Question

What is incorrect about the combination set?

(a) A non-reversible type protractor head can be used

(b) Cast iron heads have a black wrinkle finish

(c) Protractor scale is graduated from 0-360 degree

(d) Centre of a round block can be located by centre head

This question was posed to me in my homework.

This is a very interesting question from Combination Set topic in section Linear Measurements of Engineering Metrology

Answer 1

Right answer is (c) Protractor scale is graduated from 0-360 degree

The explanation: Protractor scale has 0-90 degree graduation on either side of centre or has 0-180 degree graduations. In some combinations sets, non-reversible types of protractor heads are also present.