1267 + Mcqs in Testing Page 15 McqOptions

701.	Approximately what energy X ray machine would be required to have penetratingpower equivalent to a Cobalt-60 source:
A.	600 keV
B.	1.2 MeV
C.	2 MeV
D.	None of the above
Answer» C. 2 MeV

Discussion

702.	A disadvantage of the post emulsifiable penetrant process is that:
A.	Test pieces can be re-processed several times with little loss of sensitivity
B.	It is not very sensitive to open, shallow discontinuities
C.	It is less sensitive to degradation in the presence of acids and chromates
D.	Emulsifier application is an extra processing step
Answer» E.

Discussion

703.	The value of permeability is:
A.	A fixed value depending upon the type of material
B.	Between 1 and 100 for all ferromagnetic materials
C.	Between 0 and 10 for all ferromagnetic materials
D.	Dependent upon the amount of magnetizing force necessary to overcome
Answer» B. Between 1 and 100 for all ferromagnetic materials

Discussion

704.	According to ASTM E709-95 powder shall be applied upon the part to be tested insuch a manner that:
A.	A light uniform coating is formed
B.	In excess coating
C.	All of the above
D.	None of the above
Answer» B. In excess coating

Discussion

705.	The chief advantage of using a water washable penetrant process is:
A.	Sensitivity
B.	Safety
C.	Water tolerance
D.	Economics
Answer» C. Water tolerance

Discussion

706.	Which of the following product forms would probably be tested at the lowestfrequency?
A.	Forgings
B.	Hot rolled plate
C.	Castings
D.	Extrusions
Answer» D. Extrusions

Discussion

707.	A weld discontinuity which consists of unmelted joint surfaces at the root, and whichmay be caused by poor fit-up, is called:
A.	Hot short cracking
B.	A slag inclusion
C.	Incomplete penetration
D.	Burn through
Answer» D. Burn through

Discussion

708.	A radiation producing device which emits a broad spectrum of wavelengths is:
A.	A gamma ray source
B.	An X ray machine
C.	A Geiger Mueller tube
D.	A curie tube
Answer» C. A Geiger Mueller tube

Discussion

709.	When preparing a bath it is important to have the bath strength at a proper level, as too many particles can result in:
A.	Lowering the test amperage
B.	Having to increase the magnetising current
C.	Masking the indications
D.	None of the above
Answer» D. None of the above

Discussion

710.	Why might steel parts have a greater tendency towards rusting after penetrant testing?
A.	Penetrant materials are normally corrosive
B.	Penetrant materials residues are hydroscopic
C.	Any protective oils are removed during penetrant testing
D.	This is true only if the developer and penetrant residues are not removed after testing
Answer» D. This is true only if the developer and penetrant residues are not removed after testing

Discussion

711.	Which of the following methods are used to produce ultrasonic waves?
A.	Magnetostrictive methods
B.	Magnetoinductive methods
C.	Piezoelectric elements
D.	All of the above
Answer» E.

Discussion

712.	After the step wedge radiographs have been made, the of the image ofeach step is recorded on chart:
A.	Sharpness
B.	Contrast
C.	Density
D.	Length
Answer» D. Length

Discussion

713.	What is the likely result of incomplete removal of all excess penetrant from the testpiece surface?
A.	Formation of false indications
B.	Formation of relevant indications
C.	Exaggeration of the size of relevant indications
D.	None of the above
Answer» B. Formation of relevant indications

Discussion

714.	During the water rinse step of the water washable penetrant process, what is thedesired angle of the spray to the surface?
A.	Normal
B.	30 degrees
C.	45 degrees
D.	75 degrees
Answer» D. 75 degrees

Discussion

715.	The process of comparing an instrument or device with a standard is called:
A.	Angulation
B.	Calibration
C.	Attenuation
D.	Correlation
Answer» C. Attenuation

