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What is dielectric breakdown strength?

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Description : Define : (i) Dielectric strength (ii) Breakdown voltage

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. 

Description : 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

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

Description : What is dielectric strength of an insulating material? What is its unit?

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

Description : Define Dielectric Strength for transformer oil. State its value for new transformer oil.

Description : The dielectric strength of transformer oil is expected to be?

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

Description : What is dielectric withstand voltage?

Description : Explain zener breakdown and avalanche breakdown.

Answer : The Zener Breakdown and Avalanche Breakdown are two different mechanisms by which a PN junction breaks. The Zener and Avalanche breakdown both occur in diode under reverse bias. The avalanche breakdown ... in the PN junction and causes breakdown. The process is known as the Avalanche breakdown.

Answer : No MOSFET do not have a second breakdown problem.

Answer : Yes BJT have second breakdown problem.

Description : What are three ways you can increase the strength of an electromagnet?

Description : What is the difference between an insulator and a dielectric?

Answer : Dielectric is the another name for insulator.

Description : What is meant by dielectric heating?

Description : 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.

Answer : magnetic field strength

Description : Give the relation between magnetic field strength, magnetic flux density and permeability.

Description : Define magnetic field strength and state its unit.

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.

Description : Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk

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) 

Description : State any four dielectric materials.

Answer : Ceramics, distilled water, paper, mica, polyethylene, and glass. Metal oxides

Description : 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)

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)

Description : 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.

Answer : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.

Description : 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

Answer : The frequencies and voltage used in Dielectric heating are 10 – 30 MHz, upto 25 kV

Description : Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

Answer : Dielectric loss in a capacitor is best measured by Schering Bridge

Description : Define breakdown voltage and dielectric strength of a capacitor.

Answer : Breakdown Voltage: The voltage at which the dielectric material breaks down (Starts conducting or is no longer remains as an insulator) for a specified thickness, is called its breakdown ... without breaking down (without losing its dielectric property) is called its dielectric strength. 

Description : The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to   (A) Polarization (B) Conductivity (C) Structural homogeneties (D) Ionization

Answer : The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to Conductivity 

Description : Breakdown voltage and Di-electric strength

Description : Define dielectric strength for a capacitor.

Answer : Ans: Di-electric Strength for a capacitor: The voltage which a dielectric material can withstand without breaking down (without losing its dielectric property) is called as dielectric strength.

Description : For an insulating material, dielectric strength and dielectric loss should be respectively   (A) high and high (B) low and high (C) high and low (D) low and low.

Answer : For an insulating material, dielectric strength and dielectric loss should be respectively  high and low 

Description : The dielectric strength of impregnated papers is about   (a) 20 kV/mm (b) 30 kV/mm (c) 15 kV/mm (d) 5 kV/mm 

Answer : The dielectric strength of impregnated papers is about 30 kV/mm

Description : The dielectric strength of ferromagnetic materials depends to a large extent on (a) Intensity of electric field (b) Presence of magnetic materials in vicinity (c) Area of hysterisis loop for materials (d) Frequency of applied voltage

Description : At atmospheric pressure, the dielectric strength of SF6 is about   (a) 2.5 times of air (b) 2.5 times of oil (c) 2.5 times of vacuum (d) None of the above 

Answer : Dielectric Constant and Dielectric Strength are same.

Description : The tapetum in which radial walls breakdown early are called as

Answer : The tapetum in which radial walls breakdown early are called as – Amoeboid tapetum

Description : Compare avalanche and zener breakdown.

Answer : Sr. No. Avalanche breakdown Zener breakdown 1 PN junction are lightly doped in avalanche breakdown PN junction are heavily doped in zener breakdown 2 The avalanche breakdown ... 4 Electron hole pairs are generated  Large number of holes and electrons are produced 

Description : Describe avalanche and zener breakdown of PN junction with neat graph.

Answer : Avalanche Breakdown It is observed in diodes having Vz> 8V. is called Avalanche Breakdown It occurs due to accelerating minority carriers. It shows gradual change. Breakdown voltage ... field. Breakdown is very sharp. Breakdown voltage decreases with increase in temperature 

Description : The liberation of oxygen during photosynthesis is due to (1) hydrolysis of carbohydrates (2) photolysis of water (3) reduction of CO2 (4) breakdown of chlorophyll

Answer : photolysis of water

Description : Explain breakdown maintenance. Give any two disadvantages of it.  

Answer : Breakdown maintenance: This method of maintenance implies that repairs are made after the equipment is out of order and it cannot perform its normal function any longer. In such situation, ... those plant items which are regulated by statutory provision eg. Cranes, lifts, and pressure vessels.

Description : Which among the given statement is/are CORRECT. (a) Avalanche breakdown voltage increases with temperature (b) Zener breakdown voltage decreases with temperature A) Only (a) B) Only (b) C) Both (a) & (b) D) None of (a) & (b)

Answer : Which among the given statement is/are CORRECT. (a) Avalanche breakdown voltage increases with temperature (b) Zener breakdown voltage decreases with temperature A) Only (a) B) Only (b) C) Both (a) & (b) D) None of (a) & (b)

Description : The reverse breakdown phenomenon in a zener diode is known as

Answer : The reverse breakdown phenomenon in a zener diode is known as Avalanche effect

Description : Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are ... vertically oriented structure supports large blocking voltages. Which of the above statements is/are correct ?

Answer : Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are less due to ... large blocking voltages. Which of the above statements is/are correct ? 2 only

Description : In IC, transistors are utilised as diodes.To get highest breakdown voltage for such diode, it is adjusted to have  A) Ie=0 B) Ic=0 C) Vcb=0 D) Vce=0 

Description : What are the losses in a transmission line?

Description : What is meant by flash over voltage?

Description : What is the difference between line and phase current?

Answer : The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current

Description : What is the lowest acceptable insulation resistance for a cable?

Description : What is the purpose of using a Megger?

Description : What do you mean by insulation coordination?

Description : What does BIL stand for in electrical terms?

Answer : BIL stands for Basic Insulation Level.

Description : What is a safe distance from power lines?

Description : What is the definition of extra low voltage?

Answer : Extra-low voltage (ELV) is an electricity supply voltage in a range which carries a low risk of dangerous electrical shock.

Description : What is the difference between line and phase voltage?

Answer : Line voltage  is  voltage  between two  phases R &Y  (415 v)  while  phase  voltage  is  the  voltage  between  one  phase and  a neutral  B &  N   (240 v).

Description : What is a Ductor tester used for?

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