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Define magnetic susceptibility.
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Description :

The magnetic susceptibility of paramagnetic material is: A) Less than zero B) Less than one but positive C) Greater than one D) Equal to zero

Answer :

The magnetic susceptibility of paramagnetic material is: Less than one but positive

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Description :

Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.

Answer :

Magnetic Lines of force- These are the imaginary lines (having no physical existence) introduced by Faraday for the pictorial representation of the distribution of a magnetic field.  OR  A line of ... that the tangent at any point gives direction of the resultant force at that point. 

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Description :

What is the value of susceptibility in case of vacuum? A) 1 B) 0.5 C) ∞ D) 0 

Answer :

What is the value of susceptibility in case of vacuum? A) 1 B) 0.5 C) ∞ D) 0 

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Answer :

Susceptibility of the air medium is zero.

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Description :

Define polarization.

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Description :

Define magnetic permeability. State and explain the factors affecting permeability of magnetic materials

Answer :

Permeability : The capability of the magnetic material to conduct the magnetic flux is known as permeability. Permeability and hysteresis loss are inversely related to each other. Factors ... impurities affect the geometric pattern of the crystals and are harmful to the magnetic property. 

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Description :

Define the following terms: i) Magnetic flux density, ii) Reluctance, iii) Magneto-motive force, iv) Permeance.

Answer :

(i) Magnetic flux density (B): It is the magnetic flux per unit area measured at right angles to the flux path. (Its unit is weber/m2 or tesla).  (ii) Reluctance: It is the ... flux to set up through it and it is reciprocal of reluctance. Permeance = 1/ Reluctance. Unit: weber/ampere.

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Description :

Define magnetic circuit. Draw simple series magnetic circuit.

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Description :

Define magnetic flux density and state its formula.

Answer :

The magnetic flux per unit area is called as magnetic flux density. Magnetic flux density is denoted by B. The formula for magnetic flux density is Weber per metre square or Tesla. Mathematically ... the unit of magnetic flux density is Weber per metre square which is also called as Tesla.

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Description :

Define magnetic field strength and state its unit.

Answer :

Magnetic field strength is the force experienced by a unit N-pole when placed at any point in a magnetic field is known as magnetic field strength or magnetizing force. Magnetising force or magnetic field ... unit of length is metre. So the unit of magnetic field strength is ampere turns per metre.

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Description :

Define magnetic lines of force. Show the magnetic lines of force for bar type magnet.

Answer :

Magnetic linens of force is the imaginary lines for magnetic field of magnet around it. These magnetic lines of forces are introduced by Michael Faraday. The direction of lines of force is from N-pole to S-pole. The figure shows lines of force for bar type magnet.

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Description :

Magnetic and Non-magnetic Materials

Answer :

We have now looked at a number of ways in which matter can be grouped, such as into metals, semi-metals and non-metals; electrical conductors and insulators, and thermal conductors and insulators. ... information must be stored, in computers and TV's, as well as in generators and electric motors.

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Description :

Why does the magnetic field flow from north to south?

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Description :

State the material used for making (1) Magnetic Core (2) Fuse element  

Answer :

The material used for making of:  (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel  (2) Fuse Element: Tin- lead wire, Tinned copper wire 

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Description :

Electro Magnetic Induction

Answer :

Electro Magnetic Induction

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Description :

Why does leakage occur in a magnetic circuit?

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Description :

Why is it necessary to keep air gaps in magnetic circuits as small as possible?

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Description :

Explain with neat diagram series and parallel magnetic circuits. 

Answer :

Series magnetic circuit: When different magnetic materials having different lengths, cross sectional areas and permeability are connected one after another, in which same flux is established in different sections, then it is called series ... flux, Φ = Φ1 + Φ2  Path 1: BAFE  Path 2: BACD

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Description :

Series Magnetic Circuits

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Description :

Important Terms in Magnetic Circuit

Answer :

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Description :

Magnetic Circuit and its Analysis

Answer :

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Description :

A magnetic circuit has effective iron length of 100 cm and it is wound with 800 turns of wire carries 1 A. Find the magnetic field strength.

