A low noise preamplifier has a 1 dB compression point of 100 mV RMS. This means

Question

A low noise preamplifier has a 1 dB compression point of 100 mV RMS. This means that :

1. the noise floor of the amplifier is 100 mV RMS
2. the dynamic range of the amplifier is 20 dB
3. the amplifier will begin to act in a non-linear fashion at levels above 100 mV RMS
4. None of these

An RC low pass filter uses a 1000 Ohm resistor and a 0.01 microfarad capacitor. It's cutoff frequency will be :

1. 1.59 kHz
2. 159 Hz
3. 100 kHz
4. 15.9 kHz
5. None of these


Power factor correction is important in AC power systems because :

1. High power factors lead to increased line losses and higher utility charges
2. Low power factors lead to increased line losses and higher utility charges
3. Operating a load with a low power factor increases overall system efficiency
4. None of the above are true

Explanation / Answer

the amplifier will begin to act in a non-linear fashion at levels above 100 mV RMS

1 / 2 *pi * R * C = 1/2*pi*100 * 0.01 * 10^-6 = 10^6 / 2pi = 1.59 KHz

Low power factors lead to increased line losses and higher utility charges

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