A basic hole is one whose
A
Lower deviation is zero
B
Upper deviation is zero
C
Lower and upper deviations are zero
D
None of these
Correct Answer: Lower deviation is zero
A basic hole is one whose Lower deviation is zero.Upper Deviation: It is the algebraic difference between the maximum size and the basic size. The upper deviation of a hole is represented by a symbol ES and of a shaft, it is represented by ES.
Lower Deviation: It is the algebraic difference between the minimum size and the basic size.
