Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Moving coil instruments are –a)Permanen...
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Moving coil instruments are –
- a)Permanent magnet type
- b)Dynamometer type
- c)Induction type
- d)Permanent magnet and dynamometer type
Correct answer is option 'D'. Can you explain this answer?
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Moving coil instruments are –a)Permanent magnet typeb)Dynamomete...
Moving Coil Instruments
Moving coil instruments are one of the most commonly used instruments in electrical engineering. They work on the principle of attraction or repulsion between two magnetic fields. The magnetic field is either produced by a permanent magnet or an electromagnet.
Types of Moving Coil Instruments
There are mainly two types of moving coil instruments:
1. Permanent Magnet Type
2. Dynamometer Type
Permanent Magnet Type
In the permanent magnet type of moving coil instrument, the magnetic field required for the operation of the instrument is produced by a permanent magnet. The coil is mounted on a spindle and is free to rotate in the magnetic field produced by the permanent magnet.
Dynamometer Type
In the dynamometer type of moving coil instrument, the magnetic field required for the operation of the instrument is produced by an electromagnet. The coil is mounted on a spindle and is free to rotate in the magnetic field produced by the electromagnet.
Permanent Magnet and Dynamometer Type
There are also instruments that combine both permanent magnet and dynamometer type principles. These instruments are called permanent magnet and dynamometer type instruments. In these instruments, the magnetic field required for the operation of the instrument is produced by a combination of a permanent magnet and an electromagnet.
Advantages and Disadvantages
The advantages of permanent magnet type instruments are that they are simple and do not require any external power source. The disadvantages are that they are not very accurate and have a limited range of operation.
The advantages of dynamometer type instruments are that they are very accurate and have a wide range of operation. The disadvantages are that they require an external power source and are more complex than permanent magnet type instruments.
Conclusion
In conclusion, moving coil instruments are an essential tool in electrical engineering. They work on the principle of attraction or repulsion between two magnetic fields. The type of moving coil instrument used depends on the application and the accuracy required.
Moving coil instruments are one of the most commonly used instruments in electrical engineering. They work on the principle of attraction or repulsion between two magnetic fields. The magnetic field is either produced by a permanent magnet or an electromagnet.
Types of Moving Coil Instruments
There are mainly two types of moving coil instruments:
1. Permanent Magnet Type
2. Dynamometer Type
Permanent Magnet Type
In the permanent magnet type of moving coil instrument, the magnetic field required for the operation of the instrument is produced by a permanent magnet. The coil is mounted on a spindle and is free to rotate in the magnetic field produced by the permanent magnet.
Dynamometer Type
In the dynamometer type of moving coil instrument, the magnetic field required for the operation of the instrument is produced by an electromagnet. The coil is mounted on a spindle and is free to rotate in the magnetic field produced by the electromagnet.
Permanent Magnet and Dynamometer Type
There are also instruments that combine both permanent magnet and dynamometer type principles. These instruments are called permanent magnet and dynamometer type instruments. In these instruments, the magnetic field required for the operation of the instrument is produced by a combination of a permanent magnet and an electromagnet.
Advantages and Disadvantages
The advantages of permanent magnet type instruments are that they are simple and do not require any external power source. The disadvantages are that they are not very accurate and have a limited range of operation.
The advantages of dynamometer type instruments are that they are very accurate and have a wide range of operation. The disadvantages are that they require an external power source and are more complex than permanent magnet type instruments.
Conclusion
In conclusion, moving coil instruments are an essential tool in electrical engineering. They work on the principle of attraction or repulsion between two magnetic fields. The type of moving coil instrument used depends on the application and the accuracy required.
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Moving coil instruments are –a)Permanent magnet typeb)Dynamometer typec)Induction typed)Permanent magnet and dynamometer typeCorrect answer is option 'D'. Can you explain this answer?
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