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.
| 1051. |
Lamb waves are formed in a part which has: |
| A. | A thickness greater that about ten wavelengths |
| B. | A thickness approximately equal to the wavelength |
| C. | Low acoustic impedance compared to the transducer crystal material |
| D. | A thickness of about four wavelengths |
| Answer» C. Low acoustic impedance compared to the transducer crystal material | |
| 1052. |
A linear accelerator is used to produce X rays having energy in the range of: |
| A. | Several MeV |
| B. | 50-500 keV |
| C. | 500-1000keV |
| D. | 0-50 keV |
| Answer» B. 50-500 keV | |
| 1053. |
What type of penetrant process would be best suited to an application at near freezingtemperatures? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | None of the above |
| Answer» E. | |
| 1054. |
Gamma ray or high voltage X ray radiography, using film without lead screens, islikely to result in: |
| A. | Mottling of the film |
| B. | Increased geometric unsharpness |
| C. | No apparent difference, but increased exposure time |
| D. | No apparent difference, but decreased exposure time |
| Answer» B. Increased geometric unsharpness | |
| 1055. |
The ability to detect echoes from small reflectors is called: |
| A. | Resolution |
| B. | Attenuation |
| C. | Accuracy |
| D. | Sensitivity |
| Answer» E. | |
| 1056. |
Other factors being equal, which of the following transducers would have the greatestbeam spread? |
| A. | A larger diameter transducer |
| B. | A smaller diameter transducer |
| C. | A higher frequency transducer |
| D. | None of the above has any effect |
| Answer» C. A higher frequency transducer | |
| 1057. |
How does radiation intensity change with increasing distance from the source? |
| A. | Inversely with distance |
| B. | Inversely with the square of distance |
| C. | Directly with distance |
| D. | Directly with the square of distance |
| Answer» C. Directly with distance | |
| 1058. |
Which penetrant process should be used if repeated examinations are anticipated? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» B. Water washable | |
| 1059. |
Magnetic particle inspection is not a reliable method of detecting |
| A. | Laps |
| B. | Deep seated cavities |
| C. | Cracks |
| D. | Seams |
| Answer» C. Cracks | |
| 1060. |
The temperature of water rinse used in the water washable penetrant process shouldbe: |
| A. | 60 to 110oC |
| B. | 40 to 100oC |
| C. | 16 to 43oC |
| D. | 70 to 140oC |
| Answer» D. 70 to 140oC | |
| 1061. |
Fluorescent magnetic particle indications should be inspected under |
| A. | Fluorescent light |
| B. | Any light |
| C. | Black light |
| D. | Neon light |
| Answer» D. Neon light | |
| 1062. |
Most of the energy applied to an X ray tube is converted into: |
| A. | X rays |
| B. | Light |
| C. | Heat |
| D. | Ultraviolet radiation |
| Answer» D. Ultraviolet radiation | |
| 1063. |
Higher frequency transducers are normally used: |
| A. | In contact testing applications |
| B. | In angle beam testing applications |
| C. | In immersion testing applications |
| D. | Where deeper penetration is required |
| Answer» D. Where deeper penetration is required | |
| 1064. |
A reaction which occurs when a radiation beam of 90 keV is totally absorbed by a testpiece would probably be: |
| A. | The Compton effect |
| B. | The photoelectric effect |
| C. | Pair production |
| D. | Any of the above |
| Answer» C. Pair production | |
| 1065. |
Which of the following particles would be most sensitive? |
| A. | Wet |
| B. | Dry |
| C. | Depends on the test piece permeability |
| D. | None of the above |
| Answer» C. Depends on the test piece permeability | |
| 1066. |
Why are magnetic particles available in different colours? |
| A. | For colour contrast with the part surface |
| B. | To enhance the detection of indications |
| C. | For both a and b |
| D. | Different colours are used with different magnetic flux values |
| Answer» D. Different colours are used with different magnetic flux values | |
| 1067. |
A continuous linear indication along the centre of a fillet weld would most likely be a: |
| A. | Crater crack |
| B. | Overlap |
| C. | Root indication |
| D. | None of the above |
| Answer» D. None of the above | |
| 1068. |
During excess penetrant removal, a water spray pre-rinse might be used with: |
| A. | A lipophilic emulsifier |
| B. | A hydrophilic emulsifier |
