335 + Mcqs in Non Destructive Testing and Evaluation Page 5 McqOptions

201.	In which zone does the amplitude of an indication from a given discontinuity diminish exponentially as the distance increases?
A.	Far field zone
B.	Near field zone
C.	Dead zone
D.	Fresnel zone
Answer» B. Near field zone

Discussion

202.	A reaction which occurs when a radiation beam of 50 keV is partially absorbed by a test piece would probably be:
A.	The Compton effect
B.	The photoelectric effect
C.	Pair production
D.	Any of the above
Answer» C. Pair production

Discussion

203.	Strong signals which travel across the horizontal time base of an A scan presentation while the transducer is motionless on the test piece are probably:
A.	Randomly oriented flaws
B.	Electrical interference
C.	Grain noise
D.	Loose wedge on transducer
Answer» C. Grain noise

Discussion

204.	A reaction which occurs when a radiation beam of 15 MeV is partially absorbed by a test piece would probably be:
A.	The Compton effect
B.	The photoelectric effect
C.	Pair production
D.	Any of the above
Answer» D. Any of the above

Discussion

205.	What is the most important factor in determining the archival quality of radiographic film?
A.	Film density
B.	Image quality
C.	Degree of removal of fixer residues during washing
D.	Degree of removal of developer residues during washing
Answer» D. Degree of removal of developer residues during washing

Discussion

206.	Which of the following would be likely to cause variations in the output of an inspection black light?
A.	Voltage fluctuations
B.	Aged bulb
C.	Dirty filter
D.	All of the above
Answer» E.

Discussion

207.	When variations are noticed in the front surface reflection, the test piece should be inspected 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

Discussion

208.	A reaction which occurs when a radiation beam of 90 keV is totally absorbed by a test piece would probably be:
A.	The Compton effect
B.	The photoelectric effect
C.	Pair production
D.	Any of the above
Answer» C. Pair production

Discussion

209.	Laminations would most likely be encountered in which of the following product forms?
A.	Forgings
B.	Hot rolled plate
C.	Castings
D.	Welds
Answer» C. Castings

Discussion

210.	Approximately what energy X ray machine would be required to have penetrating power 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

211.	Which of the following materials would probably require testing at the lowest frequency?
A.	Small grained mild steel
B.	Mild steel castings
C.	Mild steel forgings
D.	Cast iron
Answer» E.

Discussion

212.	Exposure of whole body to moderate radiation doses of 500 2000 mSv (50 to 200 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.

Discussion

213.	A reaction which occurs when a radiation beam of 500 keV is partially absorbed by a test 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

Discussion

214.	Acoustic energy propagates in different modes. Which of the following represent a mode?
A.	Longitudinal wave
B.	Shear wave
C.	Surface wave
D.	All of the above
Answer» E.

Discussion

215.	The number of complete waves which pass a given point in a given period of time (usually one second) is referred to as the:
A.	Amplitude of a wave motion
B.	Pulse length of a wave motion
C.	Frequency of a wave motion
D.	Wavelength of a wave motion
Answer» D. Wavelength of a wave motion

Discussion

216.	The point at which the magnetism in a material cannot be increased even though the magnetising force continues to increase is known as the:
A.	Salient pole
B.	Saturation point
C.	Residual point
D.	Remnant point
Answer» C. Residual point

Discussion

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

Discussion

218.	Addition of approximately 6% antimony as an alloying element could be expected to increase the ultrasonic inspectability of which of the following materials?
A.	Low carbon steel
B.	Stainless steel
C.	Iron
D.	Pure lead
Answer» E.

Discussion

219.	What type of penetrant process would be best suited to an application at near freezing temperatures?
A.	Solvent removable
B.	Water washable
C.	Post emulsifiable
D.	None of the above
Answer» E.

Discussion

220.	Entry surface resolution is a characteristic of an ultrasonic testing system which defines its ability to:
A.	Detect discontinuities oriented in a direction parallel to the ultrasonic beam
B.	Detect discontinuities located in the center of a forging containing a fine metallurgical structure
C.	Detect minute surface scratches
D.	Detect discontinuities located just beneath the entry surface in the part being tested
Answer» E.

