why transformer don't work on DC supply?

asked Dec 9, 2017 by anonymous

why transformer don't work on DC supply?

110 views

Please log in or register to answer this question.

2 Answers

answered Jan 12, 2018 by anonymous

DC can not produce changing magnetic flux that's why.

answered Jul 31, 2018 by anonymous

A DC current does not produce a changing magnetic field which is capable of inducing current on the secondary windings of a transformer through mutual induction process.

← Prev Question Next Question →

Related questions

asked Mar 14, 2018 by anonymous

Why does a transformer only work with an AC supply?

Why does a transformer only work with an AC supply?

Last answer: The transformer work depends on the induction as main principle ,for that AC is the right means

0 like 0 dislike

109 views 3 answers

asked Apr 30, 2018 by anonymous

The inrush current of a transformer at no load is maximum if the supply voltage is switched on

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

Last answer: At 0.866 time voltage value

0 like 0 dislike

80 views 2 answers

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

0 like 0 dislike

232 views 1 answer

asked May 8, 2018 by anonymous

What will happen if the primary of a transformer is connected to D.C. supply?

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

Last answer: 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

0 like 0 dislike

74 views 1 answer

asked Mar 14, 2018 by anonymous

Why does the core of a transformer need to be laminated?

Why does the core of a transformer need to be laminated?

Last answer: Transformer cores are laminated to reduce eddy current loss.

0 like 0 dislike

73 views 1 answer

asked Dec 7, 2017 by jihadio k jeeja

why transformer rating is measured in KVA?

Transformer generally rated in KVA

Last answer: The power of transformer is apparent power because it has no power factor and it is the product of voltage and current.

3 like 0 dislike

132 views 2 answers

asked Oct 5, 2017 by anonymous

is efficiency of transformer is greater than electrical machine and why?

Last answer: The efficiency of transformer is Greater than electrical Machine because there is no rotational losses in transformer and there is no air gap losses in transformer so losses is less in transformer compare to electrical machine so efficiency is higher in case of transformer.

3 like 0 dislike

103 views 3 answers

asked Sep 30, 2017 by anonymous

why the Transformer core is laminated?

Last answer: Transformer core is laminated to reduce Eddy current losses.

0 like 0 dislike

84 views 1 answer

asked Dec 12, 2018 by Manikumar

Why dont we give the main supply and inverter supply to the Appliance

0 like 0 dislike

118 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

0 like 0 dislike

120 views 1 answer

asked Mar 19, 2018 by anonymous

A transformer cannot raise or lower the voltage of a D.C. supply because?

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.

0 like 0 dislike

134 views 1 answer

asked Mar 19, 2018 by anonymous

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

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

0 like 0 dislike

102 views 1 answer

asked Mar 19, 2018 by anonymous

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

Last answer: In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.

0 like 0 dislike

90 views 1 answer

asked May 22, 2020 by anonymous

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

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%.

0 like 0 dislike

31 views 1 answer

asked Apr 28, 2020 by anonymous

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

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

1 like 0 dislike

72 views 0 answers

asked Aug 12, 2018 by anonymous

Why Transformer rating is given in kVA?

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.

1 like 0 dislike

2.7k views 4 answers

asked Dec 9, 2017 by anonymous

Can transformer convert AC to DC?

Can transformer convert AC to DC?

Last answer: No, Transformer cannot convert AC to DC.

4 like 1 dislike

2.9k views 9 answers

asked Apr 27, 2020 by anonymous

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

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

0 like 0 dislike

68 views 0 answers

asked Sep 5, 2018 by anonymous

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

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

0 like 0 dislike

1.5k views 1 answer

asked May 8, 2018 by anonymous

The transformer works on the principle of:

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

Last answer: The transformer works on the principle of: Mutual induction

0 like 0 dislike

58 views 1 answer

asked May 8, 2018 by anonymous

Increasing the number of turns of wire on the secondary of a transformer will

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

Last answer: Increasing the number of turns of wire on the secondary of a transformer will Decrease the secondary current

0 like 0 dislike

507 views 1 answer

asked May 8, 2018 by anonymous

What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to

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

Last answer: 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 ... will be too much high (C) Transformer may start to smoke and burn (D) No effect

0 like 0 dislike

485 views 1 answer

asked May 22, 2020 by anonymous

Explain the effect of Harmonics on the Transformer.

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.

0 like 0 dislike

31 views 1 answer

asked Apr 27, 2020 by anonymous

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

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

0 like 0 dislike

55 views 0 answers

asked Mar 19, 2018 by anonymous

In a transformer the tappings are generally provided on?

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

0 like 0 dislike

53 views 1 answer

asked Mar 19, 2018 by anonymous

The size of a transformer core will depend on?

The size of a transformer core will depend on?

