1267 + Mcqs in Testing McqOptions

1.	Dark rounded indications with rather smooth edges appear on the radiograph of castingmade in sand mould. These indications would be interpreted as:
A.	Slag inclusions
B.	Misrun
C.	Shrinkage
D.	Gas holes
Answer» E.

Discussion

2.	A prod method would be most sensitive to cracks:
A.	Parallel to a line connecting the prod contact points
B.	Tangential to a radius from each prod contact point
C.	Perpendicular to a line connecting the prod contact points
D.	Perpendicular to the long axis of the coil
Answer» B. Tangential to a radius from each prod contact point

Discussion

3.	Echo amplitude losses may be caused by:
A.	Entry surface roughness
B.	Coarse grain size
C.	Discontinuity orientation
D.	All of the above
Answer» E.

Discussion

4.	A liquid which reacts with a penetrant to render it water washable is called:
A.	Developer
B.	Emulsifier
C.	Aqueous scrubber
D.	Non-aqueous cleaner
Answer» C. Aqueous scrubber

Discussion

5.	Most contact testing is performed by which of the following techniques?
A.	Through transmission
B.	Pitch-catch
C.	Pulse-echo
D.	Continuous wave
Answer» D. Continuous wave

Discussion

6.	The most common material used for targets in X ray tubes is:
A.	Tungsten
B.	Copper
C.	Silver
D.	Beryllium
Answer» B. Copper

Discussion

7.	According to ASTM E709-95 in using prods having a spacing of 19 mm (3/4 inches)and above, the magnetizing current shall be:
A.	From 90 to 110 A/25 mm (1 inch)
B.	From 100 to 125 A/25 mm (1 inch)
C.	From 90 to 120 A/ 25 mm (1 inch)
D.	From 100 to 200 A/25 mm (1 inch)
Answer» C. From 90 to 120 A/ 25 mm (1 inch)

Discussion

8.	During immersion testing of pipe or tubing the incident longitudinal wave angle mustbe limited to a narrow range. The reason for the upper limit is:
A.	To avoid complete reflection of ultrasound from the test piece
B.	To prevent formation of Rayleigh waves
C.	To prevent formation of shear waves
D.	To avoid saturating the test piece with ultrasound
Answer» B. To prevent formation of Rayleigh waves

Discussion

9.	What is the preferred pre-cleaning process for removal of oil and grease :
A.	Steam cleaning with a added acid
B.	Vapour degreasing
C.	Steam cleaning
D.	Ultrasonic cleaning
Answer» C. Steam cleaning

Discussion

10.	Calculate the refracted shear wave angle in steel [VS = 0.323cm/microsec] for anincident 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

11.	The focal spot size of an X ray machine must be known in order to determine:
A.	The geometric unsharpness
B.	Kilovoltage peak output
C.	Required mA setting
D.	Exposure time
Answer» B. Kilovoltage peak output

Discussion

12.	A radiographic exposure with 3700 GBq (100 Ci) source of Ir-192 using source to filmdistance of 60 cm results in a radiation intensity of 0.12 Gy/h (11.8 R/h) and a radiographic density of 2.5. The intensity of radiation needed to obtain the same density when the source to film distance is changed to120 cm is:
A.	0.472 Gy/h (47.2R/h)
B.	0.118 Gy/h (11.8 R/h)
C.	0.029 Gy/h (2.9 R/h)
D.	0.236 Gy/h (23.6 R/h)
Answer» D. 0.236 Gy/h (23.6 R/h)

Discussion

13.	A A plan view representation of a test piece is produced by which of the following?
A.	A scan
B.	B scan
C.	C scan
D.	A time line display
Answer» D. A time line display

Discussion

14.	The formula, NI = 45000/(L/D), gives proper magnetising current for a coil, regardlessof coil size as long as:
A.	The test piece is not larger than 1/10 the cross sectional area of the coil
B.	AC current only is used
C.	The test piece essentially fills the coil
D.	The test piece is held tightly against the coil
Answer» B. AC current only is used

Discussion

15.	Which of the following does not represent a limitation of magnetic particle testing?
A.	The type of materials which may be effectively tested
B.	The directionality of the magnetic field
C.	The need for demagnetization
D.	The ability to detect discontinuities filled with foreign material
Answer» E.

Discussion

16.	In which magnetizing method is the current passed directly through the part, therebysetting up a magnetic field at right angles to the current flow?
A.	Longitudinal magnetization
B.	Coil magnetization
C.	Central conductor magnetization
D.	None of the above
Answer» E.

Discussion

17.	In the solvent removable penetrant process, excess penetrant is removed with:
A.	A water spray
B.	A hydrophilic scrubber
C.	A solvent spray
D.	Clean, lint free towels slightly moistened with solvent
Answer» E.

