# No eddy current and hysteresis losses occur in

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No eddy current and hysteresis losses occur in Electrostatic instruments.

## Related questions

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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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The hysteresis and eddy current losses of a single phase transformer working on 200 V, 50 Hz supply are Ph and Pe respectively. The percentage decrease in these when operated on a 160 V, 40 Hz supply are   (a) 32, 36 (b) 20, 36 (c) 25, 50 (d) 40, 80

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Hysteresis and eddy current loss are used in (1) Induction heating of steel (2) Dielectric heating (3) Induction heating of brass (4) Resistance heating

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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

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What is the difference between eddy current and hysteresis loss?

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

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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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The eddy current loss in an AC motor is 100 watts at 50 Hz. Its losses at 100 Hz will be: (A) 25 watts (B) 59 watts (C) 100 watts (D) 400 watts

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Losses which occur in rotating electric machines and do not occur in transformers are?

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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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Eddy current damping is normally used in the instruments of (a) Induction type (b) Moving iron type (c) Permanent magnet moving coil type (d) Nothing can be said

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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

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Hysteresis losses in electrical machines is equal to a. B1.2max f b. B1.6max f c. B1.2min f d. B1.2max fmin

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Eddy current damping cannot be used for moving iron instrument because

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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

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How eddy current is produced in a transformer?

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The colour bands on a carbon composition resistor occur in the sequence: yellow, violet, yellow and silver. Its resistance is  (a) 470 KΩ ± 47 KΩ (b) 470 KΩ ± 23.5 % (c) 47 KΩ ± 10 % (d) 47 KΩ ± 5 %

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When running under no-load condition and with over excitation, armature current Ia drawn by a synchronous motor

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An ammeter has a current change of 0—5A and its internal resistance is 0.2 ohm. In order to Change the range to 0-25 A, wear need to add a resistance of  A) 0.8 ohm in series with the meter B) 1.0 ohm in series with the meter C) 0.04 ohm in parallel with the meter D) 0.05 ohm in parallel with the meter

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No load current in a transformer: (A) lags the applied voltage by 90° (B) lags the applied voltage by somewhat less than 90° (C) leads the applied voltage by 90° (D) leads the applied voltage by somewhat less than 90°

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In case of a power transformer, the no load current in terms of rated current is (1) 10-20% (2) 15-30% (3) 2-6% (4) 30-50%

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For a transformer, operating at constant load current, maximum efficiency will occur at?

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Advantages eddy current heating

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

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How eddy current can be minimized?

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what is eddy current ?

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The term hysteresis is associated with (A) On-Off control (B) P-I control (C) Feed forward control (D) Ratio control

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Explain how technical losses can be reduced by use of energy efficient transformer in Transmission and Distribution system.

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List out the different technical losses that takes place in Transmission and Distribution system.

2 answers 19 views

State commercial losses in transmission and distribution systems. Also state the remedies for the same.

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With neat diagram explain use of “reactive power controller” to reduce technical losses in transmission and distribution system.

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Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

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State and explain any four commercial losses in transmission and distribution system.

1 answer 14 views
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Reduction in core losses and increase in permeability are obtained with transformer employing?

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In a battery, the difference between the no-load voltage and the measured voltage output is called ________ A) Internal voltage B) Internal resistance C) External resistance D) All the above

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The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100Ohm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?

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The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100Ohm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?

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Once SCR starts conducting a forward current, its gate losses control over (A) Anode circuit voltage only (B) Anode circuit current only (C) Anode circuit voltage and current (D) None of the above

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State any four errors that occur in dynamometer type wattmeter

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When does the Body bias effect occur in an n-channel MOSFET?  A) When the Source voltage is less the Bulk voltage B) When the Source voltage is equal to or greater the Bulk voltage C) When the Drain voltage is equal to the Bulk voltage D) When the Gate voltage is equal to the Bulk Voltage

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Gross errors occur in measurements because of (A) disturbances about which we are unaware. (B) human mistakes. (C) inherent shortcomings in the instrument. (D) loading effects on the meters.

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When a ferromagnetic substance is magnetized, small changes in dimensions occur. Such a phenomenon is known as

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The double energy transient occur in the?

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