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

0 like 0 dislike

64 views 1 answer

asked Mar 19, 2018 by anonymous

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

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

0 like 0 dislike

271 views 2 answers

asked Mar 19, 2018 by anonymous

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

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.

0 like 0 dislike

84 views 1 answer

asked Mar 19, 2018 by anonymous

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

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

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

0 like 0 dislike

70 views 1 answer

asked Mar 19, 2018 by anonymous

Sumpner's test is conducted on transformer to determine?

Sumpner's test is conducted on transformer to determine?

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

0 like 0 dislike

92 views 1 answer

asked Apr 11, 2018 by anonymous

To enable dc series motor work satisfactory with an AC supply, the following modifications should be done...

To enable dc series motor work satisfactory with an AC supply, the following modifications should be done (1) The yoke and poles should be completely laminated (2) The poles should be made of laminated steel (3) The air gap between stator and rotor be reduced (4) Compensating poles should be introduced

0 like 0 dislike

133 views 0 answers

asked Feb 24, 2018 by Amit Sharma

How IGBT convert DC into AC in solar inverter?

Last answer: Igbt alone cant convert dc to ac. igbt half bridge or full bridge or three phase topology could be used to convert dc to ac. also igbt gates should be driven by microcontroller or pwm/spwm gate driving signals ... e4(-) and g4 c2e1 and c4e3 pins are AC output pins. its name is igbt inverter.

0 like 0 dislike

162 views 1 answer

asked Mar 19, 2018 by anonymous

Star/star transformers work satisfactorily when?

Last answer: Star/star transformers work satisfactorily when load is balanced .

0 like 0 dislike

71 views 1 answer

asked Aug 21, 2019 by anonymous

when charging a battery we use a DC supply but not an AC supply. Why ?

when charging a battery we use a DC supply but not an AC supply. Why ?

Last answer: When power is supplied to the battery, electrolyte inside the battery is divided into positive and negative ions, where ions with similar pole is gained in one side. This reactionʼs flow coincides with direct current.

0 like 0 dislike

79 views 1 answer

asked Aug 12, 2019 by anonymous

Why the Led Glow in Dc Supply ? Whenever give the Ac Supply What is Affect in Led ?

Why the Led Glow in Dc Supply ? Whenever give the Ac Supply What is Affect in Led ?

Last answer: LEDs consume DC current to produce light; with AC current the LED will only be lit when current flow is in the proper direction. AC applied to an LED will cause it to blink on and off, and at high frequency the LED will appear to be lit continuously.

0 like 0 dislike

58 views 1 answer

asked Aug 27, 2019 by anonymous

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

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

0 like 0 dislike

118 views 1 answer

asked Aug 22, 2019 by Iqrima

Transformer is 180 degree phase shifting device.pls explain

0 like 0 dislike

101 views 0 answers

asked Aug 19, 2019 by anonymous

transformer coupled amplifier

transformer coupled amplifier

Last answer: transformer coupled amplifier

0 like 0 dislike

51 views 1 answer

asked Jun 29, 2019 by anonymous

What is auto transformer

0 like 0 dislike

59 views 0 answers

asked Jun 11, 2019 by anonymous

Transformer efficiency

Transformer efficiency

Last answer: Transformer efficiency

0 like 0 dislike

63 views 1 answer

asked Sep 14, 2018 by anonymous

Explain construction and working of isolation transformer.

Explain construction and working of isolation transformer.

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

0 like 0 dislike

622 views 3 answers

asked Sep 14, 2018 by anonymous

Write selection criteria of distribution transformer with any four points.

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

0 like 0 dislike

164 views 2 answers

asked Sep 6, 2018 by anonymous

Write any four advantages of instrument transformer.

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.

0 like 0 dislike

64 views 1 answer

asked Sep 6, 2018 by anonymous

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

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.

0 like 0 dislike

41 views 1 answer

asked Sep 1, 2018 by anonymous

Introduction to transformer

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.

0 like 0 dislike

56 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.

0 like 0 dislike

63 views 0 answers

asked May 8, 2018 by anonymous

Cylindrical type transformer has:

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

Last answer: Cylindrical type transformer has: Single magnetic circuit

0 like 0 dislike

78 views 1 answer

asked May 8, 2018 by anonymous

The rating of transformer may be expressed in ____________.

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

Last answer: The rating of transformer may be expressed in kVA .

2 like 0 dislike

344 views 1 answer

asked May 8, 2018 by anonymous

Which of the following 3-phase connection of a transformer causes interference with the

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

Last answer: Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines: Star-Star

0 like 0 dislike

116 views 1 answer

asked May 8, 2018 by anonymous

Which of the following does not change in a transformer?

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

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

0 like 0 dislike

658 views 1 answer

...