Metallurgical Testing And Inspection MCQ

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• The technique (s) which can be used for the direct observation of dislocations is (are)
  ক

  scanning electron microscopy

  খ

  transmission electron microscopy

  গ

  field-ion microscopy

  ঘ

  electron probe micro analysis
• Match the NDT method in Group 1 with the items in Group 2.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group 1</strong></td> <td><strong>Group 2</strong></td> </tr> <tr> <td>P. Ultrasonic testing</td> <td>1. Core shift in castings</td> </tr> <tr> <td>Q. Dye penetrant testing</td> <td>2. Surface defects in HSLA welds</td> </tr> <tr> <td>R. Magnetic particle inspection</td> <td>3. Fillet welds</td> </tr> <tr> <td>S. Radiography</td> <td>4. Hot crack in austenitic SS welds</td> </tr></table> P-3, Q-2, R-4, S-1

  খ

  P-3, Q-4, R-2, S-1

  গ

  P-1, Q-4, R-2, S-3

  ঘ

  P-1, Q-2, R-3, S-4
• The boundary between slip and unslip plane is called
  ক

  dislocation

  খ

  point defect

  গ

  surface defect

  ঘ

  volume defect
• A penetrant process in which excess penetrant is removed with an organic solvent is called
  ক

  Solvent removable

  খ

  Water washable

  গ

  Post-emulsified

  ঘ

  Duel method
• If the surface crack causing fracture in a brittle material is made twice as deep, the fracture strength will
  ক

  decrease by a factor of √2

  খ

  decrease by a factor of 2

  গ

  decrease by a factor of 22

  ঘ

  No change
• The energy dispersive spectrometer (EDS) in an electron microscope does chemical analysis by analysing the energy of
  ক

  secondary electrons

  খ

  characteristics X-rays

  গ

  auger electrons

  ঘ

  back-scattered electrons
• Brittle fracture is more dangerous than ductile fracture because
  ক

  No warning sign

  খ

  Crack propagates at very high speeds

  গ

  No need for extra stress during crack propagation

  ঘ

  All are correct
• Match the suitability of non-destructive testing method in Group I for the detection of defects listed in Group II.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group I</strong></td> <td><strong>Group II</strong></td> </tr> <tr> <td>P. Magnetic particle inspection</td> <td>1. Surface crack in martensitic stainless steels</td> </tr> <tr> <td>Q. X-ray radiography</td> <td>2. Surface crack in austenitic stainless steels</td> </tr> <tr> <td>R. Dye penetrant test</td> <td>3. Hairline crack in aluminium</td> </tr> <tr> <td>S. Ultrasonic testing</td> <td>4. Inclusion in steels</td> </tr></table> P-2, Q-4, R-3, S-1

  খ

  P-4, Q-2, R-1, S-3

  গ

  P-3, Q-1, R-2, S-4

  ঘ

  P-1, Q-4, R-2, S-3
• Rockwell hardness on the 'C' scale is measured using an indentor with a
  ক

  120° diamond cone with a slightly rounded tip

  খ

  square base diamond pyramid

  গ

  10 mm diameter steel ball

  ঘ

  3 mm diameter steel ball
• A tensile specimen was deformed to a true strain of 0.405. The change in the gauge length was 5 mm. The final gauge length of the specimen, in mm, is
  ক

  10

  খ

  12

  গ

  15

  ঘ

  18
• Pyramid type diamond indenter is used in
  ক

  Brinell hardness testing

  খ

  Rockwell hardness testing

  গ

  Vickers hardness testing

  ঘ

  All of the above
• A 150 mm long cylinderical rod having a diameter of 100 mm contains six microvoids which are situated at radial distances of 5 mm, 8 mm, 12 mm. 20 mm, 30 mm, 36 mm respectively, on a given r-z plane. Along the length (z-direction) of the rod, the voids are spaced uniformly. The specimen is to be tested by an ultrasonic cylinderical probe, 7.5 mm in diameter: The maximum number of flows, that can be detected in a single measurement by placing the probe at one end of the rod (flat surface) is
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4
• How is the wavelength of scattered radiation compared to the primary beam?
  ক

  Longer than the wavelength of the primary beam

  খ

  Shorter than the wavelength of the primary beam

  গ

  Same as the wavelength of the primary beam

  ঘ

  Not related
• The resolution of an optical microscope is of the order of
  ক

  1nm

  খ

  1μm

  গ

  1mm

  ঘ

  1cm
• The ductile to brittle transition temperature of decreases by the addition of
  ক

