Question

1. If the voltage gain is 2000, the decibel voltage gain is a. 40 dB c. 66 dB b. 46 dB d. 86 dB 2. The input power to a device is 10.000 W. The output power is 500 W. The power gain (GdB) in decibels is a. -13 dB b. -26 dB c. 56 dB d. 18 dB 3. Which of the following is an advantage of using dB representations of gain values? (a) Positive and negative dB values represent gain and loss values that are reciprocals of each other. (b) In multistage amplifiers, gain calculations are simplified by the use of dB values. (c) Using dB values, we can represent large gain values with relatively small numbers. (d) All of the above. 4. The high-frequency response of a BJT amplifier is affected by: (a) The BJT internal capacitances (b) The supply voltage (c) The cupling and bypass capacitor values (d) All of the above 5. The BJT gain-bandwidth product (ft) is (a) Inversely related to re (b) Inversely related to (Che + Cbc) (c) Not related to dc bias conditions (d) All of the above 6. A common-emitter amplifier uses a transistor that has a beta of 50, re = 10 ohms, Che = 30 pf, Che = 3.5 pf, Cce =lpf, Cw=5pf. The Value of fBeta is: (a) 19.04 M Hz (b) 1.95 MHz (c) 9.502 MHz (d) None of the above

Answer 1

1. Voltage gain is equal to 2000. Converting actual gain value in decibels.

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Option C is correct.

2. Input power=10000W

Output power=500W

Power gain in decibels is given by

Option a is correct.

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