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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.
| 651. |
The most useful range of incident longitudinal wave angles for ultrasonic testing is: |
| A. | Normal incidence to the first critical angle |
| B. | First critical angle to the second critical angle |
| C. | Second critical angle to the third critical angle |
| D. | Above the third critical angle |
| Answer» B. First critical angle to the second critical angle | |
| 652. |
Which of the following is the proper first step in removal of excess penetrant when using the solvent removable penetrant process? |
| A. | Immerse the test piece in solvent |
| B. | Spray the test piece with water |
| C. | Wipe the test piece surface with clean, lint free towels slightly moistened |
| D. | All of the above is correct |
| Answer» D. All of the above is correct | |
| 653. |
When radiographing a part which contains a crack, it will appear on the radiograph as: |
| A. | A dark continuous line |
| B. | A light, irregular line |
| C. | Either a dark or light line |
| D. | A dark linear indication which could be continuous or intermittent |
| Answer» E. | |
| 654. |
A filter will reduce the amount of in the primary radiation beam: |
| A. | Scatter |
| B. | Electrons |
| C. | High energy radiation |
| D. | Low energy radiation |
| Answer» E. | |
| 655. |
Pinhole radiography would be used to: |
| A. | Make high quality radiographs for critical inspection |
| B. | Determine focal spot size |
| C. | Construct exposure charts |
| D. | None of the above |
| Answer» C. Construct exposure charts | |
| 656. |
Most commercial ultrasonic testing is accomplished using frequencies between: |
| A. | 1 and 25 kHz |
| B. | 0.2 and 25 MHz |
| C. | 1 and 1 000 kHz |
| D. | 15 and 100 MHz |
| Answer» C. 1 and 1 000 kHz | |
| 657. |
The wet method is superior to dry particles for detecting: |
| A. | Subsurface discontinuities |
| B. | Fine surface cracks |
| C. | Open surface cracks |
| D. | None of the above |
| Answer» C. Open surface cracks | |
| 658. |
Application of penetrant to a test piece may be by: |
| A. | Dipping, brushing or spraying |
| B. | Spraying only |
| C. | Bushing or spraying only |
| D. | Dipping or spraying only |
| Answer» B. Spraying only | |
| 659. |
Calculate the refracted shear wave angle in aluminium [VS = 0.31cm/microsec] for anincident longitudinal wave of 43.5 degrees in Plexiglas [VL =0.267cm/microsec] |
| A. | 53 degrees |
| B. | 61 degrees |
| C. | 42 degrees |
| D. | 68 degrees |
| Answer» B. 61 degrees | |
| 660. |
An advantage of using lithium sulphate in search units it that: |
| A. | It is one of the most efficient generators of ultrasonic energy |
| B. | It is one of the most efficient receivers of ultrasonic energy |
| C. | It is insoluble |
| D. | It can withstand temperatures as high as 700ºC |
| Answer» C. It is insoluble | |
| 661. |
A reaction which occurs when a radiation beam of 500 keV is partially absorbed by atest piece would probably be: |
| A. | The Compton effect |
| B. | The photoelectric effect |
| C. | Pair production |
| D. | Any of the above |
| Answer» B. The photoelectric effect | |
| 662. |
What is the most desirable temperature for manual developer solutions? |
| A. | 15.5oC(60oF) |
| B. | 20oC (68oF) |
| C. | 22.2oC (72oF) |
| D. | 26.6oC (80oF) |
| Answer» C. 22.2oC (72oF) | |
| 663. |
How many turns of a coil will be needed to establish a longitudinal field in a steel shaft that is 22.86 cm (9 inches) long and 7.62 cm (3 inches) in diameter? 3000 amperes magnetizing current is available, it is desired to magnetize the part in accordance with the formula NI = 45,000/(L/D): |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» D. 7 | |
| 664. |
A photon-electron interaction in which a photon gives up a portion of its energy to anelectron is called: |
| A. | The photoelectric effect |
| B. | The Compton effect |
| C. | Pair production |
| D. | Bremsstrahlung |
| Answer» C. Pair production | |
| 665. |
The areas on a magnetised part from which the magnetic field is leaving or returninginto the part are called: |
| A. | Salient points |
| B. | Defects |
| C. | Magnetic poles |
| D. | Nodes |
| Answer» D. Nodes | |
| 666. |
Which of the following is a function of a developer |
| A. | Providing a contrasting background for visible dye indications |
| B. | Making the penetrant water washable |
| C. | Penetrating into discontinuities open to the surface |
| D. | Dissolve organic soils on the test piece surface |
| Answer» B. Making the penetrant water washable | |