Discussion

18.	One half value layer of lead for Iridium-192 is approximately:
A.	12 mm
B.	4 mm
C.	2 mm
D.	25 mm
Answer» D. 25 mm

Discussion

19.	The most common harmful effect of exposure to black light is:
A.	Eyeball fluorescence
B.	Burned retinas
C.	Skin burns
D.	None of the above
Answer» B. Burned retinas

Discussion

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

Discussion

21.	A reason for using a dual element search unit is:
A.	Improving near surface resolution
B.	Improving penetration
C.	Eliminating wear on the crystal faces
D.	None of the above
Answer» B. Improving penetration

Discussion

22.	Magnetic particle test indications which are due to cold work can best be removed by:
A.	Demagnetisation
B.	Using a lower current
C.	Re-crystallisation
D.	Heat treating
Answer» E.

Discussion

23.	The average energy of a T3-170 source is approximately:
A.	60-80 keV
B.	660 keV
C.	400 keV
D.	1.2 MeV
Answer» B. 660 keV

Discussion

24.	The most important penetrant test processing time to control is:
A.	Penetrant dwell time
B.	Emulsifier dwell time
C.	Water rinse time
D.	Development time
Answer» B. Emulsifier dwell time

Discussion

25.	The purpose of the couplant is to:
A.	Match impedances between the transducer and test piece
B.	Absorb stray reflectors
C.	Clean the test piece so a more efficient test may be continued
D.	Lock the ultrasonic scanner into place prior to testing
Answer» B. Absorb stray reflectors

Discussion

26.	When a magnetic field is induced in a part with prods spaced 150mm apart, the fieldis:
A.	Solenoidal
B.	Circular
C.	Longitudinal
D.	Distorted trapezoidal
Answer» C. Longitudinal

Discussion

27.	According to ASTM E709-95 when fluorescent particles are used, the bulb shall bewarmed up prior to use for at least:
A.	1 min
B.	2 min
C.	3 min
D.	4 min
Answer» E.

Discussion

28.	An advantage of AC is that:
A.	It is most readily available
B.	Equipment can be made lighter
C.	It leaves the part demagnetized
D.	All of the above
Answer» E.

Discussion

29.	The diffusion mechanism is used in the operation of:
A.	Solvent removable penetrant
B.	Lipophilic emulsifiers
C.	Hydrophilic emulsifiers
D.	Both b and c
Answer» C. Hydrophilic emulsifiers

Discussion

30.	Excess penetrant removal is a two step process with which of the following penetrantmethods?
A.	Water washable
B.	Post emulsifiable
C.	Solvent removable
D.	Liquid oxygen applications
Answer» C. Solvent removable

Discussion

31.	A bar that is 5 cm (2 inches) by 10 cm (4 inches) by 30.5 cm (12 inches) is being magnetized in the circular direction. About how many amperes are required using the perimeter approach?
A.	2200
B.	4500
C.	3800
D.	None of the above
Answer» D. None of the above

Discussion

32.	Which of the following is not an advantage of a focused transducer?
A.	High sensitivity to small flaws
B.	Deep penetration
C.	High resolving power
D.	Not much affected by surface roughness
Answer» C. High resolving power

Discussion

33.	An ultrasonic instrument control which allows moving an A scan display to the left orright without changing the distance between any echoes displayed is called:
A.	The sweep length or range control
B.	The damping control
C.	The sweep delay
D.	The pulse length control
Answer» D. The pulse length control

Discussion

34.	A material with a narrower hysteresis loop has:
A.	Higher permeability
B.	Lower retentivity
C.	Lower coercive force
D.	All of the above
Answer» E.

Discussion

35.	The fundamental frequency of a piezoelectric crystal is primarily a function of:
A.	The length of the applied voltage pulse
B.	The amplifying characteristics of the pulse amplifier in the instrument
C.	The thickness of the crystal
D.	None of the above
Answer» D. None of the above

Discussion

36.	The amount of radioactivity which corresponds to 3.7 × 1010 disintegrations per secondis called:
A.	0.01 gray (1 rad)
B.	1 Farad
C.	37 GBq (1 curie)
D.	10 mSv (1 roentgen)
Answer» D. 10 mSv (1 roentgen)

Discussion

37.	A wire brush should be used for pre-cleaning:
A.	When grease and oil must be removed
B.	Only as a last resort
C.	When rust is to be removed
D.	When grinding burrs must be removed
Answer» D. When grinding burrs must be removed

Discussion

38.	The most likely cause of loss of performance in a lipophilic emulsifier is:
A.	High viscosity
B.	Water contamination
C.	Phase separation
D.	Improper concentration
Answer» C. Phase separation

Discussion

39.	A penetrant process in which excess penetrant is removed with an organic solvent iscalled:
A.	Solvent removable
B.	Water washable
C.	Post-emulsified
D.	Dual method
Answer» B. Water washable

Discussion

40.	A minimum of external poles are produced by what type of magnetisation?
A.	Continuous
B.	Residual
C.	Circular
D.	Longitudinal
Answer» D. Longitudinal

Discussion

41.	Compared to the echo returned from a smooth reflector, the echo returned from anatural 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

42.	Which technique would most likely be used to examine a weld, with the weld cap stillin place?
A.	Through transmission testing
B.	Angle beam testing
C.	Straight beam testing
D.	None of the above
Answer» C. Straight beam testing

Discussion

43.	Radiographic enlargement to distinguish small defects is possible:
A.	Only with a very small source or focal spot size radiation source
B.	Routinely
C.	With most sources
D.	Never
Answer» B. Routinely

Discussion

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

Discussion

45.	Source-to-object distance, object-to-film distance, and source size are the three factorsthat control the of the radiograph.
A.	Density
B.	Exposure
C.	Film size
D.	Unsharpness
Answer» E.

