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A1: For ac(let fre. of 50 hz) changes its direction 100 times a second...(50 times -ive and 50 times +ive) giving no significant movement
A2: What is meant by this question? What moving coil are you referring to? Many AC motors have two coils of wire, and one definitely moves.
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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.
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
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.
What is the Operating Principles of Moving Coil Instrument?
The basic principle of moving iron instruments is it works on the principal of magnetic repulsion.... it consists of two irons one stationary n other fixed to a moving pointer small current flows through a coil surrounding the irons.this creates a magnetic field ,which magnetise the two irons.. the magnetise iron will develop a repulsion force between each other, this will cause the pointer to move against the spring the pointer stop moving when the spring tension equals the repulsion force between the magnets...
Does steel seal really works on blown head gasket?
As an emergency repair yes. The only permanent repair is to replace the gasket.
