A) \[75\,\cos \left( 15t+\frac{2\pi }{3} \right)\]
B) \[2\,\cos \left( 15t+\frac{5\pi }{6} \right)\]
C) \[300\,\cos \left( 15t+\frac{4\pi }{3} \right)\]
D) \[300\,\cos \left( 15t+\frac{\pi }{3} \right)\]
Correct Answer: C
Solution :
| Given: Voltage gain \[{{A}_{V}}=150\] |
| \[{{V}_{i}}=2\cos \left( 15t\frac{\pi }{3} \right);\,\,{{V}_{0}}=?\] |
| For CE transistor phase difference between input and output signal is \[\pi =180{}^\circ \] |
| Using formula, \[{{A}_{V}}=\frac{{{V}_{0}}}{{{V}_{1}}}\] |
| \[\Rightarrow \,\,{{V}_{0}}={{A}_{V}}\times {{V}_{i}}\] |
| \[=150\times 2\cos \left( 15t+\frac{\pi }{3} \right)\] |
| or \[{{V}_{0}}=300\cos \left( 15t+\frac{\pi }{3}+\pi \right)\] |
| \[{{V}_{0}}=300\cos \left( 15t+\frac{4}{3}\pi \right)\] |
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