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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.
Define Multiple Inputs - Control System When there is much more than one input to a system, the superposition principle can be employed. This is that: The response to variou
define the physical significance of damping coefficient
Bipolar junction transistor: Transistors are so named as they conduct via using both majority and minority carriers. The bipolar junction transistor that is abbreviated as BJT
Q A wire with n = 10 30 electrons/m 3 has an area of cross section A = 1mm 2 and carries a current i = 50 mA. Compute the number of electrons that pass a given point in 1 s, and
Q. A four-pole dc machine with 728 active conductors and 30mWb flux per pole runs at 1800 r/min. (a) If the armature winding is lap wound, find the voltage induced in the armatu
A former employs a servant to look after his form house. He instructs the servant to keep a watch on his goat. So that he does not harm the kitchen garden, when the entrance-door
What we have seen for practical power supplies applies to any electrical circuit provided it contains only linear components
Q. (a) Determine the Thévenin and Norton equivalent circuits as viewed by the load resistance R in the network of Figure. (b) Find the value of R if the power dissipated by R is
Most ac generators used in Power Stations are of the " Flux Cutting " types. Their effiencies range from less than 33% to slightly more than 60%. In their efficiency equations, the
Properties of Conductors and Insulators: This unit provides the basic characteristics or properties of the most common materials which are classified as semiconductor, conduct
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