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NDT MCQ Unit 2.doc
- 1. KARPAGAM INSTITUTE OFTECHNOLOGY COIMBATORE - 105 DEPARTMENT OF MECHANICAL ENGINEERING Academic Year: 2020 - 2021 (ODD Semester) MCQ Test UNIT II Subject Code & Name : ME8097 –Non Destructive Testing and Evaluation PART A 1 In liquid Penetrant testing method the Penetrant is drawn into the cracks by ______ a) Viscous action b) Capillary action c) Applying pressure d) None of the above 2 In Liquid Penetrant testing is applicable to any complex shapes a) True b) False 3 In liquid Penetrant testing method it can detect flaws that are open to the surface a) True b) False 4 Penetrant is applied by a) Dipping b) Spraying c) Brushing d) All of the above 5 _________ is applied to drawn the Penetrant liquid from the discontinuity a) Developer b) Alkaline solution c) Non Alkaline solution d) None of the above 6 ________ is the period of time from when the Penetrant is applied to the surface until it is removed a) Dwell time b) Penetration time c) Both a and b d) None of the above 7 Removal of excess Penetrant is done by a) Water washing b) Post emulsifying
- 2. c)Solvent removing d) Allof the above 8 ________ is the time it takes the application of the developer until the actual evaluation commences a) Dwell time b) Penetration time c) Developing time d) None of the above 9 _________ are usually green in colour and they contain a dye or several dyes that fluoresce a) Visible Penetrant b) Non visible Penetrant c) Fluoresce Penetrant d) None of the above 10 Penetrant material to be effective, when the contact angle should be a) Small as possible b) Large as possible c) Neither Small and large d) None of the above 11 Contact angle for most liquid Penetrant is very close to a) 45.52° b) 50.63° c) 0° d) 90° 12 __________ is a measure of the energy required to form a unit area of new surface at the interface. a) Surface energy b) Surface tension c) Both a and b d) None of the above 13 Viscosity of a liquid is a measure of its a) Internal energy to flow b) External energy to flow c) External resistance to flow d) Internal resistance to flow 14 ___________ is the temperature at which sufficient flammable vapor is given off a liquid to form an explosive mixture in air over the liquid. a) Flash point b) Fire point c) Ignition point d) None of the above 15 The flash point does not affect the performance of Penetrant a) True b) False 16 __________ developers are white, fluffy that can be applied to a thoroughly dry surface in a number of ways
- 3. a) Dry powder b)Water soluble c) Water suspendable d) None of the above 17 __________ developers consist of a group of chemical that are dissolved in water and form a developer layer when the water is evaporated away a) Dry powder b) Water soluble c) Water suspendable d) None of the above 18 __________ developers consist of insolvable particles suspended in water a) Dry powder b) Water soluble c) Water suspendable d) None of the above 19 ________ developers suspend the developer in a volatile solvent a) Dry powder b) Water soluble c) Water suspendable d) Nonaqueous 20 Water washable Penetrant is also known as a) Emulsifying Penetrant b) Self Emulsifying Penetrant c) Both a and b d) None of the above 21 ___________ is a NDT to locate surface and sub surface discontinuities in parts made by ferromagnetic materials a) Eddy current testing b) Magnetic particle testing c) Ultrasonic testing d) None of the above 22 Ferromagnetic materials are a) Iron b) Steel c) Cobalt d) All of the above 23 In order to eliminate residual magnetism we have to do a) Magnetization b) De Magnetization c) Both a and b d) None of the above 24 In magnetic particle testing method to inspect cylindrical objects, the current required is given by a) I=20D b) I=30D c) I=40D
- 4. d) I=50D 25 If analternating magnetic field is applied to the material its magnetization will trace out the ___________ a) Magnetic force line b) Saturation point c) Hysteresis loop d) None of the above 26 For how long is a Penetrant allowed to soak in cracks? a) 5 to 15 minutes b) 10 to 30 minutes c) 15 to 35 minutes d) 20 to 40 minutes 27 Penetrants of which color are not used? a) Red b) Blue c) Green d) Yellow 28 Which of the following is not a method of pre-cleaning? a) Solvent b) Acid blasting c) Vapor degreasing d) Media blasting 29 Only ultraviolet light is used in dye Penetrant test. a) True b) False 30 LPI can’t be used on __________ specimen. a) Large b) Simple c) Complex d) Internally defected 31 Which order is right for LPI? a) Penetrant apply, development, inspection, surface preparation b) Surface preparation, penetrant apply, development, inspection c) Penetrant apply, development, surface preparation, inspection d) Development, surface preparation, penetrant apply, inspection 32 What is general dwell time? a) 20 seconds b) 2 minutes c) 20 minutes d) 2 hours 33 __________ increases the visibility of the flaw in LPI. a) Developer b) Penetrant c) Benzene d) Spirit
- 5. 34 Small components aredipped in penetrant. a) True b) False 35 Which materials can be tested by MPI? a) Magnetic b) Non-magnetic c) Paramagnetic d) Ferromagnetic PART B 1 What is Curie point for most of the ferrous magnetic materials? a) 550˚C b) 760˚C c) 910˚C d) 1133˚C 2 The minimum width of crack, which can be inspected by MPI, is _________ a) 1nm b) 1µm c) 10µm d) 1mm 3 What is the advantage of using DC in MPI? a) Battery maintenance b) Demagnetize easy c) Variable voltage supply d) Subsurface detection 4 Plain carbon steels are applied with magnetic particles by a residual method? a) True b) False 5 Which of the following defects are not detected by magnetic particle inspection? a) Surface cracks b) Quenching cracks c) Thermal cracks d) Fatigue cracks 6 Which of the following materials can be tested using magnetic particle testing? a) Brass b) Steel c) Bronze d) Solder 7 Which current is helpful in detecting sub surface discontinuities? a) High frequency AC b) Low frequency AC c) Full wave DC d) Half wave DC 8 Magnetic particles with fluorescent coating are seen under which light? a) White light b) Infrared light
- 6. c) Black light d)Ultraviolet light 9 What is the size range of dry particle powder? a) 5 to 170 micrometers b) 15 to 185 micrometers c) 45 to 215 micrometers d) 65 to 250 micrometers 10 Magnetic field lines travel from north to south. a) True b) False 11 Which among the following is the last step in magnetic particle test method? a) observation and inspection b) circular magnetization c) demagnetization d) Magnetization 12 A longitudinal magnetic field has magnetic lines of force that run a) Parallel to the long axis of the part b) 90 degrees to the long axis of the part c) Transverse to the long axis of the part d) Opposite the waveform of the magnetic particle machine used 13 The magnetic flux density that remains in the material when the magnetizing force is zero is called a) Retentivity b) Residual magnetism c) Coercive force d) Permeability 14 A material is considered demagnetized when: a) Its residual magnetic field measures less than 5 gauss b) It no longer produces an indication c) It's no longer attracted to a magnet d) Its residual magnetic field measures less than 3 gauss 15 Magnetic particle inspection has several advantages over liquid penetrant inspection which include: a) Components with thin coatings can be inspected without removing the coating b) Components can be inspected more rapidly c) The technique is more portable d) Both a and B