第九章测试1.
Calculate the low frequency break point due to the capacitor 
for this BJT amplifier. （ ）
A:
B:
C:
D:
答案:A
2.
If several identical stages of amplifiers, each having the exact same upper and lower cutoff frequencies, are connected in cascade, then the bandwidth of the resulting amplifier will （ ）.
A:decrease B:be equal to the sum of all the individual bandwidths C:increase D:remain unchanged 3.
A 3-dB drop in β occurs at （ ）.
A:
B:
C:
D:
4.Negative dB values represent （ ）.
A:power losses B:power values that do not change C:power gain 5.
An amplifier has a midband power gain of 24,500. What is the value of the power gain in dB for the circuit? （ ）
A:43.9 dB B:87.78 dB C:4.39 dB
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