| C. | A hydrophobic emulsifier |
| D. | None of the above |
| Answer» C. A hydrophobic emulsifier | |
| 1069. |
When using prods, arc burns may be caused by which of the following? |
| A. | Dirty contact tips |
| B. | Inadequate pressure |
| C. | Too large a magnetic current |
| D. | All of the above |
| Answer» E. | |
| 1070. |
The point at which the magnetism in a material cannot be increased even though themagnetising force continues to increase is known as the: |
| A. | Salient pole |
| B. | Saturation point |
| C. | Residual point |
| D. | Remnant point |
| Answer» C. Residual point | |
| 1071. |
According to ASTM E709-95 and API, the thickness of non conductive coatings willnot exceed: |
| A. | 1-10 mm |
| B. | 2-5 mm |
| C. | 0.02-0.05 mm |
| D. | 0.001-0.004 mm |
| Answer» D. 0.001-0.004 mm | |
| 1072. |
Which of the following is a disadvantage of the dry method? |
| A. | Ease of application with portable equipment |
| B. | Superior sensitivity for fine surface cracks |
| C. | Good particle mobility with AC and HWDC |
| D. | Good sensitivity for subsurface discontinuities |
| Answer» C. Good particle mobility with AC and HWDC | |
| 1073. |
AA material used between the face of a search unit and the test surface to permit or improve the transmission of ultrasonic vibrations from the search unit to the material being tested is called: |
| A. | A wetting agent |
| B. | A couplant |
| C. | A acoustic transmitter |
| D. | A lubricant |
| Answer» C. A acoustic transmitter | |
| 1074. |
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 |
| Answer» D. The current flow in the tube | |
| 1075. |
Which of the following chemical elements are normally held to a minimum in liquidpenetrant materials, when testing stainless steel and titanium? |
| A. | Hydrogen |
| B. | Chlorine |
| C. | Carbon |
| D. | Oil |
| Answer» C. Carbon | |
| 1076. |
The typical causes for false indications are: |
| A. | Threads, keyways, splines, rough surfaces |
| B. | Sharp corners, pop rivets |
| C. | Insufficient removal of excess surface penetrant, penetrant on operators’ hands, using cloth/paper towels which are not lint free, dirty work surfaces |
| D. | Over washing with high pressure hose pipes |
| Answer» C. Insufficient removal of excess surface penetrant, penetrant on operators’ hands, using cloth/paper towels which are not lint free, dirty work surfaces | |
| 1077. |
Opposition to establishment of a magnetic field is called: |
| A. | Reluctance |
| B. | Retentivity |
| C. | Permeability |
| D. | Electromagnetism |
| Answer» B. Retentivity | |
| 1078. |
A A widening of the front surface indication, when testing a rough surface, is caused by: |
| A. | Defects in the test piece |
| B. | A coarse grain structure |
| C. | A partial reflection of ultrasonic beam side lobe energy |
| D. | Ultrasonic instrument malfunction |
| Answer» D. Ultrasonic instrument malfunction | |
| 1079. |
The most important requirement for paintbrush transducer is: |
| A. | Uniform beam intensity across the transducer |
| B. | A pinpoint focal spot |
| C. | Good horizontal linearity characteristics |
| D. | Prescribed vertical and horizontal linearity characteristics |
| Answer» B. A pinpoint focal spot | |
| 1080. |
What is the proper technique for removal of excess penetrant from a part when using awater washable penetrant process? |
| A. | Fine spray normal to the surface |
| B. | Coarse spray normal to the surface |
| C. | Fine spray at 45 degrees to the surface |
| D. | Coarse spray at 45 degrees to the surface |
| Answer» E. | |
| 1081. |
Increasing the kV setting on an X ray machine increases the: |
| A. | Penetrating power |
| B. | Short wavelength components of the X ray beam |
| C. | Radiation intensity |
| D. | All of the above |
| Answer» B. Short wavelength components of the X ray beam | |
| 1082. |
Maximum practical prod spacing for a 2000 amp unit is about: |
| A. | 100 mm |
| B. | 200 mm |
| C. | 300 mm |
| D. | 450 mm |
| Answer» C. 300 mm | |
| 1083. |
Flux density is a measure of the number of magnetic flux lines perpendicular to an area of cross-section. If a discontinuity is in the plane of the unit area, the strongest magnetic article indication will be formed when the discontinuity is: |
| A. | Inclined at 45º to the flux lines |
| B. | Parallel to the flux lines |
| C. | 90º to the flux lines |
| D. | 135º to the flux lines |
| Answer» D. 135º to the flux lines | |
| 1084. |
