How eddy currents are generated?

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asked Mar 14, 2018 by anonymous

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asked Mar 20, 2018 by anonymous

Eddy currents are induced in the pole shoes of a D.C. machine due to?

Last answer: Eddy currents are induced in the pole shoes of a D.C. machine due to relative rotation between field and armature.

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Last answer: An electric current produced by means of electrical machine is known as generator which converts mechanical energy into electrical energy. When conductor cuts the magnetic flux, emf induced in it. (Faraday' ... upon position of armature. The nature of emf is alternating as shown by the waveform.

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The transient currents are associated with the?

Last answer: The transient currents are associated with the changes in the stored energy in the inductors and capacitors.

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asked Mar 15, 2018 by anonymous

How eddy current can be minimized?

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asked Mar 15, 2018 by anonymous

How eddy current is produced in a transformer?

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asked Mar 21, 2018 by anonymous

For handling greater currents induction wattmeters are used in conjunction with?

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Last answer: Types of radioactive waste: The waste produced in nuclear power plant is in the form of solid, liquid & gases, 1. Solid Waste Disposal:- Solid wastes removed from the reactor are very ... are measured. If it is safe then released to atmosphere at high level through large height chimney.

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asked Mar 21, 2018 by anonymous

In a single phase power factor meter the phase difference between the currents in the two pressure coils is?

Last answer: In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

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asked Mar 20, 2018 by anonymous

Interruption of large currents by relay requires?

Last answer: Interruption of large currents by relay requires arc suppressing blow out coils, wide separation of the opened contacts, high speed opening of contacts.

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asked Apr 29, 2018 by anonymous

Which of the following can reduce the Eddy current losses?

Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage D) None of these

Last answer: Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage D) None of these

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63 views 1 answer

asked Mar 25, 2018 by anonymous

A ferrite core has less eddy current loss than an iron core because?

Last answer: A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

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281 views 1 answer

asked Mar 15, 2018 by anonymous

What is the difference between eddy current and hysteresis loss?

Last answer: Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

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asked Aug 6, 2017 by anonymous

what is eddy current ?

Last answer: In magnetic circuits when we supply current to coil which wound on some core( of iron cast iron, ferrite ) material it produce magnetic field but there is small amount of flux which also ... heat and losses in magnetic circuits..for good working conditions we always try to minimize eddy current

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asked Mar 18, 2018 by anonymous

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

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asked Mar 10, 2018 by anonymous

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asked Apr 30, 2018 by anonymous

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : (A) 256 W (B) 320 W (C) 500 W (D) 625 W

Last answer: The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

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77 views 1 answer

asked Apr 26, 2018 by anonymous

Eddy current damping cannot be used for moving iron instrument because

Last answer: Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

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asked Mar 21, 2018 by anonymous

The disc of an instrument using eddy current damping should be of?

Last answer: The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

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asked Feb 16, 2018 by anonymous

Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Last answer: Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

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Hysteresis and eddy current loss are used in

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asked Jan 7 by anonymous

Two unpedauces given by Z1 = 10 + j5 and Z2 = 8 + j9 are joined in parallel and connected across a voltage of V = 200 + j0. Calculate the circuit current and branch currents. Draw the vector diagram.

Last answer: Solution: Given, Z1=10+j5, Z2=8+j9, V=200+j0

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Two line currents of an unbalanced 3 phase 3wires system are 100<90 amp and 100<-10 amp find the third line currents

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asked May 25, 2018 by anonymous

For heating a magnetic material using induction heating, the hysteresis and eddy current losses are

For heating a magnetic material using induction heating, the hysteresis and eddy current losses are respectively proportional to (a) f and f 2 (b) f 2 and f (c) f and f (d) none of the above

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asked Mar 21, 2018 by anonymous

In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be?

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asked 4 days ago by anonymous

Troposphere is the hottest part of the atmosphere because (1) it is closest to the Sun (2) there are charged particles in it (3) it is heated by the Earth’s surface (4) heat is generated in it

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asked Mar 20, 2018 by anonymous

In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?

Last answer: In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using carbon brushes of superior quality.

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asked Mar 8, 2020 by anonymous

Eddy current

Last answer: Eddy current

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asked Sep 2, 2018 by anonymous

Compare AC & DC track circuits on i) Length of circuit ii) Application iii) Effect of stray currents. iv) Maintenance

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asked May 25, 2018 by anonymous

In delta connected load, the zero sequence currents

In delta connected load, the zero sequence currents (a) are absent (b) circulate locally (c) flow through phase wires (d) flow through earth wires

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asked Apr 28, 2018 by anonymous

A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and

A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are (A) 140 W (B) 180 W (C) 240 W (D) 480 W

Last answer: A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are 240 W

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asked Apr 25, 2018 by anonymous

Eddy current losses in transformer cores can be reduced by the use of 1. Solid cores 2. Laminated cores ...

Eddy current losses in transformer cores can be reduced by the use of 1. Solid cores 2. Laminated cores 3. Ferrites Select the correct answer using the codes given below : (a) 2 and 3 only (b). 1 and 2 only (c) 1 and 3 only (d) 1, 2 and 3

Last answer: Eddy current losses in transformer cores can be reduced by the use of 1. Solid cores 2. Laminated cores 3. Ferrites Select the correct answer using the codes given below : (a) 2 and 3 only (b). 1 and 2 only (c) 1 and 3 only (d) 1, 2 and 3

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asked Apr 23, 2018 by anonymous

In moving iron instruments, eddy current damping cannot be used as

In moving iron instruments, eddy current damping cannot be used as (a) They have a strong operating magnetic, field (b) They are not normally used in vertical position (c) They need a large damping force, which can only be provided by air friction (d) The introduction of a permanent magnet required for eddy current damping would distort the existing weak operating magnetic field

Last answer: In moving iron instruments, eddy current damping cannot be used as The introduction of a permanent magnet required for eddy current damping would distort the existing weak operating magnetic field

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asked Apr 10, 2018 by anonymous

In applying superposition theorem, to determine branch currents and voltages

In applying superposition theorem, to determine branch currents and voltages (a) all current and voltage sources are shorted. (b) only current sources are open circuited. (c) only voltage sources are shorted. (d) voltage sources are shorted and current sources are open circuited.

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asked Apr 10, 2018 by anonymous

Which fault gives rise to symmetrical fault currents ?

Which fault gives rise to symmetrical fault currents ? (a) Single line to ground fault (b) Line to line fault (c) Double line to ground fault (d) Three phase fault

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asked May 13, 2018 by anonymous

______ signal is generated by combining RD and WR signals with IO/M.

______ signal is generated by combining RD and WR signals with IO/M. (a) Control (b) System (c) Register (d) Memory

Last answer: Control signal is generated by combining RD and WR signals with IO/M.

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How eddy currents are generated?

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