FEEDBACK AMPLIFIER ( MODIFIED)
Authored by Ajitsinh Jadhav
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University - Professional Development
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50 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
An emitter follower circuit has hie= 1275 Ω, hfe=98, RL= 3.3 KΩ, RB=220 KΩ then current gain & voltage gain are _________________.respectively.
39.75 & 0.996
45 & 1.5
45 & 0.996
39.75 & 1.5
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The total harmonic distortion is reduced from 15% to 3% , when 4% negative feedback is used. The voltage gain without & with feedback are respectively.
150 & 20
100 & 33.33
100 & 20
150 & 33.33
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
An amplifier with mid band gain of 500 has negative feedback β= 1/100. If the upper cut off frequency without feedback is 60 K Hz then, with feedback it would becomes______.
10 KHz
12 KHz
300 KHz
360 KHz
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
An emitter follower is widely used in electronic instruments as__________.
its voltage gain is very high
its voltage gain never exceeds unity.
its output impedance is high & input impedance is low
its input impedance is high & output impedance is low.
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
An emitter follower is mainly used as_________________.
an impedance matching device
a power amplifier
a follower of base signal
voltage amplifier
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Feedback in an amplifier increases the input impedance from 1 KΩ to 40 KΩ because of _____________.
Positive feedback
shunt-current negative feedback
series-current negative feedback
shunt- voltage negative feedback
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The shunt derived series- fed feedback in an amplifier_________.
1. Increases its input impedance
2. increases its output impedance
3. decreases its output impedance
4. decreases its input impedance
of these statements-
1 & 3 are correct
1 & 2 are correct
3 & 4 are correct
2 & 4 are correct
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