Analog Electronics
The disadvantage of direct coupled amplifiers is
Answer: A
The drift is amplified by different stages.
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In a self bias circuit for CE amplifier, the emitter resistance is made three times the original value. The collector current will
Answer: D
The emitter current becomes one-third since collector current in BJT is almost the same as emitter current, collector current also becomes one-third.
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To prevent a DC return between source and load, it is necessary to use
Answer: C
Capacitor offers infinite impedance to DC.
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Assertion (A): Negative feedback reduces the bandwidth of an amplifier
Reason (R): Negative feedback stabilizes the gain of an amplifier
Answer: D
A is wrong because negative feedback increases the bandwidth.
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In an amplifier the voltage gain is the ratio of
Answer: C
Voltage gain is always the ratio of output and input voltages.
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In following figure find VDSQ 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: B
By Appling KVL around drain source loop.
VDSQ = -18 - (-6). 2 x 103 = - 18 + 12 k x 10-3 
-6 V.
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In an amplifier with a gain of - 1000 and feedback factor β = - 0.1, the change in gain is 20% due to temperature. The change in gain for feedback amplifier will be
Answer: C
. When gain changes,
age change in
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For dc the current through coupling capacitor in CE amplifier circuit is
Answer: D
dc remains confined within BJT. Only ac signal comes out.
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In a half wave diode rectifier circuit the current flows in the load circuit for
Answer: B
Current flows during positive half cycle.
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An R-C coupled amplifier has mid-frequency gain of 200 and a frequency response from 100 Hz to 20 kHz. A negative feedback network with β = 0.2 is incorporated into the amplifier circuit, the Bandwidth will be
Answer: C
B.W. = fH' - fL' .
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