Electronics and Communication Engineering - Analog Electronics

21. 

In a BJT amplifier circuit the size of coupling capacitor depends on

A. lowest frequency
B. highest frequency
C. average of lowest and highest frequencies
D. none of the above

Answer: Option A

Explanation:

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22. 

In a closed loop non-inverting amplifier, constructed using single break-frequency op-amp, bandwidth with feedback can be written as. (f0 - break frequency, β - gain of the feedback circuit, A - open loop voltage gain, Af - closed loop voltage gain)

A.
B.
C.
D.

Answer: Option A

Explanation:

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23. 

A silicon sample A is doped with 1018 Atoms/cm3 of Boron. Another sample B of identical dimensions is doped with 1018 atoms/cm3 of phosphorus. The ratio of electron to hole mobility is 3. The ratio of conductivity of the sample A to B is

A. 3
B. 1/3
C. 2/3
D. 3/2

Answer: Option B

Explanation:

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24. 

Which of the following circuit has the greatest bandwidth?

A. fr = 455 MHz; Q = 10
B. fr = 455 MHz; Q = 100
C. fr = 1 MHz; Q = 100
D. fr = 1 MHz; Q = 10

Answer: Option D

Explanation:

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25. 

A FET is a __________ controlled device whereas a bipolar transistor is a __________ controlled device.

A. gate, drain
B. drain, gate
C. current, voltage
D. voltage, current

Answer: Option D

Explanation:

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