Explore topic-wise MCQs in Electronic Devices and Circuits Questions and Answers.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

A transistor series regulator has the following specifications: VIN=15V, VZ=8.3V, β=100, R=1.8KΩ, RL=2KΩ. What will be the Zener current in the regulator circuit?

A. 4.56mA
B. 3.26mA
C. 4.56mA
D. 3.68mA
Answer» E.
Discussion
2.

A Zener regulator has to handle supply voltage variation from 19.5V to 22.5V. Find the magnitude of regulating resistance, if the load resistance is 6KΩ. The Zener diode has the following specifications: breakdown voltage =18V, (IZ)Min=2µA, maximum power dissipation=60mW and Zener resistance =20Ω.

A. 0 < R < 500Ω
B. 77.8 < R < 500Ω
C. 77.8 < R < 100Ω
D. 18 < R < 500Ω
Answer» C. 77.8 < R < 100Ω
Discussion
3.

Determine the minimum value of load resistance that can be used in the circuit with (IZ)Min=3mA. The input voltage is 10V and the resistance R is 500Ω. The Zener diode has a VZ=6V 0and (IZ)MAX=90mA.

A. 1KΩ
B. 2.4KΩ
C. 1.2KΩ
D. 3.6KΩ
Answer» D. 3.6KΩ
Discussion
4.

Determine the maximum and minimum values of load current for which the Zener diode shunt regulator will maintain regulation when VIN=24V and R=500Ω. The Zener diode has a VZ=12V and (IZ)MAX=90mA.

A. 40mA, 0mA respectively
B. 36mA, 5mA respectively
C. 10mA, 6mA respectively
D. 21mA, 0mA respectively
Answer» E.
Discussion
5.

In the given limiter circuit, an input voltage Vi=10sin100πt is applied. Assume that the diode drop is 0.7V when it’s forward biased. The zener breakdown voltage is 6.8V.The maximum and minimum values of outputs voltage are _______

A. 6.1V,-0.7V
B. 0.7V,-7.5V
C. 7.5V,-0.7V
D. 7.5V,-7.5V
Answer» D. 7.5V,-7.5V
Discussion
6.

The percentage voltage regulation (VL) is given by_________

A. (VNL-VL)/VNL*100
B. (VNL+VL)/VNL*100
C. (VNL-VL)/VL*100
D. (VNL+VL)/VL*100
Answer» B. (VNL+VL)/VNL*100
Discussion