MCQOPTIONS
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MCQOPTIONS
This section includes 1267 Mcqs, each offering curated multiple-choice questions to sharpen your Embedded Systems knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
Ultrasonic testing is: |
| A. | Mechanical energy with a speed of propagation faster than the speed of sound |
| B. | Sound which has a frequency or pitch above the range of the human ear |
| C. | The science of discontinuity detection using ultrasonic sound |
| D. | Mechanical vibrations below the frequency of human hearing |
| Answer» C. The science of discontinuity detection using ultrasonic sound | |
| 902. |
Which of the following cast materials could most likely be successfully ultrasonicallytested? |
| A. | Low carbon steel |
| B. | Stainless steel |
| C. | Iron |
| D. | Pure lead |
| Answer» B. Stainless steel | |
| 903. |
The important difference between AC and DC current for magnetic particle testingpurposes is: |
| A. | The skin effect caused by DC adds mobility to the magnetic particles |
| B. | The resulting AC magnetic fields are more difficult to demagnetize |
| C. | The DC magnetic fields are more penetrating |
| D. | The AC magnetic fields are stronger |
| Answer» D. The AC magnetic fields are stronger | |
| 904. |
Magnetic particle is a non-destructive examination method used for: |
| A. | Locating surface discontinuities |
| B. | Near surface discontinuities |
| C. | Both a and b |
| D. | Material separation |
| Answer» D. Material separation | |
| 905. |
Most commercial ultrasonic testing is performed at frequencies between: |
| A. | 1 MHz and 10 MHz |
| B. | 1 MHz and 100 MHz |
| C. | 10 MHz and 50 MHz |
| D. | 1 MHz and 25 MHz |
| Answer» E. | |
| 906. |
A A disadvantage of using a low frequency ultrasonic transducer is: |
| A. | It provides better penetration in most materials |
| B. | It provides poorer penetration in most materials |
| C. | It provides a smaller beam angle and poorer resolving power |
| D. | It provides a larger beam angle and poorer resolving power |
| Answer» D. It provides a larger beam angle and poorer resolving power | |
| 907. |
A smooth flat discontinuity whose major plane is not perpendicular to the direction ofsound propagation may be indicated by: |
| A. | An echo amplitude comparable in magnitude to the back surface reflection |
| B. | A complete loss of back surface reflection |
| C. | An echo amplitude larger in magnitude than the back surface reflection |
| D. | All of the above |
| Answer» C. An echo amplitude larger in magnitude than the back surface reflection | |
| 908. |
When a mercury vapour black light is inadvertently cut off, approximately how long should it be allowed to cool before attempting to restart? |
| A. | Not required |
| B. | 2 to 3 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» D. 10 minutes | |
| 909. |
Which exposure factors are recorded in the process of making a step wedge analysis? |
| A. | Voltage and exposure |
| B. | Source-to-film distance and film |
| C. | Film density and materials |
| D. | All of the above |
| Answer» E. | |
| 910. |
An oscilloscope display in which the screen base line is adjusted to represent the oneway distance in a test piece is called a: |
| A. | A scan display |
| B. | B scan display |
| C. | C scan display |
| D. | D scan display |
| Answer» C. C scan display | |
| 911. |
A magnetic particle build-up from a discontinuity is strongest when the discontinuityis oriented: |
| A. | 180o to the magnetic field |
| B. | 45o to the magnetic field |
| C. | 90o to the magnetic field |
| D. | 90o to the current flow |
| Answer» D. 90o to the current flow | |
| 912. |
Y cut crystals produce: |
| A. | Longitudinal waves |
| B. | Shear waves |
| C. | Lamb waves |
| D. | Surface waves |
| Answer» C. Lamb waves | |
| 913. |
Which of the following would not be considered a film artifact? |
| A. | Sugar |
| B. | Chemical streaks |
| C. | PI lines |
| D. | Pressure marks |
| Answer» B. Chemical streaks | |
| 914. |
A straight, dark line in the centre of the film of a weld cap would probably be: |
| A. | Porosity |
| B. | Undercut |
| C. | Tungsten inclusions |
| D. | A linear crack |
| Answer» E. | |
| 915. |
The ‘multi-film’ technique may be used when one radiograph film does not haveenough to produce a satisfactory radiograph of a specimen. |
| A. | Latitude |
| B. | Definition |
| C. | Graininess |
| D. | Activity |
| Answer» B. Definition | |
| 916. |
Entry surface resolution is a characteristic of an ultrasonic testing system whichdefines its ability to: |
