Exercise: Analog Electronics

Questions for: Analog Electronics

In figure ID = 4 mA. Then VS =
A:
20 V
B:
4.4 V
C:
0.4 V
D:
0.44 V
Answer: B

VS = ISRS = 4 x 10-3 x 1.1 x 103 = 4.4 V.

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In figure what is the base current if VBE = 0.7 V
A:
10 mA
B:
9.3 mA
C:
10 ΞA
D:
9.3 ΞA
Answer: D

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Maximum efficiency of class B power amplifier is 50%.
A:
True
B:
False
C:
D:
Answer: B

Maximum efficiency for class B-operation can be 78.5% .

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Negative feedback reduces noise originating at the amplifier input.
A:
True
B:
False
C:
D:
Answer: B

It has no effect on noise originating at amplifier input.

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Assertion (A): For large signal variations an amplifier circuit has to be analysed graphically

Reason (R): The output characteristics of a transistor is nonlinear.

A:
Both A and R are correct and R is correct explanation for A
B:
Both A and R are correct but R is not correct explanation for A
C:
A is correct R is wrong
D:
A is wrong R is correct
Answer: A

Since the characteristics is non-linear, graphical analysis is needed.

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