Conventional RT Question & Answers_Specific

1. RADIOGRAPHY TESTING
1. To determine if backscatter radiation is exposing the film or not, a lead symbol
‘B’ using. The thickness of this letter is
a. 13mm
b. 1.3mm
c. 1.6mm
d. 16mm
2. Double wall double image technique can be used
a. In dia of component more than 90mm
b. In dia of component less than 90mm
c. In dia of component less than 31/2inch
d. In dia of component more than 89mm
3. Which hole type IQI should require for job thickness of 0.55 inch, if IQI placed at
film side?
a. 17
b. 20
c. 25
d. 15
4. For job thickness 65mm, maximum permissible Ug is
a. 0.02 inch
b. 0.03 inch
c. 0.04 inch
d. 0.07 inch
5. For Weld thickness ‘t’ less than 3.2mm the maximum number of rounded
indications shall not exceed
a. 10 in a 152mm length of weld
b. 12 in a 152mm length of weld
c. 15 in a 152mm length of weld
d. 6 in a 152mm length of weld
6. Which of the following defects would be most difficult to observe
radiographically ?
a. Porosity
b. Undercut
c. Overlap / Cold lap
d. Slag line

2. RADIOGRAPHY TESTING
7. Identify on Figure One, where lack of fusion may occur?
a. 1
b. 2
c. 3
d. 4
8. Identify on Figure One, where lack of penetration may occur?
a. 3
b. 2
c. 4
d. 6
9. Identify on Figure One, where undercut would occur?
a. 1
b. 2
c. 6
d. 3
10. Identify on Figure One at the bottom of the page, where heat affected zone
cracking may occur?
a. 1
b. 2
c. 3
d. 4
11. A black jagged line is noted on a radiograph of the change in section of a casting.
What is the most likely cause of this indication?
a. Filamentary shrinkage
b. Hot tear
c. Micro shrinkage
d. Sand inclusion
12. When two bodies of molten metal fail to fuse in a casting the resultant
discontinuity is called?
a. A misrun
b. Lack of fusion
c. Cold shut
d. All of the above

3. RADIOGRAPHY TESTING
13. A metal device used to support the core inside the mould of a casting is called?
a. Chaplet
b. Chill
c. Core shift
d. Feeder head
14. Which of the following cast defects could easily be radiographically interpreted
as a crack?
a. Sand inclusions
b. Blow holes
c. Hot tears
d. Shrinkage
15. A black line 2mm wide is noted on a radiograph. It runs from the cast surface
into the casting.
Which of the following is the best description of this indication?
a. Wormhole
b. Blowhole
c. Porosity
d. Sand inclusion
16. A dark patchy area is noted on a radiograph in the centre of a parallel sided cast
section. Which of the following discontinuities is this likely to be?
a. Sand inclusion
b. Wormhole
c. Shrinkage
d. Cold shut
17. A metal insert in the mould surface used to increase the cooling rate in that area
is called?
a. A chaplet
b. A cooler
c. A core
d. A chill

4. RADIOGRAPHY TESTING
18. A reservoir of molten metal used to reduce the effects of solidification shrinkage
is called?
a. A feeder
b. A runner
c. A flask
d. A hot spot
19. When radiographing the butt weld end of a casting using the single wall single
image method it is noticed that the density varies around the butt weld end
assuming there has been no changes in exposure or development, what may
have caused this condition?
a. Shrinkage
b. Chill
c. Core shift
d. Unfused chaplet
20. Which of the following could give rise to a leakage path through the wall of a
casting?
a. Core shift
b. A chill
c. An unfused chaplet
d. A sand inclusion
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5. RADIOGRAPHY TESTING
1. c 11. b
2. c 12. c
3. b 13. a
4. b 14. c
5. b 15. b
6. c 16. c
7. b 17. d
8. c 18. a
9. d 19. c
10. a 20. c