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Two voltmeters of (0-300V) range are connected in parallel to an A.C. circuit. One voltmeter is moving iron type reads 200V. If the other is PMMC instrument, its reading will be-
- a)12.74 V
- b)slightly less 200 V
- c)Zero
- d)222 V
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Two voltmeters of (0-300V) range are connected in parallel to an A.C....
PMMC instruments are used only for DC and voltage. For AC supply, no deflection will be there due to instantaneous opposite torques.
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Two voltmeters of (0-300V) range are connected in parallel to an A.C....
Explanation:
When two voltmeters are connected in parallel to an AC circuit, they will experience the same voltage across them. However, the readings on the voltmeters will depend on the type of instrument used.
Moving Iron Type Voltmeter:
- A moving iron type voltmeter is an instrument that uses the attraction between a fixed coil and a movable iron core to measure voltage.
- The reading on a moving iron type voltmeter is not linear and depends on the frequency and waveform of the AC signal.
- In this case, the moving iron type voltmeter reads 200V.
PMMC Instrument:
- A PMMC (Permanent Magnet Moving Coil) instrument is a type of instrument that uses a permanent magnet and a moving coil to measure voltage.
- The PMMC instrument is designed to give accurate readings for DC circuits or for AC circuits with a frequency within its operating range.
- The PMMC instrument is not suitable for measuring AC voltage accurately, especially when the frequency is high or the waveform is non-sinusoidal.
- In this case, when connected in parallel to the same AC circuit, the PMMC instrument will read zero volts.
Reasoning:
- The reason the PMMC instrument reads zero volts is because it is not designed to accurately measure AC voltage.
- The moving iron type voltmeter reads 200V, which means that the voltage across both voltmeters is 200V.
- Since the PMMC instrument is not able to accurately measure AC voltage, it will not give any reading and will effectively read zero volts.
Therefore, the correct answer is option 'C' - Zero.
When two voltmeters are connected in parallel to an AC circuit, they will experience the same voltage across them. However, the readings on the voltmeters will depend on the type of instrument used.
Moving Iron Type Voltmeter:
- A moving iron type voltmeter is an instrument that uses the attraction between a fixed coil and a movable iron core to measure voltage.
- The reading on a moving iron type voltmeter is not linear and depends on the frequency and waveform of the AC signal.
- In this case, the moving iron type voltmeter reads 200V.
PMMC Instrument:
- A PMMC (Permanent Magnet Moving Coil) instrument is a type of instrument that uses a permanent magnet and a moving coil to measure voltage.
- The PMMC instrument is designed to give accurate readings for DC circuits or for AC circuits with a frequency within its operating range.
- The PMMC instrument is not suitable for measuring AC voltage accurately, especially when the frequency is high or the waveform is non-sinusoidal.
- In this case, when connected in parallel to the same AC circuit, the PMMC instrument will read zero volts.
Reasoning:
- The reason the PMMC instrument reads zero volts is because it is not designed to accurately measure AC voltage.
- The moving iron type voltmeter reads 200V, which means that the voltage across both voltmeters is 200V.
- Since the PMMC instrument is not able to accurately measure AC voltage, it will not give any reading and will effectively read zero volts.
Therefore, the correct answer is option 'C' - Zero.
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Two voltmeters of (0-300V) range are connected in parallel to an A.C....
C
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