Question 1 : If an electronic system produces a 48mV output voltage when a 12mV signal is applied, calculate the decibel value of the systems output voltage gain.
1. 12dB
2. 6dB
3. 20dB
4. 4dB
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Question 2 : If the output power from an audio amplifier is measured at 100W when the signal frequency is 1kHz, and 1W when the signal frequency is 10kHz. Calculate the dB change in power.
1. -10dB
2. -20dB
3. -30dB
4. 15dB
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Question 3 : Voltage gain of 1,00,000 is equivalent to __________
1. 10dB
2. 1000dB
3. 100dB
4. 50dB
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Question 4 : -6dB is equivalent to __________ power gain.
1. 0.5
2. 0.25
3. 0.75
4. 0.8
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Question 5 : What is the roll-off rate of single order filter?
1. 20dB/decade
2. 5dB/octave
3. 40dB/decade
4. 10dB/octave
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Question 6 : A voltage amplifier has a voltage gain of 100. What will be gain at 3dB cut-off frequencies?
1. 70.7
2. 80.7
3. 45.7
4. 50
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Question 7 : At 3dB cut-off frequencies power will be __________
1. Half of maximum value
2. Quarter of maximum value
3. 70.7% of maximum value
4. Same as maximum value
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Question 8 : At 3dB cut-off frequency the voltage gain will be __________
1. 100% of maximum gain
2. 70.7% of maximum gain
3. 80.7% of maximum gain
4. 47.5% of maximum gain
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Question 9 : Bandwidth of amplifier is __________
1. Difference between upper cut-off frequency and lower cut-off frequency
2. Sum of upper cut-off frequency and lower cut-off frequency
3. Average of upper cut-off frequency and lower cut-off frequency
4. Independent to cut off frequency
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Question 10 : Which of the following is the best biasing method for transistor bias?
1. emitter bias
2. voltage divider bias
3. fixed bias
4. collector feedback bias
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