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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.
| 851. |
Methylene chloride, isopropyl, alcohol, naptha and mineral spirits are examples of: |
| A. | Emulsifiers |
| B. | Developers |
| C. | Solvent removers |
| D. | None of the above |
| Answer» D. None of the above | |
| 852. |
When variations are noticed in the front surface reflection, the test piece should beinspected for possible near surface discontinuities by: |
| A. | Using a lower frequency transducer |
| B. | Using a higher pulse energy |
| C. | Inspecting from the opposite side |
| D. | Calibrating on a smaller diameter flat bottom hole |
| Answer» D. Calibrating on a smaller diameter flat bottom hole | |
| 853. |
Mercury vapour black lights may be extinguished if the supply voltage drops belowabout: |
| A. | 120 volts |
| B. | 90 volts |
| C. | 220 volts |
| D. | 200 volts |
| Answer» E. | |
| 854. |
Which of the following is a disadvantage of a hydrophilic emulsifier? |
| A. | Greater penetrant tolerance than lipophilic emulsifiers |
| B. | Economical |
| C. | Low drag-out losses compared to lipophilic emulsifiers |
| D. | none |
| Answer» C. Low drag-out losses compared to lipophilic emulsifiers | |
| 855. |
Deterioration of penetrant material performance may be caused by which of thefollowing? |
| A. | Water contamination |
| B. | Heat |
| C. | Cleaning solvents |
| D. | All of the above |
| Answer» E. | |
| 856. |
Most industrial X ray machines contain targets made of: |
| A. | Beryllium |
| B. | Magnesium |
| C. | Lead |
| D. | Tungsten |
| Answer» E. | |
| 857. |
Which of the following developers requires the test piece to be dried prior to itsapplication? |
| A. | Water washable |
| B. | Water suspendable |
| C. | Non-aqueous suspendable |
| D. | All of the above |
| Answer» D. All of the above | |
| 858. |
Lead foil in direct contact with the film in a cassette absorbs: |
| A. | All radiation to protect the film from exposure |
| B. | Light rays that might otherwise expose the film |
| C. | Long wave length radiation more than short wavelength |
| D. | Short wavelength radiation more than long wavelength |
| Answer» D. Short wavelength radiation more than long wavelength | |
| 859. |
The intensifying effects of fluorescent screens are caused by: |
| A. | Electron emission |
| B. | Light emission |
| C. | Secondary X rays |
| D. | All of the above |
| Answer» C. Secondary X rays | |
| 860. |
The range of the specimen thickness that can be adequately recorded on a radiographis known as the of the radiograph. |
| A. | Sensitivity |
| B. | Latitude |
| C. | Accuracy |
| D. | Intensity |
| Answer» C. Accuracy | |
| 861. |
A radiograph is made using film X with an exposure of 10 mA-min. Film density in the area of interest is 1.0. If it is desired to achieve a density of 2.0 in the area of interest, what exposure is required? (Log relative exposure = 1.1 for a density of 1.0 and 1.62 for a density of 2.0) |
| A. | 41.67 mA-min |
| B. | 10 mA-min |
| C. | 12.6 mA-min |
| D. | 33.1 mA-min |
| Answer» E. | |
| 862. |
Lead screens act as intensifiers at voltage above: |
| A. | 1000 kV |
| B. | 150 kV |
| C. | 325 kV |
| D. | 2000 kV` |
| Answer» C. 325 kV | |
| 863. |
A longitudinal surface crack in a circularly magnetised part will cause: |
| A. | The magnetic field to die out |
| B. | A decrease in permeability |
| C. | A magnetic leakage field |
| D. | A current to flow |
| Answer» D. A current to flow | |
| 864. |
According to ASTM E709-95 and API, the UV intensity measured at a minimum of 38cm (15 inches) at least shall not be less than: |
| A. | 700 µW/cm2 |
| B. | 800 µW/cm2 |
| C. | 900 µW/cm2 |
| D. | 1000 µW/cm2 |
| Answer» E. | |
| 865. |
Which technique is the most sensitive? |
| A. | Continuous |
| B. | Residual |
| C. | Interrupted |
| D. | Counter current |
| Answer» B. Residual | |
| 866. |
Another name for a self-emulsifying penetrant process is: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Solvent emulsifiable |
| Answer» C. Post emulsifiable | |
| 867. |
Which type of current has a ‘skin effect’: |
| A. | AC |
| B. | DC |
| C. | Half wave rectified |
| D. | Full wave rectified |
| Answer» B. DC | |
| 868. |
