Permanent-magnet moving coil instrument can be used in

Permanent-magnet moving coil instrument can be used in
by

1 Answer

Answer :

dc work only
by

Related questions

What is the reason why the scale of a permanent-magnet moving coil instrument is uniform?

Description : What is the reason why the scale of a permanent-magnet moving coil instrument is uniform?

Last Answer : because it is spring controlled

Current range extension in moving coil instruments can be achieved by placing a ___ in shunt with the instrument.

Description : Current range extension in moving coil instruments can be achieved by placing a ___ in shunt with the instrument.

Last Answer : low resistance resistor

What is the typical full-scale deflection current of a moving coil instrument?

Description : What is the typical full-scale deflection current of a moving coil instrument?

Last Answer : 50mA

Permanent Magnet Moving Coil (PMMC) Instrument

Description : Permanent Magnet Moving Coil (PMMC) Instrument

Last Answer : Permanent Magnet Moving Coil (PMMC) Instrument

A permanent magnet moving coil instrument gives full scale deflection of 25mA when a voltage of 75mV is applied across it. Calculate: (i) Resistance of shunt required for full scale deflection of 150 A. (ii) Series resistance for full scale deflection of 500 V.

Description : A permanent magnet moving coil instrument gives full scale deflection of 25mA when a voltage of 75mV is applied across it. Calculate: (i) Resistance of shunt required for full scale deflection of 150 A. (ii) Series resistance for full scale deflection of 500 V.

Last Answer : Answer :

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

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

Last Answer : (i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

A moving-coil permanent-magnet instrument can be used as flux-meter?

Last Answer : A moving-coil permanent-magnet instrument can be used as flux-meter by eliminating the control springs.

A moving-coil permanent-magnet instrument can be used as what by using a low resistance shunt?

Last Answer : A moving-coil permanent-magnet instrument can be used as ammeter by using a low resistance shunt.

How can electric currents be induced with a coil and a magnet?

Description : How can electric currents be induced with a coil and a magnet?

Last Answer : by moving either the magnet or the coil

What is the device, which depends on the action of a movalbe permanent magnet, in aligning itself in the resultant field produced by a fixed permanent magnet or current- carrying coils whose axes are displaced by a fixed angle?

Description : What is the device, which depends on the action of a movalbe permanent magnet, in aligning itself in the resultant field produced by a fixed permanent magnet or current- carrying coils whose axes are displaced by a fixed angle?

Last Answer : moving-magnet instrument

An instrument of device having recognized permanent of stable value that is used as a reference.

Description : An instrument of device having recognized permanent of stable value that is used as a reference.

Last Answer : standard instrument/device

A small swamping resistance is connected in series with operating coil of a moving coil ammter in order to compensate for the effects of ____

Description : A small swamping resistance is connected in series with operating coil of a moving coil ammter in order to compensate for the effects of ____

Last Answer : temperature variation

In a moving coil ammeter, a ___ is connected in series with the coil to compensate for temperature variations

Description : In a moving coil ammeter, a ___ is connected in series with the coil to compensate for temperature variations

Last Answer : swamping resistors

Meters with moving coil are normally used for measuring ____

Description : Meters with moving coil are normally used for measuring ____

Last Answer : dc only

What is the typical full-scale voltage across a moving coil voltmeter?

Description : What is the typical full-scale voltage across a moving coil voltmeter?

Last Answer : 50mV

Moving-iron instrument has a/an scale

Description : Moving-iron instrument has a/an scale

Last Answer : squared

As the deflection of the moving system increases, the controlling torque in an indicating instrument.

Description : As the deflection of the moving system increases, the controlling torque in an indicating instrument.

Last Answer : increases

A force in analog instrument which quickly brings the moving system to rest in its final position.

Description : A force in analog instrument which quickly brings the moving system to rest in its final position.

Last Answer : damping force

Which of the following electric meter movements uses a stationary permanent magnet and movable coil? A. D'Arsonval B. Electrodynamometer C. Moving iron-vane D. Inclined coil iron-vane

Description : Which of the following electric meter movements uses a stationary permanent magnet and movable coil? A. D'Arsonval B. Electrodynamometer C. Moving iron-vane D. Inclined coil iron-vane

Last Answer : Answer: A

A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD)

Description : 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:

Last Answer : 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: 0.05mA

Permanent magnet moving coil instruments are used for

Description : Permanent magnet moving coil instruments are used for

Last Answer : PMME are mostly used for measuring voltage and current.

The main sources of Errors in Permanent Magnet moving Coil (PMMC) are due to : -

Description :  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

Last Answer :  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

A galvanometer with 20 ohms coil resistence has a full-scale deflection of 10 mA. A 0.02 ohm is placed across the meter to increase its rating capacity. What is the new full scale current for the meter?

Description : A galvanometer with 20 ohms coil resistence has a full-scale deflection of 10 mA. A 0.02 ohm is placed across the meter to increase its rating capacity. What is the new full scale current for the meter?

