Match the various types of ROM with their descriptions.                                                                        MROM                                                                        PROM                                                                        EPROM                                                                        EEPROM                                                                        flash memory A. need UV light to erase B. can erase individual cells C. user can program once only D. entire device is erased instantly E. programmed during manufacture

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.