The piezoelectric material in a search unit which vibrates to produce ultrasonic waves is called:

A transducer element or crystal

When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo?

Use a transducer with a narrower bandwidth

Use a lower frequency transducer

Use a transducer with a narrower bandwidth

Use a higher frequency transducer

Which of the following is the most effective method for the detection of extremely deep-lying defects:

Dry residual method using DC surge

Wet continuous method using half wave rectified current

Dry continuous method using half wave rectified current with prods

A smooth flat discontinuity whose major plane is not perpendicular to the direction of sound propagation may be indicated by:

An echo amplitude larger in magnitude than the back surface reflection

An echo amplitude comparable in magnitude to the back surface reflection

A complete loss of back surface reflection

An echo amplitude larger in magnitude than the back surface reflection

Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?

The focal spot should be as small as practicable

The focal spot to test piece distance should be as large as practicable

The film to test piece distance should be as small as practicable

The amount of beam divergence from a crystal is primarily dependent on the:

Tightness of crystal backing in the search unit

In the radiographic analysis procedure that is used to prepare an exposure chart, the first step is to:

Radiograph several objects of known thickness

Make a series of radiographs of a step wedge

Radiograph several objects of known thickness

Convert the densities read from the radiographs to a standard density

Other factors being equal, which of the following transducers would have the greatest beam spread?

None of the above has any effect

The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by:

The frequency of the transducer

In an A scan presentation, the amplitude of vertical indications on the screen represents the:

Distance travelled by the search unit

Amount of ultrasonic sound energy returning to the search unit

Distance travelled by the search unit

Thickness of material being tested

Elapsed time since the ultrasonic pulse was generated

335 + Mcqs in Non Destructive Testing and Evaluation in Mechanical Engineering Page 4 McqOptions

151.	AA test method employing two seperate search units on opposite surfaces of the material being tested is called:
A.	Contact testing
B.	Surface wave testing
C.	Through-transmission testing
D.	Lamb wave testing
Answer» D. Lamb wave testing

Discussion

152.	The piezoelectric material in a search unit which vibrates to produce ultrasonic waves is called:
A.	A backing material
B.	A lucite wedge
C.	A transducer element or crystal
D.	A couplant
Answer» D. A couplant

Discussion

153.	Calculate the refracted shear wave angle in steel [VS = 0.323cm/microsec] for an incident longitudinal wave of 37.9 degrees in Plexiglas [VL = 0.267cm/microsec]
A.	26 degrees
B.	45 degrees
C.	48 degrees
D.	64 degrees
Answer» C. 48 degrees

Discussion

154.	Calculate the refracted shear wave angle in steel [VS = 0.323cm/microsec] for an incident longitudinal wave of 45.7 degrees in Plexiglas [VL = 0.267cm/microsec]
A.	64 degrees
B.	45.7 degrees
C.	60 degrees
D.	70 degrees
Answer» D. 70 degrees

Discussion

155.	Calculate the refracted shear wave angle in aluminium [VS = 0.31cm/microsec] for an incident 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

Discussion

156.	Calculate the refracted shear wave angle in aluminium [VS = 0.31cm/microsec] for an incident longitudinal wave of 53 degrees in Plexiglas [VL = 0.267cm/microsec]
A.	53 degrees
B.	61 degrees
C.	42 degrees
D.	68 degrees
Answer» E.

Discussion

157.	The coated inside surface of the large end of a cathode ray tube which becomes luminous 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

158.	When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo?
A.	Use a wetter transducer
B.	Use a lower frequency transducer
C.	Use a transducer with a narrower bandwidth
D.	Use a higher frequency transducer
Answer» C. Use a transducer with a narrower bandwidth

Discussion

159.	Compared to the echo returned from a smooth reflector, the echo returned from a natural flaw of the same area and orientation is:
A.	The same
B.	Greater
C.	Smaller
D.	Not related to
Answer» D. Not related to

Discussion

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

Discussion

161.	Which of the following is the most effective method for the detection of extremely deep-lying defects:
A.	Dry residual method using DC surge
B.	Wet continuous method using half wave rectified current
C.	Wet residual method
D.	Dry continuous method using half wave rectified current with prods
Answer» E.

