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Which one of the following instruments is commonly used to measure primary current ofa transformer connected to mains
- a)electrostatic meter
- b)current transformer
- c)moving coil type meter
- d)moving iron meter124. The efficiency of dc generator
Correct answer is option 'D'. Can you explain this answer?
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Which one of the following instruments is commonly used to measure pri...
Primary current measurement of a transformer connected to mains is commonly done using a Current Transformer (CT).
Explanation:
1. Current Transformer (CT):
A current transformer is a type of instrument transformer that is used for measuring high currents. It consists of a primary winding and a secondary winding, with the primary winding connected in series with the primary current to be measured. The secondary winding is connected to a measuring instrument, such as a current meter or a relay, which is used to measure or monitor the primary current.
2. Electrostatic Meter:
An electrostatic meter is not commonly used for measuring primary current of a transformer. Electrostatic meters are typically used for measuring voltage or electric field strength.
3. Moving Coil Type Meter:
A moving coil type meter, also known as a galvanometer, is used for measuring low currents. It consists of a coil suspended in a magnetic field, and when a current passes through the coil, it experiences a torque that causes it to rotate. Moving coil meters are not suitable for measuring high currents.
4. Moving Iron Meter:
A moving iron meter is also not commonly used for measuring primary current of a transformer. Moving iron meters are typically used for measuring AC or DC currents in low to medium ranges.
In conclusion, the most commonly used instrument for measuring primary current of a transformer connected to mains is a Current Transformer (CT). CTs are specifically designed for this purpose and are capable of accurately measuring high currents.
Explanation:
1. Current Transformer (CT):
A current transformer is a type of instrument transformer that is used for measuring high currents. It consists of a primary winding and a secondary winding, with the primary winding connected in series with the primary current to be measured. The secondary winding is connected to a measuring instrument, such as a current meter or a relay, which is used to measure or monitor the primary current.
2. Electrostatic Meter:
An electrostatic meter is not commonly used for measuring primary current of a transformer. Electrostatic meters are typically used for measuring voltage or electric field strength.
3. Moving Coil Type Meter:
A moving coil type meter, also known as a galvanometer, is used for measuring low currents. It consists of a coil suspended in a magnetic field, and when a current passes through the coil, it experiences a torque that causes it to rotate. Moving coil meters are not suitable for measuring high currents.
4. Moving Iron Meter:
A moving iron meter is also not commonly used for measuring primary current of a transformer. Moving iron meters are typically used for measuring AC or DC currents in low to medium ranges.
In conclusion, the most commonly used instrument for measuring primary current of a transformer connected to mains is a Current Transformer (CT). CTs are specifically designed for this purpose and are capable of accurately measuring high currents.
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Which one of the following instruments is commonly used to measure primary current ofa transformer connected to mainsa)electrostatic meterb)current transformerc)moving coil type meterd)moving iron meter124. The efficiency of dc generatorCorrect answer is option 'D'. Can you explain this answer?
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