CSWIP 3.1 Multiple Choice Paper 3

Answers don’t show in the following questions; we separated to another link. You should spend your time and focus to read, answer the questions correctly, then it is the time to review your results.

Note 1. Don’t remember the questions and answers.
Note 2. Should be used exclusion principle to choose the best answer.

Rolling down to the end page to get the answer link :arrow_double_down:

  1. Charpy impact tests allowing a flat but rough surface after the completed test, this would indicate which type of failure?
  • Fatigue
  • Ductile
  • Fatigue to ductile
  • Brittle
  1. A butt weld has been made by MMA in a 50mm thick impact tested steel plate. The welding electrode used was a basic type, 5mm diameter. The measured welding parameters for one of the runs was 220 amps, 21 volts, using DC+ve polarity and a ROL of 270mm per minute. What would be the arc energy?
  • Insufficient information given to calculate the arc energy
  • 1.54 kJ/mm
  • 1.026 kJ/mm
  • 2.82 kJ/mm
  1. When using DC+ve polarity, what is the typical OCV?
  • 20V
  • 50V
  • 90V
  • 240V
  1. When MMA welding what will be the effect on the weld if the power source was change from DC+ve to AC?
  • None
  • It would have been easier for the welder to strike the arc
  • It would be slightly increase the depth of penetration
  • It would slightly decrease the depth of penetration
  1. What would the effect be if the polarity were changed from DC+ve to DC-ve?
  • None
  • Greater deposition rate
  • Greater penetration
  • Less deposition rate
  1. Would you consider which of the following processes uses a flat characteristic?
  • 131
  • 111
  • 141
  • 121 using greater than 1000 amps
  1. When welding medium carbon steel plates over 50mm in thickness for basic electrodes require any pre-treatment before use?
  • None if they were in a vacuum pack
  • None if they were used in a factory
  • Heat to 500 degree C for 2 hours is used outside
  • Baked at 150 degree C for 4 hours prior to use
  1. Which of the following defects are not associated with MMA (SMAW) welding process?
  • Isolated pores
  • Lack of fusion
  • Undercut
  • Tungsten inclusions
  1. Slag line found in MMA welds are usually associated with:
  • The voltage being too low
  • The open circuit current being too hight
  • Improper cleaning between weld runs
  • Low open circuit voltage
  1. With which of the following NDE processes is it possible to detect both surface and slight sub-surface detect up to 2mm below the surface.
  • Visual
  • Dye penetration
  • Magnetic particle using DC
  • Magnetic particle using AC
  1. For MPI using the prods method, which of the following statements is true:
  • It may cause arc damaged on the specimen material surface
  • It requires fewer operators therefore is easier
  • It can be used with ferrite and non-ferrite materials
  • It is quicker than using a yoke type electromagnet
  1. With the DPI method of inspection, after the contact time has elapsed the dye should be removed by:
  • Spraying the surface with the remover till all dye has gone then wipe with a clean cloth.
  • Spraying with the developer the wiping with a cloth.
  • Wipe clean, using a clean cloth soaked in the solvent remover.
  • It does not matter how it is done as long as all traces of dye are removed.
  1. Which of the following commonly used radioactive isotopes has the longest half life?
  • Iridium 192
  • Cobalt 60
  • Thulium 170
  • Ytterbium 169
  1. A 300mm diameter pipe, 8mm wall thickness is to be radiographed using the double wall single image technique. The source to be used is iridium-192. Which if the following statement is true?
  • It should not be done as the thickness is below that recommended
  • It would be better to use a cobalt 60 source in the instance
  • There are not problem with the technique
  • Only the double wall, double image technique should be used with iridium
  1. Half life is a term used to describe
  • The penetrating ability a gamma source
  • Half the total time a gamma source will be useful
  • The time taken for the gamma source to reduce its strength be half
  • The rate of decay of an X-ray tube
  1. What is the greatest disadvantage of radiographic inspection?
  • Its inability to size defect accurately
