mt -gen

PENETRANT TESTING - LEVEL II - GENERAL - II

MAGNETIC PARTICLE TESTING LEVEL IIQuestion : GENERAL FINAL EXAMINATION------------------------------------------------------------------------------------------------------------

1.0 Magnetic particle testing is for detecting the discontinuitiesa) Only on the surface

b) Surface as well as sub surface c) On non magnetic material d) Both a &c 2.0 Which of the following is connected with bar magnet?a) Normally bar magnets have two poles

b) The field totally external

c) Flux lines within the magnet will flow from north to south

d) No external field outside the magnet

3.0 which of the following can be magnetized?

a) Iron

b) Nickel

c) Cobalt

d) All of the above

4.0 Magnetic flux lines which are parallel to the discontinuity produces

a) Strong indication

b) Fuzzy indication

c) No indication

d) Weak indication

5.0 What is the maximum current required to magnetize the part 10 long and 2 dia by solenoid coil method having 5 turns?a) 1400Amps

b) 1000Amps

c) 2000Amps

d) 700Amps

6.0 The field produced in a hollow magnetic cylinder pipe of dia 80mm with a central conductor of copper material will be

a) Maximum at the outside surface of the pipe

b) Minimum at 1/4th distance of the pie from the top surface

c) Maximum at the inside surface of the pipe

d) None of the above

7.0 Demagnetization of the specimen can be effectively and easily carried out if the specimen was already magnetized previously by

a) By longitudinal magnetization

b) By circular magnetization

c) By vector magnetization

d) By polarized magnetization

8.0 After carrying out magnetic particle testing on the part which requires heat treatment for inducing better material properties, the examined part shall be demagnetizeda) Trueb) Falsec) Partially can be done

d) None of the above9.0 The wide loop of hysteresis curve of a material indicates

a) Can be easily magnetized

b) Not makes a good magnet

c) low permeability

d) low retentivity 10.0 The best companied method of detecting discontinuities which are nearer to the surface

a) AC + wet

b) DC+ dry

c) DC + wet

d) HWDC+ dry

11.0 What is the minimum current in amperes required when testing by prod method for thickness of specimen 1/2 and the distance between prod is 6

a) 700Amps

b) 540Amps

c) 1200Amps

d) 110Amps

12.0 For effective coil magnetization, the L/D ratio of the specimen inside the coil shall be

a) Greater than 2

b) Less than 1

c) Equal to 2


13.0 The purpose of filter for mercury arc vapour lamp in carrying out Fluorescent magnetic particle testa) Supplying light of correct wavelength to cause fluorescence on material

b) To pass all the wavelength of light falling on the specimen

c) To increase the intensity of light falling on the specimen


14.0 Circumferential field magnetization can be produced by

a) Solenoid coil method

b) Prod method

c) yoke method

d) Vector method

15.0 The instrument that is used for measuring the effectiveness of demagnetization

a) Flux meter

b) Field indicator

c) Lacto meter

d) Hydrometer

16.0 The accumulation of particles collected and held on the part surface by the leakage of magnetic field is called as

a) Discontinuity

b) Defect

c) An indication

d) Magnetic writting17.0 In wet particle method to achieve the required test sensitivity, concentration of the bath shall be used by

a) Drop test

b) Visual examination under black light

c) Settling test

d) Visibility test18.0 When shall Ferro magnetic particles be applied while doing magnetization by residual method a) Before the magnetization

b) During the magnetization

c) After the magnetization

d) None of the above19.0 Which is the best for detecting the discontinuity with high sensitivity in Ferro magnetic materialsa) Residual method

b) Continuous method

c) Vibration method


20.0 The most convenient and widely used method of preserving the indication is

a) Transparent tape transfer technique

b) Photographic technique

c) Lacquer transfer technique


21.0 While carrying out DC magnetization, the discontinuity is revealed on the surface and it is repeated on the same with AC, it is not able to show the indication. This may be due to

