1. THD+N is a scale used to expressing _______ of an audio amplifier

a) Gain

b) Sound quality

c) Amplification factor

d) Distortion

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2. THD is a measure of

a) Amount of harmonic content present in signal

b) Amount of output power

c) Total amount of distortion

d) Total amount of amplitude distortion

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3. The ratio of the RMS amplitude of the higher order harmonic frequencies to the RMS amplitude of the fundamental frequency is commonly called

a) Total harmonic power

b) Total amplitude distortion

c) Total frequency distortion

d) Total harmonic distortion

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4. Intermodulation distortion is caused by

a) Presence of harmonic components in signal

b) Non- linearity of biasing circuit

c) Non-linearity of amplifier

d) High frequency signal

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5. The ratio of the RMS value of additional frequency components in output to the RMS value of the original output of amplifier is called as

a) Intermodulation distortion

b) Total amplitude distortion

c) Total frequency distortion

d) Total harmonic distortion

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6. Second order harmonic distortion is

a) Amount of second harmonics and first harmonics in signal

b) Amount of second harmonics and fourth harmonics in signal

c) Amount of second harmonics present in signal

d) RMS value of all even harmonics in signal

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7. Power delivered to load is _________ with increase in harmonic distortion.

a) Increases

b) Decreases

c) Constant

d) Cannot predict

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_{ac})D = P

_{ac}(1+D

^{2}). It is clear that output power increases with distortion.

8. In three-point method the harmonics which are considered for calculating distortion is

a) First harmonics only

b) First and Second harmonics only

c) First, Second and Third harmonics only

d) Second and Third harmonics only

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9. If D1, D2, D3, D4 are the distortion produced by second, third, fourth, fifth respectively (others are insignificant). Then total harmonic distortion is

a) √(D1^{2}+D2^{2}+D3^{2}+D4^{2})

b) √(D1^{2}+D3^{2})

c) √(D2^{2}+D4^{2})

d) √(D1^{2}+D2^{2})

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10. Power delivered to load calculated by five-point method can be equal to

(P_{ac} is power delivered to load without distortion and D is the RMS of all Harmonic distortion)

a) P_{ac} (1-D2)

b) P_{ac} /D2

c) P_{ac} (1+D2)

d) P_{ac} D2