railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Metrology and Inspection
Consider the following statement:
(i) Mechanical comparators are used for very high accuracy
(ii) Optical comparators use both optical and mechanical means to get magnification
(iii) Pneumatic comparators are used for very high magnification
(iv) Dial indicator is the most widely used mechanical comparator1
(ii), (iii) and (iv) are true
2
Only (iii) is true
3
(i), (ii) and (iii) are true
4
(i) and (ii) are true