98 views

A ferro resonant transformer regulation is also known as?

1 Answer

Answer :

A ferro resonant transformer regulation is also known as constant current transformer.

Like 0 like

Please log in or register to answer this question.

Related questions

144 views

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

1 answer
101 views

Description : A good voltage regulation of a transformer means?

Last Answer : A good voltage regulation of a transformer means output voltage fluctuation from no load to full load is least.

1 answer
5.1k views

Description : A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

Last Answer : 0

3 answers
85 views

Description : Describe the concept of Ferro electricity. Explain the application of Ferro electric material

Last Answer : The ferroelectric material has an electric dipole moment and it is spontaneously polarized. They have high dielectric constant which is nonlinear because it is dependent on the intensity of ... used in condensers to concentrate considerable quantities of electric energy within a small space. 

1 answer
245 views

Description : Negative voltage regulation is indicative that the load is?

Last Answer : Negative voltage regulation is indicative that the load is capacitive.

1 answer
227 views

Description : Minimum voltage regulation occurs when the power factor of the load is?

Last Answer : Minimum voltage regulation occurs when the power factor of the load is leading.

1 answer
466 views

Description : A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is

Last Answer : A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is 500 Hz

1 answer
190 views

Description : In a series L-C circuit at the resonant frequency the?

Last Answer : In a series L-C circuit at the resonant frequency the current is maximum.

1 answer
1.2k views

Description : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?

Last Answer : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of L or C.

1 answer
798 views

Description : In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value?  

Last Answer : In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value will increase the selectivity of the circuit.

1 answer
838 views

Description : In a series resonant circuit, the impedance of the circuit is?

Last Answer : In a series resonant circuit, the impedance of the circuit is minimum.

1 answer
357 views

Description : Define line regulation and load regulation.

Last Answer : Load regulation is the ability of the power supply to maintain its specified output voltage over changes in the load. Line regulation is the ability of the power supply to maintain its specified output voltage over changes in the input line voltage.

3 answers
88 views

Description : Classify hydro-electric power plants according to water flow regulation and explain in brief.

Last Answer : Classification of hydro-electric power plants according to water flow regulation of water flow:-  1. Large reservoir power plant 2. Run-off river (ROR) power plant with poundage 3. Run-off River ... depends upon rate of flow of water Initial cost is less Its purpose is to generate electricity.

1 answer
108 views

Description : Define load and line regulation.

Last Answer : 1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as:  % Load regulation = (VNL-VFL) / VFL *100  ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.  

1 answer
133 views

Description : Identify the increasing order of voltage regulation of the following dc generators a same load :  (A) differential compound, shunt and under compound  (B) shunt, differential compound and ... C) under compound, shunt and differential compound  (D) shunt, under compound and differential compound

Last Answer : Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound 

1 answer
288 views

Description : The unit of speed regulation of a governor is :  (A) Hz (B) Hz/MW (C) Hz/MVA (D) rpm/MVAR

Last Answer : The unit of speed regulation of a governor is : Hz/MW

1 answer
108 views

Last Answer : The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.

1 answer
58 views

Description : Which motor has the best speed regulation?

0 answers
196 views

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.

1 answer
173 views

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.

1 answer
494 views

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

1 answer
64 views

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.

1 answer
503 views

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%.

1 answer
406 views

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

2 answers
263 views

Description : Single phase transformer

Last Answer : Single phase Transformer Transformer

1 answer
162 views

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. 

1 answer
250 views

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

1 answer
115 views

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

0 answers
148 views

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.

1 answer
386 views

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

1 answer
98 views

Last Answer : No-load current in a transformer lags behind the voltage by about 75°.

1 answer
220 views

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

1 answer
264 views

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

1 answer
369 views

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.

1 answer
88 views

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

1 answer
379 views

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

1 answer
118 views

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

1 answer
192 views

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

1 answer
139 views

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

1 answer
152 views

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

1 answer
95 views

Last Answer : Transformer breaths in when load on it decreases.

1 answer
75 views

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

1 answer
558 views

Last Answer : The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.

1 answer
65 views

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

1 answer
95 views

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

1 answer
129 views

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

1 answer
197 views

Last Answer : The chemical used in breather for transformer should have the quality of cleansing the transformer oil.

1 answer
348 views

Last Answer : An ideal transformer has infinite values of primary and secondary inductances. The statement is false.

1 answer
332 views

Last Answer : The transformer ratings are usually expressed in terms of kVA.

1 answer
257 views

Last Answer : Material used for construction of transformer core is usually silicon steel.

1 answer
...