Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

5. 

A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is

[A]. 100
[B]. 99
[C]. 1.01
[D]. 0.99

Answer: Option A

Explanation:

Current gain = 1 + β = 100.


Rakesh said: (Feb 1, 2015)  
Sir I don't know about CB and CC please tell me briefly?

Kamran Saifi said: (Feb 3, 2015)  
CB is Common Base & CC is Common Collector mode. The current gain in CB mode is Ic/Ie & for CC mode it is Ic/Ib.

Nandan Kumar said: (Feb 17, 2015)  
Please tell me about CB mode is Ic/Ie & CC mode is Ic/Ib.

R.Gayathri said: (Jul 14, 2015)  
It was good give brief explanation.

Dilip said: (Sep 7, 2015)  
CB = ic/ie.

CC = ic/ib.

Hussain said: (Nov 10, 2015)  
Ic/ie = Alpha.

Ic/ib = beta, b = a/(1-a).

A given = 0.99.

So b = 99 = 1+99 = 100.

Billz said: (Dec 26, 2015)  
Why are you adding 1 to 99?

Ajay P Roy said: (May 31, 2016)  
In CB config: CURRENT GAIN (ALPHA, a) : Ic/Ie=.99 (given).

In CE config: CURRENT GAIN (BETA, b) : Ic/Ib.

In CC config: CURRENT GAIN (gamma, g) : Ie/Ib.

And b = a/(1 - a).

Then, g = 1 + b.

Therefore: g = 1 + (a/(1 - a)).

g =1/(1 - a) = 1/(1 - .99) = 1/.01 = 100.

Gouarv said: (Jan 17, 2017)  
Very helpful, Thanks @Ajay P Roy.

Sai Kumar Kunchala said: (Apr 27, 2017)  
Excellent explanation Thanks, @Ajay.

Pallavi Roy said: (Jun 7, 2017)  
Clearly explained, Thanks @Ajay.

Ankesh said: (Jul 22, 2017)  
Thanks @Ajay!

K V Satyanarayana said: (Aug 30, 2017)  
Thanks @Ajay.

Chandra said: (Sep 12, 2017)  
Thanks @Ajay.

Venky said: (Oct 28, 2017)  
Thanks @Ajay.

Gurunadham said: (Nov 27, 2017)  
γ=1+β=α/(1-α).

Chaitanya said: (Dec 11, 2017)  
Thanks @Ajay.

Faizi said: (Feb 18, 2018)  
Thanks @Ajay.

Monika said: (Feb 22, 2018)  
Thanks a lot @Ajay.

Ashvani Jha said: (Feb 26, 2018)  
Please explain about CB and CC.

Pawan said: (Apr 11, 2018)  
Thanks @Ajay.

Saravana said: (Apr 23, 2018)  
The explanation is super, Thanks @Ajay.

Sreeju said: (Jul 19, 2018)  
Γ=1÷(1-α).

Nimrod said: (Aug 5, 2018)  
Why do we change modes from CC to CB or vice versa?

What is the practical application of changing transistor modes?

Nallendran said: (Feb 24, 2019)  
Thanks for the answer @Ajay.

Saipriya said: (Apr 9, 2019)  
Helpful, Thanks for the answer @Ajay.

Jyoti Prasad said: (Nov 12, 2019)  
Y-> gama B-> beta < ---> alpha

Y = B+1 = 1/1- < = 1/(1-0.99) = 100.

Satyam said: (Dec 9, 2019)  
Very clearly explained thanks @Ajay.

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