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WorksheetsMCQs on BJT Biasing Circuits - I
Total questions: 10
Worksheet time: 5mins
What is the Q-point in a transistor biasing circuit?
The maximum voltage across collector-emitter terminals
The minimum base current required for conduction
The fixed point representing the DC operating condition
The cutoff threshold of a transistor
For a BJT to operate in the active region, which of the following is true?
Both junctions are reverse biased
Base-emitter is forward biased and base-collector is reverse biased
Both junctions are forward biased
Base-collector is forward biased and base-emitter is reverse biased
In a fixed bias configuration, how is the base current I_B calculated?
I_B = (V_CC - V_BE)/R_C
I_B = V_CE / R_B
I_B = (V_CC - V_BE)/R_B
I_B = V_BE / R_B
What is the main drawback of a fixed bias circuit?
Low gain
Poor thermal stability
Complexity in design
High input resistance
In fixed bias with emitter resistor, why is R_E added?
To increase input impedance
To improve voltage gain
To improve thermal stability
To increase base current
What happens to the load line when R_C increases in a fixed bias circuit?
It remains unchanged
It becomes steeper
It becomes flatter
It shifts upward
What is the base current equation in a fixed bias with emitter resistor circuit?
I_B = (V_CC - V_BE)/(R_B + R_E)
I_B = (V_CC - V_BE)/(R_B + (1 + β) R_E)
I_B = V_BE / R_B
I_B = V_CC / R_B
Which region of operation is characterized by both junctions being forward biased?
Cut-off
Active
Reverse-active
Saturation
The collector current in fixed bias is related to base current by which expression?
I_C = α I_E
I_C = I_B / β
I_C = β I_B
I_C = β² I_B
What is the typical forward voltage drop of a silicon BJT base-emitter junction?
1.2 V
0.3 V
0.6 to 0.7 V
2 V
