Exercise: Analog Electronics

Questions for: Analog Electronics

The JFET in the circuit shown in figure has an IDSS = 10 mA and Vp = -5V. The value of the resistance Rs for a drain current IDS = 6.4 mA is
A:
156 Ω
B:
470 Ω
C:
560 Ω
D:
1 kΩ
Answer: A

VGS = - 1 V

IDS.RS = - VGS

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An ideal op-amp requires
A:
zero input offset voltage
B:
low input offset voltage
C:
high input offset voltage
D:
infinite input offset voltage
Answer: A

An ideal Op-amp has identical transistors and hence does not require input offset voltage.

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It is desired to reduce distortion in an amplifier from 8% to 2% by using 5% negative feedback. The open and closed loop gains respectively are
A:
60 and 15
B:
15 and 60
C:
6 and 1.5
D:
1.5 and 6
Answer: A

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If the midband gain of an amplifier is 40 dB, the gain at half power frequency is
A:
37 dB
B:
30 dB
C:
20 dB
D:
13 dB
Answer: A

Half power frequency is -3 dB frequency.

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A full wave rectifier circuit using centre tapped transformer, the input frequency 50 Hz. The frequency of output is
A:
100 Hz
B:
50 Hz
C:
25 Hz
D:
none of the above
Answer: A

There are two output waves in one cycle of input wave.

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