Recent questions tagged transformer

asked May 22, 2020 by anonymous

Explain the effect of Harmonics on the Transformer.

Last answer: Effect of Harmonics on the Transformer: 1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on ... small core vibrations. 5. Saturation problem: Sometimes additional harmonic voltage causes core saturation.

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31 views 1 answer

asked May 22, 2020 by anonymous

List two special feature of welding transformer.

Last answer: Special features of welding transformer: i) It is a step down transformer that reduces the source voltage to a voltage desired according to the demands of the welding process. ii) Having large primary turns and less ... V ii) Secondary voltage - 40 to 60 V iii) Secondary current - 200 to 600 A

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35 views 1 answer

asked May 22, 2020 by anonymous

State two applications of isolation transformer

Last answer: Applications of isolation transformer: i) Isolates the load equipment from supply ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device. iv) Protects loads from harmonic distortion.

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25 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 May 17, 2020 by anonymous

Equivalent circuit of transformer

Last answer: Equivalent Circuit Diagram of Transformer Referred to Primary: V1 -Primary Input voltage I1 - Input Current I0- Exciting current/ No load current Im- Magnetizing component ... equivalent of secondary terminal voltage ZL- Load impedance ZL ′- Primary equivalent of load impedance

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224 views 2 answers

asked May 16, 2020 by anonymous

Single phase transformer

Last answer: Single phase Transformer Transformer

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234 views 1 answer

asked May 15, 2020 by anonymous

What is the use of transformer?

Last answer: The use of transformer is to do lower or raise the voltage or currents in an electrical circuit. That's quite so simple.

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138 views 1 answer

asked May 10, 2020 by anonymous

Transformer on DC

Write about transformer on DC.

Last answer: Transformer on DC : Transformer cannot work on DC. Transformer works on electromagnetic induction principle. Electromagnetic induction principle means when flux linking with coil changes and EMF induced in it ... winding insulation will burn. https://youtu.be/TVp_0fIfxqY

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232 views 1 answer

asked Apr 30, 2020 by anonymous

Polarity Test of Transformer

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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278 views 2 answers

asked Apr 28, 2020 by anonymous

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

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71 views 0 answers

asked Apr 27, 2020 by anonymous

Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.

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68 views 0 answers

asked Apr 27, 2020 by anonymous

Explain the open delta (delta-delta) test on transformer.

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55 views 0 answers

asked Apr 16, 2020 by anonymous

Define Dielectric Strength for transformer oil. State its value for new transformer oil.

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53 views 0 answers

asked Aug 27, 2019 by anonymous

What is the back E.M.F in Transformer ?

Last answer: Back emf in transformer is when apply voltage in primary side of transformer. This voltage produce flux according to Faraday law electro magnetic induction. This flux called mutual flux and this ... secondary flux oppos the applied voltage according to lenz law. its called back emf of transformer

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118 views 1 answer

asked Aug 22, 2019 by Iqrima

Transformer is 180 degree phase shifting device.pls explain

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101 views 0 answers

asked Aug 19, 2019 by anonymous

transformer coupled amplifier

Last answer: transformer coupled amplifier

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51 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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100 views 1 answer

asked Jul 27, 2019 by anonymous

State any four characteristics of core type transformer.

Last answer: Characteristics of core type transformer: i) It has one window. ii) It has one magnetic circuit. iii) Core surrounds the winding. iv) Average length of core is more. v) Area of cross ... Better cooling for winding. vii) Mechnical strength is comparatively less. viii) Repair and maintenance is easy.

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70 views 1 answer

asked Jul 26, 2019 by anonymous

Explain construction and working of single phase Auto transformer.

Last answer: Construction of single phase auto transformer: (i) It has only one winding wound on a laminated circular magnetic core. (ii) The core is made of silicon steel stampings. (iii) The two terminals of the ... help of handle. 5) The same transformer can be used as step-up or step down auto-transformer

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107 views 1 answer

asked Jul 26, 2019 by anonymous

Explain construction and working principle of single phase transformer.

Last answer: A single phase transformers is an electrical device that accepts single-phase AC power and outputs single-phase AC. PRINCIPLE... The single-phase transformer works on the principle of ... and secondary windings. Thin steel laminations shall be employed to prevent power losses from the core.

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309 views 4 answers

asked Jul 6, 2019 by anonymous

Austin transformer

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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45 views 1 answer

asked Jun 29, 2019 by anonymous

What is auto transformer

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59 views 0 answers

asked Jun 11, 2019 by anonymous

Transformer efficiency

Last answer: Transformer efficiency

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63 views 1 answer

asked Sep 22, 2018 by anonymous

Explain any four advantages of amorphous transformer.

