Metrology and Measurements MCQs | Page - 1

 triangulation is by optical means. pacing is rough surveying. chaining gives almost accurate readings. taping gives accurate readings.

 it also transfers points from line ranger to the ground. spirit level is the instrument used to level the plane table by adjusting the spirit bubble in it to center.

 it generally consists of two laths, each of 1 yard or 1 m in length loosely tiered together. plumb bob is suspended at the center of the plane table to transfer the points on the plan to ground.

 plumb bob transfers points to the ground so it is used for centering. butt are used for measuring offsets.

 an interchangeable part is one that can be replaced with a similar part manufactured to the same drawing. it can be used in mass production with an economic oriented approach. assembly time decreases as mating parts are interchangeable.

 functional requirements are related to the function of a component that is what is required to do. interchangeability is for ease of replacement of part. economics is related to the minimum cost and time.

 for full interchangeability, only such machines are selected for manufacturing whose process capability ≤ manufacturing

 standardisation is important in interchangeability. it is essential to follow a common standard by all, only then interchangeability is possible. all standards used by the manufacturing unit are traceable to international standards.

 full interchangeability is also known as universal interchangeability. many times, universal interchangeability is not feasible because it requires machine capable of maintaining very high accuracy and high process capability.

 no. of groups segregated in selective assembly depends upon desired tolerance and process capability of machine. conditions like high quality and low cost can be achieved by selective assembly technique.