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cwb exam questions > 1 > Flashcards

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1
Q
  1. Which of the following refers to a welder test where a pipe assembly is placed vertically and the joint welded in the horizontal position without rotating the assembly?
    a) 1G
    b) 2G
    c) 3G
    d) 5G
    e) 6G
A

b) 2G

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2
Q

the correct penetrameter thickness for 2% sensitivity when radiographing a weldment 1.25 inches in thickness.
a) 0.012 in.
b) 0.015 in.
c) 0.025 in.
d) 0.030 in.

A

c) 0.025 in.

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3
Q
  1. The ultrasonic transducer is pressed against the plate of a welded joint. The sound travels longitudinally through the plate to the opposite side. The signal seen on the UT screen that comes from this opposite side of the plate:

a) Is the initial pulse signal.
b) Is the back reflection signal.
c) Is the front reflection signal.
d) Must be equal in amplitude to any defect signal.
e) Cannot be used for establishing the thickness of the material under test.

A

b) Is the back reflection signal.

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4
Q
  1. When applying a post-emulsifiable excess penetrant removal process, the excess penetrant is removed by:
    a) Wiping with a dry cloth.
    b) Rinsing with water.
    c) Applying an emulsifier and then rinsing with water.
    d) Using a solvent remover.
A

c) Applying an emulsifier and then rinsing with water.

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5
Q
  1. What is the orientation of the magnetic field at the center of a circular coil carrying current?

a) The direction of the magnetic field in the center of a coil is parallel to the axis of the coil.
b) The direction of the magnetic field in the center of a coil is perpendicular to the axis of the coil.
c) The magnetic field at the center of a coil is radial, pointing outward from the coil’s center.
d) There is no magnetic field at the center of a coil.

A

a) The direction of the magnetic field in the center of a coil is parallel to the axis of the coil.

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6
Q
  1. How is a magnetic particle indication formed around a crack in a piece of steel?

a) A flux is induced in the steel parallel to the crack.
b) An electric current is made to flow along the crack.
c) The part is placed inside a coil with the crack parallel to the axis of the coil.
d) An induced flux transverse to the crack allows poles to form at the crack faces.
e) All external fields are disturbed by the presence of the crack.

A

d) An induced flux transverse to the crack allows poles to form at the crack faces.

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7
Q
  1. Select the correct statement. Which of the following techniques is most likely to detect a longitudinal surface crack lying along the fusion boundary of a weld?

a) A DC yoke should be placed along the weld to detect fusion boundary cracks.
b) An AC yoke should be placed along the weld to detect fusion boundary cracks.
c) An AC yoke should be placed across the weld to detect fusion boundary cracks.
d) The prods should be placed across the weld to detect fusion boundary cracks.
e) The part placed inside a coil with the weld parallel to the coil axis.

A

c) An AC yoke should be placed across the weld to detect fusion boundary cracks.

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8
Q
  1. What is the effect of increasing the contact tip-to-work distance (CTWD) on the deposition rate in submerged arc welding (SAW)?
    a) Increasing the CTWD has no effect on the deposition rate.
    b) Increasing the CTWD decreases the deposition rate due to reduced arc energy and penetration.
    c) Increasing the CTWD increases the deposition rate due to resistance heating in the electrode extension.
    d) Increasing the CTWD increases the deposition rate until a certain point, after which it causes the arc to wander unpredictably.
A

c) Increasing the CTWD increases the deposition rate due to resistance heating in the electrode extension.

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9
Q
  1. Which of the following statements is correct regarding the storage and handling of cellulosic and low-hydrogen electrodes?
    a) Both cellulosic and low-hydrogen electrodes should be stored in holding ovens to prevent moisture absorption.
    b) Cellulosic electrodes should be stored in holding ovens, while low-hydrogen electrodes should be kept in their original packaging.
    c) Low-hydrogen electrodes should be stored in holding ovens to maintain low moisture content, while cellulosic electrodes should not be placed in ovens but stored in their original containers.
    d) Both cellulosic and low-hydrogen electrodes should be re-baked regularly to ensure optimal performance.
A

c) Low-hydrogen electrodes should be stored in holding ovens to maintain low moisture content, while cellulosic electrodes should not be placed in ovens but stored in their original containers.