a) The defects appearing on the surface

b) The defect located at the depth of 3 to 4mm from the top surface

c) Indication may be false d) None of the above

22.0 Sub surface indication will appear in Magnetic particle testinga) Less distinct ,diffused and fuzzy pattern having width

b) Sharp discontinuity & tightly held particle indication

c) Narrow round & more or less elliptical pattern


23.0 Before using yoke method, the intensity of magnetic field produced between the pole pieces, is calibrated by means ofa) Amperes

b) Amperes turns

c) Lifting power by using known standard weight

d) Not necessary to check the field adequacy

24.0 Magnetic field adequacy as well as the desired direction of magnetic field can be checked by

a) Field indicator

b) Pie gauge

c) Artificial flaw shim

d) All of the above

25.0 The system performance of horizontal units by dry and wet methods using a ring with holes at various depth and a conductor at the centre, is adapted by what type of method and magnetization

a) Yoke method & Longitudinal magnetization

b) Central conductor & circular magnetizationc) Prod method & circular magnetization

d) Solenoid coil & longitudinal magnetization26.0 Which one of the following is a cause for non relevant indication?a) Lack of fusionb) Change of thickness

c) Drilled hole near the surface

d) Both b& c

27.0 The type of defect that will occur in casting solidification caused by non uniform cooling as well as change of thickness resulting in rupture of the surface of the metal

a) Shrinkage

b) Hot tear

c) Porosity

d) Cold shut

28.0 The name of the sub surface defect that will occur in the manufacture of piping and tubing is a) cold shut

b) Stringer

c) Lack of fusion

d) Piping

29.0 One of the false indication that will occur during the MT of butt welds of plates and pipes by prod method isa) Lack of penetration

b) Excess penetration

c) Magnetic writing

d) Blow hole

30.0 If one inch and two inch dia of bars are magnetized by passing the same current individually through them, the magnetic field will be

a) Same for both

b) Stronger in the two inch dia bar

c) Weaker in the one inch dia bar

d) Stronger in the one inch dia bar

31.0 A one inch thick butt welded mild steel was welded using metal arc process. On testing with prod method with dry powder star shaped indication appearing in the middle of the weld width is most likely due to

a) Crater cracks

b) Micro cracks

c) Transverse crack

d) Heat treatment cracks

32.0 When a tubular part is magnetized by using central conductor method the value of the magnetic field on the internal wall is

a) Equal to that measured external surface

b) Maximum

c) Greater than measured on external surface

d) Equal to half of that measured that external surface

33.0 Direct current can be obtain from

a) Batteries

b) Rectified AC

c) Generators

d) All of the above

34.0 A slender loop of hysteresis curve indicate

a) High coercive force

b) High retentivity

c) High permeabilityd) Not make an excellent permanent magnet

35.0 MT is not a reliable method of detecting

a) Forging laps

b) Surface cracks

c) Seams in pipes

d) Deep seated cavities

36.0 During the testing of Magnetic particle testing for finding sub surface discontinuities. 6mm length crack appeared an austenitic stainless steel weld of thick 25mm

a) True

b) False

c) More information required

d) % of chromium shall be increased37.0 Which one of the following indication of the discontinuity is most deterimental in deciding the acceptability of the material?a) A linear crack of length 8mm at the surface of the specimen

b) Slag line of the length 20mm at a depth of 3mm from the surface

c) Porosities of dia 4mm, 6mm, 2mm on the weld surface with a distance between 2mm and 3mm respectively

d) Lack of fusion of length 3mm at 5mm depth

38.0 Which one of the following elements is not among the those strongly attracted by magnetism?

a) Austenitic stainless steel

b) Copper sulphate

c) Goldd) All of the above

39.0 The advantages of the permanent magnetic are

a) Needs no electric power

b) Readily portable

c) Relative in expensive

d) All of the above

40.0 A weld was inspected after the rework. Some odd hazy indications were seen in cluster at various locations along the weld in the parent material that seemed to have no connection with the weld. What could be the significance of these indications

a) Non relevant residual field left by the original test that had used prod

b) Magnetic writing with no significance

c) Cracks in the parent metal

d) Arc tracks with no significance

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