Metrology and Surface Engineering Mid - I, September - 2014

1.In hole basis system fit is obtained by
  • Choosing a basic hole
  • varying hole size
  • basic shaft is chosen
  • none of the above
Answer: A
2.The units of standard tolerance unit i
  • mm
  • inches
  • microns
  • grade of tolerance
Answer: C
3.The magnitude of D in the tolerance unit i corresponds to
  • exact value of D in mm
  • average size of extreme values in the basic step
  • geometric mean of the limiting values of D in basic step
  • in microns
Answer: C
4.Wear allowance is provided on
  • Go gauge
  • adjustable snap gauge
  • No go gauge
  • position gauge
Answer: A
5.Standard meter is platinum 10% iridium alloy is supported at Airy points has the distance between 2 supports
  • 0.577L
  • 0.554L
  • 0.75L
  • L
Answer: A
6.To measure a given angle with sine bar requires
  • angle gauges
  • slip gauges
  • bevel protractor
  • spirit level
Answer: B
7._______is an angle measuring instrument of high precision with a wide variety of applications
  • bevel protractor
  • sine bar
  • spirit level
  • taper ring gauge
Answer: B
8.Autocollimator uses.
  • white light
  • mercury light
  • monochromatic light
  • sodium vapour lamp
Answer: A
9.Flatness interferometer checks
  • Parallelism of slip gauge surfaces
  • angle of angle gauge
  • length of slip gauge
  • angular indexing
Answer: A
10.Lay in the surface finish is due to
  • irregularities in the surface roughness
  • method of production
  • work deflection
  • machine vibration
Answer: B
11.The permissible variation in dimensions is called __________
Answer: Tolerance
12.For hole the relationship of deviation with tolerance is given by IT= _____________
Answer: IT=ES-EI
13.Basic shaft is the shaft whose ______________ deviation is zero while basic hole is that whose______________ deviation is zero .
Answer: Upper,Lower
14.The prototype meter is made of ______________ alloy.
Answer: Platinum &10% irredium
15.The least count of a micrometer is _______________mm.
Answer: Pitch on the screw/no. of divisions on spindle
16.Screw pitch can be measured by _______________
Answer: Tool makers microscope
17.An optical flat must be made of _____________material.
Answer: Transparent
18.Autocollimator is used for the measurement of ___________displacements.
Answer: Angular
19.The two groups of irregularities are____________ and ____________
Answer: Roughness & waviness
20.Surface roughness is measured by _____________instrument.
Answer: Talysurf/surface meter/mecrin/profile graph