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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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1 answer 21 views

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

asked Jun 4, 2018 in Transformer by Shimroz123
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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 loss at maximum efficiency is :  (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
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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%

asked May 17, 2018 in Transformer by Shimroz123
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 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

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

asked Mar 19, 2018 in Transformer by Shimroz123
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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

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
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When secondary of a current transformer is open-circuited its iron core will be?

asked Mar 19, 2018 in Transformer by Shimroz123
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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

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
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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

asked May 17, 2018 in Transformer by Shimroz123
1 answer 25 views

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

asked Mar 19, 2018 in Transformer by Shimroz123
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What will be the efficiency when the transformer operates at unity power factor and 60% of full load 

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The size of a transformer core will depend on?

asked Mar 19, 2018 in Transformer by Shimroz123
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If a transformer is continuously operated the maximum temperature rise will occur in?

asked Mar 19, 2018 in Transformer by Shimroz123
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The maximum load that a power transformer can carry is limited by its?

asked Mar 19, 2018 in Transformer by Shimroz123
2 answers 38 views

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

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
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The dielectric strength of transformer oil is expected to be?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 10 views
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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

asked Mar 19, 2018 in Transformer by Shimroz123
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A no-load test is performed on a transformer to determine?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 17 views

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%

asked May 17, 2018 in Transformer by Shimroz123
1 answer 17 views

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%

asked May 17, 2018 in Transformer by Shimroz123
1 answer 16 views

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

asked May 13, 2018 in Transformer by Shimroz123
1 answer 20 views

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

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 31 views

The r.m.s. value of a half-wave rectified alternating current is 10 A. Its value for full-wave rectification will be  

asked May 25, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views
1 answer 37 views

 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 

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
1 answer 9 views
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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

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

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

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 14 views

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

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 20 views

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

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 20 views

In a transformer the voltage regulation will be zero when it operates at (A) unity p.f. (B) leading p.f. (C) lagging p.f. D) zero p.f. leading.

asked May 22, 2018 in Transformer by Shimroz123

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