The expected answers were:

(a) The basic operational devices of a moving-coil instrument are the:
- deflecting device (pointer),
- controlling device (spring or weight),
- damping device (magnet or air).
(b) (i) The advantages of the moving-coil instrument include:
- high sensitivity, .
- uniform scale,
- not .affected by external magnetic field,
- can be used as a multi range instrument.
(ii) The advantage of the moving-iron instrument include:
- relatively cheap,
- can withstand heavy overload,
- non-polarized,
- robust.
I•
(c) Uses of the cathode ray oscilloscope are:
- frequency measurement,
- amplitude measurement,
- waveform display,
- measurement of ac/dc voltages,
- phase measurement,
- modulation, percentage,
- standing waves in transmission lines,
- amplifier gain.

This question was on measuring instruments. The question was popular. The performance was very encouraging. This was purely a recall question that was