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Q. Explain Read-only memory?
ROM is nonvolatile (because it maintains its contents even when its power is shut off) and is used to store data and programs that do not change during the operation of the system. The mask-programmed ROMs are read-only devices that are programmed for data storage during the manufacturing of the chip itself. These are generally less expensive devices for mass production. Character-font memory for laser printers is a good example. Programmable read-only memory (PROM) is a field-programmable memory that is fabricated by the manufacturer containing all 0s and is programmed irreversibly by the user by electrically changing appropriate 0s to 1s. PROMs are quite economical in small quantities. Erasable programmable read-only memory (EPROM) is nonvolatile and widely used in microprocessor systems for program storage. It can be erased by shining an ultraviolet light and reprogrammed if necessary. These are produced in lowtomoderate volumes.
Q. Let m 1 (t) and m 2 (t) be two message signals, and let u 1 (t) and u 2 (t) be the corresponding modulated versions. (a) When the combined message signal m 1 (t) + m 2 (t) DS
An induction motor takes 350 kW at 0.8 power factor lagging while driving a load. When an overexcited synchronous motor taking 150 kW is connected in parallel with the induction mo
High Level Language ( third Generation Language ) The difficulties of low level languages are overcome by high level languages. In assembly language mnemonics were used
Q. A particular BJT has a nominal value of α 0.99. Calculate the nominal β.If α can easily change ±1%, compute the percentage changes that can occur in β.
explian briefly with in diagram and numerical examples
Dielectric: Insulator that is used among the two plates of a capacitance is called as dielectric. Electric field exists in the dielectric and the flux density depends on th
Define The universal property of NAND and NOR Gates? The NAND and NOR gates are called universal gates, because any gate can build by using these two gates. The univers
1. The circuit below will be most efficiently analyzed by obtaining the Thevenin equivalent circuit for the circuit to the left of the points (a-b) on the schematic. The capacitor
Q. A transmission line with air dielectric is 25 m long. Find, in wavelengths, how long the line is at frequencies of 1 kHz, 10 MHz, and 100 MHz.
Define Shunt VAr Compensation? Shunt capacitors absorb leading VArs (i.e. they are used to supply lagging VArs) whereas reactors are used to absorbs lagging VArs. Capacitors an
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