Define Dielectric Strength for transformer oil. State its value for new transformer oil.
Last Answer : Dielectric strength is defined as the maximum voltage that can be applied to across to the Fulid with out electrical breakdown is called Dielectric strength.
Show More
85 views
1 answer
asked
Apr 16, 2020
by
anonymous

Define : (i) Dielectric strength (ii) Breakdown voltage
Last Answer : (i) Dielectric strength: The voltage which a dielectric material can withstand without breaking down (without losing its dielectric property) is called its dielectric strength. It is represented by kV/mm ... or is no longer an insulator) for a specified thickness, is its breakdown voltage.
Show More
109 views
1 answer
asked
Sep 4, 2018
by
anonymous

What is dielectric strength of an insulating material? What is its unit?
Last Answer : Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm
Show More
112 views
1 answer
asked
Sep 4, 2018
by
anonymous

What is dielectric breakdown strength?
Show More
77 views
0 answers
asked
Mar 10, 2018
by
anonymous

63 The dielectric strength of transformer oil is expected to be A. 1kV B. 33kV C. 100kV D. 330 kV
Last Answer : B. 33kv
Show More
16 views
1 answer

Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk
Last Answer : (i) Polyvinyl Carbide(PVC):it is used in insulation of wires and cables in domestic wiring as well as in aircraft and factory wiring (any one) (ii) Glass: 1) Alkaline glasses are used for ... with wax or varnishes are used in windings of magnet coils and small medium sized mechanics (any one)
Show More
138 views
1 answer
asked
Aug 4, 2019
by
anonymous

State any four dielectric materials.
Last Answer : Ceramics, distilled water, paper, mica, polyethylene, and glass. Metal oxides
Show More
74 views
1 answer
asked
Aug 4, 2019
by
anonymous

The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)
Last Answer : The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)
Show More
162 views
1 answer
asked
Apr 30, 2018
by
anonymous

The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.
Last Answer : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.
Show More
120 views
1 answer
asked
Apr 28, 2018
by
anonymous

The frequencies and voltage used in Dielectric heating are (A) 10 – 30 MHz, upto 25 kV (B) 50 – 60 Hz, upto 25 kV (C) 10 – 30 MHz, upto 100 V (D) 50 – 60 Hz, 110 V – 230 V
Last Answer : The frequencies and voltage used in Dielectric heating are 10 – 30 MHz, upto 25 kV
Show More
118 views
1 answer
asked
Apr 28, 2018
by
anonymous

Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge
Last Answer : Dielectric loss in a capacitor is best measured by Schering Bridge
Show More
139 views
1 answer
asked
Apr 25, 2018
by
anonymous
.jpg)
What is the difference between an insulator and a dielectric?
Last Answer : Dielectric is the another name for insulator.
Show More
113 views
1 answer
asked
Mar 11, 2018
by
anonymous

What is meant by dielectric heating?
Show More
84 views
0 answers
asked
Mar 11, 2018
by
anonymous

What is dielectric withstand voltage?
Show More
62 views
0 answers
asked
Mar 10, 2018
by
anonymous

Has anyone (in this case a true warrior) ever made you feel like a giant ass, but in a really good way? (Someone that inspires you with their strength and determination)
Last Answer : I’m having a hard day today. Someone I really love and look up to has read me the riot act and made me feel terrible. It hasn’t or doesn’t help me or inspire me and it doesn’t make me feel good. Sorry it is just a really hard day and things are pretty rough.
Show More
1 view
1 answer
asked
Feb 27
by
anonymous

A magnetic circuit has effective iron length of 100 cm and it is wound with 800 turns of wire carries 1 A. Find the magnetic field strength.
Last Answer : magnetic field strength
Show More
267 views
1 answer
asked
Mar 30, 2020
by
anonymous

Give the relation between magnetic field strength, magnetic flux density and permeability.
Show More
84 views
0 answers
asked
Aug 8, 2018
by
anonymous

Define magnetic field strength and state its unit.
Last Answer : Magnetic field strength is the force experienced by a unit N-pole when placed at any point in a magnetic field is known as magnetic field strength or magnetizing force. Magnetising force or magnetic field ... unit of length is metre. So the unit of magnetic field strength is ampere turns per metre.
Show More
109 views
1 answer
asked
Aug 8, 2018
by
anonymous

The electric breakdown strength of insulating materials depends on (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these
Last Answer : The electric breakdown strength of insulating materials depends on (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these
Show More
991 views
1 answer
asked
May 8, 2018
by
anonymous

