Common Base MCQs : This section focuses on the "Common Base". These Multiple Choice Questions (MCQs) should be practiced to improve the Common Base skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A transistor has an IC of 100mA and IB of 0.5mA. What is the value of αdc?
A. 0.787
B. 0.995
C. 0.543
D. 0.659
Question 2
A transistor has an IE of 0.9mA and amplification factor of 0.98. What will be the IC?
A. 0.745mA
B. 0.564mA
C. 0.236mA
D. 0.882mA
Question 3
Determine the value of emitter current and collector current of a transistor having α=0.98 and collector to base leakage current ICBO=4µA. The base current is 50µA.
A. 1.5mA
B. 3.7mA
C. 2.7mA
D. 4.5mA
Question 4
In CB configuration, the value of α=0.98A. A voltage drop of 4.9V is obtained across the resistor of 5KΩ when connected in collector circuit. Find the base current.
A. 0.01mA
B. 0.07mA
C. 0.02mA
D. 0.05mA
Question 5
The AC current gain in a common base configuration is_________
A. -∆IC/∆IE
B. ∆IC/∆IE
C. ∆IE/∆IC
D. -∆IE/∆IC
Question 6
The collector current is 2.945A and α=0.98. The leakage current is 2µA. What is the emitter current and base current?
A. 3mA and 55µA
B. 2.945mA and 55µA
C. 3.64mA and 33µA
D. 5.89mA and 65µA
Question 7
The emitter current IE in a transistor is 3mA. If the leakage current ICBO is 5µA and α=0.98, calculate the collector and base current.
A. 3.64mA and 35µA
B. 2.945mA and 55µA
C. 3.64mA and 33µA
D. 5.89mA and 65µA
Question 8
The negative sign in the formula of amplification factor indicates_________
A. that IE flows into transistor while IC flows out it
B. that IC flows into transistor while IE flows out it
C. that IB flows into transistor while IC flows out it
D. that IC flows into transistor while IB flows out it
Question 9
The relation between α and β is _________
A. β=α/(1-α)
B. α= β/(1+β)
C. β=α/(1+α)
D. α= β/(1- β)
Question 10
The value of αac for all practical purposes, for commercial transistors range from_________
A. 0.5-0.6
B. 0.7-0.77
C. 0.8-0.88
D. 0.9-0.99