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A dc series motor when connected across an AC supply will

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Harmonics in transformer result in increased core losses, increased I2R losses, and magnetic interference with communication circuits.

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1 answer 13 views

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in?

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Slot harmonics are reduced in induction motors by using (A) fractional-pitch windings (B) fractional-slot windings (C) integral-slot windings (D) distributed windings

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State the need for reduction of harmonics in inverters. Enlist the various methods for reduction of harmonics in inverter output.

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Why harmonics are generated in electrical system?

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What is mitigation of harmonics?

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What is current harmonics?

asked Mar 10, 2018 in Power quality by Quiz
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What are even and odd harmonics?

asked Mar 10, 2018 in Power quality by Quiz
1 answer 63 views

What are the main causes of harmonics?

asked Mar 10, 2018 in Power quality by Quiz
0 answers 22 views

Why do non linear loads cause harmonics?

asked Mar 10, 2018 in Power quality by Quiz
2 answers 23 views

Losses which occur in rotating electric machines and do not occur in transformers are?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 18 views

The efficiency of two identical transformers under load conditions can be determined by?

asked Mar 19, 2018 in Transformer by Shimroz123
2 answers 27 views

The efficiencies of transformers compared with that of electric motors of the same power are?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 40 views

Why circuit breaker connect b)w two transformer  (same rating

asked Apr 28 by Umar Yousaf
1 answer 115 views

In a transmission line if booster transformers are to be used, preferred location will be  (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line 

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 78 views

The friction losses in Real Transformers are :  (A) 0% (B) 5% (C) 25% (D) 50%

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

Two 3-phase transformers cannot be operated in parallel, if their :  (A) kVAs are different (B) phase sequences are different (C) % impedances are different (D) voltage ratios are different

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

Which of the following is the advantage of using CRGO steel in transformers? A) High magnetic flux density B) Low permeability C) Both A and B D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

What is the back EMF in Transformers?

asked Mar 15, 2018 in Electrical Engineering by Quiz
1 answer 64 views
1 answer 23 views

Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

Core type transformers are popular in___________.  (A) High voltage applications (B) Low voltage applications (C) All of the above (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 33 views

Why do transformers make noise?

asked Dec 17, 2017 in Switchgear And Protection by Quiz
0 answers 98 views

In star-star connection of 3-phase transformer, the triplen harmonics are suppressed by using (A) star connected tertiary windings (B) delta connected tertiary windings (C) neutral conductor (D) additional insulation for the phases 

asked Jun 4, 2018 in Electrical Machine by Shimroz123
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
0 answers 26 views

The maximum flux in a transformer is φm when primary voltage is V and the frequency is f. If the primary voltage is 2 V and frequency is f/2, the flux will be (a) 4 φm (b) 0.25 φm (c) φm (d) 0.5 φm

asked May 25, 2018 in Transformer by Shimroz123
1 answer 16 views

When two transformer of different kVA rating are connected in parallel they share the load in proportion to their respective kVA rating only when their:

asked May 22, 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
1 answer 23 views

The function of oil in a transformer is to provide  A) Insulation and cooling B) Protection against Lightning C) Protection against short circuit D) Lubrication

asked May 20, 2018 in Transformer by Shimroz123
1 answer 24 views

A single-phase transformer has a turns ratio of 1 :2 and is connected to a purely resistive load as shown in the figure. The magnetizing current drawn is 1A, and the secondary current is 1A. Ifcore losses and leakage reactances are neglected, the primary current is  A)1.41A B)2A C) 2.24A D)3A

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

Which three-phase connection can be used in a transformer to introduce a phase difference of 30o between its output and corresponding input line voltages  (A) Star-Star (B) Star-Delta (C) Delta-Delta (D) Delta-Zigzag

asked May 17, 2018 in Transformer by Shimroz123
1 answer 4 views

Which losses in a transformer varies significantly with load  a. Hysteresis losses b. Eddy current losses c. Copper losses d. Core losses 

asked May 17, 2018 in Transformer by Shimroz123
1 answer 11 views

In a power transformer, the fundamental frequency of the hum arising due to magnetostriction is  (a) equal to the line frequency (b) double the line frequency (c) 4 times the line frequency (d) not related to the line frequency

asked May 15, 2018 in Transformer by Shimroz123
1 answer 593 views

In a step-up or step-down transformer, electrical power is transferred from one circuit to another without change in

asked May 14, 2018 in Transformer by Shimroz123
1 answer 13 views

In a transformer, low voltage winding is placed near the core in case of concentric windings so as to  1. Reduce the leakage flux 2. Reduce the insulation requirement 3. Reduce the risk of voltage shock in case of insulation breakdown 4. Reduce the core loss   From these, the correct answer is (a) 1, 2, 3 (b) 2, 3, 4 (c) 1, 2, 3, 4 (d) 2, 3

asked May 13, 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

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