QUESTIONS CORRECT RESPONSES
◉ Diffuse light would be most likely used on. Answer: Rough
surfaces
◉ Which of the following measuring devices makes measurements
on a linear scale that is subdivided into 40 graduations that
correspond to revolutions of revolving thimble. Answer: Micrometer
◉ Which of the following consist of a series of small, lengthy blades
of a calibrated thickness?. Answer: Feeler gages
◉ Go/no-go gages will:. Answer: provide evidence that a dimension
is within a given tolerance
◉ Which type of light source is used on rough surfaces to suppress
the surface structure?. Answer: Diffuse light
◉ One of the optional views offered with rigid borescope is a:.
Answer: Forward oblique view
,◉ Which of the following would be a reason to use mirrors when
performing a visual test?. Answer: Improve the angle of viewing
◉ Depth of field is defined as the:. Answer: range of distance in
which the object remains in focus
◉ The image in a rigid borescope being used for indirect visual
testing is transferred to the eye through:. Answer: A series of lenses
◉ Image resolution of a fiber borescope is dependent on which of
the following?. Answer: The diameter of the individual glass fiber.
◉ To increase the likelihood of detecting a discontinuity, the
following combination of contrast and illumination is required:.
Answer: High Contrast - High Illumination
◉ When using a micrometer, it is best to adjust the reading using
which of the following to prevent damage to the instrument?.
Answer: Ratchet
◉ Borescopes have different tips that can provide different viewing
angles. Which of the following viewing angles is best suited for small
details?. Answer: 35°-forward oblique view
, ◉ Using a borescope with a CCD camera would be considered:.
Answer: Remote visual testing
◉ Given a magnifier with a focal length of 2 in. (5 cm) and a standard
vision distance of the 10 in. (25.4 cm), the magnification would be:.
Answer: 5x
◉ What is the magnification of a lens with a focal length of 1.25 in.
(31.75 mm)?. Answer: 8x
◉ The charge-coupled device of a video borescope converts
radiation into the electrical signal. The voltage of this electrical
signal is:. Answer: Proportional to the light level received by the
individual pixel.
◉ What would be considered that standard vision distance as it
relates to magnification calculation?. Answer: 10 in. (25 cm)
◉ Indirect transfer calipers require:. Answer: the use of another
measuring device to obtain a reading
◉ A borescope has one end that is placed at the eye and the other
end placed at the point of the examination surface. The end at the
examination surface is called the:. Answer: Objective or distal end