Question: If an analog PMMC 0 – 10 A ammeter is provided with no controlling mechanism and the moving part are free to rotate, what will be the reading of the instrument if a current of 1 A (d.c) passed through the moving coil (the torque produced is sufficient to overcome the frictional losses)
Answer:
MCQ: If an analog PMMC 0 – 10 A ammeter is provided with no controlling mechanism and the moving part are free to rotate, what will be the reading of the instrument if a current of 1 A (d.c) passed through the moving coil (the torque produced is sufficient to overcome the frictional losses)
Correct Answer:
A. 1 A
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Related Questions
- 1. A spring controlled instrument uses phosphor bronze springs to produce controlling torque. if the ratio of length of spring to thickness of spring is 3000 for a deflection 90°, what should be this ration if the scale is to extended to 120°
- 2. A voltage of 200 V produce a deflection of 90° in a PMMC spring controlled instrument. if the same instrument is provided with gravity control, what would be the deflection?
- 3. A spring produces a controlling torque of 16 × 10<sup>-6 </sup>Nm for a deflection of 120°. Suppose its width and length are made two times their original value and thickness is halved , the value of controlling torque for the same deflection will be :
- 4. Air friction damping should not be used where the deflecting torque in the instrument is produced due to
- 5. Fluid friction damping can be used in
- 6. Permanent magnets used in the instruments are hard core materials because
- 7. A spring produces a controlling torque of 16x10<sup>-6</sup> Nm for a deflection of 120Y. If the width and length become two times their original values and the thickness is halved, the value of controlling torque for the same deflection will be
- 8. The shunt resistance in an ammeter is usually
- 9. A voltage of 200 V produces a deflection of 90° in a PMMC spring-controlled instrument. If the same instrument is provided with gravity control, what would be the deflection?
- 10. The high torque to weight ratio in an analog indicating instrument indicates
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