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.
| 951. |
Which form of magnetisation is easiest to control in most parts? |
| A. | Longitudinal magnetisation |
| B. | Permanent magnetism |
| C. | Circular magnetization |
| D. | Parallel magnetization |
| Answer» B. Permanent magnetism | |
| 952. |
The fluorescent dyes used in the liquid penetrant testing process are most active whenenergised with black light of what wavelengths? (Å stands for angstrom units) |
| A. | 2.0 × 10-7m (2000Å) |
| B. | 2.5 × 10-7m (2500 Å) |
| C. | 3.25 × 10-7m (3250Å) |
| D. | 3.65 × 10-7m (3650 Å) |
| Answer» E. | |
| 953. |
Which of the following describes the best technique for applying dry magneticparticles to a test piece? |
| A. | Dip the test piece in a tank of dry particles while current is flowing |
| B. | Apply with an electrostatic spray gun at approximately 30 PSIG |
| C. | Gently pour the powder onto the test piece |
| D. | Shake or dust the powder onto the test piece with minimum velocity |
| Answer» E. | |
| 954. |
A common rule of thumb to use for current required in circular magnetisation: |
| A. | 1000 amps/25mm of diameter |
| B. | 1000 ampere turns/25mm of diameter |
| C. | 1000 amps/25mm of prod spacing |
| D. | None of the above |
| Answer» C. 1000 amps/25mm of prod spacing | |
| 955. |
To detect lengthwise defects on the inside diameter of hollow parts, you should: |
| A. | Pass current through it |
| B. | Magnetise with a coil |
| C. | Pass current through a central conductor |
| D. | Increase the amperage used |
| Answer» D. Increase the amperage used | |
| 956. |
The magnetic field is the strongest when: |
| A. | The magnetising current is flowing |
| B. | The magnetising voltage is applied |
| C. | The leakage field is flowing |
| D. | The magnetising current is off |
| Answer» B. The magnetising voltage is applied | |
| 957. |
Which of the following is an advantage of X ray over gamma ray sources forradiography? |
| A. | Portability |
| B. | Required maintenance |
| C. | Variable radiation energy |
| D. | All of the above |
| Answer» D. All of the above | |
| 958. |
Which type of casting is made in a metal mould? |
| A. | Investment casting |
| B. | Sand casting |
| C. | Die casting |
| D. | Lost wax process |
| Answer» D. Lost wax process | |
| 959. |
What action is necessary if the penetrant is inadvertently allowed to dry on the testpiece? |
| A. | Repeat the test, beginning with the pre-cleaning operation |
| B. | Re-wet the penetrant, begin dwell time again and continue |
| C. | Clean the penetrant off the surface and develop normally |
| D. | Clean the penetrant off the surface, wait 5 minutes and develop normally |
| Answer» B. Re-wet the penetrant, begin dwell time again and continue | |
| 960. |
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 |
| Answer» B. Abnormally high sensitivity | |
| 961. |
Penetrant testing is limited by its inability to test which of the following materials: |
| A. | Aluminium |
| B. | Ceramics |
| C. | Porous materials |
| D. | Moulded rubber |
| Answer» E. | |
| 962. |
Why is it important to view the test piece shortly after developer application andperiodically through the development time? |
| A. | To make sure the developer dries evenly |
| B. | To guard against pooling of developer in low areas |
| C. | To avoid missing small flaw indications adjacent to areas of high bleed-out |
| D. | To avoid missing transient indications against an otherwise clean background |
| Answer» D. To avoid missing transient indications against an otherwise clean background | |
| 963. |
The colour of fluorescent penetrant under the presence of a UV light is: |
| A. | Yellow-green |
| B. | Red |
| C. | Blue |
| D. | Green |
| Answer» B. Red | |
| 964. |
Demagnetisation with reversing DC is more effective than AC because: |
| A. | DC is more penetrating |
| B. | Demagnetisation is assisted by the skin effect |
| C. | DC is more direct |
| D. | Not true - AC is more effective |
| Answer» B. Demagnetisation is assisted by the skin effect | |
| 965. |
How is the size of a liquid penetrant indication usually related to the discontinuity itrepresents: |
| A. | Larger than |
| B. | Smaller than |
