Non Destructive Testing Mid - I, September - 2014

1.In optical holography the angle between the reference beam ray and any one scattered ray from the object is β, then the fringe spacing δ, is given by _______
  • δ = λ + Sinβ
  • δ = λ – Sinβ
  • δ = λ / Sinβ
  • δ = λ x Sinβ
Answer: C
2.__________ can be used to detect movement of a surface and to detect fatigue effects causing surface distortion.
  • Borescopes
  • Speckle
  • Optical holography
  • In-situ metallography
Answer: B
3.__________ is/ are used for examining the internal surfaces of tubes and pipes.
  • Borescopes
  • Speckle
  • Optical holography
  • In-situ metallography
Answer: A
4.In X-ray radiography, if a cavity is spherical, the image will be ______ irrespective of the direction of the radiation.
  • Planar
  • Circular
  • Sharp line
  • Wavy
Answer: B
5.The _______ is a measure of the energy absorbed by a given volume of air in a beam of radiation.
  • rem
  • curie
  • roentgen
  • sievert
Answer: C
6.__________ was defined as the disintegration rate of the quantity of radon in equilibrium with one gram of radium.
  • Rem
  • Curie
  • Roentgen
  • Sievert
Answer: B
7.___________ method is an extension of the visual inspection method.
  • Radiographic
  • Electrical
  • Magnetic
  • Pentrant flaw detection
Answer: D
8._______ can also be used to produce diffraction patterns to study material structures.
  • X-rays
  • β-rays
  • α -rays
  • Δ-rays
Answer: A
9.The following is a piezoelectric material ___________
  • Topaz
  • Quartz
  • Calcite
  • Corundum
Answer: B
10.The following ultrasonic couplant can be used for hot surfaces up to about 300°C _____
  • Glycerine
  • Grease
  • Silicon oil
  • Polycell
Answer: C
11.Industrial telescopes, are usually known as _____________
Answer: Borescopes or Introscopes
12.____________ can be used for the measurement of small amounts of deformation under stress.
Answer: Optical holography
13.The simplest and oldest penetrant test is _______________
Answer: Oil and whiting technique
14.Penetrant inspection processes can be used to detect very small cracks having opening widths of about ___________
Answer: 1 μm
15.In the law of X-ray absorption, μ is known as ___________
Answer: Linear absorption co-efficient
16.____________ is a photographic image produced by a beam of penetrating ionising radiation after passing through a specimen.
Answer: Radiograph
17.The time interval between the transmitted and reflected pulses is a measure of the ______________ discontinuity from the surface.
Answer: Distance of the discontinuity
18.If the particle motion in a wave is along the line of the direction of travel of the wave, such waves are called ______________
Answer: Compressional wave
19.The half life of Cobalt-60 is ____________
Answer: 5.3 years
20.The slope of density (D) against exposure time (log10 E) curve at any point is called __________
Answer: Film gradient or Film contrast