Discussion

162.	A smooth flat discontinuity whose major plane is not perpendicular to the direction of sound propagation may be indicated by:
A.	An echo amplitude comparable in magnitude to the back surface reflection
B.	A complete loss of back surface reflection
C.	An echo amplitude larger in magnitude than the back surface reflection
D.	All of the above
Answer» C. An echo amplitude larger in magnitude than the back surface reflection

Discussion

163.	AA term used in ultrasonics to express the rate at which sound waves pass through various substances is:
A.	Frequency
B.	Velocity
C.	Wave length
D.	Pulse length
Answer» C. Wave length

Discussion

164.	The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 cm or 1 foot) is attenuated in air to approximately 5mR/h at a distance of approximately:
A.	914.5 cm (30 feet)
B.	1524 cm (50 feet)
C.	3048 cm (100feet)
D.	6096 cm (200 feet)
Answer» C. 3048 cm (100feet)

Discussion

165.	AA display which shows the initial pulse and the front surface echo superimposed would be considered:
A.	An immersion test
B.	An A scan
C.	A contact test
D.	A B scan
Answer» C. A contact test

Discussion

166.	AA display which shows the initial pulse and the front surface echo with a fairly wide space between the two would be considered:
A.	An immersion test
B.	An A scan
C.	A contact test
D.	A B scan
Answer» B. An A scan

Discussion

167.	In a basic pulse-echo ultrasonic instrument, the component that produces the time base line is called a:
A.	Sweep circuit
B.	Receiver
C.	Pulser
D.	Synchroniser
Answer» B. Receiver

Discussion

168.	Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?
A.	The focal spot should be as small as practicable
B.	The focal spot to test piece distance should be as large as practicable
C.	The film to test piece distance should be as small as practicable
D.	All of the above
Answer» E.

Discussion

169.	The amount of beam divergence from a crystal is primarily dependent on the:
A.	Type of test
B.	Tightness of crystal backing in the search unit
C.	Frequency and crystal size
D.	Pulse length
Answer» D. Pulse length

Discussion

170.	The scattering of the rays of an ultrasonic beam due to reflection from a highly irregular surface is called:
A.	Angulation
B.	Dispersion
C.	Refraction
D.	Diffraction
Answer» E.

Discussion

171.	In the radiographic analysis procedure that is used to prepare an exposure chart, the first step is to:
A.	Make a series of radiographs of a step wedge
B.	Radiograph several objects of known thickness
C.	Convert the densities read from the radiographs to a standard density
D.	Plot the exposures on a graph
Answer» B. Radiograph several objects of known thickness

Discussion

172.	When a drain-dwell technique is used during emulsification, what two mechanisms are responsible for combining the emulsifier and penetrant?
A.	Diffusion and turbulent mixing
B.	Osmosis and agitation
C.	Turbulent mixing and osmosis
D.	Agitation and turbulent mixing
Answer» B. Osmosis and agitation

Discussion

173.	Which of the following is intended to be a first cut or rough inspection device to be followed by more precise evaluation of any discontinuities found?
A.	Wheel transducer
B.	Focused transducer
C.	Paintbrush transducer
D.	Ball transducer
Answer» D. Ball transducer

Discussion

174.	Which of the following characteristics would be most important in a test piece which is to be tested using the residual method?
A.	High rententivity
B.	High permeability
C.	Low reluctance
D.	Low permeability
Answer» B. High permeability

Discussion

175.	Other factors being equal, which of the following transducers would have the greatest beam spread?
A.	A larger diameter transducer
B.	A smaller diameter transducer
C.	A higher frequency transducer
D.	None of the above has any effect
Answer» C. A higher frequency transducer

Discussion

176.	The most significant difference in two X ray beams produced at different kV settings is:
A.	Beam intensity
B.	Exposure
C.	Wavelength distribution
D.	Beam divergence
Answer» D. Beam divergence

Discussion

177.	All other factors being equal, which of the following modes of vibration has the greatest velocity?
A.	Shear wave
B.	Transverse wave
C.	Surface wave
D.	Longitudinal wave
Answer» E.

Discussion

178.	A problem which could be caused by a penetrant with abnormally high water content is:
A.	Hydrogen assisted cracking
B.	Rusting of steel parts
C.	Water contamination
D.	Blurring of indications
Answer» C. Water contamination

Discussion

179.	Calculate geometric unsharpness for the following conditions: Source size = 2 mm 2 mm; SFD = 700 mm; test piece thickness = 25 mm
A.	0.6 mm
B.	0.06 mm
C.	6,0 mm
D.	0.15 mm
Answer» E.