| 667. |
The flux within and surrounding a magnetised part or around a conductor carrying acurrent is known as: |
| A. | Saturation point |
| B. | Magnetic field |
| C. | Ferromagnetic |
| D. | Paramagnetic |
| Answer» C. Ferromagnetic | |
| 668. |
Subject contrast and film contrast are the two factors that comprise radiographic: |
| A. | Definition |
| B. | Distortion |
| C. | Contrast |
| D. | Graininess |
| Answer» D. Graininess | |
| 669. |
A residual circular field may be objectionable because: |
| A. | Grinding may produce heat cracks |
| B. | Machining may create external poles |
| C. | Heat treating may lead to tight surface cracks\ |
| D. | All of the above |
| Answer» C. Heat treating may lead to tight surface cracks\ | |
| 670. |
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 |
| Answer» D. Retarded iris control | |
| 671. |
Radiography of tubular sections using a double wall, double viewing technique ismainly applicable to sections: |
| A. | Over 38 mm in diameter |
| B. | 88 mm in diameter or less |
| C. | 125 mm in diameter and less |
| D. | Under 25 mm in diameter |
| Answer» C. 125 mm in diameter and less | |
| 672. |
How many decibels of attenuation correspond to an ultrasonic signal loss of from100% to 25% on full screen height? |
| A. | 6 |
| B. | 10 |
| C. | 12 |
| D. | 14 |
| Answer» D. 14 | |
| 673. |
Which type of emulsifier is intended for use without dilution? |
| A. | Hydrophobic |
| B. | Hydrophilic |
| C. | Lipophilic |
| D. | Hygroscopic |
| Answer» D. Hygroscopic | |
| 674. |
The concentration of a hydrophilic emulsifier may be measured by: |
| A. | Specific gravity |
| B. | Fluorescent brightness |
| C. | An optical refraction meter |
| D. | A comparator block |
| Answer» D. A comparator block | |
| 675. |
Polished, flat surfaces are undesirable for ultrasonic testing consideration because: |
| A. | Coupling losses are greater |
| B. | Scan speeds tend to be too rapid |
| C. | Spurious lamb waves are prevalent |
| D. | The probe sticks to the surface because of suction |
| Answer» E. | |
| 676. |
Typical frequencies which might be used to perform ultrasonic testing of concreteare: |
| A. | 25 to 100 kHz |
| B. | 200 to 5 MHz |
| C. | 1 MHz to 5 MHz |
| D. | 2.25 MHz to 10 MHz |
| Answer» B. 200 to 5 MHz | |
| 677. |
As radiation (X ray or gamma ray) energy is lowered: |
| A. | Radiation of longer wavelength and better penetration is produced |
| B. | Radiation of shorter wavelength and better penetration is produced |
| C. | Radiation of shorter wavelength and less penetration is produced |
| D. | Radiation longer wavelength and less penetration is produced |
| Answer» E. | |
| 678. |
The total radiation dose received equals: |
| A. | The radiation intensity |
| B. | The source size in curies |
| C. | Radiation intensity times time of exposure |
| D. | Radiation intensity divided by the square of the distance from the source |
| Answer» D. Radiation intensity divided by the square of the distance from the source | |
| 679. |
What is the minimum age in years at which a person may perform radiography : |
| A. | 15 |
| B. | 18 |
| C. | 21 |
| D. | 30 |
| Answer» C. 21 | |
| 680. |
The speed at which X and gamma rays travel is: (choose one) |
| A. | The speed of light |
| B. | The speed of sound |
| C. | It varies with the wavelength |
| D. | Depends on the source |
| Answer» B. The speed of sound | |
| 681. |
The maximum film density to which the radiograph should be exposed is dependent upon: |
| A. | The quality of the film viewer |
| B. | The variation in thickness of the specimen |
| C. | The speed of the film |
| D. | The graininess of the film |
| Answer» B. The variation in thickness of the specimen | |
| 682. |
According to ASTM E709-95 before turning off current and examination, dry powderin excess shall be: |
| A. | Removed by a dry-air current |
| B. | Kept in place |
| C. | All of the above |
| D. | None of the above |
| Answer» E. | |
| 683. |
Which of the following would be classed as an in-service fault? |
| A. | A shrinkage crack |
| B. | A fatigue crack |
| C. | A grinding crack |
| D. | All could be in-service faults |
| Answer» C. A grinding crack | |
| 684. |
Penetrants may be applied to the surface of part by : |
| A. | Spraying |
| B. | Dipping |
| C. | Pouring |
| D. | All of the above methods are acceptable |
| Answer» C. Pouring | |
| 685. |
A casting flaw which is formed when two masses of molten metal flowing fromdifferent directions flow together, but fail to fuse, is called: |
