
module 4 and 5
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Education
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Practice Problem
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Hard
Dr. Mary
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Choose the effect of negative feedback amplifier
Decrease the distortion
Increase the noise
Increase the voltage gain
2.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Determine the voltage gain with feedback for voltage series feedback having A= -150, Zi = 20KΩ, Zo = 50kΩ for feedback of β = -0.2
-4.83
-3.34
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Name the circuit which has employed negative feedback.
Amplifier
Oscillator
Filter
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Select the feedback system in which the feedback signal is fed in phase with input signal.
Positive
negative
both negative and positive
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Predict the output of a practical differential amplifier, if same signal is applied to both inputs.
not equal to zero
same as the input signal
zero
6.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Recall the expression of closed loop voltage gain (AF) in terms of open loop gain (A) and feedback factor (β)
AF =A/Aβ
AF =A/(1+Aβ)
AF =A/A-β
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Choose the amplifier in which the input impedance can be decreased from 5KΩ to 1kΩ.
Voltage shunt feedback amplifier
Voltage series feedback amplifier
Current amplifier
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