Exercise: Analog Electronics

Questions for: Analog Electronics

In figure as the load resistance is changed
A:
the zener current remain constant
B:
the load current remains constant
C:
the output voltage remains constant
D:
the output voltage and current through R remain constant
Answer: D

Output voltage = 12 V, .

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In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 Ξs wide, the duty cycle of current waveform is
A:
50%
B:
25%
C:
2.5%
D:
0.25%
Answer: C

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The open loop gain of an amplifier is 200. If negative feedback with Îē = 0.2 is used, the closed loop gain will be
A:
200
B:
40.12
C:
4.878
D:
2.2
Answer: C

Closed loop gain = .

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Figure is a 24 Vr stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current are
A:
320 ÎĐ, 10 mA
B:
400 ÎĐ, 15 mA
C:
400 ÎĐ, 10 mA
D:
320 ÎĐ, 15 mA
Answer: D

Max. zener current = .

Maximum load current = 25 - 10 = 15 mA.

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Figure shows the self bias circuit for CE amplifier and its equivalent circuit. VBB and RB respectively are
A:
10 V and 4 k ohm
B:
5 V and 4 k ohm
C:
2 V and 4 k ohm
D:
2 V and 10 k ohm
Answer: C

.

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