| A. | Detect discontinuities oriented in a direction parallel to the ultrasonic beam |
| B. | Detect discontinuities located in the center of a forging containing a fine metallurgical structure |
| C. | Detect minute surface scratches |
| D. | Detect discontinuities located just beneath the entry surface in the part being tested |
| Answer» E. | |
| 917. |
Which of the following metals must be tested with low halogen sulphur free penetrantmaterials: |
| A. | Copper, silver, gold |
| B. | Nickel based alloys, certain stainless steel materials |
| C. | Steel, iron, aluminium |
| D. | Plastic, wood, paper |
| Answer» E. | |
| 918. |
The following precautions must be observed when removing the excess surfacepenetrant with a water wash method using a hose pipe: |
| A. | The wash angle should be at 45o |
| B. | A coarse droplet spray |
| C. | Temperature of water 16 to 43oC |
| D. | Pressure as low as possible not to exceed 50 psi |
| Answer» C. Temperature of water 16 to 43oC | |
| 919. |
For direct contact magnetising methods, the magnetic field is oriented in what directionrelative to the current direction? |
| A. | Parallel |
| B. | At 45 degrees |
| C. | At 90 degrees |
| D. | At 180 degrees |
| Answer» D. At 180 degrees | |
| 920. |
Which of the following would be detrimental to radiographic image sharpness? |
| A. | Small focal spot |
| B. | Large film focal distance |
| C. | Large object to film distance |
| D. | None of the above |
| Answer» D. None of the above | |
| 921. |
Typical frequencies which might be used to perform ultrasonic testing of ferrous andnon-ferrous welds are: |
| A. | 25 to 100 kHz |
| B. | 200 to 5 MHz |
| C. | 1 MHz to 5 MHz |
| D. | 2.25 MHz to 10 MHz |
| Answer» D. 2.25 MHz to 10 MHz | |
| 922. |
Higher X ray tube voltages result in: |
| A. | Shorter wavelengths X rays |
| B. | More penetrating X rays |
| C. | Higher intensity X ray beam |
| D. | All of the above |
| Answer» E. | |
| 923. |
The particle motion for compression waves is: |
| A. | Parallel to wave propagation |
| B. | Transverse to wave propagation |
| C. | Elliptical |
| D. | Circular |
| Answer» B. Transverse to wave propagation | |
| 924. |
Poor contact between lead screens and film is likely to cause: |
| A. | An indistinct or ‘fuzzy’ image |
| B. | A mottled appearance on the film |
| C. | ‘Undercut’ of the test piece image |
| D. | Increased geometric unsharpness |
| Answer» B. A mottled appearance on the film | |
| 925. |
The most important factor in limiting radiation exposure is: |
| A. | Time |
| B. | Distance |
| C. | Shielding |
| D. | All of the above |
| Answer» E. | |
| 926. |
In immersion testing, verification that the search unit is normal to a flat entry surfaceis indicated by: |
| A. | Maximum reflection from the entry surface |
| B. | Proper wavelength |
| C. | Maximum amplitude of the initial pulse |
| D. | Elimination of water multiples |
| Answer» B. Proper wavelength | |
| 927. |
The half-life of Cs-137 is approximately: |
| A. | 74 days |
| B. | 129 days |
| C. | 5.3 years |
| D. | 30.1 years |
| Answer» E. | |
| 928. |
The preferred method of application of aqueous wet developer is: |
| A. | Dipping |
| B. | Spraying |
| C. | Brushing |
| D. | All of the above |
| Answer» E. | |
| 929. |
One of the most apparent characteristics of a discontinuity echo, as opposed to a nonrelevant indication is: |
| A. | Lack of repeatability |
| B. | Sharp, distinct signal |
| C. | Stable position with fixed transducer position |
| D. | High noise level |
| Answer» C. Stable position with fixed transducer position | |
| 930. |
When an ultrasonic beam passes through the interface between two dissimilar materialsat an angle, a new angle of sound travel is formed in the second material due to: |
| A. | Attenuation of ultrasound |
| B. | Transmission of ultrasound |
| C. | Compression of ultrasound |
| D. | Refraction |
| Answer» E. | |
| 931. |
A method of compensating for the ‘dead zone’ or near surface resolution problems isto: |
| A. | Inspect all areas of the test piece twice to assure repeatability of indications |
| B. | Re-inspect from the opposite side of the test piece if geometry permits |
| C. | Re-inspect using a higher energy pulse |
| D. | Re-inspect using a higher frequency transducer that does not have a ‘dead |
| Answer» C. Re-inspect using a higher energy pulse | |
| 932. |
When a longitudinal wave is incident upon an inclined interface between zero degreesand the first critical angle: |
| A. | The sound beam is totally reflected |
