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Sumpner's test is conducted on transformer to determine?

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

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

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

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

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

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A no-load test is performed on a transformer to determine?

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A no-load test is performed on a transformer to determine magnetizing current and loss.

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During open circuit test of a transformer?

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

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

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

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Polarity Test of Transformer

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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

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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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Primary is high voltage side and Secondary is low Voltage side.

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Primary side is low voltage side and secondary side is high voltage side.

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

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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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

Answer :

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

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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.

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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Noise level test in a transformer is a type test.

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Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.

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If a transformer is switched on to a voltage more than the rated voltage?

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If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

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Brake test on DC series motor

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The duration of sudden short-circuit test on a synchronous motor is usually about one second.

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Explain the effect of Harmonics on the Transformer.

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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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Write about transformer on DC.

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

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The size of a transformer core will depend on?

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The size of a transformer core will depend on frequency and area of the core.

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During short circuit test iron losses are negligible because?

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During short circuit test iron losses are negligible because the voltage applied on primary side is low.

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Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.

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Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.

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The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds 150°C.

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In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

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If the supply frequency to the transformer is increased, the iron loss will increase.

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A transformer can have regulation closer to zero on leading power factor.

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The hum in a transformer is mainly attributed to?

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The hum in a transformer is mainly attributed to magnetostriction.

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

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The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

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Part of the transformer which is most subject to damage from overheating is?

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Part of the transformer which is most subject to damage from overheating is winding insulation.

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The dielectric strength of transformer oil is expected to be?

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The dielectric strength of transformer oil is expected to be 33 kV.

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DC motor brake test numerical

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What is test bench? Write its applications

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Test Bench: A test bench is used to verify the functionality of the design. We need to stimulate our designs in order to test their functionality. Stimulus in a real system is from an ... the entity under test and to collect output responses. 6. To compare output responses with expected values.

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Murray loop test can be used for location of both the ground fault and the short-circuit fault.

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How do you test a capacitor with a multimeter?

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Why high voltage test is done?

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What is an insulation resistance test?

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What is a high voltage test?

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List two special feature of welding transformer.

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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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State two applications of isolation transformer

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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State why a transformer always have an efficiency of more than 90%.

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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