Differentiate between Natural and Forced commutation

Define natural, mechanical, forced and induced draught systems.
Answer : Natural draught system: - When the fuel is burnt (combustion) in the furnace due to natural circulation of air, the draught is called natural draught. Mechanical draught system: - In a mechanical ... combustion. OR If fan/blower is placed after the furnace then it is called as induced draught ...

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by anonymous asked Sep 21, 2017 83 views

What is mean by natural commutation of thyristor?

Answer : Natural commutation is also called as line Communication. The turning off of thyristor due to AC supply is called natural commutation or line commutation. If the thyristor is connected to AC supply ... connected to positive and anode terminal get connected to negative, this turns off the thyristor....

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by anonymous asked Feb 20, 2018 539 views

What is the difference between beta and forced beta for BJT?

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by anonymous asked May 21, 2020 78 views

For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.

For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.
Answer : Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated. ...

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anonymous · Answer 1 · 2019-10-13T04:16:02+0000

Natural commutation	Forced commutation
Source is AC	Source is DC
External commutating componants are not required	External commutating componants are required
SCR turns off when its forward current goes below the holding current when the AC input changes	Conducting SCR turns off by applying a reverse voltage across it or a reverse current pulse is forced through conducting SCR
Cost of commutating circuit is less	Cost of commutating circuit is more
Used in controlled rectifiers, AC voltage controllers etc.	Used in choppers & inverters etc

Differentiate between Natural and Forced commutation

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