In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because-A-contacts wear offB-strength of permanent magnet decreases with ageC-armature current produces heating effectD-there is back emf-B-strength of permanent magnet decreases with age

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B strength of permanent magnet decreases with age No answer description is available.

Measurements and Instrumentation - Engineering

In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because

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Measurements and Instrumentation - Engineering

In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because

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