tolerances

Why tolerances are given to the parts?

• a) Because it’s impossible to make perfect settings

• b) To reduce weight of the component

• c) To reduce cost of the assembly

• d) To reduce amount of material used

What is bilateral tolerance?

• a) Total tolerance is in 1 direction only

• b) Total tolerance is in both the directions

• c) May or may not be in one direction

• d) Tolerance provided all over the component body

Which type of tolerance provided in drilling mostly?

• a) Bilateral

• b) Unilateral

• c) Trilateral

• d) Compound

What is mean clearance?

• a) Maximum size of hole minus maximum size of shaft

• b) Minimum size of hole minus minimum size of shaft

• c) Mean size of hole minus mean size of shaft

• d) Average of both size of shaft and hole

Which of the following is incorrect about tolerances?

• a) Too loose tolerance results in high cost

• b) Tolerance is a compromise between accuracy and ability

• c) Too tight tolerance may result in excessive cost

• d) Fit between mating components is decided by functional requirements

If a clearance fit is present between shaft and hole, what is the tolerance on shaft or hole for a complete interchangeable approach?

• a) ½ of maximum clearance – ½ of minimum clearance

• b) ¼ of maximum clearance – ¼ of minimum clearance

• c) Maximum clearance – minimum clearance

• d) ¾ of maximum clearance – ¾ of minimum clearance

In a shaft basis system, the upper deviation of the size of the shaft is ______

• .(A) 1

• (B) not related to size

• (C) less than 0

• (D) 0

MML corresponds to the _______.

• (A) higher limit of a hole and lower limit of the shaft

• (B) lower limit of a hole and lower limit of the shaft

• (C) higher limit of a hole and higher limit of the shaft

• (D) lower limit of a hole and higher limit of the shaft

LML corresponds to the ______.

• (A) higher limit of a hole and lower limit of the shaft

• (B) lower limit of a hole and lower limit of the shaft

• (C) higher limit of a hole and higher limit of the shaft

• (D) lower limit of a hole and higher limit of the shaft

The relationship that results between the two mating parts before assembly is called ______.

• (A) tolerance

• (B) allowance

• (C) limit

• (D) fit