Zener Diode Mcq With Answers

November 08, 2024 Post a Comment

Zener diode mcq with answers

Explanation: A Zener diode is used as a voltage regulator in reverse biased mode. The breakdown voltage in the Zener diode when connected in the reverse-biased is called Zener voltage.

How do you solve a Zener diode question?

Divided. By RL. And in this problem VZ VZ is equal to 20 volts. So we have 20 inside the bracket r

What is avalanche breakdown in Zener diode Mcq?

Zener Breakdown	Avalanche Breakdown
As temperature increases the breakdown voltage decreases.	As temperature increases, the breakdown voltage also increases.
The low reverse potential is sufficient for breakdown.	A high reverse potential is required for breakdown.

What is Zener diode also known as?

Voltage regulator diodes actively use this characteristic. Since this breakdown voltage is also called Zener voltage, voltage regulator diodes are also called Zener diodes. This voltage may be used as a constant voltage power supply or a reference voltage for electronic circuits.

What is Zener formula?

The maximum current is calculated by dividing the power rating by the Zener voltage: I=P/V = 3W/12V = 0.25A.

Why is Zener used?

Zener diode is used as a Shunt voltage regulator for regulating voltage across small loads. The Zener diode is connected parallel to the load to make it reverse bias, and once the Zener diode exceeds knee voltage, the voltage across the load will become constant.

What is Zener knee current?

In the circuit shown below, the knee current of the ideal zener diode is 10 mA.

What is the current in Zener diode?

As 6 V appears across the Zener diode as it is in the breakdown region, so Zener diode will act as a constant source of 6 V. I = (13 - 6) × 10-3 = 7 mA.

How does a Zener diode limit voltage?

Zener Diodes can be used to produce a stabilised voltage output with low ripple under varying load current conditions. By passing a small current through the diode from a voltage source, via a suitable current limiting resistor (RS), the zener diode will conduct sufficient current to maintain a voltage drop of Vout.

What is Zener diode symbol?

In zener diode, electric current flows from both anode to cathode and cathode to anode. The symbol of zener diode is similar to the normal p-n junction diode, but with bend edges on the vertical bar.

What is Zener breakdown region?

Parameters	Zener breakdown
Definition	It occurs in the Zener diodes having Vz between 5 to 8 volts or less than 5V.
Depletion region	The depletion region is thin
Electric connection	The connection is not destroyed
Electric field	The electric field is strong

What are the two types of breakdown in Zener diode?

A zener diode has two distinctly different breakdown mechanisms: zener breakdown and avalanche breakdown. The zener breakdown voltage decreases as the temperature increases, creating a negative temperature coefficient (TC). The avalanche breakdown voltage increases with temperature (positive TC) (Pryce, 1990).

Where is Zener used?

Zener diodes are used for voltage regulation, as reference elements, surge suppressors, and in switching applications and clipper circuits. The load voltage equals breakdown voltage VZ of the diode. The series resistor limits the current through the diode and drops the excess voltage when the diode is conducting.

What is Zener diode made of?

The true Zener diodes, which have the same properties as avalanche diodes and are used in the same applications, rely on the Zener effect. The diode is made from heavily doped silicon, so that the depletion layer is very thin.

In which region is Zener diode used?

The Zener diode will be operated in the reverse breakdown region so that the voltage will remain constant. Therefore option 3 is correct. In that region, the voltage will be equal to the breakdown voltage and this will make the Zener diode work as a voltage regulator.

What is the maximum Zener power?

Power rating: The maximum power the Zener diode can dissipate; given by the product of voltage across the diode and the current flowing through. Typical values are 400 mW, 500 mW, 1 W, and 5 W; for surface mounted, 200 mW, 350 mW, 500 mW, and 1 W are typical. Voltage tolerance: typically ±5%. 2.

Why is PN junction used?

P-N junction diode can be used as a photodiode as the diode is sensitive to the light when the configuration of the diode is reverse-biased. It can be used as a solar cell. When the diode is forward-biased, it can be used in LED lighting applications.

What is breakdown voltage?

Breakdown voltage is the threshold voltage at which the initiation of breakdown occurs. However, before current can flow, the open gap voltage increases until it has created an ionization path through the dielectric. Once the current starts to flow, voltage drops and stabilizes at the working gap level.

Why Zener diode is named so?

A Zener diode is a type of diode that permits current to flow in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the rated breakdown voltage or "Zener voltage". The device was named for Clarence Zener, who discovered this electrical property.

What is Zener power?

The power rating of a Zener diode indicates the maximum power that the diode can safely dissipate. In the formula below, power equals the voltage multiplied by the current. IZM is the maximum current that can flow through the diode, and PZM is the diode's maximum power dissipation, and VZ is the Zener voltage.