Electrical Engineering XYZ MCQs
Purely mechanical instruments cannot be used for dynamic measurements because they have:
- Large time constant
- High inertia
- Higher response time
- All of these
Correct answer: 4. All of these
Explanation:
- Large time constant: Mechanical instruments may have large time constants, meaning they respond slowly to changes. This can be a limitation when measuring dynamic or rapidly changing quantities.
- High inertia: Inertia is the resistance of a mass to changes in its state of motion. Instruments with high inertia may not be able to respond quickly to rapid changes in the measured quantity.
- Higher response time: Mechanical instruments, due to their inherent physical properties, often have a higher response time. This means they may take longer to reach a steady-state or accurately reflect changes in the measured quantity.
All these factors contribute to the limitations of purely mechanical instruments when it comes to dynamic measurements, where a quick and accurate response to changes is essential.