Tolerance limits for dimensions of bricks in length, width and height are estimated considering a sample of _______ number of bricks taken together
- A10
- B20Correct
- C30
- D40
Solution
Concept
Tolerance limits for brick dimension testing
Formula
NONE
Step-by-step solution
1. Dimensions and tolerance limits of burnt clay bricks are evaluated by testing a sample batch of bricks. 3. Therefore, 40 bricks are considered for estimating length, width, and height tolerances. Answer: B
Explanation
Standard testing protocols specify taking a sample of 20 bricks randomly to determine dimensional tolerances in length, width, and height. Testing 20 bricks together helps average out individual manufacturing variations and gives an accurate measure for the entire consignment. Therefore, option B is correct.
Why the other options are wrong
A) A sample of 10 bricks is too small to determine dimension tolerances accurately. C) A sample size of 30 bricks does not meet the specified requirement of 40 bricks.
Shortcut
Sample size for checking brick dimension tolerances (length, width, height) is standardly 20 bricks.
Common mistake
Selecting option A or C by confusing the standard IS code sample size of 20 bricks with smaller or larger testing batches.
Correct answer: B) 20