Electronics and Communication Engineering - Analog Electronics

26. 

Logarithmic amplifiers are used in

A. adders
B. dividers
C. multipliers
D. all of the above

Answer: Option B

Explanation:

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27. 

Figure represents a

A. JFET shunt switching circuit
B. JFET series switching circuit
C. JFET analog switch
D. multiplexing

Answer: Option A

Explanation:

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28. 

In figure VBE = 0.7 V. If base current required to saturate the transistor is 0.1 mA, Vi =

A. 5 V
B. 5.7 V
C. 10 V
D. 10.7 V

Answer: Option B

Explanation:

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29. 

As per miller theorem the circuit of figure (1) can be replaced by that in figure (2) If V1/V2 = K, then Y1 and Y2 are equal to

A. Y(1 - K) each
B. each
C. Y1 = Y(1 - K) and Y2 =
D. Y1 = and Y2 = (1 - K)

Answer: Option C

Explanation:

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30. 

In a biased JFET (Figure) the shape of the channel is as shown because

A. it is the property of material used
B. the drain end is more reverse biased than source end
C. drain end is more forward biased than source end
D. impurity profile changes with distance

Answer: Option B

Explanation:

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