Discussion

46.	Resolving power of a transducer is directly proportional to its:
A.	Wavelength
B.	Crystal thickness
C.	Bandwidth
D.	Q
Answer» D. Q

Discussion

47.	When a small diameter tube is placed in a glass of water, water rises in the tube to alevel above the adjacent surface. This is called:
A.	Viscosity
B.	Capillary action
C.	Surface tension
D.	Barometric testing
Answer» C. Surface tension

Discussion

48.	A radiographic indication in a weld, characterised by two parallel dark lines in the filmimage, would probably be caused by:
A.	Incomplete penetration
B.	Lack of fusion
C.	Slag inclusions
D.	Tungsten inclusions
Answer» C. Slag inclusions

Discussion

49.	The most effective NDT method for locating surface cracks in ferromagnetic materials is:
A.	Ultrasonic testing
B.	Radiographic testing
C.	Magnetic particles testing
D.	Liquid penetrant testing
Answer» D. Liquid penetrant testing

Discussion

50.	Which type of developer does not (!) provide a contrasting background against whichto view penetrant indications?
A.	Dry
B.	Non-aqueous wet
C.	Water soluble
D.	Water suspendable
Answer» B. Non-aqueous wet

Discussion

Explore topic-wise MCQs in Testing Subject.

Dark rounded indications with rather smooth edges appear on the radiograph of castingmade in sand mould. These indications would be interpreted as:

A prod method would be most sensitive to cracks:

Echo amplitude losses may be caused by:

A liquid which reacts with a penetrant to render it water washable is called:

Most contact testing is performed by which of the following techniques?

The most common material used for targets in X ray tubes is:

According to ASTM E709-95 in using prods having a spacing of 19 mm (3/4 inches)and above, the magnetizing current shall be:

During immersion testing of pipe or tubing the incident longitudinal wave angle mustbe limited to a narrow range. The reason for the upper limit is:

What is the preferred pre-cleaning process for removal of oil and grease :

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

The focal spot size of an X ray machine must be known in order to determine:

A A plan view representation of a test piece is produced by which of the following?

The formula, NI = 45000/(L/D), gives proper magnetising current for a coil, regardlessof coil size as long as:

Which of the following does not represent a limitation of magnetic particle testing?

In which magnetizing method is the current passed directly through the part, therebysetting up a magnetic field at right angles to the current flow?

In the solvent removable penetrant process, excess penetrant is removed with:

One half value layer of lead for Iridium-192 is approximately:

The most common harmful effect of exposure to black light is:

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

A reason for using a dual element search unit is:

Magnetic particle test indications which are due to cold work can best be removed by:

The average energy of a T3-170 source is approximately:

The most important penetrant test processing time to control is:

The purpose of the couplant is to:

When a magnetic field is induced in a part with prods spaced 150mm apart, the fieldis:

According to ASTM E709-95 when fluorescent particles are used, the bulb shall bewarmed up prior to use for at least:

An advantage of AC is that:

The diffusion mechanism is used in the operation of:

Excess penetrant removal is a two step process with which of the following penetrantmethods?

A bar that is 5 cm (2 inches) by 10 cm (4 inches) by 30.5 cm (12 inches) is being magnetized in the circular direction. About how many amperes are required using the perimeter approach?

Which of the following is not an advantage of a focused transducer?

An ultrasonic instrument control which allows moving an A scan display to the left orright without changing the distance between any echoes displayed is called:

A material with a narrower hysteresis loop has:

The fundamental frequency of a piezoelectric crystal is primarily a function of:

The amount of radioactivity which corresponds to 3.7 × 1010 disintegrations per secondis called:

A wire brush should be used for pre-cleaning:

The most likely cause of loss of performance in a lipophilic emulsifier is:

A penetrant process in which excess penetrant is removed with an organic solvent iscalled:

A minimum of external poles are produced by what type of magnetisation?

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

Which technique would most likely be used to examine a weld, with the weld cap stillin place?

Radiographic enlargement to distinguish small defects is possible:

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

Source-to-object distance, object-to-film distance, and source size are the three factorsthat control the of the radiograph.

Resolving power of a transducer is directly proportional to its:

When a small diameter tube is placed in a glass of water, water rises in the tube to alevel above the adjacent surface. This is called:

A radiographic indication in a weld, characterised by two parallel dark lines in the filmimage, would probably be caused by:

The most effective NDT method for locating surface cracks in ferromagnetic materials is:

Which type of developer does not (!) provide a contrasting background against whichto view penetrant indications?