Discussion

180.	What method provides greater sensitivity, particularly in locating subsurface discontinuities?:
A.	Continuous
B.	Residual
C.	Circular
D.	Longitudinal
Answer» B. Residual

Discussion

181.	Which of the following represents ultraviolet light of wavelengths which are potentially injurious (1 = 10-10m)
A.	2000 to 3200
B.	3200 to 4000
C.	4000 to 4600
D.	4600 to 5200
Answer» B. 3200 to 4000

Discussion

182.	The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by:
A.	The frequency of the transducer
B.	The diameter of the transducer
C.	The length of transducer cable
D.	Both (a) and (b)
Answer» E.

Discussion

183.	Mercury vapour black lights may be extinguished if the supply voltage drops below about:
A.	120 volts
B.	90 volts
C.	220 volts
D.	200 volts
Answer» E.

Discussion

184.	When the orientation of likely discontinuities is unknown, what is the minimum number of magnetising operations required to perform an adequate test?
A.	1
B.	2
C.	3
D.	None of the above
Answer» C. 3

Discussion

185.	If a crack exists in a circular magnet, the attraction of magnetic particles to the crack is caused by:
A.	A coercive force
B.	A leakage field
C.	A Doppler effect
D.	A high reluctance at the crack
Answer» C. A Doppler effect

Discussion

186.	The portion of a test piece which is represented by the CRT screen area from zero to the rightmost edge of the initial pulse is called:
A.	The dead zone
B.	The near field
C.	The near zone
D.	The far zone
Answer» C. The near zone

Discussion

187.	A photon-nuclear interaction in which energy is converted into sub-atomic particles is called:
A.	The photoelectric effect
B.	The Compton effect
C.	Pair production
D.	Bremsstrahlung
Answer» D. Bremsstrahlung

Discussion

188.	Which of the following circuits provides short duration, high energy pulses which are used to excite the transducer?
A.	The pulse generator
B.	The amplifier
C.	The transducer
D.	The clock
Answer» B. The amplifier

Discussion

189.	AA screen pattern containing a large number of low-level indications (often reffered to as 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

Discussion

190.	A photon-electron interaction in which a photon gives up a portion of its energy to an electron is called:
A.	The photoelectric effect
B.	The Compton effect
C.	Pair production
D.	Bremsstrahlung
Answer» C. Pair production

Discussion

191.	The general method of producing X rays involves the sudden deceleration of high velocity electrons in a solid body called a:
A.	Focus cup
B.	Filament
C.	Target
D.	Cathode
Answer» D. Cathode

Discussion

192.	A photon-electron interaction in which a photon gives up all its energy to an electron is called:
A.	The photoelectric effect
B.	The Compton effect
C.	Pair production
D.	Bremsstrahlung
Answer» B. The Compton effect

Discussion

193.	When the penumbra on a radiograph measures less than 0.5 mm (0.020 inches), the image will appear to unaided eye of the film interpreter as:
A.	Fuzzy
B.	Sharp
C.	Distorted
D.	Dark
Answer» C. Distorted

Discussion

194.	Which of the following test frequencies would generally provide the best penetration in a 12 inch thick specimen of coarse-grained steel?
A.	1.0 MHz
B.	2.25 MHz
C.	5.0 MHz
D.	10 MHz
Answer» B. 2.25 MHz

Discussion

195.	Under most circumstances, which of the following frequencies would result in the best resolving power?
A.	1 MHz
B.	5 MHz
C.	10 MHz
D.	25 MHz
Answer» E.

Discussion

196.	An interaction in which radiation is produced by the rapid deceleration of an electron is called:
A.	The photoelectric effect
B.	The Compton effect
C.	Pair production
D.	Bremsstrahlung
Answer» E.

Discussion

197.	In an A scan presentation, the amplitude of vertical indications on the screen represents the:
A.	Amount of ultrasonic sound energy returning to the search unit
B.	Distance travelled by the search unit
C.	Thickness of material being tested
D.	Elapsed time since the ultrasonic pulse was generated
Answer» B. Distance travelled by the search unit

Discussion

198.	An instrument display in which the horizontal base line represents elapsed time and the 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

Discussion

199.	It is possible for a discontinuity smaller than the transducer to produce indications of fluctuating amplitude as the search unit is moved laterally if testing is being performed in the:
A.	Fraunhofer zone
B.	Near field
C.	Snell field
D.	Shadow zone
Answer» C. Snell field

Discussion

200.	Which of the following welding discontinuities would be most difficult to image radiographically:
A.	Planar lack of fusion
B.	Incomplete penetration
C.	Undercut
D.	Slag inclusions
Answer» B. Incomplete penetration

