Quiescent Stage in a Transistor

The correct answer is option 'C': No signal is applying to the input.

Explanation:
A transistor is an essential component in electronic devices and circuits, and it operates in different stages depending on the input signals and biases applied to it. One of these stages is the quiescent stage.

1. What is the Quiescent Stage?
The quiescent stage of a transistor refers to a state where no signal is being applied to the input of the transistor. It is also known as the idle state or the off state of the transistor. In this stage, the transistor is not amplifying or switching any signals, and it is in a stable condition.

2. Understanding the Options:
a) Emitter junction bias is just equal to collector junction bias:
This option refers to the biasing conditions of the transistor. Biasing is the process of providing the appropriate voltage levels to the transistor terminals for its proper operation. In the quiescent stage, the transistor may or may not have equal biases on the emitter and collector junctions. Therefore, this option is not correct.

b) No current is flowing:
In the quiescent stage, there may or may not be a flow of current through the transistor. It depends on the biasing conditions and the type of transistor used. Hence, this option is not correct.

c) No signals are applying to the input:
This option correctly describes the quiescent stage. In this stage, no input signals are applied to the transistor, which means there are no variations or fluctuations in the input voltage or current. The transistor remains in a steady state without amplifying or modulating any signals.

d) It is unbiased:
Biasing is an important aspect of transistor operation. In the quiescent stage, the transistor may or may not be unbiased. Biasing depends on the desired operating point of the transistor and the circuit requirements. Therefore, this option is not correct.

3. Conclusion:
The correct answer is option 'C': No signal is applying to the input. In the quiescent stage, the transistor remains in a stable state without any input signals being applied. It is important to note that the other options mentioned may or may not be applicable to the quiescent stage, depending on the specific circuit and transistor characteristics.