When a mercury vapour black light is first turned on, what minimum warm-up time is normally required? |
| A. | None |
| B. | 2 to 3 minutes |
| C. | 5 minutes |
| D. | 10 minutes |
| Answer» D. 10 minutes | |
| 1085. |
The least offensive of the following welding discontinuities would probably be: |
| A. | Incomplete penetration |
| B. | Lack of fusion |
| C. | Slag inclusions |
| D. | Porosity |
| Answer» E. | |
| 1086. |
All other factors being equal, which of the following modes of vibration has the greatestvelocity? |
| A. | Shear wave |
| B. | Transverse wave |
| C. | Surface wave |
| D. | Longitudinal wave |
| Answer» E. | |
| 1087. |
An inspection for surface and subsurface discontinuities in ferromagnetic welds wouldbest be accomplished by which of the following techniques? |
| A. | Prods |
| B. | AC yoke |
| C. | Half wave DC yoke |
| D. | None of the above |
| Answer» B. AC yoke | |
| 1088. |
The act of determining the cause of an indication is called |
| A. | Interpretation |
| B. | Inspection |
| C. | Evaluation |
| D. | Determination |
| Answer» B. Inspection | |
| 1089. |
Definition is defined as the measure of the of the outline of theimage in the radiograph. |
| A. | Density |
| B. | Sensitivity |
| C. | Sharpness |
| D. | Latitude |
| Answer» D. Latitude | |
| 1090. |
A water tolerance test would be performed on: |
| A. | Solvent removable penetrants |
| B. | Water washable and post emulsifiable penetrant |
| C. | Solvent removable penetrants and hydrophilic emulsifiers |
| D. | Water washable penetrants and lipophilic emulsifiers |
| Answer» E. | |
| 1091. |
When a casting is being non destructively examined for critical service, and thepossibility of cracks exists, which of the following techniques would be best? |
| A. | X ray radiography at 200 kV or less |
| B. | Magnetic Particle or Liquid Penetrant testing |
| C. | Radiography (X or gamma ray, depending on the thickness) |
| D. | Radiography and either Magnetic Particle or liquid Penetrant testing |
| Answer» C. Radiography (X or gamma ray, depending on the thickness) | |
| 1092. |
What type of solvent removers may be used with a solvent removable penetrant? |
| A. | Any organic solvent |
| B. | Only the cleaner recommended by the manufacturer of the penetrant |
| C. | Any alcohol based solvents |
| D. | Only chlorinated hydrocarbons |
| Answer» C. Any alcohol based solvents | |
| 1093. |
Which of the following methods is not recommended for pre-cleaning prior to a liquidpenetrant test: |
| A. | Steam cleaning, etching, rust and paint removal |
| B. | Solvent wipe, vapour degreasing, ultrasonic bath cleaning |
| C. | Blasting, grinding, filing, honing, machining |
| D. | All of the listed methods are not recommended |
| Answer» E. | |
| 1094. |
Which of the following search units would contain the thinnest quartz crystal? |
| A. | A 1 MHz search unit |
| B. | A 5 MHz search unit |
| C. | A 15 MHz search unit |
| D. | A 25 MHz search unit |
| Answer» E. | |
| 1095. |
With longitudinal wave incident at angles between the first and second critical angles: |
| 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» C. Shear waves and longitudinal waves are produced in the second material | |
| 1096. |
Ultrasonic testing of material where the search unit is in direct contact with thematerial being tested may be: |
| A. | Straight beam testing |
| B. | Surface wave testing |
| C. | Angle beam testing |
| D. | All of the above |
| Answer» E. | |
| 1097. |
Surrounding an electromagnet, the magnetic field is strongest: |
| A. | Immediately after the current ceases to flow |
| B. | While the magnetizing current ceases to flow |
| C. | At the time the magnetic particles are applied to the part |
| D. | Just prior to current reversal |
| Answer» E. | |
| 1098. |
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 |
| Answer» B. Half-life of the source | |
| 1099. |
Inspection of castings is often impractical because of: |
| A. | Extremely small grain structure |
| B. | Coarse grain structure |
| C. | Uniform flow lines |
| D. | Uniform velocity of sound |
| Answer» C. Uniform flow lines | |
| 1100. |
The specific activity of radioactive isotopes is measured in: |
| A. | MeV (million electron volts) |
| B. | R/h (roentgens per hour) or gray per hour |
| C. | Ci/g (curies per gram) or Becquerel per gram |
| D. | Counts per minute (c/min) |
| Answer» D. Counts per minute (c/min) | |