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Q. Explain about Direct-current machines?
Generally speaking, conventional dc generators are becoming obsolete and increasingly often are being replaced by solid-state rectifiers in most applications for which an ac supply is available. The same is not true for dc motors. The torque-speed characteristics of dc motors are what makes them extremely valuable in many industrial applications. The significant features of the dc drives include adjustable motor speed over wide ranges, constant mechanical power output or torque, rapid acceleration or deceleration, and responsiveness to feedback signals.
The dc commutator machines are built in a wide range of sizes, from small control devices with a 1-W power rating up to the enormous motors of 10,000 hp or more used in rolling-mill applications. The dcmachines today are principally applied as industrial drivemotors, particularly when high degrees of flexibility in controlling speed and torque are required. Such motors are used in steel and aluminumrollingmills, tractionmotors, overhead cranes, forklift trucks, electric trains, and golf carts.Commutatormachines are also used in portable tools supplied frombatteries, in automobiles as starter motors, in blower motors, and in control applications as actuators and speed-sensing or position-sensing devices.
Give the applications of steel. Steel : It contains iron with a small percentage of carbon added to this. Iron itself is not extremely strong but while carbon is added this as
hello... i want to design a 1 to 8 demux with 4bit inputs and output. but i dont know the architecture in gate level. please help me... in fact, i need the architecture in gate lev
Q. In The Drain Characteristics Of FET What Does The Region At Pinch Off? Field Effect Transistors (FETs) utilize a conductive channel whose resistance is controlled by an appl
The focal length of a concave spherical mirror is equal to 1 meter. What is the radius of curvature of this mirror? Ans: The radius of curvature of this mirror is 2 meter.
Time constant Time constant, defines as time for current achieve maximum (IM) if this maintain the early promotion rate current.
Now that you have the input and output impedances you can design the matching networks. I will require either the Smith Charts showing how you calculated the matching components or
comment instruction for LIST p=18f4550
Write a short note on dispersion shifted and dispersion flatted fibers? The dispersion features of a fiber is display below: The overall dispersion is the sum of materi
Role of Central and State Governments The subsequent roles of Central and State Governments are envisaged in the Act: The Central Government will Notify rules
give the expression
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