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Question 4
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- Copy and complete Table 1.
Table 1
Type of instrument |
Quantity measured with the instrument |
Method of control |
Method of damping |
Moving - coil |
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Moving - iron |
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- State one application each of the following:
- an ammeter;
- an ohmmeter.
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The expected answers were:
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Type of instrument |
Quantity measured with the instrument |
Method of control |
Method of damping |
Moving - coil |
Current and voltage (d.c. only) |
Hairsprings |
Eddy current |
Moving - iron |
Current and voltage (d.c. and a.c.) |
Hairsprings |
Air |
- (i) Ammeter application
Current measurement
(ii) Ohmmeter application
Impedance measurement
Resistance measurement
Insulation resistance measurement
The question was on Measuring Instruments. It was very popular with the candidates. Many candidates that attempted this question could not put complete/right answer in each cell. They could not state the applications of ammeter and ohmmeter.
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