Description : What causes diodes to fail in alternator?
Last Answer : alternator
Description : Do Zener diodes have polarity?
Last 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 : The use of four diodes, in a full-wave bridge rectifier circuit, will __________. A. provide unidirectional current to the load B. allow a very high leakage current from the load C. convert direct current to alternating current D. offer high opposition to current in two directions
Last Answer : Answer: A
Description : Mention the different types of diodes and one use of each.
Last Answer : a) Light Emitting Diode (LED): They are used in lighting, display units of electric and electronic devices. b) Zener diode: It is used in voltage stabilizers. c) Photodiode: It is used in light sensitive semiconductors. d) Laser diode: It is used in fiber optical fibre communications.
Description : which of the following accurately describes junction diodes? -General Knowledge
Last Answer : A semiconductor rectifying device in which the barrier between the two regions of opposite conductivity (n-type and p-type) type produces the rectification: accurately describes junction diodes.
Description : How many types of diodes ?
Last Answer : 2 types of diodes
Description : Are diodes polarity sensitive?
Last Answer : Need answer
Description : For which one of the following, 'Diodes' are generally used for? (1) Rectification (2) Amplification (3) Modulation (4) Filtration
Last Answer : (1) Rectification Explanation: In electronics, a diode is an electronic device that allows current to flow in one direction only. It is mainly used as a rectifier diode that lets ... used for power supply operation. Rectifier diodes are used for changing alternating current into direct current.
Description : For which one of the following, "Diodes' are generally used for? (1) Rectification (2) Amplification (3) Modulation (4) Filtration
Last Answer : (1) Rectification Explanation: A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
Description : Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit (1) X-rays (2) ultraviolet light (3) (4) All of the above (4) radio waves
Last Answer : (4) All of the above Explanation: A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics.
Description : A NOT gate can be implemented by: (1) a single diode (2) two diodes (3) a single resistor (4) a single transistor
Last Answer : (4) a single transistor Explanation: In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite ... be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
Description : In the illustrated circuit, if the input to leads 'B' and 'Y' was 24 VDC the output between 'A' and 'X' will be _________. EL-0069 A. 24 VDC B. 22.8 VDC, 24 VDC minus the 1.2 VDC voltage drop across two diodes C. undeterminable without knowing the turns ratio of the transformer D. 0 VDC
Last Answer : Answer: D
Description : Routine maintenance of a ship's service alternator should include ______________. A. changing the pedestal bearing insulation yearly B. megger testing of all rectifying diodes C. lubricating excitation slip rings D. periodic cleaning of the air filters or screens
Description : Which of the devices listed is indicated by the symbols lettered 'A' to 'F', shown in the illustration? EL-0016 A. Diodes B. Linear inductors C. Capacitors D. Transistors
Description : High vacuum diodes, gas-filled diodes, and germanium semiconductor diodes may all be used as _____________. A. potentiometers B. rectifiers C. power sources D. photocells
Last Answer : Answer: B
Description : Silicon diodes designed for a specific reverse breakdown voltage, become useful as an electronic power supply voltage regulator, called _____________. A. tunnel diodes B. hot-carrier diodes C. compensating diodes D. Zener diodes
Description : Heat sinks are frequently used with _____________. A. power transistors B. vacuum tubes C. tunnel rectifier diodes D. all of the above
Description : What types of inverters require feedback diodes?
Last Answer : VSI with RL load.
Description : Why diodes should be connected in antiparallel with the thyristors in inverter circuits?
Last Answer : For RL loads, load current will not be in phase with load voltage and the diodes connected in antiparallel will allow the current to flow when the main thyristors are turned off. These diodes are called feedback diodes.
Description : What are the advantages of freewheeling diodes in a controlled in a controlled rectifier?
Last Answer : a. Input power factor is improved. b. Load current waveform is improved and thus the load performance is better.
Description : What is the function of freewheeling diodes in controlled rectifier?