  • The physical size of the equipment
  • The skill level of the inspectors
  • The harmful effects of ionizing radiation
  1. Which of the following defects are unlikely to be detected by normal radiographic techniques?
  • Intergranular corrosion cracking
  • Porosity
  • Slag
  • Lack of penetration
  1. For ultrasonic testing, which of the following statements is true?
  • It is easy to identify all defects
  • The equipment should be calibrated before use
  • The equipment can not be automated
  • Sound waves will not travel through copper
  1. Hydrogen cracking is considered a cold crack as it will not form till the weldment cools to below:
  • 500 Deg C
  • 300 Deg C
  • 300 Deg F
  • 730 Deg C
  1. Inspection for hydrogen cracking is often specified to be done between 48 to 75 hours after completion of the weld, this is because?
  • The stress level will have reduced by then
  • Applying a stress relief heat treatment after welding
  • Avoiding stress concentrations
  • It is the maximum time it takes for all the H2 to diffuse out of the weld
  1. At what level is H2 considered to be more critical in cracking?
  • Less than 5ml per 100g of weld metal deposited
  • Between 5 and 10ml per 100g of weld metal deposited
  • Between 10 and 15ml per 100g of weld metal deposited
  • Over 15ml per 100g of weld metal deposited
  1. Which of the following electrode types would produce the highest levels of hydrogen?
  • Basic electrode when baked correctly
  • Cellulose in a sealed tin
  • Rutile
  • Heavy rutile
  1. Assuming the same materials and welding procedure were used, which of the following situation would require the highest preheat?
  • Butt weld in 30mm plate
  • Tee joint but weld in 20mm plate
  • Tee joint fillet weld in 20mm plate
  • Cruciform joint in 20mm plate
  1. In general term which is the following would require the highest preheat if all other factor were the same as per ISO BS EN 1011?
  • MMA weld with cellulose electrodes
  • MMA weld with rutile electrodes
  • MMA weld with basic electrodes
  • MAG weld with solid wire
  1. Which of the following microstructures is critical to the likely formation of hydrogen cracks?
  • Austenite
  • Ferrite
  • Pearlite
  • Martensitic
  1. Basic electrodes are often sold vacuum packed. The reason is:
  • They have been packed at the manufacturers at a hydrogen level less than 5ml per 100g of weld metal deposited
  • They are mass produced which makes there electrodes cheap
  • They require less baking time after removal from the packet
  • They are formulated that once open they will pick up no more moisture
  1. On inspecting a completed weld which has charpy impact requirements some small areas of undercut have been found. The welder says he can quickly put this right by depositing a thin narrow bead along the undercut. In the situation would you?
  • Agree to go ahead with no preheat as the weld is so small
  • Agree to go ahead with the same preheat as the original weld
  • Agree to go ahead with a preheat 50 degree C below original
  • Only allow the welder to cosmetically blend out the undercut
  1. With regards to Lamellar tearing, a buttering layer will:
  • Improve ductility
  • Disperse heat
  • Improve toughness
  • Improve hardness
  1. Lamellar tearing can be detected by which of the following NDE methods?
  • Radiography
  • Ultrasonic
  • Eddy current
  • MPI using AC
  1. A fatigue fracture can be identified (from examination of the fracture …):
  • The presence of beach marks
  • The presence of plastic deformation
  • Being rough and torn
  • Being flat and rough

See suggestion answer here.

NOTE : You have to signed-up to become a member prior to view the answers here.

4 Likes

Question 23. I think the answer is D because preheat depend on the combine thickness. Please see the pic below:
image

1 Like

and according with EN 1011-2 C2.4

1 Like

Yes, Question 23: correct answer D.
See EN 1011-2 2004, Section 2.4 - Combined thickness

Crossiform joint d= d1 + d2 + d3 + d4
BW d= d1 + d2
FW d= d1 + d2 + d3

1 Like

D. Should be correct 4x20mm, Tee is 3x25mm

Answer should be A? Because Iridium-192 should use for thickness from 10mm

2 Likes

Best answer should be “C”. Due to using method DWSI, thickness of weld product shall be t = 2x8 = 16 mm.

2 Likes