No-load current in a transformer?

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asked Mar 19, 2018 by anonymous

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asked Mar 19, 2018 by anonymous

The no load current in a transformer lags behind the applied voltage by an angle of about?

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 Apr 28, 2020 by anonymous

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

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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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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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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

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 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

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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asked Mar 19, 2018 by anonymous

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

Last answer: In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

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asked Sep 27, 2017 by anonymous

in open circuit or no load test of transformer which side is open circuited?

Last answer: High Voltage side is open circuited.

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91 views 1 answer

asked Sep 27, 2017 by anonymous

in open circuit or no load test of transformer which side is low voltage side and which side is high voltage side?

Last answer: Primary side is low voltage side and secondary side is high voltage side.

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94 views 1 answer

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 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

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

Last answer: The maximum load that a power transformer can carry is limited by its voltage ratio.

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104 views 1 answer

asked Mar 19, 2018 by anonymous

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

Last answer: The magnetising current of a transformer is usually small because it has small air gap.

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60 views 1 answer

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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101 views 1 answer

asked Mar 19, 2018 by anonymous

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

Last answer: The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.

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asked Mar 27, 2018 by anonymous

The no-load current drawn by transformer is usually what per cent of the full-load current ?

Last answer: 5 to 8 percentage of full load current

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asked Mar 19, 2018 by anonymous

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

Last answer: The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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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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asked Mar 19, 2018 by anonymous

In a transformer routine efficiency depends upon?

Last answer: In a transformer, routine efficiency depends upon load current and power factor of load.

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asked Mar 19, 2018 by anonymous

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

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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53 views 1 answer

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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67 views 1 answer

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

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

The leakage flux in a transformer depends upon?

Last answer: The leakage flux in a transformer depends upon load current.

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asked Mar 19, 2018 by anonymous

Noise level test in a transformer is a?

Last answer: Noise level test in a transformer is a type test.

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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 ?

Last answer: The value of flux involved in the e.m.f. equation of a transformer is maximum value.

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asked Mar 19, 2018 by anonymous

The function of breather in a transformer is?

Last answer: The function of breather in a transformer is to arrest flow of moisture when outside air enters the transformer.

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asked Mar 19, 2018 by anonymous

In a power or distribution transformer about 10 percent end turns are heavily insulated?

Last answer: In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.

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70 views 1 answer

asked Mar 19, 2018 by anonymous

In a transformer the resistance between its primary and secondary should be?

Last answer: In a transformer the resistance between its primary and secondary should be infinity.

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101 views 1 answer

asked Mar 19, 2018 by anonymous

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

Last answer: If a transformer is continuously operated the maximum temperature rise will occur in windings.

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asked Mar 19, 2018 by anonymous

The hum in a transformer is mainly attributed to?

Last answer: The hum in a transformer is mainly attributed to magnetostriction.

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asked Mar 19, 2018 by anonymous

The path of magnetic flux in a transformer should have?

Last answer: The path of magnetic flux in a transformer should have low reluctance.

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asked Mar 19, 2018 by anonymous

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

Last answer: In the transformer low voltage winding has got more cross-sectional area.

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133 views 1 answer

asked Mar 19, 2018 by anonymous

Transformer breaths in when?

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

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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

The transformer ratings are usually expressed in terms of?

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

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asked Mar 19, 2018 by anonymous

The core used in high frequency transformer is usually?

Last answer: The core used in high frequency transformer is usually air core .

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asked Mar 19, 2018 by anonymous

Which type of winding is used in 3 phase shell-type transformer ?

Last answer: Sandwich type winding is used in 3 phase shell-type transformer.

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108 views 1 answer

asked Mar 19, 2018 by anonymous

Reduction in core losses and increase in permeability are obtained with transformer employing?

Last answer: Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

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asked Mar 19, 2018 by anonymous

what do not change in transformer?

Last answer: Frequency and power are constant in transformers. Suppose we apply 50 Hz input frequency then the output frequency will also be 50 Hz whether the transformer is step up or step down. Similar ... is decreased on secondary side and hence power on primary side and secondary side remains constant.

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77 views 1 answer

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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31 views 1 answer

asked Jul 27, 2019 by anonymous

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

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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102 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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137 views 1 answer

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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62 views 1 answer

asked Mar 19, 2018 by anonymous

Efficiency of a power transformer is of the order of?

Last answer: The efficiency of a power transformer is of the order of 98 percent.

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60 views 1 answer

asked Mar 19, 2018 by anonymous

The maximum efficiency of a distribution transformer is?

Last answer: The maximum efficiency of a distribution transformer is at 50% full load.

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58 views 1 answer

anonymous · Answer 1 · 2018-03-19T21:59:11+0000

answered Mar 19, 2018 by anonymous

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

No-load current in a transformer?

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