If the supply frequency to the transformer is increased, the iron loss will?

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asked Mar 19, 2018 by anonymous

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asked Mar 19, 2018 by anonymous

In an actual transformer the iron loss remains practically constant from no load to full load because?

Last answer: In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

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Iron loss of a transformer can be measured by?

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At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total

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Last answer: At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W

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asked Mar 20, 2018 by anonymous

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then?

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asked Mar 19, 2018 by anonymous

When secondary of a current transformer is open-circuited its iron core will be?

Last answer: When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

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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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asked Mar 25, 2018 by anonymous

The effective resistance of an iron-cored choke working on ordinary supply frequency...

The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of?

Last answer: The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of iron loss in core.

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asked May 8, 2018 by anonymous

What will happen if the primary of a transformer is connected to D.C. supply?

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asked Mar 19, 2018 by anonymous

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

Last answer: 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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asked Apr 28, 2018 by anonymous

The time period of third harmonic of power supply frequency, in milliseconds, is

The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60

Last answer: The time period of third harmonic of power supply frequency, in milliseconds, is 6.66

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asked Jun 18, 2018 by anonymous

The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of

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asked May 8, 2018 by anonymous

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to

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asked Jun 18, 2018 by anonymous

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to

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asked May 8, 2018 by anonymous

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The

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asked Mar 14, 2018 by anonymous

Why does a transformer only work with an AC supply?

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If the load of the normally excited synchronous motor is increased the power factor will?

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asked Mar 20, 2018 by anonymous

The maximum constant load torque under which a synchronous motor will pull into synchronism...

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

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asked Mar 20, 2018 by anonymous

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

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asked Mar 19, 2018 by anonymous

The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?

Last answer: The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be 400 W.

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asked Mar 20, 2018 by anonymous

As the load is increased the speed of D.C. shunt motor will?

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asked Mar 19, 2018 by anonymous

The purpose of providing an iron core in a transformer is to?

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The increased load during summer months is due to?

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asked Mar 20, 2018 by anonymous

If a D.C. series motor is operated on A.C. supply, it will?

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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.

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asked Mar 19, 2018 by anonymous

If a transformer is switched on to a voltage more than the rated voltage?

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asked May 8, 2018 by anonymous

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

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asked Apr 29, 2018 by anonymous

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

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asked Apr 29, 2018 by anonymous

The iron alloy, ALNICO is mainly used to make ________

The iron alloy, ALNICO is mainly used to make ________ A) Temporary magnets B) Permanent magnets C) Transmission lines D) None of these

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asked Mar 20, 2018 by anonymous

The steady state stability of the power system can be increased by?

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asked Apr 29, 2018 by anonymous

What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased?

What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known

Last answer: What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known

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asked Mar 21, 2018 by anonymous

If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is?

Last answer: If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.

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asked Mar 20, 2018 by anonymous

For high value of diversity factor, a power station of given installed capacity will be in a position to supply?

Last answer: For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

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asked Mar 25, 2018 by anonymous

In AC. circuits, laminated iron is invariably used in order to?

Last answer: In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.

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asked May 8, 2018 by anonymous

Stability of a transmission line can be increased by

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asked Mar 19, 2018 by anonymous

The core used in high frequency transformer is usually?

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asked Mar 19, 2018 by anonymous

When a given transformer is run at its rated voltage but reduced frequency, its?

Last answer: When a given transformer is run at its rated voltage but reduced frequency, its core flux density is increased.

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76 views 1 answer

asked Mar 19, 2018 by anonymous

A transformer cannot raise or lower the voltage of a D.C. supply because?

Last answer: A transformer cannot raise or lower the voltage of a D.C. supply because Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero.

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134 views 1 answer

asked Jun 17, 2018 by anonymous

If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged,

If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then: A) both hysteresis loss and eddy current loss in the core will increase B) hysteresis loss will increase but eddy current loss will decrease C) hysteresis loss will decrease but eddy current loss will increase D) hysteresis loss will decrease but eddy current loss will remain unchanged

Last answer: If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then: hysteresis loss will decrease but eddy current loss will remain unchanged

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asked Mar 19, 2018 by anonymous

The size of a transformer core will depend on?

Last answer: The size of a transformer core will depend on frequency and area of the core.

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asked Jul 1, 2019 by anonymous

Which is the best conductor: silver, carbon, or iron?

Last answer: Silver is the best conductor. Carbon is the semiconductor. Iron have less conductance as compared to silver.

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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 30, 2018 by anonymous

The inrush current of a transformer at no load is maximum if the supply voltage is switched on

The inrush current of a transformer at no load is maximum if the supply voltage is switched on (1) at peak voltage value (2) at zero voltage value (3) at half voltage value (4) at 0.866 time voltage value

Last answer: At 0.866 time voltage value

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asked Mar 19, 2018 by anonymous

An ideal transformer will have maximum efficiency at a load such that?

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

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96 views 1 answer

asked Mar 19, 2018 by anonymous

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

Last answer: For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

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89 views 1 answer

asked Mar 19, 2018 by anonymous

For given applied voltage, with the increase in frequency of the applied voltage?

Last answer: For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

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167 views 1 answer

asked Mar 25, 2018 by anonymous

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

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

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167 views 1 answer

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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531 views 1 answer

anonymous · Answer 1 · 2018-03-19T20:47:59+0000

If the supply frequency to the transformer is increased, the iron loss will increase.

If the supply frequency to the transformer is increased, the iron loss will?

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