Basic shaft is one
A. Whose upper deviation is zero
B. Whose lower deviation is zero
C. Whose lower as well as upper deviations are zero
D. Does not exist
Answer: Option A
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Basic Shaft: If the upper limit size or maximum size of the shaft is equal to the basic size then that type of hole is known as Basic Shaft for a given shaft and hole assembly.
For the basic shaft the zero line will be lying on the maximum size of the shaft. For the basic shaft upper deviation will be zero because the difference between Upper Limit Size and Basic Size is zero.
Basic Hole: If the lower limit size or minimum size of hole is equal to the basic size then that type of hole is known as basic hole for a given assembly of hole and shaft.
For the basic hole the zero line will be lying on minimum size of the hole. For the Basic Hole the lower deviation is zero because the difference between the Lower Limit Size and Basic Size is zero.