What are three ways you can increase the strength of an electromagnet?
Show More
77 views
0 answers
asked
Mar 14, 2018
by
anonymous

Last Answer : A transformer oil must be free from moisture.
Show More
68 views
1 answer
asked
Mar 19, 2018
by
anonymous
.jpg)
Last Answer : Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds 150°C.
Show More
197 views
1 answer
asked
Mar 19, 2018
by
anonymous

How impressive is my record for this physical challenge?
Last Answer : Cool, but I don’t think anyone would really care except you. What does hitting the headlight on your boat have to do with anything, I don’t get it. lol
Show More
0 views
1 answer
asked
Mar 1
by
anonymous

What beauty comes from tragedy?
Last Answer : answer:Henryk Mikolaj Górecki turned the tragedy of the Holocaust into incredibly beautiful, soul-stirring music, LENTO SOSTENUTO TRANQUILLO MA CANTABILE (from Symphony No. 3, Symphony of Sorrowful Songs ). Sorry, ... commercial to get through on YouTube, but it's worth it to listen to this music.
Show More
1 view
1 answer
asked
Feb 28
by
anonymous

Was there ever a bad time in your life that you later look upon with nostalgia?
Last Answer : answer:Definitely can relate; I even asked a similar question awhile back. For me it was being very ill; I know it sounds pretty mental to miss being ill, but sometimes when responsibilities pile up, I ... when my only priority was to get better. Usually I'm very glad to be healthy now, though.
Show More
0 views
1 answer
asked
Feb 27
by
anonymous

How can I stop being this sensitive?
Last Answer : Take your time making your mind up about a person. Value yourself and the time you give to people.:)
Show More
1 view
1 answer
asked
Feb 27
by
anonymous

Does your state have a strong Citizens Arrest Law?
Last Answer : In Wisconsin, it’s not even clear if an airport security guard can detain someone he witnesses committing a crime on video monitor.
Show More
1 view
1 answer
asked
Feb 27
by
anonymous

Can Wii Fit help me gain muscle?
Last Answer : No. Even its aerobic “improvement” claims are often disputed.
Show More
1 view
1 answer
asked
Feb 27
by
anonymous

Is there anything that you have ever been through in your life where afterwards you realized that you're a stronger person than you thought previously?
Last Answer : Suicide of my first husband then later the suicide of my baby brother, who had found my first husband. The only way I survived was my kids and the Grace of God.
Show More
2 views
1 answer
asked
Feb 26
by
anonymous

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.
Show More
127 views
1 answer
asked
May 22, 2020
by
anonymous

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
Show More
150 views
1 answer
asked
May 22, 2020
by
anonymous

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.
Show More
54 views
1 answer
asked
May 22, 2020
by
anonymous

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%.
Show More
270 views
1 answer
asked
May 22, 2020
by
anonymous

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
Show More
381 views
2 answers
asked
May 17, 2020
by
anonymous

Single phase transformer
Last Answer : Single phase Transformer Transformer
Show More
261 views
1 answer
asked
May 16, 2020
by
anonymous
.jpg)
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.
Show More
159 views
1 answer
asked
May 15, 2020
by
anonymous

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
Show More
248 views
1 answer
asked
May 10, 2020
by
anonymous

Even at no-load, a transformer draws current from the mains. Why?
Show More
114 views
0 answers
asked
Apr 28, 2020
by
anonymous

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.
Show More
179 views
1 answer
asked
Jul 27, 2019
by
anonymous

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.
Show More
132 views
1 answer
asked
Jul 27, 2019
by
anonymous

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
Show More
345 views
1 answer
asked
Jul 26, 2019
by
anonymous

Last Answer : No-load current in a transformer lags behind the voltage by about 75°.
Show More
90 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.
Show More
203 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : In the transformer low voltage winding has got more cross-sectional area.
Show More
256 views
1 answer
asked
Mar 19, 2018
by
anonymous

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.
Show More
344 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : Primary winding of a transformer could either be a low voltage or high voltage winding.
Show More
86 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : High voltage winding in a transformer has more number of turns.
Show More
363 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : The efficiency of a power transformer is of the order of 98 percent.
Show More
99 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : The no load current in a transformer lags behind the applied voltage by an angle of about 75°.
Show More
188 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : In a transformer, routine efficiency depends upon load current and power factor of load.
Show More
133 views
1 answer
asked
Mar 19, 2018
by
anonymous
