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Yes dynamic impedance of zener diode vary.
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Description :

Answer : Yes, Zener diode is a voltage regulator. Zener diode maintain constant reverse Biased Voltage. If the current is varying then also zener diode maintain constant voltage.

Description : Can we use a zener diode as a rectifier?

Answer : Yes we can use zener diode as rectifier but it have limitations better to use normal diode. Zener diode have some different applications.

Description :

Answer : PN junction of zener diode is heavily doped than ordinary diode. For the occurrence of Zener effect the zener diode is heavily doped. If the zener diode is not heavily doped then Zener effect ... breakdown voltage is sharp. If the diode is lightly doped the diode will have higher breakdown voltage.

Description :

Answer : Yes it can be, and it will act like a normal PN junction diode. The characteristic of ZENER diode is exactly same as PN junction diode in forward Bias.

Description : Draw symbols of zener diode and LED.

Answer : Symbol of zener diode : Symbol of LED

Description :

While studying the V-I characteristics of a zener diode, there are two different values of resistors connected in series with it. In case of the forward characteristics, a ~70 ohm resistor is connected whereas in case of reverse characteristics, a fairly large ~510 ohm resistor. What is the reason behind it ? Is the difference really necessary ?image

Description : State any two applications of zener diode.

Answer : Applications of Zener Diode: i) As a voltage regulator. ii) As a fixed reference voltage provider in transistor biasing circuits. iii) As peak clippers or limiters in wave shaping circuits.

Description : List specification of zener diode

Answer : 1. Zener Voltage 2. Maximum Zener current 3. Power dissipation 4. Operating temperature 5. Dynamic Resistance 

Description : A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω  

Answer : A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω  

Description :

How can you identify a zener diode?

Answer : It  conducts  current  in  either  direction.

Description : Do Zener diodes have polarity?

Answer : Yes, Zener diode have polarity Anode(+) and Cathode (-). And Zener Diode are connected into circuit with their cathode as positive terminal because they operate in reverse bias mode.

Description : What does a Shockley diode do?

Answer : It is diode have low forward voltage drop and very high switching action

Description :

Answer : It is semiconductor diode with a low forward voltage drop and very high switching action

Description : Explain zener breakdown and avalanche breakdown.

Answer : The Zener Breakdown and Avalanche Breakdown are two different mechanisms by which a PN junction breaks. The Zener and Avalanche breakdown both occur in diode under reverse bias. The avalanche breakdown ... in the PN junction and causes breakdown. The process is known as the Avalanche breakdown.

Description : Write the function of freewheeling diode.

Answer : Function of Freewheeling Diode (FWD): a) Freewheeling diode is used across inductive loads such as coils, dc motor armature etc. to prevent voltage spikes across these loads when the switching ... current is shifted from switching device, it is turned off easily and regain its blocking ability.

Description : Explain the formation of parasitic BJT and parasitic diode in Power MOSFET. Can parasitic diode be used in same power electronics applications?

Answer : Parasitic Diode: The parasitic diode is in between drain and source. The MOSFET structure itself contains parasitic diode or body drain diode. This parasitic diode allows the reverse flow of current when the ... of MOSFET as a BJT collector. Parasitic BJT operates in the cut-off region.

Description : Justify the statement. Antiparallel diode is connected across MOSFET.

Answer : In MOSFET current is flow from drain to source but when the load is inductive the current may flow in opposite direction. To avoid the opposite flow of current and to protect MOSFET the antiparallel diode is connected across MOSFET.

Description : What would cause a diode to fail?

Answer : Supply voltage beyond its limit

Description : What is the use of Schottky diode?

Answer : Schottky diode are use in SMPS, Sample and hold circuits and voltage clamping etc.

Description : What is the use of laser diode?

Answer : laser diodes are use in telecommunication, rangefinders, barcode readers etc.

Description : What is the use of fast recovery diode?

Answer : Fast recovery diode are used in high frequency rectification. Fast recovery diode also used for freewheeling. Fast recovery diode also used for DC to DC converter.

Description : What is the use of Tunnel diode ?

Answer : Tunnel diode is use in frequency converters and detectors, ultra high speed switching, amplifiers, etc.