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10
Q
  1. Which shielding gas does GMAW use for spray transfer?

a) 100% Carbon Dioxide (CO2)
b) 100% Helium (He)
c) A mixture of Argon (Ar) and 1%-5% Oxygen (O2)
d) A mixture of Argon (Ar) and 5% Carbon Dioxide (CO2)

A

d) A mixture of Argon (Ar) and 5% Carbon Dioxide (CO2)

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11
Q
  1. A dark, narrow area about 2-3 mm wide appears on a radiograph of a double vee groove weld along the edge of the area representing the weld. What does this dark area most likely represent?

a) Lack of side wall fusion
b) Incomplete penetration
c) Undercut
d) Slag entrapment
e) Weld metal crack

A

c) Undercut

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12
Q
  1. When radiographing a pipe with the source inside, give one reason why the source might not be placed at the center.

a) The source is always placed at the center.
b) To increase the source-to-film distance
c) To reduce exposure times
d) To reduce the number of shots required
e) The source is never placed inside.

A

b) To increase the source-to-film distance

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13
Q
  1. What happens to a sound wave when it travels into a different media?

a) The frequency changes.
b) The wavelength changes.
c) The decibels increase.
d) The waves are refracted.

A

d) The waves are refracted.

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14
Q
  1. What is the typical frequency for ultrasonic testing of welds on steel?

a) 2.25 Khz.
b) 2.25 Mhz.
c) 25.0 Khz.
d) 25.0 Mhz.
e) 225 Hz.

A

b) 2.25 Mhz.

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15
Q
  1. The yield strength (YS) is given by:

a) 80% of maximum load divided by the cross-sectional area.
b) The load at the breaking point is divided by the cross-sectional area.
c) The yield point load is divided by the cross-sectional area.
d) The maximum load divided by the cross-sectional area.

A

c) The yield point load is divided by the cross-sectional area.

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16
Q
  1. The ability of a liquid to penetrate a narrow opening depends on the phenomenon of:

a) Fluorescence.
b) Capillary action.
c) Density.
d) Viscosity.
e) Lipophilic.

A

b) Capillary action.

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17
Q
  1. In Steels, a small grain size will:

a) Changes 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.

A

c) Increase the strength and toughness.

18
Q
  1. 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%

A

a) Beyond 1.7%

19
Q
  1. One of the causes of hot shortness in steel is the presence of:

a) High Cobalt
b) High Chromium
c) High Manganese
d) High Sulphur
e) High Silicon

A

d) High Sulphur

20
Q
  1. Which of the following is an example of an indication not associated with a discontinuity in a welded component?
    a) A crack detected at the toe of the weld.
    b) A shadow indication from a tight gap between a backing bar and the plate.
    c) Porosity found within the weld bead.
    d) Slag inclusions visible on the surface of the weld.
    e) Lack of fusion along the weld interface
A

b) A shadow indication from a tight gap between a backing bar and the plate.

21
Q
  1. MP can not be used on what types of materials?

a) Non-magnetic materials
b) Austenitic Stainless Steel
c) Aluminum
d) Copper
e) Plastic
f) Non-ferrous Metals
g) All the above

A

g) All the above

22
Q
  1. How do you measure the size of a flare-groove weld?

a) Leg length.
b) Face width.
c) Depth of bevel.
d) Length of the weld.

A

b) Face width.

23
Q
  1. CSA G-40.21M designation, type 350WT steel specifies weldable steel?

a) Where low temperature toughness is a prime consideration.
b) Where high temperature deafness is a prime concern.
c) That had been quenched and tempered.
d) That has not been quenched but has been tempered.

A

a) Where low temperature toughness is a prime consideration.

24
Q
  1. A ____ is raised portion on the surface caused by a gas bubble?

a) Pit.
b) Scab.
c) Blister.
d) Seam.

A

c) Blister.

25
Q
  1. Ultrasonic inspection is typically done by coupling the transducer to the surface with?

a) The transducer manufacturer or equivalent device.
b) A glycerin type gel.
c) A cushion of air.
d) Any liquid containing no more than 1% fine suspended particles.

A

b) A glycerin type gel.

