Question 2
(a) (i) Identify the instrument.
(ii) Name the parts labelled J, K, L, M and N.
(iii) State the function of the instrument
(b) Sketch a piston and label three of its parts.
Observation
Candidates’ responses to 2(a) were not adequate. Their responses to 2(b), however, were not satisfactory. The solution to the poorly answered part of the question is given below
(d) (i) The Name of the Instrument
Outside or External micrometer, external micrometer
gauge or external micrometer screw gauge.
(ii) Names of Labelled Parts
J: Anvil
K: Spindle
L: Locknut, locker or lock
M: Ratchet
N: Barrel or sleeve
(iii) Function of the Instrument
The instrument is used to measure, to precision, the external diameter ofobjects.