Last Answer : It serves two process. a. It prevents the output voltage from becoming negative. b. The load current is transferred from the main thyristors to the freewheeling diode, thereby allowing all of its thyristors to regain their blocking states.
Description : Vacuum tubes have been replaced by-----? A. Conductors B. Diodes C. Transistors (Answer) D. None of these
Last Answer : C. Transistors (Answer)
Description : Define semiconductor diodes.
Last Answer : It is a device in which electric current can flow in one direction. It has 2 terminals P and N.
Description : Current limited power supplies can prevent damage to A) Rectifier diodes and power transformers. B) Pass transistors C) Other circuits in the system D) All of the above.
Last Answer : D) All of the above.
Description : What type of logic family uses diodes in the input?
Last Answer : DTL (diode transistor logic).
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 : Specify the mechanism that SLDs lack that is required by laser diodes to achieve lasing.
Last Answer : SLDs have no built-in optical feedback mechanism.
Description : Why are LEDs preferred over laser diodes for low- and moderate-frequency analog applications?
Last Answer : LEDs require less complex circuitry than lasers.
Description : What causes the negative-resistance property of tunnel diodes?
Last Answer : The tunneling action
Description : For laser diodes, the term ____________________ is used instead of bandwidth.
Last Answer : linewidth
Description : Germanium diodes are used in AM detectors because ___
Last Answer : they minimize distortion from nonlinearit
Description : The number of diodes used in bridge rectifier circuit is (a) 4 (b) 3 (c) 2 (d)
Last Answer : (a) 4
Description : Pure semiconductors silicon and germanium are a) Extrinsic b) Intrinsic c) Insulator d) Diodes
Last Answer : b) Intrinsic
Description : For which one of the following, ‘Diodes’ are generally used for? (1) Rectification (2) Amplification (3) Modulation (4) Filtration
Last Answer : Rectification
Last Answer : a single transistor
Description : Draw the circuit diagram for AND and OR gates using diodes.
Last Answer : Diode AND gate :Diode OR gate :
Description : The light emitted diodes consist of: (1) Si (2) GaAs (3) Ge (4) Diamond
Last Answer : The light emitted diodes consist of: GaAs
Description : In a 3-phase voltage source inverter used for speed control of induction motor, anti-parallel diodes are used across each switching device. The main purpose of diodes is to:
Last Answer : In a 3-phase voltage source inverter used for speed control of induction motor, anti-parallel diodes are used across each switching device. The main purpose of diodes is to: Allow the motor to return energy during regeneration
Description : A voltage signal 10 Sinwt is applied to the circuit with ideal diodes, as shown in figure. The maximum and minimum values of the output waveform vout of the circuit are respectively
Last Answer : A voltage signal 10 Sinwt is applied to the circuit with ideal diodes, as shown in figure. The maximum and minimum values of the output waveform vout of the circuit are respectively +4V and-7V
Description : Assume that D1 and D2 in figure are ideal diodes. The value of current I is A)0mA B) 0.25mA C) 0.5 mA D)1.0mA
Last Answer : Assume that D1 and D2 in figure are ideal diodes. The value of current I is 0mA
Description : Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are ... vertically oriented structure supports large blocking voltages. Which of the above statements is/are correct ?
Last Answer : Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are less due to ... large blocking voltages. Which of the above statements is/are correct ? 2 only
Description : Which of the following diodes is limited to the reverse-bias region in its region of operation? (1) Schottky (2) Tunnel (3) Photodiode (4) Rectifier
Last Answer : Photodiode is limited to the reverse-bias region in its region of operation.
Description : In which region is the operating point stable in tunnel diodes? (1) Negative-resistance (2) Positive-resistance (3) Both negative- and positive-resistance (4) Neither negative- nor positive-resistance
Last Answer : In Negative-resistance region is the operating point stable in tunnel diodes.
Last Answer : Bridge rectifier requires four diodes
Description : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as
Last Answer : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as non-linear circuit.