26
Q
  1. If you’re using a tape to measure in a cold environment you should?

a) Allow your tape time to adjust to the temperature.
b) Take the measurement with a warm tape for accuracy.
c) Adjust your measurement to allow for the temperature difference.
d) Use the coefficient of thermal expansion to adjust your measurement.

A

a) Allow your tape time to adjust to the temperature.

27
Q
  1. During the performance of a tension test, the yield strength is commonly determined to be.?

a) The point in the loading where the elongation of the material is noticed.
b) The stress of which the material exhibits a specified deviation from proportionality of stress and strain.
c) The strength of which the testing machine will first yield an indicator reading.
d) Higher than the tensile strength.

A

b) The stress of which the material exhibits a specified deviation from proportionality of stress and strain.

28
Q
  1. Welding standards and codes often cover a situation in which the joint geometry may cause centerline cracking in the weld throat. Which one of the following statements is correct for a butt weld between two plates?

a) The root opening shall be greater than the joint thickness.
b) The weld face shall be greater than the joint thickness.
c) The joint should be a vee type whenever possible, with zero root opening.
d) For any weld bead, the weld face of the bead should not be less than the weld bead depth.

A

d) For any weld bead, the weld face of the bead should not be less than the weld bead depth.

29
Q
  1. When conducting a tension test, the rate of loading up to the yield point is usually limited to some maximum value, what is the reason for this?

a) Because a fast loading rate might lower the UTS.
b) Because a fast loading rate might increase the yield stress.
c) To prevent the specimen from breaking before reaching the UTS.
d) To allow for readings to be taken.

A

b) Because a fast loading rate might increase the yield stress.

30
Q
  1. Which of the following is a true statement?

a) A post weld relief heat treatment requires a higher temperature than an annealing treatment.
b) A post weld stress relief heat treatment requires a lower temperature than an annealing treatment.
c) Welded pipe assemblies must be heated all over for a post weld heat treatment.
d) Post wed heat treatment does not interact with cold worked zones.

A

b) A post weld stress relief heat treatment requires a lower temperature than an annealing treatment.

31
Q
  1. Which of the following radiation protection equipment does not give you immediate results?

a) Audible alarms.
b) Thermo luminescence dosimeters
c) Direct reading dosimeters
d) Survey meters.

A

b) Thermo luminescence dosimeters

32
Q
  1. The most common elements added to steel for deoxidation during the steel making process are?

a) Sulphur and phosphorus
b) Aluminum, silicon, and manganese
c) Titanium.
d) Boron.

A

b) Aluminum, silicon, and manganese

33
Q
  1. Which of the following CS G40-21M steels will require the most stringent control of the welding procedure?

a) 400w
b) 350WT
c) 200Q
d) 230G

A

b) 350WT

34
Q
  1. If more than 0.8% carbon is added to iron?

a) The result steel can no longer be forged.
b) The resulting material is called cast iron.
c) The resulting material will contain cementite and pearlite.
d) The resulting material will contain martensite and pearlite.

A

c) The resulting material will contain cementite and pearlite.

35
Q
  1. The international or specified curvature of a beam is called?

a) Camber.
b) Caster.
c) Arch.
d) Chamfer.

A

a) Camber.

36
Q
  1. Vacuum degassing is a method by which the following gases are intentionally removed by exposing the molten steel to a low pressure?

a) Hydrogen and oxygen.
b) Nitrogen and Hydrogen
c) Nitrogen and oxygen.
d) Oxygen and carbon.

A

b) Nitrogen and Hydrogen

37
Q
  1. A gas that has become widely used for GMAW of steel in its pure form because it allows higher welding speed, better penetration, good mechanical properties and costs less than argon is?

a) CO2.
b) Helium.
c) Hydrogen.
d) CO.

A

a) CO2.

38
Q
  1. Which other element together with nickel is used in stainless steels?

a) Carbon.
b) Sulphur.
c) Chromium.
d) Boron.

A

c) Chromium.

39
Q
  1. The material property associated with the dimensions of a material when its temperature is changed by heating or cooling is the?

a) Thermal conductivity.
b) Co-efficient of thermal expansion.
c) Co-efficient of thermal conductivity.
d) Co-efficient of thermal extension.

A

b) Co-efficient of thermal expansion.

40
Q
A

cwb exam questions (1 decks)

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