Discussion

716.	An advantage of a larger grain film is:
A.	It has higher speed
B.	It has better definition
C.	It has lower speed
D.	None of the above
Answer» B. It has better definition

Discussion

717.	In immersion testing, the position of the search unit is often varied to transmit soundinto the test part at various angles to the front surface. Such a procedure is referred to as:
A.	Angulation
B.	Dispersion
C.	Reflection testing
D.	Refraction
Answer» B. Dispersion

Discussion

718.	The area of maximum induced field strength using a yoke is:
A.	At the north pole of the yoke
B.	At the south pole of the yoke
C.	The area directly between the poles
D.	On the outside of the pole pieces
Answer» D. On the outside of the pole pieces

Discussion

719.	During a visible, solvent removable penetrant test, complete penetrant removal isindicated by:
A.	Absence of red indications on the test piece surface
B.	Clean rinse water
C.	Completion of the rinse cycle
D.	Absence of red dye on the cleaning towels
Answer» E.

Discussion

720.	Magnetic flux density is zero at:
A.	The inside surface of a tube magnetised with a central conductor
B.	The outside surface of a tube magnetised with a central conductor
C.	The outside surface of a bar magnetised with a head shot
D.	The centre of a bar magnetised with a head shot
Answer» E.

Discussion

721.	The half-life of Ir-192 is approximately:
A.	74 days
B.	129 days
C.	5.3 years
D.	30.1 years
Answer» B. 129 days

Discussion

722.	The proper number of ampere-turns for a given test specimen is determined by:
A.	Its length
B.	The material and its diameter
C.	Both the length and the material
D.	Its diameter and length
Answer» E.

Discussion

723.	A disadvantage of using natural quartz crystals in a search unit is that:
A.	It will dissolve in water
B.	It is the least effective generator of ultrasonic energy of all commonly used materials
C.	It easily loses it operating characteristics as it ages
D.	None of the above is correct
Answer» C. It easily loses it operating characteristics as it ages

Discussion

724.	An acceptable quality radiograph should include:
A.	Proper identification
B.	Correct penetrameter and visible holes
C.	Location markers
D.	All of the above
Answer» E.

Discussion

725.	Among the following, the best type of current for the detection of fatigue cracks is:
A.	Half-wave direct current
B.	Alternating current
C.	Direct current
D.	Half-wave alternating current
Answer» C. Direct current

Discussion

726.	Post cleaning is especially important when:
A.	Post emulsified penetrants are used
B.	Phosphate containing detergents are used
C.	Chlorinated hydrocarbons are used
D.	The test object will be used in a liquid oxygen environment
Answer» E.

Discussion

727.	The best available source of black light for inspection is:
A.	The mercury vapour lamp
B.	The fluorescent tube
C.	The incandescent bulb
D.	Sunlight
Answer» B. The fluorescent tube

Discussion

728.	Waves whose particle displacement is parallel to the direction of propagation arecalled:
A.	Longitudinal waves
B.	Shear waves
C.	Lamb waves
D.	Rayleigh waves
Answer» B. Shear waves

Discussion

729.	Demagnetisation:
A.	May be easy or difficult depending on the type of material
B.	Is easy for materials having a high coercive force
C.	Is always most difficult in materials retaining a high residual field
D.	All of the above answers are correct
Answer» B. Is easy for materials having a high coercive force

Discussion

730.	‘Undercut’ or ‘burned out’ edges of the test piece in film image can usually be reduced by:
A.	Increasing source to film distance
B.	Decreasing the thickness of the lead screens
C.	Placing a thin sheet of lead behind the cassette
D.	Masking the test piece
Answer» E.

Discussion

731.	A term which refers to the sharpness of the radiographic image is:
A.	Sensitivity
B.	Halo effect
C.	Shadow effect
D.	Definition
Answer» E.

Discussion

732.	An advantage of using a transducer with a large beam spread is:
A.	Higher sensitivity to small discontinuities
B.	Less likelihood of spurious echoes
C.	Greater likelihood of spurious echoes
D.	Greater likelihood of detecting randomly oriented discontinuities
Answer» E.

