Air Friction Damping Is Used in Which Instrument

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It does not need care as for the air friction method as clearance between wanes and the walls of the oil pot has no effect on the working of the instrument. Which type of instrument is used with air friction damping.

Damping Systems Air Friction Fluid Friction Eddy Current Damping

This method is used in moving iron and hot wire instruments.

. This method is used in moving iron and hot wire instruments. Fluid friction damping has an advantage that the oil can be used for damping as in oil. It cant be used in portable type instruments.

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The air friction damping is used for the instruments which have. PMMC and induction type which are used permanent magnet Electromagnet damping. Very high magnetic field.

Air friction damping is created by a piston oscillating in and out of an air chamber. Air friction damping should not be used where the deflecting torque in the instrument is produced due toi. Practical demonstration of air friction damping in moving iron instruments.

Therefore this type of damping is used in moving iron and dynamometer type of instruments where the operating magnetic field is weak and is likely to be get distorted with the introduction of a permanent magnet. But care must be taken that the piston is not bent or twisted otherwise it will touch walls of the chamber thereby causing serious errors. It can be used only for vertical position instruments.

It is used when the operating field is weak as used in moving the iron and electro-dynamometer type instrument. Air friction damping has the advantage that is does not require the use of a permanent magnet whose introduction may lead to distortion of the operating field. Errors due to friction are reduced to a great extent.

In moving-iron instruments the movable system consists of one or more pieces of specially-shaped soft iron which are so pivoted as to be acted upon by the magnetic field produced by the current in the coil. This relationship between the damping torque and the speed of rotation is given as. Hot wire Show AnswerAnswer.

This form is damping is similar to air friction damping. The damping torque and the speed of rotation of the moving system are proportional to each other. Electro-static voltmeter ESV and Induction type instruments.

This method is suited for electrostatic instruments where the movement is suspended rather pivoted. Very low magnetic field. Air Friction Damping light aluminum piston is attached to the spindle of the instrument and is arranged to move in a fixed air chamber closed at one end.

This method is often used in the presence of a relatively weak electrical field as air friction damping does not involve the use of any electric components that could. When the piston enters the chamber it causes compression when it exits the chamber there is a force acting back against it. The oil used serves two purposes one is for damping and the other is for heat dissipation.

The air friction damping is created in an air chamber by moving the piston in and out. Air friction damping is used in the instruments which is. But care must be taken to ensure that the piston is not bent or twisted.

PMMC type instruments normally use a Air friction damping b Fluid friction damping c Eddy current damping d None of the above. The action is the same as in the air friction damping. If an analog PMMC 0 10 A ammeter is provided with no controlling mechanism and the moving part are free to rotate what will be the reading of the instrument if a current of 1 A dc passed through the moving coil the torque produced is sufficient to overcome the frictional losses 1 A.

The moving iron instrument uses air friction damping. Air Friction damping provides a very simple and cheap method of damping. Moving-iron instruments are generally used to measure alternating voltages and currents.

Possibilities of leakage of oil in the. An indicating instrument provides the damping torque. It is the best-suited method for electrostatic type instruments.

Solutions for Chapter 13 Problem 25MCQ. The air friction damping is used for the instruments which have. 1 A dc potentiometer is designed to measure up to about 2 V with a slide wire of 800 mmA standard cell of emf 118 V obtains balance at 600 mmA test cell is seen to obtain balance at 680 mmThe emf of the test cell is 2 The circuit in Figure is used to measure the power consumed by the loadThe current coil and the voltage coil of the wattmeter have 002.

Moving iron MI and EDM Electro dynamometer instruments. The air friction damping is very simple and cheap.

Solved Which Type Of Damping Is Generally Preferred In Case Of Instruments Having A Weak Magnetic Field Electrical Exams