Explore topic-wise MCQs in Electronic Devices Circuits.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices Circuits knowledge and support exam preparation. Choose a topic below to get started.

1.

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
Answer» E.
Discussion
2.

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)
Answer» C. β=α/(1+α)
Discussion
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
Answer» D. 4.5mA
Discussion
4.

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
Answer» C. 3.64mA and 33µA
Discussion
5.

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
Answer» D. 0.05mA
Discussion
6.

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
Answer» E.
Discussion
7.

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
Answer» E.
Discussion
8.

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
Answer» B. 2.945mA and 55¬¨¬®¬¨¬µA
Discussion
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)
Answer» C. ‚âà√≠‚Äö√¢¬ß=‚âà√≠¬¨¬±/(1+‚âà√≠¬¨¬±)
Discussion
10.

The negative sign in the formula of amplification factor indicates_________

A. that I<sub>E</sub> flows into transistor while I<sub>C</sub> flows out it
B. that I<sub>C</sub> flows into transistor while I<sub>E</sub> flows out it
C. that I<sub>B</sub> flows into transistor while I<sub>C</sub> flows out it
D. that I<sub>C</sub> flows into transistor while I<sub>B</sub> flows out it
Answer» B. that I<sub>C</sub> flows into transistor while I<sub>E</sub> flows out it
Discussion
11.

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
Answer» D. 4.5mA
Discussion
12.

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
Answer» C. 3.64mA and 33¬¨¬®¬¨¬µA
Discussion
13.

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
Answer» D. 0.05mA
Discussion
14.

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
Answer» C. 0.543
Discussion
15.

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
Answer» E.
Discussion
16.

The AC current gain in a common base configuration is_________

A. -∆I<sub>C</sub>/∆I<sub>E</sub>
B. ∆I<sub>C</sub>/∆I<sub>E</sub>
C. ∆I<sub>E</sub>/∆I<sub>C</sub>
D. -∆I<sub>E</sub>/∆I<sub>C</sub>
Answer» B. ‚Äö√Ñ√∂‚àö‚Ć‚àö√∫I<sub>C</sub>/‚Äö√Ñ√∂‚àö‚Ć‚àö√∫I<sub>E</sub>
Discussion