BJT and FET Frequency Response – Exercise – 1

16. A change in frequency by a factor of ________ is equivalent to 1 decade.

(a) 2
(b) 10
(c) 5
(d) 20

Answer
Answer : (b)
Explanation
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17. Determine the break frequency for this circuit.

(a) 15.915 Hz
(b) 159.15 Hz
(c) 31.85 Hz
(d) 318.5 Hz

Answer
Answer : (b)
Explanation
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18. In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage for frequencies much larger than the cutoff frequency in the low-frequency region?

(a) About 0º
(b) 45º
(c) About 90º
(d) None of the above

Answer
Answer : (a)
Explanation
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19. In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage at the cutoff frequency in the low-frequency region?

(a) About 0º
(b) 45º
(c) About 90º
(d) None of the above

Answer
Answer : (b)
Explanation
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20. An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input power required for full power output if the power gain is 20 dB.

(a) 3 mW
(b) 30 mW
(c) 300 mW
(d) 3 W

Answer
Answer : (c)
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