General 3.1 & 3.2 questions

Question 1

1 In which of the following would you expect to find lamellar tearing

A unwelded steel plates
B large aluminium castings
C centre butt welds
D none of the above

Answer 1

c

Question 2

2 A pre-dive briefing should include

A length of dive
B tide condition
C inspection information and why
D None of the above

Answer 2

c

Question 3

3 What is the most common method of concrete inspection

A M.P.I
B U.T
C visual
D radiography

Answer 3

c

Question 4

4 Which type of U.T waves are used in water

A surface wave
B shear waves
C longitudinal
D all waves

Answer 4

D

Question 5

5 A defect 4mm below surface can be located by

A A.C.F.M.
B closed loop parallel conductor using A.C
C stainless steel
D none of the above

Answer 5

a

Question 6

6 Magnetic ink composition is mainly made of

A iron oxide
B ferric chloride
C coarse iron filings
D fine ferrous-oxide

Answer 6

d

Question 7

7 What is the preferred method to remove marine growth

A water jet
B pneumatic grinder
C hydraulic grinder
D all of the above

Answer 7

a

Question 8

8 Which of these is a concrete in service defect

A fatigue cracks
B hot tears
C diffraction mottling
D none of the above

Answer 8

d

Question 9

9 Which of these measures corrosion rate

A M.P.I.
B A scan
C U.T meter
D C.P. meter

Answer 9

d

Question 10

10 Which of the following would increase the marine growth rate

A temperature decrease
B depth increase
C depth decrease
D none of the above

Answer 10

c

Question 11

11 Wavelength is dependant on the°°

A diameter of the probe
B density of the material under test
C sound velocity and frequency
D all of the above

Answer 11

c

Question 12

12 longitudinal defects in a longitudinal weld can be readily detected by

A longitudinal magnetism
B a circumferential magnet
C a coil at 90° to the weld
D none of the above

Answer 12

c

Question 13

13 Using a coil it has been calculated that 2000 ampere turns are necessary, if the coil has four turns the magnetic current will be

A 2000 amps
B 8000 amps
C 500 amps
D 400 amps

Answer 13

b

Question 14

14 The speed of photographic emulsion is affected by

A the size of the film
B size of the aperture
C amount of light available
D none of the above

Answer 14

c

Question 15

15 The maximum water depth that pneumatic entrainment of abrasives can efficiently be used is

A 3m
B 30m
C 50m
D 120m

Answer 15

B

Question 16

16 Laminations and solid inclusions are found

A in steel plates
B in steel pipes
C with ultrasonic inspection
D all of the above

Answer 16

d

Question 17

17 Ultrasonic frequencies are above

A 20 MHZ
B 20 KHZ
C 20 HZ
D 2 HZ

Answer 17

b

Question 18

18 For the ideal inspection programme on a production platform

A close down the platform for a given period
B inspect known defects and possible defects
C do it as long as money is available
D do it as quickly as possible

Answer 18

b

Question 19

19 What is the difference between hard and soft marine growth

A the depth that it grows at
B density of the growth
C rate of growth
D colour of growth

Answer 19

b

Question 20

20 Radiography in underwater inspection is

A harmful
B never used
C requires access to both sides of the test piece
D is excellent for planar defect detection

Answer 20

a

Question 21

21 Vibrations are

A chemical energy
B electro/ chemical energy
C mechanical energy
D heat energy

Answer 21

c

Question 22

22 The underside of a concrete beam is called

A a soffit
B a splay
C a overhang
D the underside

Answer 22

a

Question 23

23 Reducing the frequency of a probe will result in

A a reduction of the attenuation
B small defects will be detected more easily
C penetration will be less
D beam spread will be less

Answer 23

a

Question 24

24 Essentially there are two types of marine growth one way to differentiate between them is

A the depth of water at which they grow
B the temperature at which they grow
C hard marine growth has a density of approximately 4 times sea water
D the density of growth in different areas of the structure

Answer 24

A

Question 25

25 The corrosion rate of steel in sea water will increase if A the water temperature increases B the water temperature decreases C water temperature does not affect the corrosion rate D the water is freshwater

Answer 25

a

Question 26

26 Using an A-scan display, a lack of parallelism will result in A a reflection that may not be indicated on the display B the most likely reflection would result in a display of numerical indications of variable amplitude C signal amplitude being greatly increased D signal amplitude being greatly reduced

Answer 26

B

Question 27

27 The single most important method of weld inspection is A M.P.I. B visual inspection C ultrasonics D radiography

Answer 27

b

Question 28

28 The velocity of compression waves of sound is quickest in A steel B water C aluminium D Perspex

Answer 28

a

Question 29

29 An inaccurate wall thickness measurement will result if A the material is laminated B there is a lack of parallelism between the back and front faces C the material is between 10mm and 15mm thick D the material is between 30mm and 40mm thick

Answer 29

B

Question 30

30 AC potential drop is used to A measure the depth of a surface-breaking crack B locate a sub surface defect C measure the length of a surface breaking crack D determine the width of a crack

Answer 30

a

Question 31

31 As light travels through water A the spectrum changes B it gains intensity C the beam is not affected by scattering D it is not affected at the air water interface

Answer 31

a

Question 32

32 U.V. light emits wavelengths of between A 365-400 angstroms B 365-400 nanometers C 1000-2000 angstroms D 500-600 nanometers

Answer 32

B

Question 33

33 One means of reducing the possibility of fatigue failure in welded joints is A use backing strips B flexible coatings C weld toe profiling D concrete coatings

Answer 33

c