Question: A PMMC instrument is spring controlled. The control spring stiffness decreases by about 0.04 percent per °C rise in temperature and the strength of magnets goes down by 0.02 percent per °C rise in temperature. The rise in temperature is 10 °C the deflection
Answer:
MCQ: A PMMC instrument is spring controlled. The control spring stiffness decreases by about 0.04 percent per °C rise in temperature and the strength of magnets goes down by 0.02 percent per °C rise in temperature. The rise in temperature is 10 °C the deflection
Correct Answer:
A. Decreases by about 0.2 percent
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Related Questions
- 1. The power consumption PMMC instrument is typically about :
- 2. In a series type ohmmeter :
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- 4. A series type ohmmeter is designed with a d’Arsonval movement having full scale current of 0.5 mA and an internal resistance. It uses a battery of 3 V and has a half scale resistance of 3000Ω. The battery voltage goes down to 2.7 V. what is the value of shunt resistance required so that full scale current is obtained if the meter terminals are short circuited?
- 5. A make break switch is provided to disconnect the battery when the meter is not in use in
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- 7. The controlling torque in a meggar is provided by :
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