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second generation 1954- 1964after the invention of semiconductor devices mainly transistors size of computer s was reduced a lot computing power
first generation 1946- 1654in the first generation computer vacuum tubes and valves were used these computer were very large in size
history of computersto understand the invention of microprocessor we have to see the history of computer first the growth the
normal 0 false false false en-in x-none x-none
application of plca a plc is used to start and stop the motors of a segmented conveyor beli this allows only belt section
the input output systemthe input output system provides the physical connection between the equipment and the plc there are
the central processing unit the central processing unit is the brain of whole plc the cpu consist of a microprocessor memory
components of plc there are followings three main components of plc athe power supply and rackbthe central processing unit cpucthe
followings are the disadvantages of plcatoo much work required in connecting wiresbdifficulty with changes or replacementscdifficulty in
there are many advantages of plc athe plc was specifically designed for harsh conditions with electrical noise magnetic fields
plc programmable logical controller plc stand for programmable logical controller plc is an industrial computer used
comparison of induction and dielectric heating after studying the induction and dielectric heating followings points may
effect of supply voltage aas the applied as voltage is increased hysteresis loss increasesbeddy current losses are given byw e alpha f2
effect of frequency afrom equation for given h p and mup v alpha radicfbfrom equation the depth of penetration for a given materialdelta
merits and demerits of stepper motor followings are the merits and demerits of stepper motorsmerits athey are compatible with
dc link scherbius drivethis type of scheme is shown in figure this circuit allows both sub synchronous and super synchronous speed
static scherbius drive by using this scheme below and above synchronous speed can be obtained for an induction motor there are
static rotor resistance control methods this method is used only for slip ring induction motor in srim 3- phase variable resistor can
stator current control methods the torque and speed of an induction motor can be controlled by the stator current
voltage and frequency control methods in this control method the ratio of voltage to frequency is kept constant so that the
stator voltage control methods by controlling the applied voltage the speed of an induction motor can be controlled
speed control of three phase induction motors three phase induction motors are invariably used in the application where in speed
performance equations of three phase induction motor when balanced 3- voltages are applied to the stator winding a rotating magnetic
three phase induction motorsa three phase induction rotor consists a stators and a motor stator has balanced three phase
regenerative braking control in this methods motor behaves like a generator and the kinetic energy of the motor and