# Sumpner's test is conducted on transformer to determine?

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Sumpner's test is conducted on transformer to determine?

Sumpner's test is conducted on transformer to determine temprature.

## Related questions

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Description : An open-circuit test on a transformer is conducted primarily to measure?

Last Answer : The open-circuit test in a transformer is used to measure

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Last Answer : Short circuit test on transformers is conducted to determine copper losses.

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Last Answer : Hopkinson's test on D.C. machines is conducted at full-load.

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Description : 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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Description : During open circuit test of a transformer?

Last Answer : During open circuit test of a transformer primary is supplied rated voltage.

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Description : 1 Sumpner's test is conducted on transformers to find A. Temperature B. Stray losses C. All-day efficiency D. None of the above

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Description : Polarity Test of Transformer

Last Answer : Polarity Test of Transformer

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

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

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Description : If a 5-bus test system contains 6 transmission lines and one transformer, how many non-zero elements are there in the system Y-bus ? (A) 25 (B) 12 (C) 11 (D) 19

Last Answer : If a 5-bus test system contains 6 transmission lines and one transformer, 19 non-zero elements are there in the system Y-bus.

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Last Answer : Low voltage side is short circuited.

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Last Answer : Primary is high voltage side and Secondary is low Voltage side.

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Last Answer : High Voltage side is open circuited.

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Last Answer : Primary side is low voltage side and secondary side is high voltage side.

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Last Answer : In short circuit test of transformer the low voltage side is short circuited . On high voltage side the voltmeter is connected in parallel and ammeter in series and also a wattmeter is ... circuit test is done for determining impedance and losses. In this test iron losses is neglected.

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Description : Why phasing out and polarity test is carried out on three phase transformer?

Last Answer : The phasing out test is carried out to identify the windings (primary and secondary) of corresponding phase of the three phase transformer. The polarity test is carried out to identify the ... identical polarity of the primary and secondary windings of each phase of the three phase transformer.

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Description : Why Sumpner's test is carried out?

Last Answer : Loading a transformer is a very difficult thing to test. Say the transformer is rated at 300 MVA, now how to find a 300MVA load to test your transformer? Also the load will waste ... back to back means,primaries of two transformers connected in parallel and secondaries side connected in series.

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Description : What is determined from Sumpner's test?

Last Answer : Efficiency as well as temperature rise of winding.

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Last Answer : Noise level test in a transformer is a type test.

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Description : Why the open circuit test on a transformer is conducted at rated voltage?

Last Answer : A:The open circuit on a transformer is conducted at a rated voltage because core loss depends upon the voltage. This open circuit test gives only core loss or iron loss of the transformer.

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Description : With the help of neat diagram, describe the procedure to carry out phasing out test on a 3 phase transformer. Also state the purpose of conducting this test on 3 phase transformer.

Last Answer : i) This test is carried out on 3-ph transformer to identify primary & secondary winding belonging to the same phase. ii) As shown in fig above all primary & secondary phases ... of this test is to check the respective phases of primary & secondary windings in 3-ph transformer

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Description : Slip test is performed to determine :  (A) Slip in an induction motor  (B) Xd and Xq in a salient pole alternator  (C) Synchronous impedance in an alternator  (D) Positive and negative sequence impedances of an alternator

Last Answer : Slip test is performed to determine :  Xd and Xq in a salient pole alternator

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Description : 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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Description : 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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Description : 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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Description : 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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Description : 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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Description : Single phase transformer

Last Answer : Single phase Transformer Transformer

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

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Description : 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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Description : 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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Description : 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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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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Last Answer : In the transformer low voltage winding has got more cross-sectional area.

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Last Answer : A transformer cannot raise or lower the voltage of a D.C. supply because Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero.

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Last Answer : Primary winding of a transformer could either be a low voltage or high voltage winding.

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Last Answer : High voltage winding in a transformer has more number of turns.

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Last Answer : The efficiency of a power transformer is of the order of 98 percent.

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Last Answer : The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

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Last Answer : In a transformer, routine efficiency depends upon load current and power factor of load.

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Last Answer : The maximum efficiency of a distribution transformer is at 50% full load.

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Last Answer : No-load current of a transformer has small magnitude and low power factor.

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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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Last Answer : The power transformer is a constant main flux device.

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Last Answer : In a transformer, the tappings are generally provided on low voltage side.

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Last Answer : The use of higher flux density in the transformer design reduces weight per kVA.