# During open circuit test of a transformer?

During open circuit test of a transformer?

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

## Related questions

Answer : High Voltage side is open circuited.

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

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

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

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

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

Answer : Low voltage side is short circuited.

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

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.

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

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

Description : Sumpner's test is conducted on transformer to determine?

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

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

Description : Describe the difference between an open circuit and a short circuit.

Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Description : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W

Answer : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W

Answer : It is required to measure the true open circuit e.m.f. of a battery. The best device is D.C. potentiometer.

Description : Explain open emitter BJT drive circuit.

Answer : open emitter BJT drive circuit:

Description : Polarity Test of Transformer

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%; }

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

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.

Description : Equivalent circuit of transformer

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

Description : 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.

Description : During short circuit test iron losses are negligible because?

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

Description :  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

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

Answer : The short circuit in any winding of the transformer is the result of impulse voltage.

Description : When secondary of a current transformer is open-circuited its iron core will be?

Answer : When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

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

Description : The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by which part of the transformer?

Answer : The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by conservator.

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.

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

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

Description : A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, ... .0% of the rated current (C) 80.0% of the rated current (D) 88.8% of the rated current

Answer : A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both ... measured loss is 81 W. The transformer has maximum efficiency when operated at 80.0% of the rated current

Description : What are the disadvantages of Open loop control system?

Answer : Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.

Description : Why CT is never operated with an open secondary ?

Answer : CT secondary should never be kept open because it will cause saturation of the core to a high level and very high voltage will appear across the secondary which can breakdown the insulation. One terminal of PT secondary is always grounded to avoid capacitive induction and for human safety

Description : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth

Answer : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth

Description : If the gain of the open loop system is doubled, the gain margin  (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth

Answer : If the gain of the open loop system is doubled, the gain margin Becomes half

Description : An open resistor, when checked with an ohm-meter reads?

Answer : An open resistor, when checked with an ohm-meter reads infinite.

Answer : Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.

Answer : If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

Description : What is an example of an open loop system?

Answer : Open loop system. Ex. Electric heater, washing machine, fan, electric switch, etc

Description : What are the advantages of open loop control system?

Answer : Open loop control system are simple to design. Open loop control system are generally stable.

Description : what is open loop and close loop control system?

Answer : A) In open loop system the input is independent         of output but output is depends on input. A-1. no feedback path in open loop s/m    -2. less accuracy than close loop s/m. Ex. Washing ...    -3. high accuracy. Ex. Air conditioner ( AC ), rocket launcher, radar          system, etc

Description : Earth General Knowledge Test

Answer : Earth General Knowledge Test Its a common perception that the earth began billions of years ago as a huge ball of swirling dust and gases. Lightning strikes about 6,000 times per minute on earth. and ... Oxygen is the most abundant element in the Earth's crust, waters, and atmosphere (about 49.5%)

Description : Animal General Knowledge Test

Answer : Animal General Knowledge Test The Earth has over 12,00,000 species of animals, 3,00,000 species of plants & 1,00,000 other species. All polar bears are left handed A cow gives nearly 200, ... animal by tearing off with its dagger like claw. The largest frog in the world is called Goliath frog.

Description : DC motor brake test numerical

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Description : Brake test on DC series motor

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%; }

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

Description : What is test bench? Write its applications

Answer : 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.

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

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

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