| C. | Equal to |
| D. | Not related to |
| Answer» B. Smaller than | |
| 966. |
In an A scan presentation, the horizontal base line represents the: |
| A. | Amount of refracted ultrasonic sound energy |
| B. | Distance traveled by the search unit |
| C. | Elapsed time or distance |
| D. | None of the above |
| Answer» D. None of the above | |
| 967. |
The causes of non relevant indications are: |
| A. | Insufficient removal of excess surface penetrant |
| B. | Penetrant on operators hands |
| C. | Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces |
| D. | Contaminated work surfaces |
| Answer» D. Contaminated work surfaces | |
| 968. |
A linear accelerator is used to produce X rays in what range? |
| A. | Several MeV |
| B. | 50-500 keV |
| C. | 500-1000keV |
| D. | 0-50 keV |
| Answer» B. 50-500 keV | |
| 969. |
An effective method of recognising a film artifact is: |
| A. | Viewing a film in daylight |
| B. | Viewing film in reflected light from a viewer |
| C. | Comparing both film shot with a double film technique |
| D. | All of the above |
| Answer» C. Comparing both film shot with a double film technique | |
| 970. |
Which of the following materials would probably require testing at the lowestfrequency? |
| A. | Small grained mild steel |
| B. | Mild steel castings |
| C. | Mild steel forgings |
| D. | Cast iron |
| Answer» E. | |
| 971. |
A A second name for Rayleigh waves is: |
| A. | Shear waves |
| B. | Longitudinal waves |
| C. | Transverse waves |
| D. | Surface waves |
| Answer» E. | |
| 972. |
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 |
| Answer» B. Radiographic contrast | |
| 973. |
A calibration for immersion ultrasonic testing of pipe or tubing should establish atransducer position such as: |
| A. | I.D. and O.D. notches produce equal responses for equivalent metal path distances |
| B. | Rayleigh waves are generated through the entire pipe or tubing wall |
| C. | All ultrasound enters the test piece |
| D. | Only longitudinal waves are generated in the test piece |
| Answer» D. Only longitudinal waves are generated in the test piece | |
| 974. |
Lower 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» E. | |
| 975. |
A part is adaptable to magnetic particle inspection if |
| A. | It is attached to an electrostatic field |
| B. | The material is ferromagnetic |
| C. | The material is non-ferrous |
| D. | The material is an electric conductor |
| Answer» C. The material is non-ferrous | |
| 976. |
Typical ultrasonic testing frequencies are: |
| A. | 50 kHz to 1 MHz |
| B. | 200 kHz to 25 MHz |
| C. | 10 MHz to 100 MHz |
| D. | 1 MHz to 5 MHz |
| Answer» E. | |
| 977. |
Exposure of whole body to moderate radiation doses of 500 – 2000 mSv (50 to200 rem) would probably cause which of the following effects? |
| A. | Blood cell changes |
| B. | Swelling |
| C. | Possible nausea |
| D. | All of the above |
| Answer» E. | |
| 978. |
The strongest magnetic field in a coil is at the: |
| A. | Outside edge |
| B. | Inside edge |
| C. | Centre |
| D. | End |
| Answer» C. Centre | |
| 979. |
When a longitudinal wave is incident upon an inclined interface and is refracted atninety degrees, the angle of the incident longitudinal wave is called: |
| A. | The Snell constant |
| B. | The Snell angle |
| C. | The mode conversion constant |
| D. | The first critical angle |
| Answer» E. | |
| 980. |
What is the most common source of penetrant bath contamination? |
| A. | Emulsifier |
| B. | Water |
| C. | Developer |
| D. | Solvent |
| Answer» C. Developer | |
| 981. |
Which of the following methods might be used to reduce attenuation losses in anultrasonic test? |
| A. | Use a shorter wavelength |
| B. | Use a lower frequency transducer |
| C. | Change from longitudinal waves to shear waves |
| D. | Change to a coarser grained test piece |
| Answer» C. Change from longitudinal waves to shear waves | |
| 982. |
AA screen pattern containing a large number of low-level indications (often reffered toas ‘hash’) could be caused by: |
| A. | A crack |
| B. | A large inclusion |
| C. | Coarse grained material |
| D. | Fine grained material |
| Answer» D. Fine grained material | |
| 983. |
Which of the following is an advantage of a dry developer? |
