What should the resistance in the circuit of the moving coil of a dynamometer wattmeter be? Also, which brushes are fragile and cause excessive wear of the commutator?
Understand the Problem
The question is asking about the ideal resistance in the circuit of a moving coil for a dynamometer wattmeter and which type of brushes are fragile and cause excessive wear on the commutator.
Answer
High resistance; Natural graphite brushes.
The resistance in the moving coil circuit of a dynamometer wattmeter should be high. Natural graphite brushes are fragile and cause excessive wear of the commutator.
Answer for screen readers
The resistance in the moving coil circuit of a dynamometer wattmeter should be high. Natural graphite brushes are fragile and cause excessive wear of the commutator.
More Information
The high resistance of the moving coil ensures accurate measurement by minimizing the current passing through it. Natural graphite brushes are softer, leading to wear on the commutator.
Tips
Confusing resistance settings can cause inaccurate readings. Ensure correct brush material for longevity.
Sources
- Electrical Machine Design MCQ Questions & Answers - Examveda - examveda.com
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