When a transistor amplifier having current gain of 75 is given an input signal voltage Vi=2 sin157t+π2mV .If input  resistance is Ri=500Ω and resistance in the collector circuit is  2000Ω, The output signal voltage is

Since the current gain is β = 75 , Voltage gain Av=2000500 x 75=300∴The transistor must be a common emitter amplifier. Peak value of output voltage = 300 x 2 x 10-3v=0.6VIn common emitter configuration, The phase difference between output and input signal voltage is 180o∴V0=600 sin(157t+π2+π) mV