Analog Electronics
In following figure find VGG by assuming gate current is negligible for the p-channel JFET. (if IDQ = - 6 mA, RS = 0, VDD = -18 V, RD = 2 kΩ, IDSS = - 10 mA, IPO = - 3 V)
Answer: A
If Gate current is considered to be negligible then VGG = VGSQ
and 
.
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Which of the following oscillators is suitable for frequencies in the range of mega hertz?
Answer: C
Only LC oscillators are suitable for MHz range.
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Consider the following statements : A clamper circuit
1.adds or subtracts a dc voltage to a waveform
2.does not change the waveform
3.amplifiers the waveform
Which are correct?
Answer: A
Clamper does not amplify the waveform. Hence 1 and 2 are correct.
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For a system to work, as oscillator the total phase shift of the loop gain must be equal to
Answer: D
Gain of system with + ve feedback = 
for oscillation
but V0 ≠ 0
so, that 1 - AB = 0 
AB = 1 ∠0° or 360°.
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In a commercially available good power supply the voltage regulation is about
Answer: A
A good power supply does not allow output voltage to vary by more than 1% .
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A half wave diode rectifier has a capacitance input filter. If input voltage is Vm sin ωt, PIV is
Answer: B
Because capacitor charge is retained.
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The self bias provides
Answer: A
Stable Q point is the advantage of self bias circuit.
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A typical value of gm for a FET is about 25 μs.
Answer: B
gm is about 0.1 x 10-3 siemens.
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In class C operation of an amplifier circuit, the collector current exists for
Answer: D
In class C operation output is in the form of short duration pulses.
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The main advantage of CMOS circuit is
Answer: C
Low power consumption is a big advantage in digital circuits.
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