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Electronics questions

Electronics questions | form six Physics

Find Electronics examination questions, form six Physics in acaproso.com

# Question
1

List three properties of operational amplifiers.


Short answers
2

What is meant by the term negative feedback? Give four advantages of using it in an
op-amp or any type of voltage amplifier.


Short answers
3

Define closed loop gain.


Short answers
4

Derive an expression of the closed loop gain for an inverting op-amp voltage amplifier
with an input resistor ​ R1​ ​ and a feedback resistor ​ R2​ .


Mathematical Calculation
5

Calculate the value of output potential ​ V0​ ​in Figure2 if the input potential ​ Vi​ is + 2.0​V. ​

Calculate the value of output potential ​ V 0​ ​ in Figure 2 if the input potential ​ V ​ i​ is + 2.0​ V . ​


Mathematical Calculation
6

Give one advantage of frequency modulation (FM) as compared to amplitude modulation
(AM).


Short answers
7

Briefly explain the importance of bandwidth of an amplitude modulated (AM) signal.


Short answers
8

State the function of a modulator in radios.


Short answers
9

Sketch a block diagram to show the general plan of any communication system.


Short answers
10

The amplitude modulated (AM) broadcast band ranges from 450 to 1200kHz. If each station modulates with audio frequencies up to 5.5kHz, determine the ;
(i) Bandwidth needed for each station.
(ii) Total bandwidth available.


Mathematical Calculation