| A. | Ease of handling |
| B. | Non-corrosive |
| C. | No hazardous vapours |
| D. | All of the above |
| Answer» E. | |
| 984. |
‘Photoelectric effect’ refers to: |
| A. | An electric camera |
| B. | Complete absorption of a photon |
| C. | The visible electromagnetic spectrum |
| D. | Scatter of neutrons |
| Answer» C. The visible electromagnetic spectrum | |
| 985. |
The first critical angle is defined as the longitudinal wave incident angle which resultsin: |
| A. | A refracted longitudinal wave of ninety degrees |
| B. | A refracted shear wave of ninety degrees |
| C. | Complete reflection of the shear wave |
| D. | None of the above |
| Answer» B. A refracted shear wave of ninety degrees | |
| 986. |
Fields generated in ferromagnetic material with AC current are useful for locating: |
| A. | All discontinuities |
| B. | Surface cracks |
| C. | Subsurface discontinuities |
| D. | Internal porosity |
| Answer» C. Subsurface discontinuities | |
| 987. |
The process of loading more than one film into a cassette is known as thetechnique: |
| A. | Single film technique |
| B. | Multiple film technique |
| C. | none |
| D. | none |
| Answer» C. none | |
| 988. |
A radiation producing device which emits radiation of one or a few discreetwavelengths is: |
| A. | An X ray machine |
| B. | A linear accelerator |
| C. | A gamma ray source |
| D. | A betatron |
| Answer» D. A betatron | |
| 989. |
The output of a mercury vapour black light depends on: |
| A. | Cleanliness of its filter |
| B. | Age of the bulb |
| C. | Both a and b |
| D. | None of the above |
| Answer» D. None of the above | |
| 990. |
A photon-nuclear interaction in which energy is converted into sub-atomic particles iscalled: |
| A. | The photoelectric effect |
| B. | The Compton effect |
| C. | Pair production |
| D. | Bremsstrahlung |
| Answer» D. Bremsstrahlung | |
| 991. |
The velocity of lamb waves depends on: |
| A. | Elastic constants of test material |
| B. | Plate thickness |
| C. | Frequency |
| D. | All of the above |
| Answer» E. | |
| 992. |
The maximum frequency usually used for contact testing is: |
| A. | 1 MHz |
| B. | 5 MHz |
| C. | 10 MHz |
| D. | 25 MHz |
| Answer» C. 10 MHz | |
| 993. |
What is the danger associated with using a wire brush during pre-cleaning? |
| A. | Bristles from the wire brush may cause false indications |
| B. | Contaminants from the wire brush may cause delayed hydrogen cracking of high carbon steels |
| C. | The wire brush may not adequately remove organic soils |
| D. | The wire brush may close or smear metal over |
| Answer» E. | |
| 994. |
Water based wet developer is applied: |
| A. | Immediately before removal of excess penetrant |
| B. | Immediately after removal of excess penetrant |
| C. | After a drying period following removal of excess penetrant |
| D. | For maximum sensitivity results |
| Answer» C. After a drying period following removal of excess penetrant | |
| 995. |
X cut crystals produce: |
| A. | Longitudinal waves |
| B. | Shear waves |
| C. | Lamb waves |
| D. | Surface waves |
| Answer» B. Shear waves | |
| 996. |
The lights in a high intensity viewer are typically: |
| A. | Fluorescent |
| B. | Normal incandescent bulbs |
| C. | Photoflood bulbs |
| D. | Mercury vapour lamps |
| Answer» D. Mercury vapour lamps | |
| 997. |
Which of the following is a function of lead screens? |
| A. | To reduce geometric unsharpness |
| B. | To increase scatter |
| C. | To reduce exposure time |
| D. | All of the above |
| Answer» D. All of the above | |
| 998. |
Which penetrant process is best suited to detect shallow discontinuities? |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post emulsifiable |
| D. | Fluorescent |
| Answer» D. Fluorescent | |
| 999. |
Shear waves for ultrasonic testing are usually produced: |
| A. | X cut crystals |
| B. | Y cut crystals |
| C. | Modulated R-F conversion |
| D. | Mode converted longitudinal waves |
| Answer» C. Modulated R-F conversion | |
| 1000. |
The tendency of a liquid to be drawn into small discontinuities is called: |
| A. | Viscosity |
| B. | Barometric |
| C. | Capillary action |
| D. | Surface tension |
| Answer» D. Surface tension | |