Description : Suggest the diode material suitable to rectify 0.5V AC signal.

Answer : The diode material suitable to rectify 0.5V AC signal is silicon

Description :

Diode


Description : Diode VI characteristics

Answer : Diode VI characteristics

Description : applications of Schottky diode.

Answer : 1) To rectify very high frequency signals. 2) As a switching device in digital computers. 3) In clipping & and clamping circuits. 4) In low power schottky TTL circuits. 5) In mixing and detecting circuits used in communication systems. 6) In low voltage power supply circuits.

Description :  applications of P-N junction diode

Answer : 1.It is used as rectifier in DC power supply 2.It is used as free wheel diode across relay or inductive load 3.It is used as switch in logic circuits used in computers 4.It is used as detector in demodulation circuits of communication receiver 

Description : Avalanche diode

Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Description : Define ripple factor and PIV of diode.

Answer : 1. Ripple factor: It is define as ratio of R.M.S. value of AC component to the DC component in the output.  2. PIV : It is maximum reverse voltage that diode can withstand without destroying junction.

Description : Explain the operating principle of LASER and list applications of LASER diode.

Answer : A basic construction of Laser diode is as shown . A PN junction is formed by two layers of doped gallium arsenide. There is highly reflective surface at one end of PN junction and ... 6. laser scanning and light beam illumination. 7. Military applications 8. Medical surgery 9.Diamond cutting

Description : A diode in which the change in reverse bias voltage varies the capacitance is called as A) Varactor diode B) Switching diode C) Tunnel diode D) Zener-diode  

Answer : A diode in which the change in reverse bias voltage varies the capacitance is called as Varactor diode

Description : Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode

Answer : Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode

Description : What is a diode clamper circuit?

Answer : Tha faction of diode 

Description :

What is the use of diode in the circuit?

Answer : Diode is a device which allows the flow of current in one direction and blocks the current in opposite direction.

Description : Which side of the diode is positive?

Description : How do we test a diode?

Description :

Write short notes on diode.

Answer : Diode is made from semiconductor material like silicon or germanium. Diode may use as rectifier which convert AC to DC. It is a electronic component. It is two terminal device, one is anode and second is ... in one direction. Diode is made from P-type and N-type material. Diode have a PN junction.

Description : what is the minimum voltage required to turn on a diode ?

Answer : 0.7 v sil and 0.3 v for gr

Description : How much time a diode takes to switch ON in forward bias condition.

Answer : t=0 sec.

Description : what is diode ?

Answer : Semiconductor device. That allows flow of current in one direction

Description :

Answer : In Reverse bias of diode when the cathode is connected to positive and anode is connected to negative very small current flows this very small current is known as leakage current of diode.

Description :

Answer : Diode conducts when the anode voltage is greater than the cathode voltage.

Description :

Answer : Diode have two terminals.

Description : Which device use to convert DC to AC?

Answer : Rectifier

Description : Explain Zener diode as voltage regulator. 

Answer : 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 ... across the load in spite of variations in the input voltage or changes in the load current. 

Description : List four specifications of zener diode or P- N junction diode.

Answer : Specifications of zener diode: 1. Zener voltage 2. Power dissipation 3. Maximum power dissipation PD(max) 4. Breakdown current 5. Dynamic resistance 6. Maximum reverse current. (OR) ... Reverse saturation current 5. Power dissipation 6. Junction temperature 7. Peak inverse voltage (PIV)

Description : Write two applications of P-N junction diode and zener diode. 

Answer : Application of P-N junction diode: Used in rectifier circuit Used in clipping and clamping circuit. Used for A.M detection Used for voltage multiplier. Application of Zener diode: It is ... . Used in protection circuits for MOSFET. Used in pulse amplifier. Used in clipping circuits.

Description : Draw symbol and state one application of zener diode and LED.

Answer : Diagram: Application of Zener diode:  It is used as voltage regulator. Used in protection circuits for MOSFET. Used in pulse amplifier. Used in clipping circuits. ... alarm systems 7-segment, 16- segment and dot matrix displays Indicating power ON/OFF conditions

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