  C

  খ

  Mn

  গ

  Al

  ঘ

  Ni
• Hydrogen embrittled steels samples can exhibit
  ক

  only clevage fracture

  খ

  clevage, dimple and intergranular fracture

  গ

  both clevage and dimple fracture

  ঘ

  only intergranular fracture
• When a longitudinal wave sound beam passes through an acoustic interface at some angle other than zero degrees
  ক

  Surface waves are generated

  খ

  Plate waves are generated

  গ

  Reflection, refraction and mode conversion will occur

  ঘ

  The first critical angle is reached
• Match the examination/inspection technique(s) in the following cases:<br>
  ক

  <table class="table-style-1"> <tr> <td>P. Internal crack developed in a component due to faulty metal flow conditions during its forging.</td> <td>1. X-ray diffraction</td> </tr> <tr> <td>Q. Segregation in steel casting.</td> <td>2. Dye penetrant test</td> </tr> <tr> <td>R. Hydride formation in a Tia Boy component due to its exposure to H₂ at high temperature.</td> <td>3. Sulphur printing</td> </tr> <tr> <td>S. Surface cracks formed on a car body during its manufacture.</td> <td>4. Radiography</td> </tr></table> P-4, Q-3, R-1, S-2

  খ

  P-3, Q-4, R-1, S-2

  গ

  P-4, Q-3, R-2, S-1

  ঘ

  P-2, Q-1, R-3, S-4
• Necking occurs in material at
  ক

  elastic limit

  খ

  proportional limit

  গ

  yield point

  ঘ

  UTS
• Which of the following are considered applications of ultrasonic testing?
  ক

  Determination of elastic constants

  খ

  Detection of defects in metals

  গ

  Measurement of material thickness

  ঘ

  none of these
• What is the most common source of penetrant bath contamination
  ক

  Emulsifier

  খ

  Water

  গ

  Developer

  ঘ

  Solvent
• Radiography technique of detecting defects is based on the principle of
  ক

  Diffraction

  খ

  Reflection

  গ

  Interference

  ঘ

  Absorption
• Match the NDT methods with the type of defects detected.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>NDT methods</strong></td> <td><strong>Type of defects detected</strong></td> </tr> <tr> <td>P. Ultrasonic</td> <td>1. Internal</td> </tr> <tr> <td>Q. X-ray</td> <td>2. Most</td> </tr> <tr> <td>R. Eddy current</td> <td>3. External</td> </tr> <tr> <td>S. Liquid penetrant</td> <td>4. Surface breaking</td> </tr></table> P-1, Q-2, R-3, S-4

  খ

  P-3, Q-1, R-2, S-4

  গ

  P-2, Q-1, R-3, S-4

  ঘ

  P-2, Q-4, R-1, S-3
• In fracture control design procedures, NDT plays an important role because it primarily enables to
  ক

  predict the time it will take for a given defect to grow to a critical size

  খ

  evaluate accurately the defect type, location and size that exist in the material

  গ

  measure the mechanical properties of the design materials

  ঘ

  measure the grain sizes of the microstructures in the materials
• Ultrasonic testing can be used for (choose the correct combination of the following statements P, Q, R, S):<br>P. Quantitative analysis of phases<br>Q. Determination of elastic constants<br>R. Determination of endurance limit<br>S. Detection of internal defects
  ক

  P, R

  খ

  P, Q

  গ

  Q, S

  ঘ

  R, S
• The best method for determining the average hardness of an aluminium casting is
  ক

  Rockwell A

  খ

  Rockwell C

  গ

  Knoop

  ঘ

  Brinnel

  ঙ

  Vickers
• The tensile test of a sheet material exhibits 20% elongation in length and 10% decrease in width. The plastic strain ratio is
  ক

  2.37

  খ

  1.37

  গ

  1.17

  ঘ

  0.87
• Radiographic appearance of inclusions resembles
  ক

  dark patches as compared to the background

  খ

  bright patches as compared to the background

  গ

  dark or bright patches depending on radiation energy

  ঘ

  dark or bright patches depending on relative dertsity
• Which of the following statements is/are true for ultrasonic test?
  ক

  Waves generated are health hazardous

  খ

  Complicated shapes can be easily scanned

  গ

  Equipment used for ultrasonic testing is portable

  ঘ

  All of these
• The ability of a material to resist deformations under the application of load is known as
  ক

  Malleability

  খ

  Elasticity

  গ

  ductility

  ঘ

  Stiffness