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The path of magnetic flux in a transformer should have?
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The path of magnetic flux in a transformer should have low reluctance.

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

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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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The unit of magnetic flux is?

Answer :

The unit of magnetic flux is weber.

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Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.

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The chemical used in breather for transformer should have the quality of cleansing the transformer oil.

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What is the permissible flux density in case of cold rolled grained oriented steel?

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The permissible flux density in case of cold rolled grained oriented steel is 1.7 Wb/m2.

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A material for good magnetic memory should have?

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A material for good magnetic memory should have high retentivity.

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Interpole flux should be sufficient to neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil.

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The leakage flux in a transformer depends upon load current.

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The value of flux involved in the e.m.f. equation of a transformer is maximum value.

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The use of higher flux density in the transformer design reduces weight per kVA.

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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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In a transformer the resistance between its primary and secondary should be?

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In a transformer the resistance between its primary and secondary should be infinity.

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Description :

The path of the magnetic flux in a transformer has : (A) High reluctance (B) Low resistance (C) High conductivity (D) Low reluctance

Answer :

low reluctance path

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State why a transformer always have an efficiency of more than 90%.

Answer :

As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.

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An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

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A transformer can have regulation closer to zero on leading power factor.

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In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

Answer :

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator 

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In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

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In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth

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Flux density formula

Answer :

Flux density formula

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Define the following terms and state their units: (i) Luminous intensity, (ii) Luminous flux

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i) Luminous intensity: This is defined as the luminous flux emitted into a solid angle of space in a specific direction. Its unit is the candela.  OR  The luminous flux per unit solid angle ( ... energy radiated by the light source in all direction. The unit of luminous flux is lumen (lm) 

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Describe the concept of leakage flux, useful flux and fringing with neat diagram.

Answer :

Leakage Flux

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Define useful flux, leakage flux and fringing.

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Explain the leakage flux and its effect with the help of neat diagram.

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It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its .......... is held constant.

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It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its armature current is held constant.

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If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by Blv.

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Flux density is denoted by B. And it is given as B = flux/ area Where, the unit of flux is Weber and unit of area is meter square. So the unit of flux density is weber per meter square which is also called as Tesla.

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The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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High voltage winding in a transformer has more number of turns.

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The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

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In a transformer, routine efficiency depends upon load current and power factor of load.

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In a transformer, the tappings are generally provided on low voltage side.

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The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.

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conservator or a reservoir tank for insulating oil in transformer which used for balanced the onload oil level with help of oil level indicator which mount on middle part of reservoir tank.

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The main reason for generation of harmonics in a transformer could be saturation of core.

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Noise level test in a transformer is a type test.

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The function of breather in a transformer is to arrest flow of moisture when outside air enters the transformer.

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In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.

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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

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If a transformer is continuously operated the maximum temperature rise will occur in?

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If a transformer is continuously operated the maximum temperature rise will occur in windings.

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The hum in a transformer is mainly attributed to?

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The hum in a transformer is mainly attributed to magnetostriction.

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In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

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In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.

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In the transformer low voltage winding has got more cross-sectional area.

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