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

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asked Jun 4, 2018 by anonymous

Full load copper loss in a transformer is 1600 watts. At half load the copper loss will be:

Full load copper loss in a transformer is 1600 watts. At half load the copper loss will be: A) 6400 watt B) 1600 watt C) 800 watt D) 400 watt

Last answer: Full load cupper loss in a transformer is 1600 watts. At half load the cupper loss will be: 400 watt

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178 views 1 answer

asked Apr 30, 2018 by anonymous

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

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 : (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

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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115 views 1 answer

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

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Last answer: A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

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406 views 1 answer

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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76 views 1 answer

asked May 17, 2018 by anonymous

A 500 kVA, 3-phase transformer has iron losses of 300 W and full load copper losses of 600 W. The percentage

A 500 kVA, 3-phase transformer has iron losses of 300 W and full load copper losses of 600 W. The percentage load at which the transformer is expected to have maximum efficiency is (A) 50.0% (B) 70.7% (C) 141.4% (D) 200.0%

Last answer: A 500 kVA, 3-phase transformer has iron losses of 300 W and full load copper losses of 600 W. The percentage load at which the transformer is expected to have maximum efficiency is 70.7%

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667 views 1 answer

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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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 Apr 11, 2018 by anonymous

A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : -

A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : - a) 16/9 b) 4 / 3 c) 3/4 d) 9 /16

Last answer: A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : - 9 /16

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116 views 1 answer

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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69 views 1 answer

asked Mar 19, 2018 by anonymous

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

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

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102 views 1 answer

asked Mar 19, 2018 by anonymous

Iron loss of a transformer can be measured by?

Last answer: Iron loss of a transformer can be measured by low power factor wattmeter.

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62 views 1 answer

asked Apr 30, 2018 by anonymous

A transformer operates 24 hours day at full -load. It's full -load efficiency is :

A transformer operates 24 hours day at full -load. It's full -load efficiency is : (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency

Last answer: A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency

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160 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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99 views 1 answer

asked Apr 28, 2020 by anonymous

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

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72 views 0 answers

asked May 17, 2018 by anonymous

A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit

A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at (A) 50.0% of the rated current (B) 64.0% of the rated current (C) 80.0% of the rated current (D) 88.8% of the rated current

Last answer: A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both ... measured loss is 81 W. The transformer has maximum efficiency when operated at 80.0% of the rated current

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201 views 1 answer

asked Apr 16, 2020 by bos

What is the efficiency of this transformer on full and half load.

1.) A 500kVA transformer has a primary winding resistance of 0.85Ω and a secondary winding resistance of 0.0025Ω. The primary and secondary voltages are 4.5kV and 600V, respectively. The iron loss is 6kW. If the power factor of the load is 0.75, determine the efficiency of the transformer on full load, and on half load.

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53 views 0 answers

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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90 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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103 views 1 answer

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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77 views 1 answer

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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84 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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56 views 1 answer

asked Mar 19, 2018 by anonymous

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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45 views 1 answer

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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102 views 1 answer

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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64 views 1 answer

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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60 views 1 answer

asked Sep 1, 2018 by anonymous

What will be the efficiency when the transformer operates at unity power factor and 60% of full load

Last answer: What will be the efficiency when the transformer operates at unity power factor and 60% of full load 96.5%

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139 views 1 answer

asked Jan 10 by anonymous

Harshith is a successful milk vector in salem. He sold half of the milk at 40% profit, half of the remaining milk at 40% loss and he rest was sold at his cost price. In the total transaction, his gain or loss will be

Last answer: total CP= Rs 100 total SP=[ 140/2+ 60/4+100/4] = 280+60+100/4 =440/4 =110 Gain=sp-cp=110-100=10 Gain% = 10/100*100=10%

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5 views 1 answer

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

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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69 views 1 answer

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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80 views 2 answers

asked Jan 8 by anonymous

A 50 KVA transformer has iron loss 2 kW on full load. Calculate its iron loss at 75% of full load.

Last answer: Iron loss is dependent on voltage and independent of load. Hence iron loss at 75% of Load = Iron loss at full load = 2 kW

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3 views 1 answer

asked Mar 19, 2018 by anonymous

The dielectric strength of transformer oil is expected to be?

Last answer: The dielectric strength of transformer oil is expected to be 33 kV.

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117 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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97 views 1 answer

asked May 13, 2018 by anonymous

In a transformer, zero voltage regulation at full load is

In a transformer, zero voltage regulation at full load is (a)Not possible (b) Possible at unity power factor load (c) Possible at leading power factor load (d) Possible at lagging power factor load

Last answer: In a transformer, zero voltage regulation at full load is Possible at leading power factor load

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199 views 1 answer

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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43 views 1 answer

asked May 17, 2018 by anonymous

A simple phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at

A simple phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is (A) 86.7% (B) 88.26% (C) 88.9% (D) 87.8%

Last answer: A simple phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is 87.8%

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323 views 1 answer

asked May 17, 2018 by anonymous

A single-phase, 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity

A single-phase, 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity power factor. If it is re-configured as a 500 V/750 V auto-transformer, its efficiency at its new rated load at unity power factor will be (A) 95.752% (B) 97.851% (C) 98.276% (D) 99.241%

Last answer: A single-phase, 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity power factor. If it is re-configured as a 500 V/750 V auto-transformer, its efficiency at its new rated load at unity power factor will be 98.276%

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214 views 1 answer

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

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V

Last answer: An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V

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120 views 1 answer

asked May 8, 2018 by anonymous

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be :

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above

Last answer: The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA

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130 views 1 answer

asked Sep 30, 2017 by anonymous

when will be the maximum efficiency of transformer?

Last answer: Transformer efficiency is maximum when copper losses are equal to iron losses.

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69 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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101 views 1 answer

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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83 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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57 views 1 answer

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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279 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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65 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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104 views 3 answers

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

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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124 views 1 answer

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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106 views 1 answer

anonymous · Answer 1 · 2018-03-19T21:08:48+0000

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

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

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