Question

Which of the following is incorrect about end bars?

(a) There are 4 grades of accuracy are available

(b) Bars above 150 mm generally not found in a majority of engineering work

(c) Workshop grades have internal threaded ends

(d) Inspection grades have external threaded ends only

This question was posed to me in a job interview.

This interesting question is from End Standards in section Standards of Measurements of Engineering Metrology

Answer 1

Right answer is (d) Inspection grades have external threaded ends only

The explanation is: 4 grades of accuracy are reference, calibration, inspection and workshop. Inspection and workshop both grades have internal threaded ends.