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WorksheetsMeasurement Instruments Quiz
Total questions: 10
Worksheet time: 5mins
Which of the following instruments operates on the principle of interaction between a permanent magnet field and a current-carrying coil?
Moving Coil
Electrodynamometer
Moving Iron
Permanent Magnet Moving Coil (PMMC)
What is a key characteristic of electrodynamometer instruments?
They measure only AC
They use fixed and moving coils to produce torque
They are only for DC measurements
They have no moving parts
In which type of Moving Iron (MI) instrument does the moving iron piece get attracted towards the fixed coil when current flows?
Repulsive MI
Attractive MI
Inductive MI
Capacitive MI
If the true value of a measurement is 100 V and the measured value is 102 V, what is the relative error?
0.01
0.02
0.03
0.04
PMMC instruments can directly measure alternating current (AC) without any rectification.
True
False
Hysteresis error is a common type of error in Moving Iron (MI) instruments due to the magnetic properties of iron.
True
False
Relative accuracy is typically calculated as 1 minus the relative error.
True
False
In repulsive Moving Iron (MI) instruments, the deflection is caused by the (a) between two iron pieces, one fixed and one moving.
The percentage error in a measurement is given by (absolute error / true value) × (a) .
Errors in MI instruments can include frequency errors, which become significant at (a) frequencies.
