CWB 2 ALL MODULE LATEST
EXAMS
When using an AC yoke, two test are done with the angle of the yoke at
90° to each other. Why?
A) To ensure good magnetic contact is maintained
B) Because discontinuities lying parallel to the line between the poles of
the yoke are not readily detected
C) To remove residual magnetism from the first test
D) Because discontinuities lying normal to the line between the poles of
the yoke are not readily detected
E) Two test are not necessary when using AC - ANSWERS-B) Because
discontinuities lying parallel to the line between the poles of the yoke
are not readily detected
What is the depth capability for AC magnetic particle methods?
A) 3mm
B) 3mm for AC prods only
C) 6mm in non-ferrous metals
D) 6mm in steel
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, CWB 2 ALL MODULE LATEST
EXAMS
E) No effective depth capability - ANSWERS-E) No effective depth
capability
Which of the following statements is true?
A) The eddy current method is based on detecting the flux leakage
around the discontinuity using a Fall detector
B) The eddy current method is based on detecting changes in the
inductive reactance of a coil due to disturbance of the eddy current by a
discontinuity and can be used on non-ferrous metals
C) The eddy current method is based on detecting changes to the
inductive reactance of a coil due to disturbance of the eddy current and
can only be used on ferromagnetic metals
D) The eddy current method is based on measuring the change in
voltage across a discontinuity when an eddy current flows
E) The eddy current method normally uses direct current to increase
depth capability - ANSWERS-B) The eddy current method is based on
detecting changes in the inductive reactance of a coil due to disturbance
of the eddy current by a discontinuity and can be used on non-ferrous
metals
Which of the following defects cannot be detected with LPI?
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, CWB 2 ALL MODULE LATEST
EXAMS
A) Fine tight surface cracks
B) Shallow and broad cracks
C) Incomplete fusion between weld and base metal open to surface
D) Lamellar tearing at the root of a weld joint - ANSWERS-D) Lamellar
tearing at the root of a weld joint
In steels, a small grain size will:
A) Change the atomic arrangement from FCC to BCC
B) Decrease the strength and toughness
C) Increase the strength and toughness
D) Decrease the carbon content
E) Affect the chemical analysis - ANSWERS-C) Increase the strength
and toughness
Which of the following processes produce the most of the worlds steel?
A) Electric furnace
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, CWB 2 ALL MODULE LATEST
EXAMS
B) Blast furnace
C) Open hearth furnace
D) Basic oxygen furnace
E) None of the above - ANSWERS-D) Basic oxygen furnace
At what point does the carbon content indicate that the material is no
longer steel but cast iron?
A) Beyond 1.7%
B) Beyond 17%
C) Beyond 7.1%
D) Beyond 0.71%
E) Beyond 0.17% - ANSWERS-A) Beyond 1.7%
One of the causes of hot shortness in steel is the presence of:
A) High Cobalt
B) High Chromium
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4
EXAMS
When using an AC yoke, two test are done with the angle of the yoke at
90° to each other. Why?
A) To ensure good magnetic contact is maintained
B) Because discontinuities lying parallel to the line between the poles of
the yoke are not readily detected
C) To remove residual magnetism from the first test
D) Because discontinuities lying normal to the line between the poles of
the yoke are not readily detected
E) Two test are not necessary when using AC - ANSWERS-B) Because
discontinuities lying parallel to the line between the poles of the yoke
are not readily detected
What is the depth capability for AC magnetic particle methods?
A) 3mm
B) 3mm for AC prods only
C) 6mm in non-ferrous metals
D) 6mm in steel
END OF
PAGE
1
, CWB 2 ALL MODULE LATEST
EXAMS
E) No effective depth capability - ANSWERS-E) No effective depth
capability
Which of the following statements is true?
A) The eddy current method is based on detecting the flux leakage
around the discontinuity using a Fall detector
B) The eddy current method is based on detecting changes in the
inductive reactance of a coil due to disturbance of the eddy current by a
discontinuity and can be used on non-ferrous metals
C) The eddy current method is based on detecting changes to the
inductive reactance of a coil due to disturbance of the eddy current and
can only be used on ferromagnetic metals
D) The eddy current method is based on measuring the change in
voltage across a discontinuity when an eddy current flows
E) The eddy current method normally uses direct current to increase
depth capability - ANSWERS-B) The eddy current method is based on
detecting changes in the inductive reactance of a coil due to disturbance
of the eddy current by a discontinuity and can be used on non-ferrous
metals
Which of the following defects cannot be detected with LPI?
END OF
PAGE
2
, CWB 2 ALL MODULE LATEST
EXAMS
A) Fine tight surface cracks
B) Shallow and broad cracks
C) Incomplete fusion between weld and base metal open to surface
D) Lamellar tearing at the root of a weld joint - ANSWERS-D) Lamellar
tearing at the root of a weld joint
In steels, a small grain size will:
A) Change the atomic arrangement from FCC to BCC
B) Decrease the strength and toughness
C) Increase the strength and toughness
D) Decrease the carbon content
E) Affect the chemical analysis - ANSWERS-C) Increase the strength
and toughness
Which of the following processes produce the most of the worlds steel?
A) Electric furnace
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PAGE
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, CWB 2 ALL MODULE LATEST
EXAMS
B) Blast furnace
C) Open hearth furnace
D) Basic oxygen furnace
E) None of the above - ANSWERS-D) Basic oxygen furnace
At what point does the carbon content indicate that the material is no
longer steel but cast iron?
A) Beyond 1.7%
B) Beyond 17%
C) Beyond 7.1%
D) Beyond 0.71%
E) Beyond 0.17% - ANSWERS-A) Beyond 1.7%
One of the causes of hot shortness in steel is the presence of:
A) High Cobalt
B) High Chromium
END OF
PAGE
4