Answer :

magnetic field strength

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Description :

What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.

Answer :

1. Error due to stray magnetic fields-   Main magnetic field gets disturbed by external magnetic fields known as stray magnetic fields.  2. Compensation technique   To avoid this error, ... resistance alloy having a negligible resistance temp coefficient in the ratio of 1:10 for pressure coil 

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Description :

Explain magnetic effect employed in measuring instrument.

Answer :

Magnetic Effect:  I) In PMMC meters:  ➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current ... field it experiences a mechanical force.  Examples: Electrodynamometer type instruments, Induction type instrument. 

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Description :

Derive an expression for energy stored in a magnetic field . 

Answer :

Expression for energy stored in a magnetic field: The energy is stored in magnetic field when current increases and return back when the current decreases. At instant t' seconds after closer of switch ... energy absorbed by the magnetic field when current increases from 0 to I amperes 

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Description :

What is magnetic hysteresis? What is the cause of hysteresis?

Answer :

Magnetic hysteresis: When a magnetic material is subjected to cycle of magnetization, it is found that flux density (B) in the material lags behind applied magnetizing force (H). This ... the movement of orientation, due to which the flux density lags behind the magnetic field intensity.

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Description :

Classify magnetic materials and explain in brief.

Answer :

.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { ... the absence of external magnetic field. Following are the ferromagnetic materials: Iron, Cobalt, Nickel.

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Description :

State and explain Ohm's law for magnetic circuit.

Answer :

Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) ... . Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.

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Description :

Compare electric and magnetic circuit.

Answer :

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Description :

Give the relation between magnetic field strength, magnetic flux density and permeability.

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Description :

Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above

Answer :

Magnetic circuit breakers use Solenoid 

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Description :

Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

Answer :

Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

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Description :

What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

Answer :

What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

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Description :

Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these

Answer :

Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these

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Description :

The magnetic permeability of a diamagnet is _________ A) More than that of vacuum B) Same as that of vacuum C) Less than that of vacuum D) 3.14 times that of vacuum

Answer :

The magnetic permeability of a diamagnet is Less than that of vacuum 

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Description :

The magnetic neutral plane shifts in a dc machine (A) in the direction of motion of motor (B) in the direction of motion of generator (C) due to increase in the field flux (D) cause reduction of flash over between commutator segments

Answer :

The magnetic neutral plane shifts in a dc machine in the direction of motion of generator

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Description :

Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

Answer :

Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

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Description :

The property of a material which opposes the creation of magnetic flux in it is known as?

Answer :

The property of a material which opposes the creation of magnetic flux in it is known as reluctance.

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Description :

In a magnetic material hysteresis loss takes place primarily due to?

Answer :

In a magnetic material hysteresis loss takes place primarily due to it high retentivity.

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Description :

A material for good magnetic memory should have?

Answer :

A material for good magnetic memory should have high retentivity.

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Description :

Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.

Answer :

Those magnetic materials are best suited for making armature and transformer cores which have high permeability and low hystersis loss.

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Description :

Permeability in a magnetic circuit corresponds to______ in an electric circuit.

Answer :

Permeability in a magnetic circuit corresponds to conductivity in an electric circuit.

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Description :

The unit of magnetic flux is?

Answer :

The unit of magnetic flux is weber.

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Description :

An air gap is usually inserted in magnetic circuits to?

Answer :

An air gap is usually inserted in magnetic circuits to prevent saturation.

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Description :

Answer :

To avoid the effect of stray magnetic field in A.C. bridges we can use magnetic screening.

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Description :

Answer :

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when there is no load on|he generator.

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Description :

Answer :

Magnetic field in a D.C. generator is produced by electromagnets.

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Description :

Answer :

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.

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Description :

Answer :

The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.

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Description :

Answer :

Magnetic circuit breaker has instantaneous trip action.

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