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Answer :

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

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.

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 breakdown strength?