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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 2
1.
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
320 Ω, 10 mA
400 Ω, 15 mA
400 Ω, 10 mA
320 Ω, 15 mA
Answer: Option
Explanation:

Max. zener current = .

Maximum load current = 25 - 10 = 15 mA.

2.
The open loop gain of an amplifier is 200. If negative feedback with β = 0.2 is used, the closed loop gain will be
200
40.12
4.878
2.2
Answer: Option
Explanation:

Closed loop gain = .

3.
In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is
50%
25%
2.5%
0.25%
Answer: Option
Explanation:

4.
In figure as the load resistance is changed
the zener current remain constant
the load current remains constant
the output voltage remains constant
the output voltage and current through R remain constant
Answer: Option
Explanation:

Output voltage = 12 V, .

5.
In figure, voltage across R2 = + 10 V. If VBE = 0.7 V and VE = 0.7 V and RE = 10 kΩ, current through RE is
1 mA
0.93 mA
2 mA
1.86 mA
Answer: Option
Explanation:

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