Which of the following discontinuities would you not expect to find in a casting? |
| A. | Shrinkage cracks |
| B. | Incomplete penetration |
| C. | Cold shuts |
| D. | Porosity |
| Answer» D. Porosity | |
| 869. |
An advantage of immersion testing is that: |
| A. | Large parts are easily inspected |
| B. | Most test systems are easily transported in the field |
| C. | High test frequencies may be used |
| D. | Most test systems are not easily transported in the field |
| Answer» D. Most test systems are not easily transported in the field | |
| 870. |
The penetrant process best suited to use on parts with rough surfaces is: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Magnetic particle |
| Answer» C. Post emulsifiable | |
| 871. |
An instrument display in which the horizontal base line represents elapsed time andthe vertical deflection represents signal amplitudes is called: |
| A. | A scan |
| B. | B scan |
| C. | C scan |
| D. | A time line display |
| Answer» B. B scan | |
| 872. |
X ray intensity is a function of : |
| A. | Cathode current |
| B. | Step down ratio of the filament transformer |
| C. | The distance from the test piece |
| D. | Size of the anode (target) |
| Answer» B. Step down ratio of the filament transformer | |
| 873. |
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 |
| Answer» C. R/h (Roentgens per hour or gray per hour | |
| 874. |
The strength of a magnetic field within a coil is determined by: |
| A. | The current in the coil |
| B. | The number of turns in the coil\ |
| C. | The diameter of the coil |
| D. | All of the above factors |
| Answer» E. | |
| 875. |
As transducer crystal thickness decreases: |
| A. | Transducer wavelength increases |
| B. | Frequency decreases |
| C. | Frequency increases |
| D. | None of the above |
| Answer» D. None of the above | |
| 876. |
A problem which could be caused by a penetrant with abnormally high water contentis: |
| A. | Hydrogen assisted cracking |
| B. | Rusting of steel parts |
| C. | Water contamination |
| D. | Blurring of indications |
| Answer» C. Water contamination | |
| 877. |
A magnetic particle indication is sharp and very fine; this suggests that thediscontinuity is: |
| A. | Subsurface seam |
| B. | A shallow, tight surface crack |
| C. | Porosity |
| D. | A deep crack |
| Answer» C. Porosity | |
| 878. |
The statement ‘magnetic particle testing can be applied to plated and painted parts’. |
| A. | May be true depending upon the thickness of the coating |
| B. | May be true if flux densities are increased to compensate for the coating thickness |
| C. | Is true only for circular circumstances |
| D. | Both (a) and (b) |
| Answer» B. May be true if flux densities are increased to compensate for the coating thickness | |
| 879. |
The ability to separate echos from reflectors close together in depth is called: |
| A. | Resolution |
| B. | Attenuation |
| C. | Accuracy |
| D. | Sensitivity |
| Answer» B. Attenuation | |
| 880. |
Emulsification time is less critical for the detection of: |
| A. | Fine, tight cracks |
| B. | Wide, shallow discontinuities |
| C. | Internal porosity |
| D. | None of the above |
| Answer» B. Wide, shallow discontinuities | |
| 881. |
To provide reliability and reproducibility in magnetic particle testing, writtenprocedures should include: |
| A. | Location of the coil and current for each magnetization |
| B. | Requirements for ammeter calibration |
| C. | Type and concentration of the particles |
| D. | All of the above |
| Answer» E. | |
| 882. |
Continuous magnetization provides the most sensitivity because: |
| A. | The magnetic particles are present while the part is being magnetized |
| B. | The magnetic field is greatest while the magnetizing current is on |
| C. | All of the above |
| D. | Neither of the above |
| Answer» D. Neither of the above | |
| 883. |
The main disadvantage of having a small focal spot on an X ray tube is: |
| A. | Heat is conducted away too fast |
| B. | Sharper radiographic images may be achieved with a larger focal spot |
| C. | A smaller focal spot is limited to lower tube currents because of the potential damage from overheating |
| D. | None of the above |
| Answer» D. None of the above | |
| 884. |
Which of the following will best define surface cracks? |