Discussion

221.	Approximately how long would it take for a 370 GBq (10 Ci) Co-60 source to decay to 92.5 GBq (2.5 Ci)?
A.	5.3 days
B.	5.3 years
C.	10.6 days
D.	10.6 years
Answer» E.

Discussion

222.	If 37 GBq (1 Ci), of Ir-92 produces dose rate of 0.59 Gy/h (59000 mR/h) at 30.5 cm (1 foot), how much dose in Gy/h (R/h) will 370 GBq (10 Ci) produce at the same distance?
A.	0.59 Gy/h (59000R/h)
B.	0.0059 Gy/h (590 R/h)
C.	5.9 Gy/h (590,000 R/h)
D.	0.00059 Gy/h (59 R/h)
Answer» D. 0.00059 Gy/h (59 R/h)

Discussion

223.	In steel, the velocity of sound is greatest in which of the following modes of vibration?
A.	Longitudinal
B.	Shear
C.	Surface wave
D.	Sound velocity is identical in all modes, in a given material
Answer» B. Shear

Discussion

224.	The primary form of energy conversion when an X ray tube is energized results in the production of:
A.	Primary X rays
B.	Secondary X ray
C.	Short wavelength X ray
D.	Heat
Answer» D. Heat

Discussion

225.	Two X ray machines operating at same nominal kilovoltage and milliamperage settings:
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.

Discussion

226.	An ultrasonic technique in which two transducers are used, in a constant position relative to each other, is:
A.	Through transmission
B.	Contact testing
C.	Pulse echo
D.	Continuous wave
Answer» B. Contact testing

Discussion

227.	Which of the following cast materials could most likely be successfully ultrasonically tested?
A.	Low carbon steel
B.	Stainless steel
C.	Iron
D.	Pure lead
Answer» B. Stainless steel

Discussion

228.	A technique in which two transducers are used, one on each side of the test piece, is called:
A.	Angle beam testing
B.	Modified immersion testing
C.	Through transmission testing
D.	Twinning
Answer» D. Twinning

Discussion

229.	Which of the following transducer materials is the most efficient receiver of ultrasonic energy?
A.	Lead metaniobate
B.	Quartz
C.	Lithium sulfate
D.	Barium titanate
Answer» D. Barium titanate

Discussion

230.	The primary effect of an increase in the milliamperage at which a X ray tube is being operated would be to:
A.	Increase the radiation intensity
B.	Increase penetrating power
C.	Increase primary beam wavelengths
D.	All of the above
Answer» B. Increase penetrating power

Discussion

231.	The primary effect of an increase in the kilovoltage at which a X ray tube is being operated would be to:
A.	Increase the radiation intensity
B.	Increase penetrating power
C.	Increase penetrating power and radiation intensity
D.	Increase primary beam wavelength
Answer» C. Increase penetrating power and radiation intensity

Discussion

232.	When the motion of the particles of a medium is transverse to the direction of propagation, the wave being transmitted is called a:
A.	Longitudinal wave
B.	Shear wave
C.	Surface wave
D.	Lamb wave
Answer» C. Surface wave

Discussion

233.	The boundary between two different materials which are in contact with each other is called:
A.	A rarefactor
B.	A refractor
C.	An interface
D.	A marker
Answer» D. A marker

Discussion

234.	Which of the following materials of the same alloy is most likely to produce the greatest amount of sound attenuation over a given distance?
A.	A hand forging
B.	A coarse grained casting
C.	An extrusion
D.	The attenuation is equal in all materials
Answer» C. An extrusion

Discussion

235.	The velocity of surface waves is approximately shear waves in the same material.
A.	Two times
B.	Four times
C.	One half
D.	Nine-tenths
Answer» E.

