advantage of the dry method
a. Good sensitivity for subsurface discontinuities
b. Faster than wet method for quantities of small test pieces
c. Easily applied in an automated system
d. Easy coverage of surfaces of irregularly shaped test pieces
Q. Loss of fine particle sizes due to re-use of dry particles would probably lead to:
a. Loss of sensitivity to larger discontinuities
b. Loss of sensitivity to finer discontinuities
c. Unpredictable results
d. Slower inspection speeds
Q. Which of the following is a disadvantage of the wet method?
a. It is the most sensitive method for detection of very fine surface cracks
b. Rapid testing of large quantities of small test pieces
c. Readily adaptable to mechanised equipment
d. Excellent detection of completely subsurface discontinuities
Q. Which of the following is an advantage of the wet method?
a. Excellent detection of completely subsurface discontinuities
b. Ease of bath recovery and re-use
c. Low flash point ensures freedom from fire hazards
d. Relatively clean and easy to work with
Q. The primary reason for using water rather than oil as a suspension medium for wetmethod baths is that:
a. Water is more chemically inert than oil
b. Bath flammability hazards are eliminated
c. Water has the capability to dissolve the needed rust inhibitors
d. Water baths may be used at lower temperatures than oil baths
Q. A disadvantage of fluorescent magnetic particles is:
a. Darkened area and black light are required
b. Abnormally high sensitivity
c. Only dry particles are available
d. Only wet concentrate is available
Q. A common physiological effect of black light inspection on the inspector is:
a. Burned retinas of the eyes
b. Rejected cornea syndrome
c. Eye fatigue
d. Retarded iris control
Q. A common physiological effect of black light inspection on the inspector is:
a. Burned retinas of the eyes
b. Rejected cornea syndrome
c. Eyeball fluorescence
d. Retarded iris control
Q. Which of the following represents ultraviolet light of wavelengths which arepotentially injurious (1 Å = 10-10m)
a. 2000 to 3200Å
b. 3200 to 4000 Å
c. 4000 to 4600Å
d. 4600 to 5200 Å
Q. Dyes which receive light at one wavelength and re-emit light of another wavelengthare called:
a. L.E.Ds
b. Phosphorescent
c. Luminescent
d. Fluorescent
Q. Most fluorescent dyes used for magnetic particle testing fluoresce what colour?
a. Blue green
b. Yellow green
c. Blue black
d. Red orange
Q. The best available source of black light for inspection is:
a. The mercury vapour lamp
b. The fluorescent tube
c. The incandescent bulb
d. Sunlight
Q. Which of the following would be likely to cause variations in the output of aninspection black light?
a. Voltage fluctuations
b. Aged bulb
c. Dirty filter
d. All of the above
Q. The temperature above which steels become nonmagnetic is called the:
a. Zero retentivity
b. Curie point
c. Demagnetisation temperature
d. Random polar point
Q. The temperature above which most soft steels become nonmagnetic is about:
a. 440ºC(770oF)
b. 523ºC (975ºF)
c. 626ºC (1160ºF)
d. 754ºC (1390ºF)