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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 : Explain with circuit diagram operation of zener diode as a voltage regulator.

Answer : The function of a regulator is to provide a constant output voltage to a load connected in parallel with it in spite of the ripples in the supply voltage or the variation in the load ... V0 = VZ is obtained across RL, whenever the input voltage remains within a minimum and maximum voltage.

Description : When biased correctly, a zener diode:

Answer : When biased correctly, a zener diode: Has a constant voltage across it

Description : Which stage is of a d.c. power supply uses zener diode  1. Rectifier 2. Voltage divider 3. Filter 4. Regulator 

Answer : Rectifier

Description : A 6V zener diode is used to provide voltage regulation with a series resistance of 100 Ohms and supply voltage is 12V. When under no load the power dissipated in the zener diode is (a) 60mW (b) 36mW (c) 360mW (d) 3600mW

Description : Zener diode is used in _______. A. Regulated power supplies B. Power generators C. Sensor D. All of these

Answer : Zener diode is used in Regulated power supplies.

Answer : A zener diode works on the principle of Tunneling of charge carriers across the junction.

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

Description : Compare P-N junction and Zener Diode.

Answer : P-N junction Zener Diode It conducts in only in one direction.  It conducts in both the directions. It is always operated in forward bias condition. It is always operated in ... . It cannot be used for rectification, but commonly used for voltage regulation

Description : Draw and describe the VI characteristics of zener diode

Answer : A zener diode is operated only in the reverse-bias region. (generally written as VR) is increased, the reverse current (usually called zener current, IZ) remains negligibly small up to ... out of the breakdown region, when the applied reverse voltage is reduced below the breakdown voltage.  

Description : Which of the following is used for regulated electric supply ? (1) Zener diode (2) Junction diode (3) Gun diode (4) Tunnel diode

Answer : Zener diode

Description : Give the speciality of zener diode. State its 2-3 applications

Answer : Speciality - This diode can keep breakdown voltage constant across it. It is used in reverse bias. Applications - Zener diodes voltage regulation as reference elements surge suppressors switching applications clipper circuits.

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 ... ~510 ohm resistor. What is the reason behind it ? Is the difference really necessary ?

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 : A Zener diode has a break down voltage of 9V and maximum power dissipation of 360 mW. The maximum current the diode can handle is (a) 20 mA (b) 30 mA (c) 35 mA (d) 40 mA

Description : The reverse breakdown phenomenon in a zener diode is known as

Answer : The reverse breakdown phenomenon in a zener diode is known as Avalanche effect

Answer : A Zener diode is operated in the Breakdown Region 

Answer : A Zener diode is operated in the Reverse bias around the knee of breakdown region mode as a voltage stabilizer.

Description : How can you identify a zener diode?

Answer : It  conducts  current  in  either  direction.

Answer : Applications of zener diode are : Zener diode can be use for voltage regulator. Zener diode can be use for clippers or limiters. Zener diode can be use for overvoltage protection. Zener ... reference. Zener diode can be use as transistor regulator. These are some applications of zener diode.

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.

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.

Answer : Yes dynamic impedance of zener diode vary.

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.

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

Answer : 0.7 v sil and 0.3 v for gr

Description : what is diode ?

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

Description : Compare avalanche and zener breakdown.

Answer : Sr. No. Avalanche breakdown Zener breakdown 1 PN junction are lightly doped in avalanche breakdown PN junction are heavily doped in zener breakdown 2 The avalanche breakdown ... 4 Electron hole pairs are generated  Large number of holes and electrons are produced 

Description : Describe avalanche and zener breakdown of PN junction with neat graph.

Answer : Avalanche Breakdown It is observed in diodes having Vz> 8V. is called Avalanche Breakdown It occurs due to accelerating minority carriers. It shows gradual change. Breakdown voltage ... field. Breakdown is very sharp. Breakdown voltage decreases with increase in temperature 

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 : 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 : State applications each of photo-diode and 7-segment display.

Answer : Applications of photo-diode:- 1) In cameras 2) In fiber optic receiver 3) in object counting system  Applications of 7-segmet display 1) In calculators 2) In Wrist watches

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 : Define i)P-N junction diode ii) Depletion layer iii)Forward bias iv)Reverse bias of P-N junction diode

Answer : i)P-N junction diode: It is a semiconductor device in which half of its region is P-type and other half is N-type.  ii) Depletion layer: The region where free electrons and free holes are absent ... and negative terminal is connected to p-side of p-n junction diode, it is said to be reverse bias.

Description : Explain the forward bias characteristics of a P-N Junction diode. 

Answer : forward and reverse characteristics of P-N junction diode.

Description : Plot and explain I -V characteristics of a PN junction diode. 

Answer : V-I characteristics of PN junction diode: Explanation:  Forward Bias:  If the external voltage applied on the silicon diode is less than 0.7 volts, the silicon diode ... reverse breakdown voltage.  * Diode breakdown occurs by two mechanisms: Avalanche breakdown and Zener breakdown.

Description : Name the type of rectifier for each of following feature : (i) Highest rectifier efficiency (ii) Highest form factor (iii) Two diode rectifier circuit (iv) PIV = 2Vm.

Answer : (i) Highest rectifier efficiency : Center tapped & Bridge full wave Rectifier  (ii) Highest form factor : Center tapped & Bridge full wave Rectifier  (iii) Two diode rectifier circuit : Center tapped full wave Rectifier  (iv) PIV = 2Vm : Center tapped full wave Rectifier

Description : State working principle of photo diode. List out its three applications.

Answer : Diagram of photo diode :  Working principle of photo diode :  When photons of energy greater than 1.1 eV hit the diode, electron-hole pairs are created. The ... Smoke detector, Optical communication devices, Position sensors, Bar code scanners, Automotive devices, Surveying instruments

Description :  ‘Germanium diode knee voltage is lower than silicon diode knee voltage.' Justify.

Answer : Justification: The band gap between conduction and valence band for Germanium (0.66eV) is less as compared to Silicon (1.11eV).Hence less energy is required to start conduction in Germanium diode. 

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