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WorksheetsFeedback Amplifiers
Total questions: 10
Worksheet time: 9mins
The term (1+Aβ) is called as
De-sensitivity
Sensitivity
Loop Gain
None
Which of the following is correct with respect to transresistance amplifier?
Output current is proportional to the signal current
Output voltage is proportional to the signal current
Output voltage is proportional to the signal voltage
Output current is proportional to the signal voltage
The regenerative feedback amplifier overall gain is given by
Af = A/(1+Aβ)
Af = 1-Aβ
Af = A/(1-Aβ)
Af = 1+Aβ
When current feedback (negative) is applied to an amplifier, its output impedance....
is decreased
is increased
remains the same
none of the above
If Av and Af are the voltage gains of an amplifier without feedback and with negative feedback respectively, then feedback fraction is...
(1/Av) + (1/Af)
(1/Av) - (1/Af)
(1/Af) - (1/Av)
(Av/Af) - (1/Av)
The essential conditions for sustained oscillation are
|Aβ|=1 & ∠Aβ=0
|Aβ<1 & ∠Aβ=0
|Aβ|>1 & ∠Aβ=0
|Aβ|<1 & ∠Aβ=180o
A Hartley oscillator is used for generation of
Very low-frequency oscillation
Radio-frequency oscillation
Microwave oscillation
Audio-frequency oscillation
The gain of cascaded amplifier is equal to the
Product of individual gains
Sum of individuals gain
Ratio of stage gains
none of these
The degenerative feedback amplifier overall gain is given by
Af = A/(1+Aβ)
Af = 1+Aβ
Af = A/(1-Aβ)
Af = 1-Aβ
Identify the type of sampling and mixing in the following amplifier.
Shunt/Voltage sampling, Series/Voltage mixing
Series/Current sampling, Series/Voltage mixing
Series/Current sampling, Shunt/Current mixing
Shunt/Voltage sampling, Shunt/Current mixing
