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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.
Q. Describe the time division switching? Ans: Space and Time Switching: Space Switches: Connections can be made between outgoing and incoming PCM highways by means of
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hi I want the code of digital modulation in matlab with inputs binary bit stream and M-ar
Followings are the Disadvantages of PLC a.Too much work required in connecting wires. b.Difficulty with changes or replacements. c.Difficulty in finding errors requi
Load Balancing and Load Management It has been observed in which the load on all three phases of a distribution line and between the feeders is not balanced. This output in in
How much would it cost for the following?
You are asked to design a circuit that indicates if a 12 V battery has been connected the correct way around to two terminals, A and B. To do this, you have chosen to use a special
A common-collector (CC) amplifier is also known as an emitter follower (or a voltage follower) due to the fact that the output voltage "follows" the input by being approximately eq
The aim of this project is to design, construct and build a motorised base driven by two small dc motors. The motor drives are two H-bridges. The switching devices in these bridges
Q. How oscillations start up in an oscillator? The noise voltage produced due to the random motion of electrons in resistors or in active devices provides the starting voltage
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