Amplifier Frequency Response Questions and Answers

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Showing 10 of 21 questions
Q1
Doubling the voltage gain causes a ________ dB ________.
  • A 10, increase
  • B 6, increase
  • C 10, decrease
  • D 6, decrease
Answer: Option B
Q2
________ frequencies are values of frequency at which the RC circuits reduce the voltage gain to 70.7% of its midrange value.
  • A Critical
  • B Cutoff
  • C Corner
  • D all of the above
Answer: Option D
Q3
A roll-off of 20 dB per decade is equivalent to a roll-off of ________ per octave.
  • A 3 dB
  • B 13 dB
  • C 12 dB
  • D 6 dB
Answer: Option D
Q4
Each RC circuit causes the gain to drop at a rate of ________ dB/decade.
  • A 20
  • B 10
  • C 6
  • D none of the above
Answer: Option A
Q5
The phase shift through the input of an RC circuit approaches ________° as the frequency approaches zero.
  • A 0
  • B 45
  • C 180
  • D 90
Answer: Option D
Q6
A certain amplifier has a bandwidth of 22.5 kHz with a lower cutoff frequency of 600 Hz. What is the value of fcu?
  • A 600 Hz
  • B 22.5 kHz
  • C 23.1 kHz
  • D 21.9 kHz
Answer: Option C
Q7
Internal transistor junction capacitances affect the high-frequency response of amplifiers by
  • A reducing the amplifier's gain.
  • B introducing phase shift as the signal frequency increases.
  • C having no effect.
  • D reducing the amplifier's gain and introducing phase shift as the signal frequency increases.
Answer: Option D
Q8
What is the method that can be used to determine the values of fcl and fcu of an amplifier?
  • A five time constants
  • B step-response
  • C sinusoidal
Answer: Option B
Q9
An amplifier has an input signal voltage of 0.054 mV. The output voltage is 12.5 V. The voltage gain in dB is
  • A 53.6 dB.
  • B 107.3 dB.
  • C 231 dB.
  • D 116 dB.
Answer: Option B
Q10
The lower critical frequency is also known as the
  • A break frequency.
  • B cutoff frequency.
  • C corner frequency.
  • D all of the above
Answer: Option D

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