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

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

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asked Mar 19, 2018 by anonymous

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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

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asked Mar 19, 2018 by anonymous

54] In operating a 400hz transformer at 50Hz A. Only voltage is reduced in the same proportion as the frequency B. Only KVA rating is reduced in the same proportion as the frequency C. Both voltage and KVA rating are reduced in the same proportion as frequency d. None of the above

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

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State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation

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Last Answer : Transformer A with 4% voltage regulation is better. Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

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Last Answer : The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

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asked Dec 27, 2021 by itszee

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asked Jul 21, 2021 by jyoti kurekar

7 The main advantage of auto transformer over a two winding transformer is A. Hysteresis losses are reduced B. Saving in winding material C. Copper losses are negligible D. Eddy losses are totally eliminated 8 During short circuit test iron losses are negligible because A. The current on secondary side is negligible B. The voltage on secondary side does not vary C. The voltage applied on primary side is low D. Full-load current is not supplied to the transformer

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

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

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Explain construction and working of single phase Auto transformer.

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

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In the transformer which winding has got more cross-sectional area?

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Primary winding of a transformer?

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Which winding in a transformer has more number of turns ?

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Efficiency of a power transformer is of the order of?

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asked Mar 19, 2018 by anonymous

In a transformer routine efficiency depends upon?

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The maximum efficiency of a distribution transformer is?

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Transformer breaths in when?

Last Answer : Transformer breaths in when load on it decreases.

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No-load current of a transformer has?

Last Answer : No-load current of a transformer has small magnitude and low power factor.

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

Last Answer : The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.

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asked Mar 19, 2018 by anonymous

The power transformer is a constant?

Last Answer : The power transformer is a constant main flux device.

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asked Mar 19, 2018 by anonymous

In a transformer the tappings are generally provided on?

Last Answer : In a transformer, the tappings are generally provided on low voltage side.

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asked Mar 19, 2018 by anonymous

The use of higher flux density in the transformer design?

Last Answer : The use of higher flux density in the transformer design reduces weight per kVA.

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asked Mar 19, 2018 by anonymous

The chemical used in breather for transformer should have the quality of?

Last Answer : The chemical used in breather for transformer should have the quality of cleansing the transformer oil.

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asked Mar 19, 2018 by anonymous

An ideal transformer has infinite values of primary and secondary inductances. The statement is?

Last Answer : An ideal transformer has infinite values of primary and secondary inductances. The statement is false.

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asked Mar 19, 2018 by anonymous

The transformer ratings are usually expressed in terms of?

Last Answer : The transformer ratings are usually expressed in terms of kVA.

318 views 1 answer

asked Mar 19, 2018 by anonymous

Material used for construction of transformer core is usually?

Last Answer : Material used for construction of transformer core is usually silicon steel.

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asked Mar 19, 2018 by anonymous

The thickness of laminations used in a transformer is usually?

Last Answer : The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.

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asked Mar 19, 2018 by anonymous

The function of conservator in a transformer is?

Last Answer : conservator or a reservoir tank for insulating oil in transformer which used for balanced the onload oil level with help of oil level indicator which mount on middle part of reservoir tank.

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asked Mar 19, 2018 by anonymous

A transformer oil must be free from?

Last Answer : A transformer oil must be free from moisture.

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asked Mar 19, 2018 by anonymous

Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?

Last Answer : Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds 150°C.

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asked Mar 19, 2018 by anonymous

The main reason for generation of harmonics in a transformer could be?

Last Answer : The main reason for generation of harmonics in a transformer could be saturation of core.

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asked Mar 19, 2018 by anonymous

anonymous · Answer 1 · 2018-03-19T20:51:11+0000

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

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

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