| A. | Half wave rectified AC |
| B. | DC |
| C. | AC |
| D. | Surge current |
| Answer» D. Surge current | |
| 885. |
It is easier to control developer coating thickness with a soluble developer than a watersuspendable one because: |
| A. | Less developer can be dissolved that suspended in water |
| B. | It dries more rapidly on the test piece |
| C. | Evaporation deposits a thin, even coating on the test piece |
| D. | All of the above |
| Answer» E. | |
| 886. |
Indications which are caused by something other than a discontinuity are called: |
| A. | Relevant |
| B. | Non-relevant |
| C. | False |
| D. | Real |
| Answer» C. False | |
| 887. |
Scattering of an ultrasonic beam is most pronounced when: |
| A. | Material grain size and wavelength are comparable |
| B. | Low frequency transducers are used |
| C. | Large wavelengths are used for ultrasonic testing |
| D. | None of the above |
| Answer» B. Low frequency transducers are used | |
| 888. |
Betatrons are 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 | |
| 889. |
Which one of the following steps is necessary to dissolve the undarkened silver saltcrystals in the film emulsion: |
| A. | Developing |
| B. | Fixing |
| C. | Washing |
| D. | None of the above |
| Answer» C. Washing | |
| 890. |
When is it possible to detect slightly sub-surface defects using penetrant testing? |
| A. | Only if you are using fluorescent penetrant |
| B. | When using post-emulsifiable penetrant |
| C. | It is not possible to detect slightly sub-surface defects using penetrant testing |
| D. | When using dual sensitivity penetrants |
| Answer» D. When using dual sensitivity penetrants | |
| 891. |
Which of the following is classified as electromagnetic radiation? |
| A. | Visible light |
| B. | X rays |
| C. | Infrared radiation |
| D. | All of the above |
| Answer» E. | |
| 892. |
When a sound beam is reflected: |
| A. | The angle of reflection is found using Snell's law |
| B. | The angle of reflection equals the angle of incidence |
| C. | All the sound energy is reflected unless the acoustic impedanmce is zero |
| D. | Beam spread is decreased |
| Answer» C. All the sound energy is reflected unless the acoustic impedanmce is zero | |
| 893. |
Of the following radiographic sources, which emits the most penetrating radiation? |
| A. | Co-60 |
| B. | Ra-226 |
| C. | Cs-137 |
| D. | Ir-192 |
| Answer» B. Ra-226 | |
| 894. |
The term is used to refer to the product of wave velocity and density is: |
| A. | Acoustic impedance |
| B. | The velocity-density ratio |
| C. | Index of refraction |
| D. | Reflection co-efficient |
| Answer» B. The velocity-density ratio | |
| 895. |
Which of the following is the correct formula to use for calculating geometric unsharpness if F=source size, T=specimen thickness, D=source to object distance and Ug=geometric unsharpness: |
| A. | Ug = FD/T |
| B. | Ug = DT/F |
| C. | Ug = FT/D |
| D. | Ug = FTD |
| Answer» D. Ug = FTD | |
| 896. |
During the manufacturing of a casting, the purpose of a riser is: |
| A. | To introduce molten metal into the mould |
| B. | To provide additional molten metal to allow for shrinkage during solidification |
| C. | To allow excess heat to escape during solidification |
| D. | To provide a vent for excess steam to escape |
| Answer» C. To allow excess heat to escape during solidification | |
| 897. |
Dried, non-aqueous developers are best removed after penetrant testing by: |
| A. | Solvent cleaning |
| B. | Wiping with a water dampened cloth |
| C. | Wiping with a dry towel |
| D. | Any of the above |
| Answer» E. | |
| 898. |
A magnetic field which is contained completely within the test piece is called a: |
| A. | Confined field |
| B. | Longitudinal field |
| C. | Circular field |
| D. | Saturated field |
| Answer» D. Saturated field | |
| 899. |
Contrast is defined as the comparison between on different areas ofthe radiograph: |
| A. | Density |
| B. | Sensitivity |
| C. | Sharpness |
| D. | Latitude |
| Answer» B. Sensitivity | |
| 900. |
A noisy base line, or hash may result in: |
| A. | Laminations in the test piece |
| B. | Discontinuities at an angle to the test piece surface |
| C. | Large grain size |
| D. | Fatigue cracks |
| Answer» D. Fatigue cracks | |