Discussion

733.	A 25 MHz search unit would most likely be used during:
A.	Straight beam contact testing
B.	Immersion testing
C.	Angle beam contact testing
D.	Surface wave contact testing
Answer» C. Angle beam contact testing

Discussion

734.	In performing a water content test of a lipophilic emulsifier per ASTM D-95, whatsolvent is used?
A.	Naptha
B.	Trichloroethane
C.	Benzene
D.	Xylene
Answer» E.

Discussion

735.	Which of the following types of intensifying screens are not used in industrialradiography?
A.	Lead
B.	Fluorescent
C.	Silver halide
D.	All of the above
Answer» D. All of the above

Discussion

736.	A good Cobalt-60 shot is made on a 7.6 cm (3 inches) steel casting using an exposure time of 10 minutes and a source-to-film distance of 91.5 (36 inches). If it is necessary to change the source-to-film distance to 61 cm (24 inches), what exposure time would produce a similar radiograph if all other conditions remain the same?
A.	1.6 minutes
B.	4.4 minutes
C.	6.4 minutes
D.	8.8 minutes
Answer» C. 6.4 minutes

Discussion

737.	Subjecting the part to a magnetic field that is constantly reversing in polarity andgradually diminishing in strength accomplishes which of the following:
A.	Magnetises the part
B.	Removes residual field from the part
C.	Soaks in the flux density
D.	Helps find deep lying defects
Answer» C. Soaks in the flux density

Discussion

738.	The coated inside surface of the large end of a cathode ray tube which becomesluminous when struck by an electron beam is called:
A.	An electron gun
B.	An electron amplifier
C.	A CRT screen
D.	An electron counter
Answer» D. An electron counter

Discussion

739.	Betatrons are 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

Discussion

740.	According to ASTM E709-95 and API, when fluorescent particles are used, the UVbulb shall warm up prior to use for at least:
A.	1 minute
B.	2 minutes
C.	3 minutes
D.	5 minutes
Answer» E.

Discussion

741.	The only sound waves which travel in liquids are:
A.	Longitudinal waves
B.	Shear waves
C.	Rayleigh waves
D.	Plate waves
Answer» B. Shear waves

Discussion

742.	Piezoelectric ability is the property of a material to:
A.	Become electrically conductive when heated above its critical temperature
B.	Generate sound when heated above its critical temperature
C.	Vibrate at high frequency when subjected to a temperature gradient
D.	Produce an electric current when deformed and vice versa
Answer» E.

Discussion

743.	The difference in densities seen on a radiograph due to section changes in an item is:
A.	Film contrast
B.	Radiographic contrast
C.	Subject contrast
D.	Radiographic sensitivity
Answer» D. Radiographic sensitivity

Discussion

744.	Film intensifying screens are normally used to:
A.	Decrease exposure time
B.	Increase grain size
C.	Shield film from stray light
D.	All of the above
Answer» B. Increase grain size

Discussion

745.	Which of the following circuits converts electrical energy to ultrasonic energy?
A.	The pulse generator
B.	The transducer
C.	The transformer
D.	The power supply
Answer» C. The transformer

Discussion

746.	The act of determining the effect of a discontinuity of the usefulness of a part is called:
A.	Interpretation
B.	Inspection
C.	Evaluation
D.	Determination
Answer» D. Determination

Discussion

747.	A leakage field is strongest when a discontinuity interrupts the magnetic flux lines atan angle of:
A.	Zero degrees
B.	45 degrees
C.	90 degrees
D.	180 degrees
Answer» D. 180 degrees

Discussion

748.	The 50 mm diameter hole in an IIW block is used to:
A.	Determine the beam index point
B.	Check resolution
C.	Calibrate angle beam distance
D.	Check beam angle
Answer» E.

