# Permanent magnet moving coil instruments are used for

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Permanent magnet moving coil instruments are used for

Permanent magnet moving coil instruments are used for DC

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PMME are mostly used for measuring voltage and current.

## Related questions

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

State the material used for moving coil and former for PMMC instruments.

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 V. If the resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is (A) 150 (B) 100 (C) 50 (D) 200

What is permanent magnet and electromagnet?

A neodymium magnet is a permanent magnet made from an alloy of _________ A) Neodymium and iron B) Neodymium, iron and iodine C) Neodymium and boron D) Neodymium, iron and boron

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is

Eddy current damping cannot be used for moving iron instrument because

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Peterson coil is used for :  (A) shunt compensation of lines (B) grounding of system neutral (B) reduce fault currents (D) connecting interconnected systems

Two voltmeters of same range, one moving iron type and other permanent magnet moving coil type, are connected in parallel for measuring a.c. supply voltage. If the reading of MI type is 300V, the reading of PMMC type will be (a) zero (b) higher-than M.I. type (c) lower than M.I. type (d) same

A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD) current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is:

Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity.

The main sources of Errors in Permanent Magnet moving Coil (PMMC) are due to : - a) weaking of the permanent magnet due to aging at temperature effects b) weaking of spring due to aging and temperature effects c) change of resistance of the moving coil with temperature d) all the above

How instruments are classified?

Permanent magnets are normally made of?

Hard steel is suitable for making permanent magnets because?

What do you mean by secondary instruments?

What is electrical instruments?

List out any four effects of electric current used in measuring instruments & write name of meter working on it.

The self inductance of a coil can be measured using (A) Wien’s Bridge (B) Schering Bridge (C) Anderson’s Bridge (D) Wheatstone Bridge

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

List three types of errors in measuring instruments. Give reasons of occurring for any one of them.

Standard Commands for Programmable Instruments (SCPI)

lt the length, number of turns and area of a coil are  doubled, the inductance of the coil

Explain the essential toques in analog type measuring instruments.

State two purposes of calibration of measuring instruments.

State the meaning of secondary instrument. Classify secondary instruments.

Define following terms related to measuring instruments: i) Sensitivity ii) Selectivity.

Describe systematic errors in measuring instruments.