Discussion

236.	When the motion of the particles of a medium is parallel to the direction of propagation, the wave being transmitted is called a:
A.	Longitudinal wave
B.	Shear wave
C.	Surface wave
D.	Lamb wave
Answer» B. Shear wave

Discussion

237.	One of the most common applications of ultrasonic tests employing shear waves is the:
A.	Detection of discontinuities in welds, tube and pipe
B.	Determination of elastic properties of metallic products
C.	Detection of laminar discontinuities in heavy plate
D.	Measurement of thickness of thin plate
Answer» B. Determination of elastic properties of metallic products

Discussion

238.	Sound waves which travel on the surface of a solid in a manner similar to waves on a water surface are called:
A.	Rayleigh waves
B.	Shear waves
C.	Primary waves
D.	Compression waves
Answer» B. Shear waves

Discussion

239.	Which of the following types of radiation is commonly used in radiographic testing? (Choose one):
A.	Alpha particles
B.	Neutrons
C.	gamma rays
D.	Beta rays
Answer» D. Beta rays

Discussion

240.	When comparing discontinuity echoes to equivalent flat bottom hole echoes in materials with similar impedance, surface finish and attenuation:
A.	The flaw is never larger than the flat bottom hole
B.	The flaw is never smaller than the flat bottom hole
C.	The flaw is always smaller than the flat bottom hole
D.	None of the above
Answer» E.

Discussion

241.	The longitudinal wave incident angle which results in formation of a rayleigh wave is called:
A.	Normal incidence
B.	The first critical angle
C.	The second critical angle
D.	Any angle above the first critical angle
Answer» D. Any angle above the first critical angle

Discussion

242.	The cable that connects the ultrasonic instrument to the search unit is specially designed so that one conductor is centred inside another. The technical name for such a cable is:
A.	BX cable
B.	Conduit
C.	Coaxial cable
D.	Ultrasonic conductor cable grade 20
Answer» D. Ultrasonic conductor cable grade 20

Discussion

243.	The second critical angle is defined as the longitudinal wave incident angle which results in:
A.	A refracted longitudinal wave of ninety degrees
B.	A refracted shear wave of ninety degrees
C.	Complete reflection of the sound beam
D.	None of the above
Answer» C. Complete reflection of the sound beam

Discussion

244.	The echo on the cathode ray tube (CRT) which represents the far boundary of the material being tested is called:
A.	Hash
B.	The initial pulse
C.	The main bang
D.	The back wall echo
Answer» E.

Discussion

245.	How many decibels of attenuation correspond to an ultrasonic signal loss of from 100% to 25% on full screen height?
A.	6
B.	10
C.	12
D.	14
Answer» D. 14

Discussion

246.	Typical frequencies which might be used to perform ultrasonic testing of concrete are:
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

Discussion

247.	An indication which is formed when two pieces of magnetised steel come in contact with each other is called:
A.	A metallurgical discontinuity
B.	Magnetic writing
C.	Magnetic transfer
D.	A ferromagnetic notch
Answer» C. Magnetic transfer

Discussion

248.	When a longitudinal wave sound beam passes through an acoustic interface at some angle other than zero degrees:
A.	Surface waves are generated
B.	Plate waves are generated
C.	Reflection, refraction and mode conversion will occur
D.	The first critical angle is reached
Answer» D. The first critical angle is reached

Discussion

249.	An ultrasonic wave in which particle displacement is 90 degrees to the direction of wave propagation is called a:
A.	Longitudinal wave
B.	Shear wave
C.	Compressional wave
D.	Plate wave
Answer» C. Compressional wave

Discussion

250.	Typical frequencies which might be used to perform ultrasonic testing of ferrous and non-ferrous welds are:
A.	25 to 100 kHz
B.	200 to 5 MHz
C.	1 MHz to 5 MHz
D.	2.25 MHz to 10 MHz
Answer» D. 2.25 MHz to 10 MHz

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

In which zone does the amplitude of an indication from a given discontinuity diminish exponentially as the distance increases?

