The coil of a moving coil meter is would on

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The coil of a moving coil meter is would on An aluminium frame.

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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 device which converts chemical energy into electrical energy is called -----? A. motor B. generator C. moving-coil meter D. battery (Answer)

Description : A device which converts chemical energy into electrical energy is called -----? A. motor B. generator C. moving-coil meter D. battery (Answer)

Last Answer : D. battery (Answer)

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned

Description : 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

Last Answer : 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 200µNm

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up

Description : 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

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A moving coil instrument is used as an ohmmeter. The indicating scale of the meter will be

Last Answer : A moving coil instrument is used as an ohmmeter. The indicating scale of the meter will be Hyperbolic.

In a dynamo-meter type of moving coil instrument a swamping resistance is provided in order to:

Last Answer : In a dynamo-meter type of moving coil instrument a swamping resistance is provided inorder to: Provide equal time constant for moving coil and fixed coil, when used for ac measurement

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.

The current coil of a single-phase energy meter is wound on

Description : The current coil of a single-phase energy meter is wound on (a) One limb of the laminated core (b) Both the limbs of the laminated core with same number of turns (c) Both the limbs of the laminated core with different number of turns (d) The centre of the limb on the laminated core

Last Answer : The current coil of a single-phase energy meter is wound on Both the limbs of the laminated core with same number of turns

The series magnet of a single phase Energy meter consists of coil of _____.

Last Answer : The series magnet of a single phase Energy meter consists of coil of thick wire of few turns.

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.

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

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

Last Answer : Material Used for Moving Coil and Former for PMMC Instruments:  Material used for moving coil: Copper  Material used for Former: Aluminium

A moving coil instrument of resistance 5 Ohm requires a potential difference of 75 mV to give a full scale...

Description : A moving coil instrument of resistance 5 Ohm requires a potential difference of 75 mV to give a full scale deflection. The value of shunt resistance needed to give a full scale deflection at 30 A is

Last Answer : A moving coil instrument of resistance 5 Ohm requires a potential difference of 75 mV to give a full scale deflection. The value of shunt resistance needed to give a full scale deflection at 30 A is 2.5 milliOhm

Dynamometer type moving coil instruments are provided with _____.

Last Answer : Dynamometer type moving coil instruments are provided with pneumatic damping

Why the the reading on the newton meter increases when a current passes through the coil?

Description : Why the the reading on the newton meter increases when a current passes through the coil?

Last Answer : dadsd

When a resistor is used as a shunt and is connected in parallel with a meter movement coil, it will provide _____________. A. a measurement of circuit resistance B. an increased accuracy of approximately 1.5 percent C. an extended meter range D. none of the above

Description : When a resistor is used as a shunt and is connected in parallel with a meter movement coil, it will provide _____________. A. a measurement of circuit resistance B. an increased accuracy of approximately 1.5 percent C. an extended meter range D. none of the above

Last Answer : Answer: C

Which of the instruments listed could be use to locate a grounded field coil in a synchronous motor? A. Ammeter B. Voltmeter C. Megohmmeter D. Frequency meter

Description : Which of the instruments listed could be use to locate a grounded field coil in a synchronous motor? A. Ammeter B. Voltmeter C. Megohmmeter D. Frequency meter

Last Answer : Answer: C

The basic meter movement responds to the flow of current through its coil. Therefore, this meter movement may be used as a/an _____________. A. voltmeter by placing a resistance in parallel with the coil B. ohmmeter by placing another meter movement in parallel with the coil C. wattmeter by placing a battery in parallel with the coil D. ammeter by placing a low resistance in parallel with the coil

Description : The basic meter movement responds to the flow of current through its coil. Therefore, this meter movement may be used as a/an _____________. A. voltmeter by placing a resistance in parallel with the ... in parallel with the coil D. ammeter by placing a low resistance in parallel with the coil

Last Answer : Answer: D

A testing device called a 'growler' is being used to locate a shorted coil in the stator of an AC electrical machine. When the 'feeler' is moved over a slot containing the shorted coil _____________. A. a loud growling noise will be heard B. any vibration within the feeler will cease C. the meter needle will be deflected to zero D. the meter needle will be deflected to full-scale

Description : A testing device called a 'growler' is being used to locate a shorted coil in the stator of an AC electrical machine. When the 'feeler' is moved over a slot containing the shorted coil _____________. ... . the meter needle will be deflected to zero D. the meter needle will be deflected to full-scale

Last Answer : Answer: A

Which of the listed instruments can be best used to locate a grounded field coil in a synchronous motor? A. Frequency meter B. Megohmmeter C. Voltmeter D. Multimeter

Description : Which of the listed instruments can be best used to locate a grounded field coil in a synchronous motor? A. Frequency meter B. Megohmmeter C. Voltmeter D. Multimeter

Last Answer : Answer: B

What is the effect of current flow through the coil in a d’Arsonval meter movement?

Description : What is the effect of current flow through the coil in a d’Arsonval meter movement?

Last Answer : A magnetic field is generated around the coil and the attraction of this field with the permanent magnet causes the coil to move

(True or False) The larger the current required to produce full-scale deflection of the meter coil, the better the sensitivity of the meter.

Description : (True or False) The larger the current required to produce full-scale deflection of the meter coil, the better the sensitivity of the meter.

Last Answer : False.

What component supplies restoring force to the coil of the D’Arsonval meter movement?

Description : What component supplies restoring force to the coil of the D’Arsonval meter movement?

