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what are the basic modes of operation of 8255there are two basic modes of operation of 8255 viz1 io mode3 bsr modein io mode the 8255 ports work as
q how to define automatic float operated gaugesin recording type gauges automatic float operated gauges are more common the well for the float
what are the functional types used in control words of 8251athe control words of 8251a are divided into two functional types1 mode instruction
q can you explain pneumatic gaugespneumatic gauges permit reading or recording water level at some distance from the river say up to about 305 m in a
what is asynchronous data transferit is a data transfer method which is used when the speed of an io device does not match with the speed of the
what is synchronous data transferit is a data method which is used when the io device and the microprocessor match in speed to transfer a data to or
q describe about chain-wire and tape gaugeschain wire and tape gauges are fixed on structures like bridges and the weight is lowered to touch the
what are the different types of methods used for data transmissionthe data transmission among two points involves unidirectional or bi-directional
q what is crest gauges explainin case of bridges it is sometimes necessary to observe high flood levels rather than daily gauges to ensure that
q what do you mean by velocity - area methodout of the above four categories velocity area method is most widely used and provides more accurate
q how can you determine velocity by electromagnetic methodin electromagnetic method a magnetic field is generated by the electric current flowing
q what do you mean by dilution methoddilution methods are more suited especially in hilly streams and torrents where current meter measurements are
q define the moving boat methodmoving boat method has been more recently evolved and tested in the usa and holds promise in measurement of discharge
q what do you mean by stage discharge relationshipregular recording of discharges over a period of time is essential for estimation of water
q describe the slope - area methodin the event of infeasibility of velocity area method on account of either rapid rise or fall of floods or lack of
what are cu and neu in 8087cu-control unitneu- numeric extension unit the numeric extension unit implements all the numeric processor instructions
explain numeric processor 8087numeric processor 8087 is a coprocessor which has been intended to work under the control of the processor 8086 and
what is meant by pollingin polling schemes a set of address lines is driven by the controller to address every of the masters in sequence when a bus
what is independent bus request schemeeach of the masters needs a pair of request and grant pins which are connected to the controlling logic the
what is meant by daisy chaining method it does not need any priority resolving network rather the priorities of all the devices are effectively
write some disadvantages of loosely coupled systemsmore complicated due to the needed additional communication hardwarethey are less portable and
what are loosely coupled systemsin loosely coupled systems every cpu may have its own bus control logic the bus arbitration is handled by an external
what are tightly coupled systems or closely coupled systemsin a tightly coupled systems the microprocessor either coprocessor or independent
what are proceduresprocedures are a group of instructions stored as a separate program in memory and it is known from the main program whenever
what are macrosmacro is a group of instruction the macro assembler makes the code in the program each time where the macro is called macros are