A reaction which occurs when a radiation beam of 50 keV is partially absorbed by a test piece would probably be:

Strong signals which travel across the horizontal time base of an A scan presentation while the transducer is motionless on the test piece are probably:

A reaction which occurs when a radiation beam of 15 MeV is partially absorbed by a test piece would probably be:

What is the most important factor in determining the archival quality of radiographic film?

Which of the following would be likely to cause variations in the output of an inspection black light?

When variations are noticed in the front surface reflection, the test piece should be inspected for possible near surface discontinuities by:

A reaction which occurs when a radiation beam of 90 keV is totally absorbed by a test piece would probably be:

Laminations would most likely be encountered in which of the following product forms?

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

Which of the following materials would probably require testing at the lowest frequency?

Exposure of whole body to moderate radiation doses of 500 2000 mSv (50 to 200 rem) would probably cause which of the following effects?

A reaction which occurs when a radiation beam of 500 keV is partially absorbed by a test piece would probably be:

Acoustic energy propagates in different modes. Which of the following represent a mode?

The number of complete waves which pass a given point in a given period of time (usually one second) is referred to as the:

The point at which the magnetism in a material cannot be increased even though the magnetising force continues to increase is known as the:

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

Addition of approximately 6% antimony as an alloying element could be expected to increase the ultrasonic inspectability of which of the following materials?

What type of penetrant process would be best suited to an application at near freezing temperatures?

Entry surface resolution is a characteristic of an ultrasonic testing system which defines its ability to:

Approximately how long would it take for a 370 GBq (10 Ci) Co-60 source to decay to 92.5 GBq (2.5 Ci)?

If 37 GBq (1 Ci), of Ir-92 produces dose rate of 0.59 Gy/h (59000 mR/h) at 30.5 cm (1 foot), how much dose in Gy/h (R/h) will 370 GBq (10 Ci) produce at the same distance?

In steel, the velocity of sound is greatest in which of the following modes of vibration?

The primary form of energy conversion when an X ray tube is energized results in the production of:

Two X ray machines operating at same nominal kilovoltage and milliamperage settings:

An ultrasonic technique in which two transducers are used, in a constant position relative to each other, is:

Which of the following cast materials could most likely be successfully ultrasonically tested?

A technique in which two transducers are used, one on each side of the test piece, is called:

Which of the following transducer materials is the most efficient receiver of ultrasonic energy?

The primary effect of an increase in the milliamperage at which a X ray tube is being operated would be to:

The primary effect of an increase in the kilovoltage at which a X ray tube is being operated would be to:

When the motion of the particles of a medium is transverse to the direction of propagation, the wave being transmitted is called a:

The boundary between two different materials which are in contact with each other is called:

Which of the following materials of the same alloy is most likely to produce the greatest amount of sound attenuation over a given distance?

The velocity of surface waves is approximately shear waves in the same material.

When the motion of the particles of a medium is parallel to the direction of propagation, the wave being transmitted is called a:

One of the most common applications of ultrasonic tests employing shear waves is the:

Sound waves which travel on the surface of a solid in a manner similar to waves on a water surface are called:

Which of the following types of radiation is commonly used in radiographic testing? (Choose one):

When comparing discontinuity echoes to equivalent flat bottom hole echoes in materials with similar impedance, surface finish and attenuation:

The longitudinal wave incident angle which results in formation of a rayleigh wave is called:

The cable that connects the ultrasonic instrument to the search unit is specially designed so that one conductor is centred inside another. The technical name for such a cable is:

The second critical angle is defined as the longitudinal wave incident angle which results in:

The echo on the cathode ray tube (CRT) which represents the far boundary of the material being tested is called:

How many decibels of attenuation correspond to an ultrasonic signal loss of from 100% to 25% on full screen height?

Typical frequencies which might be used to perform ultrasonic testing of concrete are:

An indication which is formed when two pieces of magnetised steel come in contact with each other is called:

When a longitudinal wave sound beam passes through an acoustic interface at some angle other than zero degrees:

An ultrasonic wave in which particle displacement is 90 degrees to the direction of wave propagation is called a:

Typical frequencies which might be used to perform ultrasonic testing of ferrous and non-ferrous welds are: