RT Questions 1
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1.
In certain cases it may be advantageous to pack lead shot around a specimen. The purpose for doing this is:
2.
Two factors which greatly affect the suitability of the target material in an X-ray tube are:
3.
If a specimen is radiographed at 140 kV and again at 150 kV with time compensation to give equal density, which is true?
4.
A general rule governing geometric principles of shadow formation states that:
5.
In comparison with lower voltage radiographs, high energy radiographs show:
6.
A radiograph is taken at 500 kV. If voltage is increased while all else stays the same:
7.
Radiation absorption by material from a given source depends on:
8.
A distinctive characteristic of high voltage radiography is:
9.
Selection of the proper type of film for X-ray exam of a particular part depends on:
10.
Cobalt-59 becomes Cobalt-60 in a nuclear reactor when it captures:
11.
In an X-ray tube, the filament and focusing cup are the two essential parts of the:
12.
A 250 kVp X-ray machine used with lead foil screens has an approximately practical thickness limit of:
13.
The purpose for including a disc-shaped target that rotates rapidly in some X-ray tubes is to:
14.
Side scatter can cause which type of effect on the radiograph?
15.
The function of a film interpreter is to:
16.
Sharp, black, bird-foot shaped marks (not corresponding to discontinuities) are probably caused by:
17.
A voltage selector consisting of an iron-core transformer with a single tapped winding is called:
18.
Decrease in gamma ray energy when passing through a specimen is commonly caused by:
19.
The range of specimen thickness that can be adequately recorded on a radiograph is referred to as the:
20.
The quantity of radiation striking a unit area of film:
21.
In million-volt radiography, filtration at the tube:
22.
An X-ray tube with a small focal spot is considered better than one with a large focal spot when it is desired to obtain:
23.
The amount of unsharpness or blurring of a radiograph is:
24.
A device which is basically a combination of magnet and transformer designed to guide and accelerate electrons in a circular orbit to very high energies is called:
25.
The maximum practical speed of scanning a test object for conventional fluoroscopic inspection has been estimated to be:
26.
Which of the following will NOT materially influence the image density of a radiograph?
27.
In order to increase the intensity of X-radiation:
28.
Filters placed between the X-ray tube and specimen tend to reduce scatter undercutting by:
29.
While preparing RT technique using X-ray, kilovoltage should be selected:
30.
The function of the stop bath during manual film processing is to:
31.
Constant agitation of the developer during processing by mechanical stirrers or circulating pumps may:
32.
Radiographic undercutting is caused by:
33.
Maximum load that can be handled by an X-ray tube focal spot is governed by:
34.
Films kept between lead screens in a cassette for a long period in high temperature/humidity may:
35.
A curve that relates density with the logarithm of exposure or relative exposure is called:
36.
The purpose of keeping lead screens in direct contact with the film is to:
37.
When X-rays, gamma rays, light or electrons strike the photographic emulsion, change in silver halide crystals is referred to as:
38.
When a faster speed film is substituted for a slower one to improve exposure economics, which condition occurs?
39.
Which technique variable is most commonly used to adjust subject contrast?
41.
IQI for stainless steel are considered:
42.
Radiographic accessories requiring mandatory calibration are:
43.
If a processed film allows 1/10 of incident light to pass through, the optical density of the film is:
44.
Double-wall double-image technique is used limited for:
45.
The maximum size of irrelevant indications for ½″ thick welded plate radiographed as per UW-51 of ASME Section VIII Div. 1 will be:
46.
The amount of unsharpness of image (Ug) permitted for a 38 mm thick object is:
47.
Acceptable density variation in area of interest compared to density through the IQI image:
48.
30 mm thick Monel weld with 1.5 mm reinforcement on each side, which IQI/shim combination?
49.
Closing-seam circular weld 30″ dia × 15 mm thk CS, no internal access — choose technique & IQI:
50.
Per ASME Section VIII Division 1, a non-relevant indication is subject to:
51.
In spot radiography per UW-52 of ASME Section VIII Division 1:
53.
When using gamma rays, the transmitted minimum film density required on a radiograph is:
54.
Lead letter "B" used to detect backscatter should be at least:
55.
The quality of the radiograph identified as 2-1T means:
The thickness of IQI should be 2 mm and hole visible should be 1 mm
Thickness of IQI = 1% of object thickness, essential hole visible 2T (T = IQI thickness)
Thickness of IQI = 2% of object thickness, essential hole visible 1T (T = thickness of object)
The thickness of the IQI should be 2% of the object thickness and essential visible should be 1T where T is the thickness of the IQI
56.
Surveyor rejected radiograph of 25 mm CS plate with Ir-192, ASTM SS-20 source-side, IQI shows all 3 holes, 0.015″ porosity scattered. Which statement is correct?
57.
Periodic calibration verification of densitometer should be performed:
58.
For curved component with SFD greater than radius of curvature, location markers are on:
59.
When is protection from backscatter found insufficient and the radiograph unacceptable?
60.
For a weld with reinforcement at outside and ground flush at inside, the thickness on which the IQI is based is:
61.
Calculate Ug: focal spot 3 mm, OFD 25 mm, SOD 600 mm. Per ASME V T-274 (≤2″ thickness):
62.
To radiograph a 25 mm CS butt weld with Ir-192 source, a typical SFD that gives Ug ≤ 0.020″ and reasonable exposure for a 4 mm × 2 mm source is approximately:
63.
A radiograph of a 12 mm CS weld shows IQI no.15 essential hole 2T visible, density 2.2 H&D, no backscatter shadow. The radiograph quality is:
64.
Through-IQI density on a radiograph reads 2.50 H&D. Adjacent area-of-interest density reads 3.50. Per ASME V T-282.2:
65.
During panoramic exposure of a 6″ NPS pipe weld, you must place the source at the centre. Locating the source 2 mm off-centre with 6 mm wall thickness will:
66.
On a stainless-steel weld with Ir-192, you obtain density 1.9 H&D using SS step-wedge IQI #25 (no shim). Per ASME V you should:
67.
A welder cap height adds 1.5 mm reinforcement on each side of a 25 mm CS plate weld. What thickness is used to select the IQI?
68.
You exposed a film and read step-wedge density 0.05 above the calibrated value. The likely cause is:
69.
During interpretation of a CS weld radiograph you observe a dark, sharply rounded indication 1.6 mm diameter. Per UW-51 of ASME Section VIII Div 1 acceptance criteria for ½″ plate, this is:
70.
Two parallel linear indications, each 5 mm long and separated by 6 mm, in a 25 mm CS weld. Per UW-51 these are:
71.
Backscatter check shows a faint dark image of the lead 'B' on a lighter background. The radiograph is:
72.
Selecting between Ir-192 and Co-60 for 75 mm CS weld:
73.
Under what condition can DWDI technique be used per ASME V?
74.
Density variation across film width on a 12 m circumferential exposure exceeds tolerance in the over-exposed end. The MOST LIKELY cause is:
75.
To increase subject contrast on an aluminium part, the technician should:
76.
During development the technician notices the radiograph emerging too 'flat' (low contrast). Likely cause:
77.
Weld with reinforcement at outside, ground flush at inside. IQI placement:
78.
During Ir-192 exposure, your survey meter reads 1 mR/hr at the rope barrier 12 m away. If you halve the distance to 6 m, the reading will be approximately:
79.
Lead screen front 0.005″ / back 0.010″ used with X-ray ≤ 250 kVp serves to:
80.
To document an exposure, the radiographer's technique sheet should AT MINIMUM include: