Description : In a tunnel diode, electrons can tunnel through the P-N junction mainly because 1.impurity level is low 2.they have high energy 3.barrier potential is very low 4.depletion layer is extremely thin
Last Answer : In a tunnel diode, electrons can tunnel through the P-N junction mainly because depletion layer is extremely thin
Description : Two convicts are locked in a cell. There is an unbarred window high up in the cell. No matter if they stand on the bed or one on top of the other they can't reach the window to escape. They ... too long. Finally one of the convicts figures out how to escape from the cell.What is his plan? -Riddles
Last Answer : His plan is to dig the tunnel and pile up the dirt to climb up to the window to escape.
Description : Two convicts are locked in a cell. There is an unbarred window high up in the cell. No matter if they stand on the bed or one on top of the other they can't reach the window to escape. They ... too long. Finally one of the convicts figures out how to escape from the cell. What is his plan? -Riddles
Description : What limits the usefulness of high-gain, tunnel-diode frequency converters?
Last Answer : Stability problems.
Description : What is the purpose of the circulator in a tunnel-diode amplifier?
Last Answer : Prevent feedback to the tuned input circuit.
Description : Why is the tunnel diode loosely coupled to the cavity in a tunnel-diode oscillator?
Last Answer : To increase the stability.
Description : What determines the frequency of a tunnel-diode oscillator?
Last Answer : The tuned circuit or cavity frequency.
Description : What type of PN diode is formed by using a fine metal wire and a section of N-type semiconductor material?
Last Answer : Point-contact.
Description : In a conductor – (1) there is no conduction band (2) the forbidden energy gap is very wide (3) the forbidden energy gap is very narrow (4) the valence band and the conduction band overlap each other
Last Answer : (4) the valence band and the conduction band overlap each other Explanation: In the case of a conductor, there is no forbidden energy gap. The conduction and valence energy bands overlap ... , the electrons from the valence band can freely enter the conduction energy band. Conduction energy band
Description : In a conductor (1) there is no conduction band (2) the forbidden energy gap is very wide (3) the forbidden energy gap is very narrow (4) the valence band and the conduction band overlap each other
Last Answer : the valence band and the conduction band overlap each other
Description : Define conduction band & forbidden energy gap.
Last Answer : Conduction band :Range of energy possesed by conduction electrons is called conduction band. Forbidden energy gap : The energy difference between conduction band and valance band is called forbidden energy gap.
Last Answer : 0.7 Is the forbidden energy gap of germanium
Description : For silicon the forbidden gap is (A) 1.1ev. (B) 0.25ev. (C) 0.5ev. (D) 0.7ev.
Last Answer : (A) 1.1ev.
Description : For germanium the forbidden gap is (A) 0.15ev. (B) 0.25ev. (C) 0.5ev. (D) 0.7ev.
Last Answer : (D) 0.7ev.
Last Answer : The forbidden gap in an insulator is large.
Description : A combination of N-type and P-type material is called a) Diode b) Transistor c) Resistor d) Capacitor
Last Answer : a) Diode
Description : Insulators have (A) A full valence band. (B) An empty conduction band. (C) A large energy gap. (D) All the above.
Last Answer : (C) A large energy gap.
Description : On increasing the reverse bias to a large value in a p-n junction diode current (a) Increases slowly (b) Remains fixed (c) Suddenly increases (d) Decreases slowly
Last Answer : (c) Suddenly increases
Description : Tunnel diode is a: a) Power diode b) Has light doping c) Has heavy doping d) Is a reverse recovery diode Ans: C 76.LEDs are fabricated from: a) Silicon b) Germanium c) Si or Ge d) Gallium arsenide
Last Answer : Ans: D
Description : Which of the following is used for regulated electric supply? (1) Zener diode (2) Junction diode (3) Gun diode (4) Tunnel diode
Last Answer : (1) Zener diode Explanation: The Zener diode is like a generalpurpose signal diode. When based in the forward direction it behaves just like a normal signal diode, but when a reverse voltage ... property. Many diodes described as "Zener" diodes rely instead on avalanche breakdown as the mechanism.
Description : In the illustration, the component VR2 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to terminal ... 2 at 9.1 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC
Last Answer : Answer: C
Description : In the illustration, the component VR1 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to ... terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC
Last Answer : Answer: A
Description : In the illustration, the component VR1 on the A1A1 PCB is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply B. a variable resistor diode to control the output to terminal 9 that controls ... terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC
Description : Which of the following is used as an optical receiver in fiber optics communications a. APD b. Tunnel diode c. Laser diode d. LED
Last Answer : a. APD
Description : The most common device used as an LNA is A. zener diode B. tunnel diode C. IMPATT D. Shockley diode
Last Answer : B. tunnel diode
Description : Which of the following is used as an optical receiver in fiber optics communications ∙ a. APD ∙ b. Tunnel diode ∙ c. Laser diode ∙ d. LED
Description : Draw the characteristics of tunnel diode and write two applications of it.
Last Answer : Characteristics: Applications: 1. In the digital networks 2. As a high speed switch 3. As a high frequency oscillator 4. High speed computers
Description : Draw the characteristics of tunnel diode, showing operating regions. State two applications of tunnel diode.
Last Answer : Applications: One of the important application of a tunnel diode is in high speed computers where the switching times in the order of nanoseconds or picoseconds are desirable. A tunnel diode can be ... In digital networks. 2. As a high speed switch. 3. As a high frequency oscillator.
Description : Draw symbol of (i) Tunnel diode (ii) LED
Last Answer : (i) Tunnel diode: (ii) LED:
Description : Draw VI characteristics of Tunnel diode & describe it.
Last Answer : Symbol of TUNNEL DIODE operating principle of tunnel diode Working The operation of tunnel diode is based on special characteristics known as negative resistance. The width of the ... tunneling & hence the name of the high impurity density PN junction is called as tunnel diode.
Description : Sketch the construction of tunnel diode and write its operation.
Last Answer : Construction: Applications: • In digital networks. • As a high speed switch. • As a high frequency oscillator. • As a logic memory storage device. • In relaxation oscillator circuits.
Description : Which of the following is used for regulated electric supply ? (1) Zener diode (2) Junction diode (3) Gun diode (4) Tunnel diode
Last Answer : Zener diode
Description : What is the use of Tunnel diode ?
Last Answer : Tunnel diode is use in frequency converters and detectors, ultra high speed switching, amplifiers, etc.
Description : Which of the following properties distinguish a material as conductor, insulator and semiconductor? a) Free electron charges b) Fermi level after doping c) Energy band gap d) Electron density
Last Answer : c) Energy band gap
Description : What is the doping level of an avalanche effect diode when compared to the doping level of a Zener-effect diode?
Last Answer : The doping level of an avalanche effect diode is lower.
Description : A power diode has lightly doped n type substrate sandwiched between heavily doped p and n regions (a) to increase reverse breakdown voltage (b) to reduce ohmic loss under forward bias (c) to decrease switching time of the power diode (d) to improve transient behaviour of the diode
Last Answer : A power diode has lightly doped n type substrate sandwiched between heavily doped p and n regions to improve transient behaviour of the diode
Description : During avalanche effect breakdown, what limits current flow through the diode?
Last Answer : an external current-limiting resistor
Description : During the manufacture of a point-contact diode, what is the purpose of passing a relatively large current from the catwhisker to the silicon crystal?
Last Answer : . To form a small region of p-type material
Description : How does the current-diode detector differ from the voltage-diode detector?
Last Answer : The current-diode detector is in parallel with the input and load.
Description : What resistance property is found in tunnel diodes but not in normal diodes?
Last Answer : Negative resistance.
Description : What is the main difference in construction between normal PN junction diodes and tunnel diodes?
Last Answer : The amount of doping.
Description : What causes the negative-resistance property of tunnel diodes?
Last Answer : The tunneling action
Description : What causes dc bias energy to be absorbed by avalanche electrons and given up to the microwave field applied to an avalanche transit-time diode?
Last Answer : The negative-resistance property.
Description : The waveform of a certain signal can be studied by – (1) Spectrometer (2) Cathode ray oscilloscope (3) p - n junction diode (4) Sonometer
Last Answer : (4) Sonometer Explanation: A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display ... electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
Description : In a semiconductor diode, p-side is earthed and to n-side is applied a potential of -2 volt; the diode shall (a) Conduct (b) Not conduct (c) Conduct partially (d) Break down
Last Answer : a) Conduct
Description : Which is the most important building block of electronic devices? (a) Diode (b) p-n junction (c) transistor (d) rectifier
Last Answer : b) p-n junction
Description : List four specifications of zener diode or P- N junction diode.
Last 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.
Last 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 and explain V-I characteristics of a P-N junction diode.
Last Answer : V-I Characteristics of a P-N junction: V-I characteristics of a Diode: The V-I characteristics can be divided in two parts. 1. Forward characteristics. 2. Reverse ... plot a graph with reverse voltage on horizontal axis and current on vertical axis, we obtain reverse characteristics.
Description : Compare P-N junction and Zener Diode.
Last 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