Operating Point MCQ Quiz - Objective Question with Answer for Operating Point - Download Free PDF
Last updated on Jun 12, 2025
Latest Operating Point MCQ Objective Questions
Operating Point Question 1:
If a transistor operates at the middle of the dc load line, an increase in the current gain will move the Q point
Answer (Detailed Solution Below)
Operating Point Question 1 Detailed Solution
The correct answer is: 3) Up on the load line
Explanation:
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The Q-point (Quiescent point) is the operating point of a transistor on the DC load line, typically chosen in the middle for maximum undistorted output swing.
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The DC load line is a straight line that shows all possible combinations of collector current (IC) and collector-emitter voltage (VCE) for a given load resistor and supply voltage.
When current gain (β) increases:
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The base current (IB) remains constant (if the base biasing is fixed).
-
But since IC = β × IB, a higher β leads to higher collector current (IC).
-
As IC increases, the collector-emitter voltage (VCE) drops (Ohm's law: VCE = VCC - IC×RC).
This moves the Q-point up on the load line (higher IC, lower VCE).
Top Operating Point MCQ Objective Questions
Operating Point Question 2:
If a transistor operates at the middle of the dc load line, an increase in the current gain will move the Q point
Answer (Detailed Solution Below)
Operating Point Question 2 Detailed Solution
The correct answer is: 3) Up on the load line
Explanation:
-
The Q-point (Quiescent point) is the operating point of a transistor on the DC load line, typically chosen in the middle for maximum undistorted output swing.
-
The DC load line is a straight line that shows all possible combinations of collector current (IC) and collector-emitter voltage (VCE) for a given load resistor and supply voltage.
When current gain (β) increases:
-
The base current (IB) remains constant (if the base biasing is fixed).
-
But since IC = β × IB, a higher β leads to higher collector current (IC).
-
As IC increases, the collector-emitter voltage (VCE) drops (Ohm's law: VCE = VCC - IC×RC).
This moves the Q-point up on the load line (higher IC, lower VCE).