Question 21 : If D1, D2, D3, D4 are the distortion produced by second, third, fourth, fifth respectively (others are insignificant). Then total harmonic distortion is __________
1. v(D1²+D2²+D3²+D4²)
2. v(D1²+D3²)
3. v(D2²+D4²)
4. v(D1²+D2²)
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Question 22 : In three-point method the harmonics which are considered for calculating distortion is __________
1. First harmonics only
2. First and Second harmonics only
3. First, Second and Third harmonics only
4. Second and Third harmonics only
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Question 23 : Power delivered to load is _________ with increase in harmonic distortion.
1. Increases
2. Decreases
3. Constant
4. Cannot predict
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Question 24 : Second order harmonic distortion is __________
1. Amount of second harmonics and first harmonics in signal
2. Amount of second harmonics and fourth harmonics in signal
3. Amount of second harmonics present in signal
4. RMS value of all even harmonics in signal
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Question 25 : The ratio of the RMS value of additional frequency components in output to the RMS value of the original output of the amplifier is called __________
1. Intermodulation distortion
2. Total amplitude distortion
3. Total frequency distortion
4. Total harmonic distortion
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Question 26 : Intermodulation distortion is caused by __________
1. Presence of harmonic components in signal
2. Non- linearity of biasing circuit
3. Non-linearity of amplifier
4. High frequency signal
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Question 27 : The ratio of the RMS amplitude of the higher order harmonic frequencies to the RMS amplitude of the fundamental frequency is commonly called __________
1. Total harmonic power
2. Total amplitude distortion
3. Total frequency distortion
4. Total harmonic distortion
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Question 28 : THD is a measure of ____________
1. Amount of harmonic content present in signal
2. Amount of output power
3. Total amount of distortion
4. Total amount of amplitude distortion
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Question 29 : THD+N is a scale used to expressing _______ of an audio amplifier.
1. Gain
2. Sound quality
3. Amplification factor
4. Distortion
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Question 30 : Which of the following components in a transistor circuit is really responsible for harmonic distortion?
1. Capacitor
2. Resistor
3. Transistor
4. Inductance
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