Last Answer : Hairspring.

What component of the D’Arsonval meter movement completes the circuit for current flow to the coil?

Description : What component of the D’Arsonval meter movement completes the circuit for current flow to the coil?

Last Answer : Hairspring.

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.

The multiplier and the meter coil in a voltmeter are in?

Last Answer : The multiplier and the meter coil in a voltmeter are in series.

The coil of a moving coil galvanometer has an effective area of 4xx10^(-2)m^(2)`. It is suspended in a magnetic field of `5xx10^(-2)` Wb `m^(-2)`. If

Description : The coil of a moving coil galvanometer has an effective area of 4xx10^(-2)m^(2)`. It is suspended in a magnetic field of `5xx10^(-2)` Wb `m^(-2)`. If

Last Answer : The coil of a moving coil galvanometer has an effective area of 4xx10^(-2)m^(2)`. It is suspended in a ... D. current sensitivity is `40 deg` `A^(-1)`

In order to increase the sensitivity of a moving coil galvanometer, one should decrease

Description : In order to increase the sensitivity of a moving coil galvanometer, one should decrease

Last Answer : In order to increase the sensitivity of a moving coil galvanometer, one should decrease A. the strength of ... in its coil D. the area of its coil

In a moving coil galvanometer, the deflection of the coil q is related to the electrical current i by the relation

Description : In a moving coil galvanometer, the deflection of the coil q is related to the electrical current i by the relation

Last Answer : In a moving coil galvanometer, the deflection of the coil q is related to the electrical current i by the ... theta^(2)` D. `I prop sqrt(theta)`

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10-divisions per milliampere and voltage sensitivity is 2 divisions per

Description : A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10-divisions per milliampere and voltage sensitivity is 2 divisions per

Last Answer : A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10-divisions per milliampere and voltage ... `10^(3)` D. `10^(5)`

A moving coil galvanometer is converted into an ammeter reads upto `0.03 A` by connecting a shunt of resistance `4r` across it and ammeter reads up `0

Description : A moving coil galvanometer is converted into an ammeter reads upto `0.03 A` by connecting a shunt of resistance `4r` across it and ammeter reads up `0

Last Answer : A moving coil galvanometer is converted into an ammeter reads upto `0.03 A` by connecting a shunt of resistance `4r` ... `0.02A` C. `0.03A` D. `0.04A`

To send 10% of the main current through a moving coil galvanometer of resistance `99omega`, the shunt required is –

Description : To send 10% of the main current through a moving coil galvanometer of resistance `99omega`, the shunt required is –

Last Answer : To send 10% of the main current through a moving coil galvanometer of resistance `99omega`, the shunt ... `11Omega` C. `10Omega` D. `9.9Omega`

To limit the current flow through a DC voltmeter to as low a value as possible, the moving coil circuit is provided with a/an _____________. A. high series resistance B. high parallel resistance C. series inductor D. external shunt

Description : To limit the current flow through a DC voltmeter to as low a value as possible, the moving coil circuit is provided with a/an _____________. A. high series resistance B. high parallel resistance C. series inductor D. external shunt

Last Answer : Answer: A

: Moving a coil in and out of magnetic field induces A. force B. potential difference C. e.m.f D. voltage

Description : : Moving a coil in and out of magnetic field induces A. force B. potential difference C. e.m.f D. voltage

Last Answer : e.m.f

In generators, the rate of change of flux linkage is maximum when the coil is moving through the A. vertical position B. horizontal position C. diagonal position D. at an angle of 45

Description : In generators, the rate of change of flux linkage is maximum when the coil is moving through the A. vertical position B. horizontal position C. diagonal position D. at an angle of 45

Last Answer : horizontal position

Explain the construction and working of moving coil instrument.

Description : Explain the construction and working of moving coil instrument.

Last Answer : Construction: The moving part is a coil wound on a light aluminium frame, mounted on a shaft made of stainless steel which is pivoted at either ends on jewel bearing made of sapphire. The coil is placed between ... . Where B is magnetic flux, N is number of turns and L is length of coil. 

Moving coil in dynamometer wattmeter connected a) In series with fixed coil b) Across supply c) In series with load d) Across load

Description : Moving coil in dynamometer wattmeter connected a) In series with fixed coil b) Across supply c) In series with load d) Across load

Last Answer : Ans: Across supply

What is the mathematical formula for computing the output voltage from a moving coil in a magnetic field?

Description : What is the mathematical formula for computing the output voltage from a moving coil in a magnetic field?

Last Answer : 8. e = Emax sine θ.

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

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

Permanent-magnet moving coil instrument can be used in

Description : Permanent-magnet moving coil instrument can be used in

Last Answer : dc work only

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 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

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

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

The induced current can be increased by: a. Using strong magnetic field b. moving loop faster c. Replacing loop by coil d. all of above

Description : The induced current can be increased by: a. Using strong magnetic field b. moving loop faster c. Replacing loop by coil d. all of above

Last Answer : d. all of above

The pole faces of U-shaped magnet in a moving coil galvanometer are made concave to a) decrease the strength of magnetic field b) create a non-uniform magnetic field c) make the magnetic field radial d) All of these

Description : The pole faces of U-shaped magnet in a moving coil galvanometer are made concave to a) decrease the strength of magnetic field b) create a non-uniform magnetic field c) make the magnetic field radial d) All of these

Last Answer : c) make the magnetic field radial

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 :

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