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No eddy current and hysteresis losses occur in Electrostatic instruments.

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0 answers 14 views

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 

asked May 25, 2018 in Utilization of electrical energy by Shimroz123
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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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asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

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

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
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What is the difference between eddy current and hysteresis loss?

asked Mar 15, 2018 in Electrical Engineering by Quiz
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Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

asked Feb 16, 2018 in Unit 3 by Quiz
1 answer 10 views

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

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 32 views

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

asked Apr 11, 2018 in Computer Engineering by Shimroz123
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Losses which occur in rotating electric machines and do not occur in transformers are?

asked Mar 19, 2018 in Transformer by Shimroz123
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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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

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 

asked May 25, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 32 views

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

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 5 views

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

asked Sep 1, 2018 by Shimroz123
1 answer 195 views
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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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0 answers 62 views

How eddy current is produced in a transformer?

asked Mar 15, 2018 in Electrical Engineering by Quiz
1 answer 10 views

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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1 answer 9 views

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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1 answer 11 views

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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0 answers 13 views

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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1 answer 19 views
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For a transformer, operating at constant load current, maximum efficiency will occur at?

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1 answer 21 views

Advantages eddy current heating

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1 answer 37 views

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

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
0 answers 8 views

How eddy current can be minimized?

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1 answer 49 views

what is eddy current ?

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1 answer 10 views

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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2 answers 68 views

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

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

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1 answer 190 views

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

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

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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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

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?

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 21 views

 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?

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 14 views

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

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 6 views

State any four errors that occur in dynamometer type wattmeter

asked Sep 6, 2018 by Shimroz123
1 answer 20 views

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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1 answer 18 views

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?

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