Last answer: Advantages of amorphous core transformer: 1) Lowest hysteresis loss. 2) Low eddy current loss. 3) Low temperature rise. 4) Up to 75% energy saving using amorphous metal than conventional metal. 5 ... capacity. 9) High Reliability. 10) Excellent short circuit capacity. 11) Less maintenance cost.

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65 views 1 answer

asked Sep 22, 2018 by anonymous

State the need of energy conservation in transformer.

Last answer: Need of energy conservation in transformer: In electrical power system, transformers are used to change the voltage levels of different sections as per the need of economic and efficient operation of ... for some other good reason. Therefore, there is need of energy conservation in transformer.

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68 views 1 answer

asked Sep 22, 2018 by anonymous

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

Last answer: Energy conservation techniques by installation of separate transformer / servo stabilizer: The luminous efficiency of lamps depends upon the voltage applied across the terminals. It gives its best ... the voltage constant in that installation for giving best luminous efficiency of lamps.

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93 views 1 answer

asked Sep 14, 2018 by anonymous

Explain construction and working of isolation transformer.

Last answer: Isolation Transformer https://youtu.be/gq9kjLlhPN0

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619 views 3 answers

asked Sep 14, 2018 by anonymous

Write selection criteria of distribution transformer with any four points.

Last answer: Selection Criteria for Distribution Transformer: i) Ratings - The kVA ratings should comply with IS:2026 ( Part l )-1977*. The noload secondary voltage should be 433 volts for transformers to be ... is not necessary. vi) Cooling - The transformers covered in this group are generally ONAN, AN

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164 views 2 answers

asked Sep 6, 2018 by anonymous

Write any four advantages of instrument transformer.

Last answer: Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.

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62 views 1 answer

asked Sep 6, 2018 by anonymous

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

Last answer: Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.

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41 views 1 answer

asked Sep 5, 2018 by anonymous

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

Last answer: Parameter RC coupled Transformer coupled Direct coupled Coupling element Resistor and capacitor Transformer No element Impedance matching Poor Excellent good Frequency ... Low frequency amplifier,opamp Size and cost small Large and bulky least

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1.5k views 1 answer

asked Sep 1, 2018 by anonymous

Introduction to transformer

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed ... power start transformer, autotransformer, multiphase transformer, magnetic flux linkage transformer, resonant transformer etc.

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56 views 1 answer

asked Aug 12, 2018 by anonymous

Why Transformer rating is given in kVA?

Last answer: 1) The output of transformer is limited by heating due to the losses. Two types of losses in the transformer (i) Iron loss, (ii) Copper loss. 2) Iron loss depends on the transformer voltage (V). ... by load power factor. - Hence the transformer output is expressed in VA or kVA and not in kW.

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2.7k views 4 answers

asked Aug 12, 2018 by anonymous

Define kVA rating of transformer.

Last answer: kVA rating of transformer is defined as the product of voltage (V) and current (I) on primary side of transformer or secondary side of transformer divided by 1000. On both side the VA rating remains ... Mathematically kVA rating is given by, kVA rating of transformer = V1I1/1000 =V2I2/1000

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141 views 1 answer

asked Aug 12, 2018 by anonymous

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

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80 views 0 answers

asked Aug 12, 2018 by anonymous

State the working principle of transformer.

Last answer: Working principle of transformer : Transformer works on the principle of mutual electromagnetic induction. When AC voltage is applied to the primary winding it causes ac current to flow through primary ... the secondary winding. The current flows in the secondary circuit if load is connected.

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2.8k views 6 answers

asked Aug 12, 2018 by anonymous

State any four applications of transformer.

Last answer: The application of Transformer are 1. Transformer is used for stepping up voltage or stepping down voltage. 2. Transformer is used for isolating load from high voltage or high current. 3. Transformer is used as voltage regulator. 4. Transformer used for power transmission and distribution.

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96 views 1 answer

asked Aug 12, 2018 by anonymous

Define transformer.

Last answer: The transformer is a static device which transformed electrical power by stepping up AC voltage and stepping down AC current or by stepping down AC voltage and stepping up AC current and keeping frequency constant.

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99 views 1 answer

asked Jul 14, 2018 by Raldji

Deisign and simulation of 50 K.V.A Transformer 11/0.415kV using MATLAB or EM works

MATLAB design code and model description.

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63 views 0 answers

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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118 views 1 answer