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moving iron instruments
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∙ 9y ago
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What do you mean by torque weight ratio of an indicating instrument?
torque/weight ratio of an instrument indicates sensitivity.if a pointer is having less weight, it will be having high torque/weight ratio so that even for a very small deflection pointer starts moving and indicates measured value.
What is the Difference between dynamo meter type watt meter and simple watt meter?
S. No.Dynamometer Type WattmetersInduction Type Wattmeters1.The instrument can be used on both dc and ac systems.The instrument cannot be used on dc system.2.The instrument can have high degree of accuracy.If carefully designed.The instrument is less accurate. It is accurate only at stated frequency and temperature3.Power consumption is comparatively low.Power consumption is comparatively higher4.Weight of moving system is comparatively low.Weight of moving system is comparatively higher5.The instrument has uniform scale.The instrument has uniform and long scale6.The instrument has comparatively weaker working torque.The instrument has comparatively stronger working torque.
What is the difference between electromagnetic torque and load torque in electrical machines?
Electromagnetic torque and load torque are different.Electromagnetic torque is the torque that is produced inside the machine which makes the machine rotate,while load torque is the torque that is applied externally with brake drum and and spring balance.Electromagnetic torque can be varied by varying the speed of the machine,but load torque is fixed.
What is the derivation of Torque and power equation of induction motor?
Torque is the cross product of radius and force .Torque is a twisting effect. Torque is the cross product of radius and force .Torque is a twisting effect.
Why pmmc instrument measure only ac not dc?
Permanent magnet moving coil instruments are used for measuring d.c. quantities only. This is so because for these instruments the torque is proportional to the operating quantity either voltage or current.
Definition of PMMC instrument?
An ammeter or other electrical instrument in which a small coil of wire, supported on jeweled bearings between the poles of a permanent magnet, rotates when current is carried to it through spiral springs which also exert a restoring torque on the coil; the position of the coil is indicated by an attached pointer.
The instrument use in measuring force?
force gages, torque gages
What do you mean by torque weight ratio of an indicating instrument?
torque/weight ratio of an instrument indicates sensitivity.if a pointer is having less weight, it will be having high torque/weight ratio so that even for a very small deflection pointer starts moving and indicates measured value.
What do you mean by restoring torque?
OK let an example to understand the restoring torque.....let an iron piece of material and wound it with an metallic wire and as the metallic wire is connect with an 2 pole in which there is a magnetic bar is placed ....now supply on and due to the electromagnetic induction process the bar is displace...their position... as the 2 pole is consider as the north pole and the south pole ...so when bar is displace..then if it want to attains their original.....position then the force it require called as the restoring force....
What is restoring couple?
Restoring couple=as the coil turns under the action of deflecting torque,the suspension wire is twisted which give rise to torsional couple,which tends to untwist the suspension wire and restore the original position. This couple is known as restoring couple.. Restoring couple =t=C Φ
Is a torque wrench a precision instrument?
Yes, a torque wrench is a precision instrument (or tool). -If damaged or even slightly bent it may give incorrect readings. It should always be kept in a separate case or box, nut just flung in a toolbox with over heavy tools (as I sometimes see)
How does a moving iron loudspeaker work?
Typical scheme of measuring el. current and voltageThe deflecting torque in any moving-iron instrument is due to forces on a small piece of magnetically 'soft' iron that is magnetized by a coil carrying the operating current. In repulsion type moving-iron instrument consists of two cylindrical soft iron vanes mounted within a fixed current-carrying coil. One iron vane is held fixed to the coil frame and other is free to rotate, carrying with it the pointer shaft. Two irons lie in the magnetic field produced by the coil that consists of only few turns if the instrument is an ammeter or of many turns if the instrument is a voltmeter.Current in the coil induces both vanes to become magnetized and repulsion between the similarly magnetized vanes produces a proportional rotation. The deflecting torque is proportional to the square of the current in the coil, making the instrument reading is a true 'RMS' quantity Rotation is opposed by a hairspring that produces the restoring torque. Only the fixed coil carries load current, and it is constructed so as to withstand high transient
Is stress the applied or restoring force?
restoring force
What is the ISBN of Restoring the Lost Constitution?
The ISBN of Restoring the Lost Constitution is 0691115850.
When was Restoring the Lost Constitution created?
Restoring the Lost Constitution was created in 2003.
Transmission gate is non restoring or full restore logic?
Non restoring
What do you do if your computer is restoring and becomes stuck?
Try restoring again. If it still doesn't work, restart the computer in safe mode and try restoring again.
