A designer requires a shunt regulator of approximately 20 V. Two kinds of Zener diodes are available: 6.8-V devices with rz of 10 Ω and 5.1-V devices with rz of 30 Ω. For the two major choices possible, find the load regulation. In this calculation neglect the effect of the regulator resistance R.

-30mV/mA and 120mV/mA respectively

30mV/mA and 60mV/mA respectively

-60mV/mA and +60mV/mA respectively

-30mV/mA and -120mV/mA respectively

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

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1.	Partial specifications of a Zener diode is provided. VZ = 10.0 V, VZK = 9.6 V, and IZT = 50 mA. Assuming that the power rating of a breakdown diode is established at about twice the specified Zener current (IZT), what is the power rating of each of the diodes described above?
A.	1.04 W
B.	0.104 W
C.	10.4 mW
D.	1.04 mW
Answer» B. 0.104 W

Discussion

2.	A designer requires a shunt regulator of approximately 20 V. Two kinds of Zener diodes are available: 6.8-V devices with rz of 10 Ω and 5.1-V devices with rz of 30 Ω. For the two major choices possible, find the load regulation. In this calculation neglect the effect of the regulator resistance R.
A.	-30mV/mA and 120mV/mA respectively
B.	30mV/mA and 60mV/mA respectively
C.	-60mV/mA and +60mV/mA respectively
D.	-30mV/mA and -120mV/mA respectively
Answer» E.

Discussion

3.	A shunt regulator utilizing a zener diode with an incremental resistance of 5 Ω is fed through an 82-Ω resistor. If the raw supply changes by 1.0 V, what is the corresponding change in the regulated output voltage?
A.	72.7 mV
B.	73.7 mV
C.	74.7 mV
D.	75.7 mV
Answer» D. 75.7 mV

Discussion

4.	A 9.1-V zener diode exhibits its nominal voltage at a test current of 28 mA. At this current the incremental resistance is specified as 5 Ω. Find VZ0 of the Zener model.
A.	8.96V
B.	9.03V
C.	9.17V
D.	9.24V
Answer» C. 9.17V

Discussion

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

Partial specifications of a Zener diode is provided. VZ = 10.0 V, VZK = 9.6 V, and IZT = 50 mA. Assuming that the power rating of a breakdown diode is established at about twice the specified Zener current (IZT), what is the power rating of each of the diodes described above?

A shunt regulator utilizing a zener diode with an incremental resistance of 5 Ω is fed through an 82-Ω resistor. If the raw supply changes by 1.0 V, what is the corresponding change in the regulated output voltage?

A 9.1-V zener diode exhibits its nominal voltage at a test current of 28 mA. At this current the incremental resistance is specified as 5 Ω. Find VZ0 of the Zener model.