This set of Analog Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Distortion in Amplifier-1”.
1. The problem in which output signal is not an exact reproduction of output signal in amplifier is collectively called __________
a) Thermal runaway
b) Phase error
c) Distortion
d) Biasing error
Answer: c
Explanation: The deviation of output from an exact copy of input signal with amplification is collectively known as the distortion of the amplifier. They are of a different kind.
2. Which of the following is not a reason for distortion in amplifier output?
a) Incorrect biasing level
b) Sinusoidal input
c) Non- linear amplification
d) Large input signal
Answer: d
Explanation: Incorrect biasing level that is, if biasing level is not properly managed improper gain may lead to distortion. Non-linear amplification is a common reason for distortion in case of transistor. If the input signal is large then output exceed maximum peak of output that can be provided by an amplifier.
3. Amplitude distortion is due to ___________
a) Shift in Q-point
b) Change in input
c) Linear amplification
d) Small input signal
Answer: a
Explanation: If we incorrectly design our amplifier and a change in Q-point occurs, then distortion in the amplifier is observed. Also, if we apply too large an input signal, it may end up causing distortion.
4. If output of amplifier exceeds maximum allowable value, ___________ is occurs in output waveform.
a) Clipping
b) Clamping
c) Rectifying
d) Rounding
Answer: a
Explanation: If amplifier output is beyond maximum value it cannot display voltage further than maximum value. This constitute clipping. This maximum output value depends on the source voltage(VCC) of the amplifier, and can’t exceed the value.
5. Flat tops in the output signal is due to
a) Frequency distortion
b) Amplitude distortion
c) Phase distortion
d) Harmonic distortion
Answer: b
Explanation: If amplifier output is beyond maximum value it cannot display voltage further than maximum value. This constitute clipping and creates flat tops in the output wave. This is due to amplitude distortion in the amplifier.
6. Frequency distortion occurs when _______ is varied with frequency.
a) Amplitude
b) Amplification
c) Distortion
d) Output
Answer: b
Explanation: Due to abnormalities of the transistor level of amplification varies with a frequency which constitutes frequency distortion.
7. Phase distortion can also be called as _________
a) Frequency distortion
b) Amplitude distortion
c) Delay distortion
d) Harmonic distortion
Answer: c
Explanation: Another name of phase distortion is delay distortion. It is called so, because it associated with a delay.
8. The distortion caused by multiple frequencies in output is called _________
a) Amplifier distortion
b) Harmonic distortion
c) Phase distortion
d) None of the mentioned
Answer: b
Explanation: The distortion happened due to the presence of harmonic frequencies in output is known as harmonic distortion.
9. Harmonic distortion is caused by nonlinearities of _________
a) Voltage divider circuit
b) Resistive elements only
c) Passive elements
d) Active elements
Answer: d
Explanation: Harmonic distortion is caused by Active elements in the circuit.
10. Which of the following components in a transistor circuit is really responsible for harmonic distortion?
a) Capacitor
b) Resistor
c) Transistor
d) Inductance
Answer: c
Explanation: Harmonic distortion is caused by Active elements in the circuit. Hence transistor is causing harmonic distortion.
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