Question

When a signal is applied to the input of a transistor it was found that output signal is phase-shifted by 180\(^\circ\). The transistor configuration is

• A. CB - configuration
• B. CE - configuration
• C. CC - configuration
• D. Both CB and CC - configuration

Hint:

In transistor amplifiers, the common emitter configuration provides a 180\(^\circ\) phase shift between input and output.

Answer 1

The Correct Option is B

Step 1: In the CE configuration, the output is 180\(^\circ\) out of phase with the input, which is a characteristic feature of the common emitter configuration. 

Step 2: In both CB and CC configurations, the phase shift is either zero or a fraction of a degree, not 180\(^\circ\). Hence, the only correct answer is the CE configuration. Thus, the correct answer is option (2), CE - configuration.