What is the operating point of a transistor as an amplifier known as?

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RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 2)

Answer 1

Load line in CE amplifier

When no signal is applied, the transistor voltage and current conditions are as indicated at the quiescent point (Q point) on the dc load line.
When an ac signal is applied, the transistor voltage and current vary above and below point Q.
The load line is drawn between collector current I_C and collector voltage V_CE for different values of base current I_B.
When a value for the maximum possible collector current is considered, that point will be present on the Y-axis, which is nothing but the saturation point.
When a value for the maximum possible collector-emitter voltage is considered, that point will be present on the X-axis, which is the cutoff point.
When a line is drawn joining these two points, such a line can be called a Load line.
This line, when drawn over the output characteristic curve, makes contact at a point called an Operating point or quiescent point, or Q-point.