Last Answer : False.

A dynamometer instrument is mainly used as a/an

Description : A dynamometer instrument is mainly used as a/an

Last Answer : wattmeter

The scale of a hot-wire instrument is a/an ___function

Description : The scale of a hot-wire instrument is a/an ___function

Last Answer : squared

What is an electronic instrument capable of showing on screen and maybe on print, relative spacing of transmitter carriers, their sidebands and harmonics?

Description : What is an electronic instrument capable of showing on screen and maybe on print, relative spacing of transmitter carriers, their sidebands and harmonics?

Last Answer : Spectrum Analyzer

A device or instrument, which delivers signals of precise frequency and amplitude, usually over a wide range

Description : A device or instrument, which delivers signals of precise frequency and amplitude, usually over a wide range

Last Answer : signal generators

When both deflecting and controlling torque act, the pointer of an indicating instrument comes to

Description : When both deflecting and controlling torque act, the pointer of an indicating instrument comes to

Last Answer : rest

The smallest change in a measured variable to which an instrument will respond.

Description : The smallest change in a measured variable to which an instrument will respond.

Last Answer : resolution

In RF and microwave system, what instrument is used to measure the incidental and reflected signals?

Description : In RF and microwave system, what instrument is used to measure the incidental and reflected signals?

Last Answer : reflectometer

This instrument measures temperatures by electric means, especially temperatures beyong the range of mercury thermometers

Description : This instrument measures temperatures by electric means, especially temperatures beyong the range of mercury thermometers

Last Answer : pyrometer

Which instrument is the most sensitive?

Description : Which instrument is the most sensitive?

Last Answer : permanen-magnet moving coil

A device or instrument able to generate noise with accurate voltage for test purposes

Description : A device or instrument able to generate noise with accurate voltage for test purposes

Last Answer : noise generator

Resistance measuring instrument particularly used in determining the insulation resistance

Description : Resistance measuring instrument particularly used in determining the insulation resistance

Last Answer : Megger/Megaohmmeter

What is that instrument used for measuring the strength and direction of magnetic fields?

Description : What is that instrument used for measuring the strength and direction of magnetic fields?

Last Answer : magnetometer

Majority of analog measuring instrument utilizes one of the following effects.

Description : Majority of analog measuring instrument utilizes one of the following effects.

Last Answer : magnetic effect

Determine which is not a dynamic instrument

Description : Determine which is not a dynamic instrument

Last Answer : Logic

What do you call of an instrument that depends for its operation on the reaction between magnetic flux set up by currents in fixed windings and other currents set up by electromagnet induction in movable conducting parts?

Description : What do you call of an instrument that depends for its operation on the reaction between magnetic flux set up by currents in fixed windings and other currents set up by electromagnet induction in movable conducting parts?

Last Answer : induction instrument

An electro pyrometer is an instrument used to measure?

Description : An electro pyrometer is an instrument used to measure?

Last Answer : high temperatures

An instrument used to detect and measure the presence of electrical current is generally called

Description : An instrument used to detect and measure the presence of electrical current is generally called

Last Answer : galvanometer

An indicating instrument whose movable coils rotate between two-stationary coils, usually used as wattmeter

Description : An indicating instrument whose movable coils rotate between two-stationary coils, usually used as wattmeter

Last Answer : electrodynamometer

A tunable RF instrument, which, by means of a sharp dip of an indicating meter, indicates resonance with an external circuit under test

Description : A tunable RF instrument, which, by means of a sharp dip of an indicating meter, indicates resonance with an external circuit under test

Last Answer : dip meter

Basically, a PMMC instrument can be used only in

Description : Basically, a PMMC instrument can be used only in

Last Answer : dc measurements

Another name for PMMC instrument

Description : Another name for PMMC instrument

Last Answer : D'Arsonval

If the pointer of an indicating instrument is in motion, then what opposes deflecting torque?

Description : If the pointer of an indicating instrument is in motion, then what opposes deflecting torque?

Last Answer : damping and controlling torque

What is the force acting on the pointer of an indicating instrument when it is in motion?

Description : What is the force acting on the pointer of an indicating instrument when it is in motion?

Last Answer : controlling, damping and deflecting torques

What is this instrument or circuit that has four or more arms, by means of which one or more of the electrical constance of an unknown component may be measured?

Description : What is this instrument or circuit that has four or more arms, by means of which one or more of the electrical constance of an unknown component may be measured?

Last Answer : bridge

Dynamometer type instrument can be used for

Description : Dynamometer type instrument can be used for

Last Answer : both dc and ac works

Indicating instrument is assumed to be most accurate at what part of the scale?

Description : Indicating instrument is assumed to be most accurate at what part of the scale?

Last Answer : at half or full

An instrument in which the magnitude of the measured quantity is indicated by means of pointer.

Description : An instrument in which the magnitude of the measured quantity is indicated by means of pointer.

Last Answer : analog instrument