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when our instrument is ready to use . We switch on the supply, and E.M.F will induced due to that E.M.F the starting torque will produce in the coil and it will deflect hte needle due to the E.M.F induced in the ckt .. it for A.C. purpose nw we can also use this for dc measurment by reversr this process .when we reverse this process the torque will reversed and the need will change its position due to deflecting torque . so by these we can use it on booth supplyes on A.C. as well as D.C...
AnswerAn 'attraction type' moving-iron instrument consist of a coil, through which the test current is passed, and a pivoted soft-iron mass attached to the pointer. The resulting magnetic polarity at the end of the coil nearest the iron mass then induces the opposite magnetic polarity into the part of the iron mass nearest the coil, which is then drawn by attraction towards the coil, deflecting the pointer across a scale.
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∙ 12y ago
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∙ 16y agoMoving Iron Vane Movement The moving iron vane movement can be used to measure both AC current and voltage. By changing the meter scale calibration, the movement can be used to measure DC current and voltage. The moving iron vane meter operates on the principle of magnetic repulsion between like poles. The measured current flows through a field coil which produces a magnetic field proportional to the magnitude of current. Suspended in this field are two iron vanes attached to a pointer. The two iron vanes consist of one fixed and one moveable vane. The magnetic field produced by the current flow magnetizes the two iron vanes with the same polarity regardless of the direction of current through the coil. Since like poles repel one another, the moving iron vane pulls away from the fixed vane and moves the meter pointer. This motion exerts a force against a spring. The distance the moving iron vane will travel against the spring depends on the strength of the magnetic field. The strength of the magnetic field depends on the magnitude of current flow. Figure 3 Moving Iron Vane Meter Movement As stated previously, this type of meter movement may also be used to measure voltage. When this type of movement is used to measure voltage, the field coil consists of many turns of fine wire used to generate a strong magnetic field with only a small current flow.
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∙ 13y agoA plate or vane of soft iron or high permeability steel forms the moving element of system,this iron vane is so situated that it can move in a magnetic field produced by a stationary coil
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∙ 14y agoattraction type and repulsion type
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Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
Can instrument transformers be used to extend the range of a moving coil voltmeter?
Not directly, as MC instruments are direct-current instruments, whereas instrument transformers only work on a.c.
Why are moving iron test instruments not used with DC although they can work in DC?
For moving-iron instrument magnetic field is caused when the current (voltage) passes the fixed circle. When the current (voltage) passes the fixed circle，the two iron plates are magnetized ,rotational torque is resulted, the deflection angle indicate measured current. Because the magnetized polarity is same for AC or DC, moving-iron instrument can be used in AC and DC circuit. For permanent-magnet moving-coil instrument magnetic field is caused by the permanent-magnet, When the DC current passes the moving coil, rotational torque is resulted,so the deflection angle indicate measured DC current. As AC current passes the moving coil ,because inertia of moving parts of meter the deflection angle indicate rotational torque average, but rotational torque average is zero in cycle, moving parts of meter is´t deflec,so permanent-magnet moving-coil instrument only is used in DC circuit.
Why moving iron is used in both AC and DC current?
A moving iron instrument works by means of a coil that attracts a moving iron mass that is attached to a pivoted pointer which moves across a graduated scale. The iron mass will be attracted towards the coil, regardless of the magnetic polarity of the coil. So, as an AC current continually reverses the magnetic polarity of the coil, the iron mass is always attracted towards the coil, never repelled by it. Similarly, a moving iron instrument doesn't care in which direction a DC current is flowing. So the instrument works equally well with both AC and DC currents. Moving iron instruments, however, are not as accurate as moving coil instruments which, of course, are sensitive to the direction of current.
Working principle of induction type instrument?
it works on the principle of induction i.e. on the production of eddy currents in the moving system by the alternating fluxes
Is megger related to hot wire instrument moving coil or moving iron?
It is related to moving coil type instrument
Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
What is the construction and working details of moving iron and moving coil ammeters and moving coil voltmeters?
Different b/w a moving coil instrument and a moving iron instrument
What instrument is played by moving a slide back and fourth?
A trombone is an instrument that is played moving a slide back and forth.
Which US cities offer services by the Flat Rate Moving company?
The Flat Rate Moving company operates in a few states. The states that the company Flat Rate Moving operates in are New York, New Jersey, California, and Florida.
Why are moving iron instruments unpolarized?
Moving-coil instruments are polarised, not unpolarised. This is because they are direct current instruments, and the direction of the current determines the direction in which the instrument's point will move. If a moving coil instrument is connected incorrectly, then the instrument will try and read 'downscale' -in other words, the resulting torque will try and move the pointer backwards.AnswerA moving-iron meter operates by the repulsion between a fixed iron pole piece, and a moving iron pole piece to which the pointer is attached. The magnetic polarity of the fixed and moving pole pieces is determined by the direction of current flowing though a coil. The magnetic polarities induced into the fixed and moving iron pole pieces, when the current flows in one direction, are both north; and, when the current flows in the oppositedirection are both south. So the pole pieces always repel each other, regardless of current direction.
Instrument which does not have restoring torque?
moving iron instruments
What is a non-pitched instrument?
an instrument that is used in percussion that has no actual moving pitch. snare drum for example.
Types of Internet static and dynamic - explain this?
Static: Not Moving Dynamic: Moving
What is the instrument measure the speed of a moving vehicle?
The speedometer.
What is moving coil voltmeter?
mic or moving iron coil is instrument type works on ac and dc
Are the particles in a gas moving fast with no forces of attraction between them?
Yes that's right
