Air Friction Damping Is Used in the Instrument Which Is

- April 20, 2022

An analog instrument is one in which the output or display is a continuous function of time and bears a constant relation to its input. This form is damping is similar to air friction damping.

Damping Torque Air Friction Fluid Friction Eddy Current 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. 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. Login into Examveda with.

Errors due to friction are reduced to a great extent. Air Friction damping provides a very simple and cheap method of damping. Solutions for Chapter 13 Problem 25MCQ.

Air friction damping should not be used where deflecting torque in the instrument is produced due to. None of these. Can be used only.

Air friction damping should not be used where the deflecting torque in the instrument is produced due toi. The air friction damping is very simple and cheap. It can be used only for vertical position.

D a or b Ans. This method is used in moving iron and hot wire instruments. Which type of instrument is used with air friction damping.

Thermo electric emf Option-4. This method is used in moving iron and hot wire instruments. B Very low magnetic field.

Air friction damping is used. 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. The air fraction damping is used for the instruments which have.

Electrical and electronics measurements miscellaneous. Moving-iron instruments are generally used to measure alternating voltages and currents. PMMC type instruments normally use a Air friction damping b Fluid friction damping c Eddy current damping d None of the above.

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. Magnetic field Option-2. Fluid friction damping has an advantage that the oil can be used for damping as in oil.

If the instrument scale is cramped for large values then the scale is calibrated as per. It is the best-suited method for electrostatic type instruments. The type of damping used for moving iron instruments is.

Electrical and Electronics Measurements. C Zero magnetic field. None of the above.

Eddy current damping is used. PMMC type instruments normally use a Air friction damping b Fluid friction damping c Eddy current damping d None of the above. A Very high magnetic field.

The action is the same as in the air friction damping. The oil used serves two purposes one is for damping and the other is for heat dissipation. Air friction damping should not be used where the deflecting torque in the instrument is produced due to Options.

It provides effective damping when compared to air friction type. Electrostatic field Option-3. But care must be taken to ensure that the piston is not bent or twisted.

Air friction damping is used in these instruments and may be either piston type or vane type. This method is suited for electrostatic instruments where the movement is suspended rather pivoted. Indicating Instruments MCQ Quiz Objective Question with Answer for Indicating Instruments Download Free PDFIndicating Instruments MCQ Question 1Download Solution PDFThe type damping use for moving iron instruments Air friction dampingFluid friction dampingEddy current dampingGravity friction dampingAnswer Detailed.

Air friction damping should not be used where the deflecting torque in the instrument is produced due to.

Engineering Notes Damping System And Its Types