| A. | A hot tear |
| B. | Shrinkage |
| C. | A cold crack |
| D. | A cold shut |
| Answer» E. | |
| 686. |
The temperature above which most soft steels become nonmagnetic is about: |
| A. | 440ºC(770oF) |
| B. | 523ºC (975ºF) |
| C. | 626ºC (1160ºF) |
| D. | 754ºC (1390ºF) |
| Answer» E. | |
| 687. |
Which of the following developers would you expect to be the least sensitive? |
| A. | Water suspendable wet (immersion) |
| B. | Water suspendable wet (spray) |
| C. | Dry immersion (dip) |
| D. | Non-aqueous wet (solvent spray) |
| Answer» D. Non-aqueous wet (solvent spray) | |
| 688. |
According to ASTM E709-95 and API, a linear indication is defined as an indicationin which the length is equal to or greater than the width by a factor of: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 689. |
The depth of penetration of surface waves is approximately: |
| A. | One wavelength |
| B. | Three wavelengths |
| C. | 1/2 wavelength |
| D. | The total part thickness |
| Answer» B. Three wavelengths | |
| 690. |
Which of the following is the most sensitive developer in descending order? |
| A. | Dry, water soluble, water suspendable |
| B. | Non-aqueous wet, water soluble, water suspendable ,dry |
| C. | Non-aqueous wet, dry, water soluble |
| D. | Water suspendable, water soluble, non-aqueous wet |
| Answer» C. Non-aqueous wet, dry, water soluble | |
| 691. |
Which of the following may cause magnetic particle test indications? |
| A. | A joint between two ferromagnetic materials of different permeability |
| B. | A shrink fit joint in ferromagnetic materials |
| C. | A brazed joint in ferromagnetic materials |
| D. | All of the above |
| Answer» E. | |
| 692. |
What is the preferred method of removing paint prior to performing a penetranttesting? |
| A. | Sand blast |
| B. | Chemical removers |
| C. | Power wire brush |
| D. | Shot blast |
| Answer» C. Power wire brush | |
| 693. |
Sound beam intensity is irregular in the area called: |
| A. | The near field |
| B. | The far field |
| C. | The beam spread |
| D. | The delay line |
| Answer» B. The far field | |
| 694. |
The fact that gases, when bombarded by radiation, ionise and become electricalconductors make them useful in: |
| A. | X ray transformers |
| B. | X ray tubes |
| C. | Masks |
| D. | Radiation detection equipment |
| Answer» E. | |
| 695. |
If we were to maintain the same exposure but decrease the source to film distance, we must the time of exposure: |
| A. | Increase |
| B. | Decrease |
| C. | none |
| D. | none |
| Answer» C. none | |
| 696. |
Spurious indications might be caused by which of the following? |
| A. | Mode conversion from beam spread in a long specimen |
| B. | Surface waves generated during straight beam testing |
| C. | A test piece with a smooth machined surface |
| D. | All of the above |
| Answer» B. Surface waves generated during straight beam testing | |
| 697. |
The basic purpose of a penetrameter is to: |
| A. | Indicate quality of the radiographic technique |
| B. | Indicate the smallest discontinuity which can be shown by the radiographic technique being used |
| C. | Serve as a comparison standard for evaluating discontinuity size |
| D. | All of the above |
| Answer» B. Indicate the smallest discontinuity which can be shown by the radiographic technique being used | |
| 698. |
Which of the following types of pre-cleaning processes may be used for liquidpenetrant testing? |
| A. | Wire brushing only |
| B. | Detergent and water only |
| C. | Vapour degreasing only |
| D. | Any process that leaves the part clean and dry, does not harm the part and is |
| Answer» E. | |
| 699. |
Two X ray machines operating at same nominal kilovoltage and milliamperagesettings: |
| A. | Will produce the same intensities and energies of radiation |
| B. | Will produce the same intensities but produce different energies of radiation |
| C. | Will produce the same energies but may produce different intensities of radiation |
| D. | May give not only different intensities, but also different energies of radiation |
| Answer» E. | |
| 700. |
Which of the following statements accurately describes the capabilities of liquidpenetrant testing? |
| A. | Liquid penetrant testing is useful for locating subsurface discontinuities in a test piece |
| B. | Liquid penetrant testing is useful for locating discontinuities in porous materials |
| C. | Liquid penetrant testing is useful for locating discontinuities which are open to the surface in non-porous materials |
| D. | none of the above |
| Answer» D. none of the above | |