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Higher Study | Electronic Devices | Optical Devices

Swept-out voltage in PIN diode happens when the PIN diode is
Assertion (A): A p-n junction diode with low junction depth can be used as a solar cell when illuminated by suitable light (wavelength) at the top thin layer above the junction. Reason (R): A p-n junction diode under no condition can be used as a solar cell. It can be used only as a light-emitting diode for optoelectronic applications.
When the light increases, the reverse current in a photo-diode
Which of the following statements about LED is INCORRECT?
The device which is used for detecting light intensity is
Which metal is used for making solar cell?
Consider the following statements regarding optocouplers: 1. Optocouplers are LEDs driving photodiodes in a single package to provide electrical isolation between input and output 2. Optocoupler is an LED driving a phototransistor in a single package that replaces pulse transformers working at input zero crossing 3. Optocouplers are used as temporary non-fixed joints between optical fiber terminations. Which of the above statements are correct?
Which computer application scans texts and converts into readable form in computer?
1. The pin diode consists of two narrow, but highly doped, semiconductor regions separated by a thicker, lightly doped material called the intrinsic region. 2. Silicon is used most often for its power-handling capability and because it provides a highly resistive intrinsic region. 3. The pin diode acts as an ordinary diode at frequencies above 100 MHz. Which of the above statements are correct?
Which of the following materials is used in light-emitting diodes?
Which of the following sensors is used to measure the change in light quantity caused by the target crossing the optical axis?
Which one of the following instruments is useful while measuring the optical power as a function of wavelength?
Consider the following statements: (a) LASER diode generates monochromatic coherent light which reduces chromatic dispersion (b) LASER source is useful for high power long-distance optical communication (c) LASERs have longer lifetime than LEDs (d) LASER diodes are less temperature-sensitive than LEDs Which of the above statements are correct?
Which of the following statements are true - I. Negative resists on exposure of light becomes more soluble. II. Positive resists on exposure of light becomes more soluble. III. Chrome glass is used as mask for pattern printing.
Identify the diode for which the above symbol is used.
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