| B. | Only shear waves are produced in the second material |
| C. | Shear waves and longitudinal waves are produced in the second material |
| D. | Only longitudinal waves are produced in the second material |
| Answer» D. Only longitudinal waves are produced in the second material | |
| 933. |
Which type of developer should not be used with a visible dye penetrant process? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water soluble |
| D. | Water suspendable |
| Answer» B. Non-aqueous wet | |
| 934. |
The average energy of a Cs-137 source is approximately: |
| A. | 60-80 keV |
| B. | 660 keV |
| C. | 400 keV |
| D. | 1.2 MeV |
| Answer» C. 400 keV | |
| 935. |
Attenuation is made up of: |
| A. | Diffusion and absorption |
| B. | Scatter and reflection |
| C. | Absorption and scatter |
| D. | Reflection at grain boundaries |
| Answer» D. Reflection at grain boundaries | |
| 936. |
Which of the following developers is applied by spray only? |
| A. | Non-aqueous wet |
| B. | Water based wet |
| C. | Dry |
| D. | Dual sensitivity |
| Answer» B. Water based wet | |
| 937. |
During immersion ultrasonic testing of pipe or tubing, spurious echoes may be causedby: |
| A. | Dirt on the test piece |
| B. | Grease on the test piece |
| C. | Air bubbles on the test piece |
| D. | All of the above |
| Answer» E. | |
| 938. |
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 |
| Answer» E. | |
| 939. |
When performing a post emulsifiable penetrant test, the test piece does not rinse acceptable clean during normal processing. What should be done? |
| A. | Return the test piece to the emulsifier and repeat the step |
| B. | Increase water temperature and pressure |
| C. | Remove the excess penetrant with solvent remover and process the remainder of the test normally |
| D. | Clean the test piece and re-process through the complete penetrant test process |
| Answer» E. | |
| 940. |
When a probe is coupled to a solid, strong surface waves may be produced: |
| A. | If a high frequency probe is used |
| B. | If the probe has only incomplete contact with the surface |
| C. | If the probe is large in diameter |
| D. | None of the above |
| Answer» E. | |
| 941. |
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 |
| Answer» E. | |
| 942. |
The most common biological effect of penetrant materials on personnel is: |
| A. | Burns to the retina of the eye from over exposure to ultraviolet light |
| B. | Skin irritation caused by removal of natural oils from the skin |
| C. | Acute chlorine poisoning |
| D. | No effect |
| Answer» C. Acute chlorine poisoning | |
| 943. |
The purpose of adding a wetting agent to an immersion bath is: |
| A. | To make sure the bath is wet |
| B. | To reduce corrosive properties of the bath |
| C. | To eliminate air bubbles in the bath |
| D. | To prevent rust |
| Answer» D. To prevent rust | |
| 944. |
Which penetrant process is best suited to high production rates of many small parts? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» C. Post emulsifiable | |
| 945. |
The three most common modes of sound vibration are: |
| A. | Longitudinal, compressional, and transverse waves |
| B. | Longitudinal, transverse and rayleigh waves |
| C. | Transverse, longitudinal and shear waves |
| D. | Transverse, shear waves and rayleigh waves |
| Answer» C. Transverse, longitudinal and shear waves | |
| 946. |
Most significant difference in two X ray beams produced at different mA settings is: |
| A. | Penetrating power |
| B. | Wavelength distribution |
| C. | X ray quality |
| D. | Beam intensity |
| Answer» E. | |
| 947. |
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 |
| Answer» D. Too small a source size | |
| 948. |
A radiographic sensitivity level of 2-2T means that: |
| A. | The #2 hole in a #2 penetrameter must be visible on the film |
| B. | The 2T hole in a penetrameter which is 2% of the test piece thickness must be visible on the film |
| C. | The 2T hole in a #2 penetrameter must be visible on the film |
| D. | Two penetrameters which are each 2% of the test piece thickness must be used |
| Answer» C. The 2T hole in a #2 penetrameter must be visible on the film | |
| 949. |
How is the wavelength of scattered radiation related to the primary beam? |
| A. | Longer |
| B. | Shorter |
| C. | Same |
| D. | Not related |
| Answer» B. Shorter | |
| 950. |
Which of the following types of intensifying screens are used in industrial radiography? |
| A. | Lead |
| B. | Fluorescent |
| C. | Lead oxide |
| D. | All of the above |
| Answer» B. Fluorescent | |