The expected answers were:
- Any two of the instruments stated below
- Moving-coil
- Moving-iron
- Multimeter
- Insulation Resistance Meter
- Ohmmeter
- Wattmeter
- Watt-hour meter
- (i) 20 x 10-3 x 10 = 9.98 x Rsh
Rsh = 0.020 Ω
(ii)
20 x 10-3(10 + R) = 10
R = 500 – 10 = 490 Ω
The question was on Measuring Instruments. It was very popular with the candidates. Many candidates that attempted this question performed well.