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

AA test method employing two seperate search units on opposite surfaces of the material being tested is called:

The piezoelectric material in a search unit which vibrates to produce ultrasonic waves is called:

Calculate the refracted shear wave angle in steel [VS = 0.323cm/microsec] for an incident longitudinal wave of 37.9 degrees in Plexiglas [VL = 0.267cm/microsec]

Calculate the refracted shear wave angle in steel [VS = 0.323cm/microsec] for an incident longitudinal wave of 45.7 degrees in Plexiglas [VL = 0.267cm/microsec]

Calculate the refracted shear wave angle in aluminium [VS = 0.31cm/microsec] for an incident longitudinal wave of 43.5 degrees in Plexiglas [VL =0.267cm/microsec]

Calculate the refracted shear wave angle in aluminium [VS = 0.31cm/microsec] for an incident longitudinal wave of 53 degrees in Plexiglas [VL = 0.267cm/microsec]

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

When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo?

Compared to the echo returned from a smooth reflector, the echo returned from a natural flaw of the same area and orientation is:

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

Which of the following is the most effective method for the detection of extremely deep-lying defects:

A smooth flat discontinuity whose major plane is not perpendicular to the direction of sound propagation may be indicated by:

AA term used in ultrasonics to express the rate at which sound waves pass through various substances is:

The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 cm or 1 foot) is attenuated in air to approximately 5mR/h at a distance of approximately:

AA display which shows the initial pulse and the front surface echo superimposed would be considered:

AA display which shows the initial pulse and the front surface echo with a fairly wide space between the two would be considered:

In a basic pulse-echo ultrasonic instrument, the component that produces the time base line is called a:

Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?

The amount of beam divergence from a crystal is primarily dependent on the:

The scattering of the rays of an ultrasonic beam due to reflection from a highly irregular surface is called:

In the radiographic analysis procedure that is used to prepare an exposure chart, the first step is to:

When a drain-dwell technique is used during emulsification, what two mechanisms are responsible for combining the emulsifier and penetrant?

Which of the following is intended to be a first cut or rough inspection device to be followed by more precise evaluation of any discontinuities found?

Which of the following characteristics would be most important in a test piece which is to be tested using the residual method?

Other factors being equal, which of the following transducers would have the greatest beam spread?

The most significant difference in two X ray beams produced at different kV settings is:

All other factors being equal, which of the following modes of vibration has the greatest velocity?

A problem which could be caused by a penetrant with abnormally high water content is:

Calculate geometric unsharpness for the following conditions: Source size = 2 mm 2 mm; SFD = 700 mm; test piece thickness = 25 mm

What method provides greater sensitivity, particularly in locating subsurface discontinuities?:

Which of the following represents ultraviolet light of wavelengths which are potentially injurious (1 = 10-10m)

The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by:

Mercury vapour black lights may be extinguished if the supply voltage drops below about:

When the orientation of likely discontinuities is unknown, what is the minimum number of magnetising operations required to perform an adequate test?

If a crack exists in a circular magnet, the attraction of magnetic particles to the crack is caused by:

The portion of a test piece which is represented by the CRT screen area from zero to the rightmost edge of the initial pulse is called:

A photon-nuclear interaction in which energy is converted into sub-atomic particles is called:

Which of the following circuits provides short duration, high energy pulses which are used to excite the transducer?

AA screen pattern containing a large number of low-level indications (often reffered to as hash ) could be caused by:

A photon-electron interaction in which a photon gives up a portion of its energy to an electron is called:

The general method of producing X rays involves the sudden deceleration of high velocity electrons in a solid body called a:

A photon-electron interaction in which a photon gives up all its energy to an electron is called:

When the penumbra on a radiograph measures less than 0.5 mm (0.020 inches), the image will appear to unaided eye of the film interpreter as:

Which of the following test frequencies would generally provide the best penetration in a 12 inch thick specimen of coarse-grained steel?

Under most circumstances, which of the following frequencies would result in the best resolving power?

An interaction in which radiation is produced by the rapid deceleration of an electron is called:

In an A scan presentation, the amplitude of vertical indications on the screen represents the:

An instrument display in which the horizontal base line represents elapsed time and the vertical deflection represents signal amplitudes is called:

It is possible for a discontinuity smaller than the transducer to produce indications of fluctuating amplitude as the search unit is moved laterally if testing is being performed in the:

Which of the following welding discontinuities would be most difficult to image radiographically: