Amplifiers

The signal fed into an amplifier is 0.1 volts and the output signal is 15 volts. What is the proper way of expressing the voltage gain of this amplifier?

• 14.9 Volts

• 150 Volts

• 150

• 150 Watts

What is the output signal from an amplifier with a voltage gain of 25 and an input signal of 85 mV?

• 2.13 V

• 3.67 V

• 4.35 V

• 8.52 V

The response of human hearing for loudness is

• linear

• exponential

• parabolic (square-law)

• logarithmic

What is the ratio power gain of an amplifier that produces 150 watts of output for 1 watt of input?

• 149 watts

• 149

• 150 watts

• 150

Common logarithms are powers (exponents) of

• one

• two

• eight

• ten

What is the decibel power gain of an amplifier that produces 150 watts of output for 1 watt of input?

• 2.18 dB

• 20.0 dB

• 21.8 dB

• 35.5 dB

A three stage system has a first stage gain of 6 dB, a second stage gain of 8 dB, and a third stage gain of 10 dB. What is the dB gain of the entire system?

• 24 dB

• 58 dB

• 80 dB

• 480 dB

A three stage system has a first stage gain of 6 dB, a second stage gain of 8 dB, and a third stage gain of 10 dB. What is the ratio gain of the entire system?

• 15

• 251

• 519

• 800

A three stage system has ratio power gains of 80 in the first stage, 17 in the second stage, and 40 in the third stage. What is the dB system gain?

• 47.4

• 94.7

• 10,000

• 54,400

A three stage system has ratio voltage gains of 80 in the first stage, 17 in the second stage, and 40 in the third stage. Assuming equal input and output resistance, what is the dB system gain?

• 47.4

• 94.7

• 10,000

• 54,400