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Which of the following is not a sequential storage device?

Recent questions tagged transformer

1 answer 10 views

Austin transformer

asked Jul 6 in Wikipedia by Shimroz123
0 answers 21 views
asked Jun 29 by anonymous
1 answer 35 views

Transformer efficiency

asked Jun 11 by Shimroz123
1 answer 24 views

Explain any four advantages of amorphous transformer.

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 15 views

State the need of energy conservation in transformer. 

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 31 views

Explain energy conservation method in lighting system by using installation of separate transformer / servo stabilizer.

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 6 views

Write any four advantages of instrument transformer.

asked Sep 6, 2018 by Shimroz123
1 answer 6 views

State the advantages of instrument transformer in using for extension of range of meters. 

asked Sep 6, 2018 by Shimroz123
1 answer 9 views

Compare RC coupled, transformer coupled and direct coupled amplifier based on four points.

asked Sep 5, 2018 by Shimroz123
1 answer 28 views

Introduction to transformer

asked Sep 1, 2018 by Zeeshan
3 answers 147 views

Why Transformer rating is given in kVA?

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 73 views
0 answers 32 views

State the four major parts of Transformer and material used for their construction.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
2 answers 86 views
1 answer 46 views
1 answer 39 views
0 answers 28 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 53 views

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

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 21 views

The operating point of a protective current transformer is near the

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 13 views

Cylindrical type transformer has:  (A) Single magnetic circuit (B) Double magnetic circuit (C) All of the above (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

The transformer works on the principle of: (A) Mutual induction (B) Mutual capacitance (C) All of the above (D) None of the above

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

The rating of transformer may be expressed in ____________.  (A) kVAR (B) kW (C) kVA (D) Horse power

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

Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines:  (A) Delta-Star (B) Star-Delta (C) Delta-Delta (D) Star-Star

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

Which of the following does not change in a transformer?  (A) Current (B) Voltage (C) Frequency (D) All of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

Which of the following is not a part of transformer installation?  (A) Conservator (B) Breather (C) Buchholz Relay (D) Exciter

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 9 views

A Step Up transformer :  (A) Steps up the level of Voltage (B) Steps down the level of current (C) Step up the level of Frequency (D) (a) and (b) only

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

The core construction is like spokes of a wheel in following transformer:  (A) Berry Type Transformer (B) Core Type Transformer (C) Shell Type Transformer (D) None of the above

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 38 views

Increasing the number of turns of wire on the secondary of a transformer will  (A) Decrease the secondary current (B) Increase the primary current (C) Have no effect on the secondary current (D) Increase the secondary current

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 5 views

A Transformer______________.  (A) Changes DC to AC (B) Changes AC to DC (C) Steps up or down DC Voltages & Current (D) Steps up or down AC Voltages & Current

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 36 views

Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

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 9 views

Transformer has __________________ .  (A) Primary winding and secondary winding (B) Primary winding and Auxiliary winding (C) Auxiliary winding and secondary winding (D) None of the above

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

What will happen if the primary of a transformer is connected to D.C. supply?  (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn 

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 74 views

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be excessive  (B) Current will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary?  (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 45 views

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

asked May 3, 2018 in Power system by Shimroz123
1 answer 21 views

The desirable properties of transformer core material are  (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 27 views

A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

asked Apr 30, 2018 in Power system 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
1 answer 32 views

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
1 answer 23 views

IDMT relays are used to protect the transformer against :  (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 41 views

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
1 answer 29 views

If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then  (A) zero sequence currents are present on both sides of the transformer  (B) zero sequence currents are absent on both sides of the transformer  (C) zero sequence currents are present on the secondary side but not on the primary side  (D) zero sequence currents are present on the primary side but not on the secondary side

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 40 views

To prevent mal-operation of differentially connected relay while energizing a transformer, the relay restraining coil is based with  (1) second harmonic current  (2) third harmonic current  (3) fifth harmonic current  (4) seventh harmonic current

asked Apr 29, 2018 in Switchgear And Protection by Shimroz123
1 answer 31 views

What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems to step up high voltage signals and provide extra high voltage C) It is a transformer used in power systems to step down extra high voltage signals and provide low voltage D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

Which of the following is true with an auto transformer? A) It has only one winding  B) It has two separate windings namely primary winding and secondary winding C) It has two primary windings and one single secondary winding D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

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
1 answer 41 views

A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is (A) 216 V (B) 226 V (C) 234 V (D) 236 V

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

In a single-phase transformer, the magnetizing current is (A) in phase with the no-load current (B) in quadrature with the no-load current (C) the product of no-load current and power factor (D) in phase with the flux in the core

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123

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