What is Attraction type instrument?
Attraction Type – The instrument in which the iron plate attracts from the weaker field towards the stronger field such type of instrument is known as the attraction type instrument. Construction of Attraction Type Instrument – The stationary coil of the attraction type instrument is flat and has a narrow opening.
What are the types of moving coil instrument?
There are two types of moving coil instruments namely, permanent magnet moving coil type which can only be used for direct current, voltage measurements and the dynamometer type which can be used on either direct or alternating current, voltage measurements.
What is the major difference between attraction and repulsion type moving iron instrument?
The instrument wherein the moving iron is employed to calculate the current or voltage is known as the moving iron instruments. If the iron gets attracted towards the magnet, it is attraction and if it moves away then it is repulsion.
What is the difference between MI and MC type instruments?
The moving iron instrument consumes more power as compared to the moving coil instrument. The moving iron instrument is used for measuring both the direct and alternating current whereas the moving coil is used for the DC measurement.
What is the difference between moving coil and moving iron instruments?
The moving iron instrument is used for measuring both the direct and alternating current whereas the moving coil is used for the DC measurement. In moving iron instruments, the gravity or spring provides the controlling torque to the instrument.
What are moving instruments?
Definition: The instrument in which the moving iron is used for measuring the flow of current or voltage is known as the moving iron instrument. It works on the principle that the iron place near the magnet attracts towards it. The force of attraction depends on the strength of the magnet field.
What are moving coils?
The Moving Coil (MC) Cartridge Two coils are attached to the cantilever and move within the field of a fixed permanent magnet located inside the cartridge body to form the generator. The coils are much smaller than the coils used in the moving magnet design, and they are made from very thin copper wire.
What is repulsion type moving iron instrument?
Repulsion type moving iron instruments are used both for ac and dc measurements. In these instruments, when current flows through the coil, the two vanes i.e., fixed vane and movable vane are magnetized and same polarities are induced in it which results in a force of repulsion between them.
What are the differences between moving coil and moving iron instrument?
The moving iron instrument uses the air friction damping while the moving coil instrument uses the eddy current damping system. The moving iron instrument is used for measuring both the direct and alternating current whereas the moving coil is used for the DC measurement.
How will you differentiate between moving coil and moving iron meters?
Difference between Moving Coil and Moving Iron Meter
| Moving Iron Meter | Moving Coil Meter |
|---|---|
| Moving Iron meter use Air damping | Moving Coil uses Eddy current damping |
| Reliable accuracy | Accuracy is high |
| High power consumption | Low power consumption |
| Moving Iron can be used in AC and DC circuits | Moving Coil can be used in DC circuits only |
What is MC and MI ammeter?
The difference between Moving iron meter and Moving coil meter is, moving iron meter operates on electromagnetic principle. Whereas, moving coil meter works on DC motor principle. Moving Iron meter measures DC current, AC current, DC voltage, AC voltage.
What is induction type instrument?
Induction type instruments essentially have an electromagnet to produce the required magnetic field. AC in the electromagnet produces changing flux between its poles. Here, we place one aluminum disc (or aluminum drum) in the magnetic field. Hence, the changing flux links with the aluminum disc.
Which is the attraction type of moving iron instrument?
Attraction Type Moving Iron Instrument In this type, the iron plate is attracted towards the stronger field from the weaker field is termed as the attraction type of instrument. Here, the static coil in the device is in a flat shape and it has a small opening. The movable element is considered as the iron core’s flat disc.
How does a moving iron instrument work on a coil?
In attraction type moving iron instruments, an oval-shaped disc made up of soft iron is pivoted on the spindle near the coil. When the current to be measured is passed through the coil, then coil produces a magnetic field and attracts the oval-shaped disc, hence disc will swing into the coil.
How is a moving iron instrument a repulsion instrument?
Repulsion-type Moving-Iron Instruments In the repulsion type, there are two vanes inside the coil. One is fixed and the other is movable. These are similarly magnetized when the current flows through the coil and there is a force of repulsion between the two vanes resulting in the movement of the moving vane.
How are vanes attached to moving iron instruments?
In this type, the vanes are radial strips of iron. The strips are placed within the coil as shown in the figure. The fixed vane is attached to the coil and the movable one to the spindle of the instrument. The instrument pointer is attached to the moving vane spindle.