A ferro resonant transformer regulation is also known as?

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asked Mar 19, 2018 by anonymous

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The purpose of providing iron core in a step-up transformer is?

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asked Mar 19, 2018 by anonymous

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The magnetising current of a transformer is usually small because it has?

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Noise level test in a transformer is a?

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

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asked Mar 19, 2018 by anonymous

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

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asked Mar 19, 2018 by anonymous

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

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asked Mar 19, 2018 by anonymous

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

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The secondary of a current transformer is always short-circuited under operating conditions because it?

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asked Mar 19, 2018 by anonymous

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

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The hum in a transformer is mainly attributed to?

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asked Mar 19, 2018 by anonymous

The maximum load that a power transformer can carry is limited by its?

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asked Mar 19, 2018 by anonymous

The efficiency of a transformer, under heavy loads, is comparatively low because?

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asked Mar 19, 2018 by anonymous

An open-circuit test on a transformer is conducted primarily to measure?

Last answer: The open-circuit test in a transformer is used to measure

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asked Mar 19, 2018 by anonymous

A no-load test is performed on a transformer to determine?

Last answer: A no-load test is performed on a transformer to determine magnetizing current and loss.

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asked Mar 19, 2018 by anonymous

The voltage transformation ratio of a transformer is equal to the ratio of?

Last answer: The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

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asked Mar 19, 2018 by anonymous

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

Last answer: If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

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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 May 22, 2020 by anonymous

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

Last 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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asked Apr 28, 2020 by anonymous

Even at no-load, a transformer draws current from the mains. Why?

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asked Mar 19, 2018 by anonymous

No-load current in a transformer?

Last answer: No-load current in a transformer lags behind the voltage by about 75°.

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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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asked Mar 19, 2018 by anonymous

Primary winding of a transformer?

Last answer: Primary winding of a transformer could either be a low voltage or high voltage winding.

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asked Mar 19, 2018 by anonymous

Which winding in a transformer has more number of turns ?

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

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anonymous · Answer 1 · 2018-03-19T18:59:42+0000

A ferro resonant transformer regulation is also known as constant current transformer.

A ferro resonant transformer regulation is also known as?

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