Discussion

749.	Which of the following is a disadvantage of immersion test units?
A.	Inspection speed
B.	Ease of controlling sound beam direction
C.	Portability
D.	Application to automatic scanning techniques
Answer» D. Application to automatic scanning techniques

Discussion

750.	Which of the following describes the sound field propagating in a piece of steel bar stock which is being tested from one end with longitudinal waves?
A.	Non uniform, containing maxima and minima because of the focusing effect of laterally reflected waves
B.	Increasing to a peak, then decreasing throughout the far field
C.	Uniformly decreasing along the length of the bar
D.	Decreasing according to the inverse square law
Answer» E.

Discussion

Explore topic-wise MCQs in Embedded Systems.

Approximately what energy X ray machine would be required to have penetratingpower equivalent to a Cobalt-60 source:

A disadvantage of the post emulsifiable penetrant process is that:

The value of permeability is:

According to ASTM E709-95 powder shall be applied upon the part to be tested insuch a manner that:

The chief advantage of using a water washable penetrant process is:

Which of the following product forms would probably be tested at the lowestfrequency?

A weld discontinuity which consists of unmelted joint surfaces at the root, and whichmay be caused by poor fit-up, is called:

A radiation producing device which emits a broad spectrum of wavelengths is:

When preparing a bath it is important to have the bath strength at a proper level, as too many particles can result in:

Why might steel parts have a greater tendency towards rusting after penetrant testing?

Which of the following methods are used to produce ultrasonic waves?

After the step wedge radiographs have been made, the of the image ofeach step is recorded on chart:

What is the likely result of incomplete removal of all excess penetrant from the testpiece surface?

During the water rinse step of the water washable penetrant process, what is thedesired angle of the spray to the surface?

The process of comparing an instrument or device with a standard is called:

An advantage of a larger grain film is:

In immersion testing, the position of the search unit is often varied to transmit soundinto the test part at various angles to the front surface. Such a procedure is referred to as:

The area of maximum induced field strength using a yoke is:

During a visible, solvent removable penetrant test, complete penetrant removal isindicated by:

Magnetic flux density is zero at:

The half-life of Ir-192 is approximately:

The proper number of ampere-turns for a given test specimen is determined by:

A disadvantage of using natural quartz crystals in a search unit is that:

An acceptable quality radiograph should include:

Among the following, the best type of current for the detection of fatigue cracks is:

Post cleaning is especially important when:

The best available source of black light for inspection is:

Waves whose particle displacement is parallel to the direction of propagation arecalled:

Demagnetisation:

‘Undercut’ or ‘burned out’ edges of the test piece in film image can usually be reduced by:

A term which refers to the sharpness of the radiographic image is:

An advantage of using a transducer with a large beam spread is:

A 25 MHz search unit would most likely be used during:

In performing a water content test of a lipophilic emulsifier per ASTM D-95, whatsolvent is used?

Which of the following types of intensifying screens are not used in industrialradiography?

Subjecting the part to a magnetic field that is constantly reversing in polarity andgradually diminishing in strength accomplishes which of the following:

The coated inside surface of the large end of a cathode ray tube which becomesluminous when struck by an electron beam is called:

Betatrons are used to produce X rays in what range?

According to ASTM E709-95 and API, when fluorescent particles are used, the UVbulb shall warm up prior to use for at least:

The only sound waves which travel in liquids are:

Piezoelectric ability is the property of a material to:

The difference in densities seen on a radiograph due to section changes in an item is:

Film intensifying screens are normally used to:

Which of the following circuits converts electrical energy to ultrasonic energy?

The act of determining the effect of a discontinuity of the usefulness of a part is called:

A leakage field is strongest when a discontinuity interrupts the magnetic flux lines atan angle of:

The 50 mm diameter hole in an IIW block is used to:

Which of the following is a disadvantage of immersion test units?

Which of the following describes the sound field propagating in a piece of steel bar stock which is being tested from one end with longitudinal waves?