Exercise: Analog Electronics

Questions for: Analog Electronics

In figure base current is 10 ΞA and Îēdc = 100. Then VE =
A:
5 V
B:
10 V
C:
15 V
D:
20 V
Answer: C

IC = 1 mA and VCE = 20 - 5 x 103 x 1 x 10-3 = 15 V.

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For transistor 2 N 338 the manufacturer specifies Pmax = 100 mW at 250°C free air temperature and maximum junction temperature of 125°C. Its thermal resistance is
A:
10° C/W
B:
100° C/W
C:
1000° C/W
D:
5000° C/W
Answer: C

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In calculating output impedance of an amplifier the source is replaced by an open circuit.
A:
True
B:
False
C:
D:
Answer: B

It is replaced by short circuit.

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The Vo of the op-amp circuit shown in the given is
A:
11 Vi
B:
10 Vi
C:
Vi
D:
zero
Answer: D

V0 = (Vs2 - Vs1)

[Vs1 - Vs1] = 0.

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In a class C power amplifier the input frequency of ac signal is 1 MHz. If tank circuit has C = 1000 pF, the value of L =
A:
25 ΞH
B:
50 ΞH
C:
100 ΞH
D:
200 ΞH
Answer: A

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